KR20110067534A - Optical assembly, backlight unit having the same, and display apparatus thereof - Google Patents

Abstract

PURPOSE: An optical assembly of a backlight unit and a display apparatus thereof are provided to improve the contrast of a display image by using a partial driving method such as a local dimming or an impulsive. CONSTITUTION: An optical assembly of a backlight unit comprises a substrate(250), a plurality of light sources(13) which emits light to a first direction, a light entrance unit including a light incident plane, a light guide plate(15) including an light projecting unit which is connected with the light entrance unit, and a reflection member in which some parts are overlapped with the light guide plate.

Description

Optical assembly, backlight unit having the same, and display apparatus

The present invention relates to a backlight unit and a display device including the same.

As the information society develops, the demand for display devices is increasing in various forms, and in recent years, liquid crystal display devices (LCDs), plasma display panels (PDPs), electro luminescent displays (ELDs), and vacuum fluorescents (VFDs) have been developed. Various display devices such as displays have been studied and used.

Among them, the liquid crystal panel of the LCD includes a liquid crystal layer and a TFT substrate and a color filter substrate facing each other with the liquid crystal layer interposed therebetween, and have no self-luminous power to display an image using light provided from the backlight unit. can do.

An object of the present invention is to provide a backlight unit and a display device using the same that can improve the image quality of the display image.

An optical assembly according to an aspect of the present embodiment, a substrate; A plurality of light sources arranged on the substrate and emitting light with a predetermined direction angle with respect to a first direction; A light incident part including an incident surface from which the light is incident from the plurality of light sources in a first direction; and light emitted from the incident light in a second direction crossing the first direction and having one side connected to the light incident part A light guide plate including a portion; And a reflection member including a reflection area overlapping the light guide plate and an extension area not overlapping the light guide plate.

According to another aspect of the present embodiment, an optical assembly includes a substrate; A plurality of light sources arranged on the substrate and emitting light with a predetermined direction angle with respect to a first direction; A light incident part including an incident surface from which the light is incident from the plurality of light sources in a first direction; and light emitted from the incident light in a second direction crossing the first direction and having one side connected to the light incident part A light guide plate including a portion; And a reflective member including a first region overlapping the light guide plate and a second region not overlapping the light guide plate.

In one embodiment, a backlight unit includes a bottom cover; A substrate accommodated in the bottom cover; A plurality of light sources arranged on the substrate and emitting light with a predetermined direction angle with respect to a first direction; A light incident part including an incident surface from which the light is incident from the plurality of light sources in a first direction; and light emitted from the incident light in a second direction crossing the first direction and having one side connected to the light incident part A plurality of light guide plates comprising a portion; At least one reflective member including a reflection region overlapping with any one of the light guide plates and an extension region not overlapping the light guide plate; And an optical sheet disposed above the light guide plate.

According to another aspect of the present embodiment, a backlight unit includes one or more optical sheets; A plurality of optical assemblies located below the optical sheet; And a bottom cover on which the plurality of optical assemblies are received, to which the optical sheet is fixed, wherein the optical assembly comprises: a substrate; A plurality of light sources arranged on the substrate and emitting light with a predetermined direction angle with respect to a first direction; A light incident part including an incident surface from which the light is incident from the plurality of light sources in a first direction; and light emitted from the incident light in a second direction crossing the first direction and having one side connected to the light incident part At least one light guide plate comprising a portion; A reflecting member provided below the light guide plate and including a reflection area overlapping the light guide plate and an extension area not overlapping the light guide plate, and any of the light guide plates provided in any one of the optical assemblies. One edge is spaced apart by a predetermined distance from any one edge of the light guide plate provided in another adjacent optical assembly, and at least one of the extension area of the reflective member provided in any one of the optical assemblies. A portion is located at said spacing intervals, and another portion overlaps at least a portion of said reflective member of another adjacent optical assembly.

A display device according to an aspect of the present embodiment includes a display panel; A backlight unit positioned on a rear surface of the display panel, divided into a plurality of blocks, and the plurality of blocks individually driven; A driving unit provided behind the backlight unit and driving the display panel and / or the backlight unit, wherein the backlight unit comprises: a bottom cover; A substrate accommodated in the bottom cover; A plurality of light sources arranged on the substrate and emitting light with a predetermined direction angle with respect to a first direction; A light incident part including an incident surface from which the light is incident from the plurality of light sources in a first direction; and light emitted from the incident light in a second direction crossing the first direction and having one side connected to the light incident part A plurality of light guide plates comprising a portion; At least one reflective member including a reflection region overlapping with any one of the light guide plates and an extension region not overlapping the light guide plate; And an optical sheet disposed on an upper side of the light guide plate.

According to the proposed embodiment, by providing light to the display panel by using a modular backlight unit composed of a plurality of light guide plates, local dimming or impulsive at the same time to reduce the thickness of the display device The contrast of the display image may be improved by using a partial driving method such as).

In addition, as the reflective member of any one optical assembly overlaps at least a portion of the other reflective member, there is an advantage in that it can be continuously reflected with uniform light emitted from the plurality of optical assemblies.

Hereinafter, with reference to the accompanying drawings as follows. Hereinafter, the embodiments may be modified in various forms, and the technical scope of the embodiments is not limited to the embodiments described below. The examples are provided to more fully illustrate those skilled in the art. Accordingly, the shape and size of elements in the drawings may be exaggerated for clarity.

1 is an exploded perspective view showing the configuration of a display device according to a first embodiment of the present invention.

Referring to FIG. 1, the display device 1 according to the present embodiment includes a display module 200, a front cover 300 and a back cover 400 surrounding the display module 200, and a display module 200. It includes a fixing member 500 for fixing to the front cover 300 and / or back cover 400.

One side of the fixing member 500 is fixed to the front cover 300 by a fastening member such as a screw, and then the other side supports the display module 200 with respect to the front cover 300 side, the front cover 300 ) May be fixed to the display module 200.

In this embodiment, the fixing member 500 is described as being formed in a plate shape extending in one direction as an example, but the separate fixing member 500 is not provided, and the display module 200 is provided by the fastening member. It will be said that the configuration fixed to the front cover 300 or the back cover 400 is also possible.

FIG. 2 is a cross-sectional view illustrating a display module configuration according to the A-A diagram of FIG. 1.

Referring to FIG. 2, the display module 200 forms a display panel 210 on which an image is displayed, a backlight unit 100 that provides light to the display panel 210, and a lower exterior of the display module 200. The bottom cover 110, the panel supporter 240 supporting the display panel 210 from the lower side, and the top cover 230 supporting the display panel 210 from the upper side and forming an edge of the display module 200. ).

The bottom cover 110 may be formed in a box shape having an upper surface open to accommodate the backlight unit 100. One side of the bottom cover 110 may be fixed to one side of the top cover 230. For example, a fastening member such as a screw penetrates the side surface of the display module 200, that is, the side at which the bottom cover 110 and the top cover 230 overlap, and thus the bottom cover 110 and the top cover 230 are disposed. Can be fixed

The bottom cover 110 is provided with at least one substrate 250 for driving the display module 200 by a signal input from the outside, for example, a video signal.

The substrate 250 may be, for example, a driver of an image panel and / or a backlight unit, such as a timing controller (T-con board) or a main PCB, and the substrate 250 may be formed of the bottom cover 110. On the back side, for example, it may be fixed by a fastening member such as a screw or an adhesive member.

Although not shown in detail, the display panel 210 is, for example, a lower substrate 211 and an upper substrate 222 bonded to each other to maintain a uniform cell gap, and a liquid crystal layer interposed between the two substrates. It includes. A plurality of gate lines and a plurality of data lines intersecting the plurality of gate lines may be formed on the lower substrate 211, and a thin film transistor (TFT) may be formed at an intersection of the gate lines and the data lines. have.

Color filters may be formed on the upper substrate 212. The structure of the display panel 210 is not limited thereto, and the display panel 210 may have various structures. As another example, the lower substrate 211 may include not only a thin film transistor but also a color filter. In addition, the display panel 210 may be formed in various shapes according to a method of driving the liquid crystal layer.

Although not shown, a gate driving printed circuit board (PCB) for supplying a scan signal to the gate line and a data driving printed circuit board (PCB) for supplying a data signal to the data line are provided at the edge of the display panel 210. It may be provided. Meanwhile, a polarizing film (not shown) may be disposed on at least one of the top and bottom of the display panel 210.

Meanwhile, the backlight unit 100 according to the present exemplary embodiment includes a plurality of optical assemblies 10 including a light source 13, a substrate 14, a light guide plate 15, a reflective member 17, and a fixing bracket 18, respectively. And an optical sheet 220 provided between the display panel 210 and the display panel 210.

The optical sheet 220 according to the present embodiment may be removed, but is not limited thereto. The optical sheet 220 may include a diffusion sheet (not shown) and / or a prism sheet (not shown).

The diffusion sheet evenly spreads the light emitted from the light guide plate, and the diffused light may be focused onto the display panel by the prism sheet. Here, the prism sheet may be selectively configured using a horizontal or / and vertical prism sheet, one or more roughness reinforcing films, and the like.

Type or number of optical sheets 220 may be added or deleted within the technical scope of the embodiment, but is not limited thereto.

On the other hand, a plurality of the optical assembly 10 is arranged, disposed below the display panel 210 and the optical sheet 220, and emits light upward to irradiate light to the display panel 210.

3 is a plan view briefly illustrating a configuration of a backlight unit.

Referring to FIG. 3, the backlight unit 100 may include, for example, a plurality of light guide plates 15 (N being 2 or more) in the first direction in the y-axis direction, and the backlight unit 100 may be formed. The plurality of light guide plates 15 (M is 2 or more) may be provided in a third direction which is an x-axis direction crossing the y-axis on a plane.

At this time, the light emitting portion 15a of one of the light guide plates 15 of the light guide plate 15 arranged in the first direction is disposed above the light incident portion 15 of the other light guide plate 15. At least two light guide plates 15 adjacent to each other in a first direction may partially overlap each other.

That is, the other end 156 of the light emitting portion 15a of the Kth light guide plate (K is any one of 1 to N-1) among the N light guide plates is the mouth of the K + 1th light guide plate. At least a portion of the at least two light guide plates 15 adjacent to each other and disposed above the light portion 15b may be provided to overlap each other.

In addition, the optical assemblies 10 adjacent to each other are disposed to be spaced apart from each other by a predetermined distance d4 and d6 to form a space having a predetermined size.

That is, the light emitting portions 15a of the two light guide plates 15 disposed in the first direction (y-axis direction), which are the central directions in which light is emitted from the light source 13, are adjacent to each other in the first direction. Spaced apart from each other at an interval d6.

In addition, the light guide plates 15 disposed in the third direction (x-axis direction) crossing the first direction and adjacent to each other are spaced apart from each other at a second spacing d4.

In this case, the plurality of first separation intervals d6 may be formed in a third direction (x-axis direction), and the plurality of second separation intervals d4 may be formed in a first direction (y-axis direction). The separation interval d6 and the second separation interval d4 intersect each other.

In the boundary portion between the optical assemblies 10 and the light guide plate 15 adjacent to each other in the above-described distances d4 and d6, a bright line or a dark line may appear in the region 60 corresponding to the boundary portion.

That is, as the distances d1 and d2 between the light guide plates 15 adjacent to each other become narrower, the amount of light emitted to the front through the boundary portion increases, so that in the region 60 corresponding to the boundary portions between the light guide plates 15, As the brightness of the light increases, the bright line may appear, and thus, the bright line may be visually exposed on the display screen.

That is, as the distances d1 and d2 between the light guide plates 15 adjacent to each other become wider, the amount of light emitted to the front through the boundary portion decreases, and thus, in the region 60 corresponding to the boundary portion between the light guide plates 15. As the luminance of light decreases, dark lines may appear.

Therefore, according to the exemplary embodiment of the present invention, the distances d1 and d2 between the light guide plates 15 adjacent to each other are in a numerical range in which no bright line or dark line appears at the boundary, that is, the first spaced distance d6 is, for example, 0.1. In a size between mm and 7 mm, the second spacing d4 may be formed in a size between 0.1 mm and 7 mm, for example.

In addition, at least a portion of the reflective member 17 of the light guide plate 15 of the two light guide plates 15 adjacent to each other is positioned in the spaced space, and an inner surface of the bottom cover 110 is formed through the spaced space. Exposure to the first direction (y-axis direction) is prevented.

Meanwhile, in the display device 1 according to the exemplary embodiment, three optical assemblies 10 are disposed in the first direction, and three optical assemblies 10 are disposed in the third direction. A backlight unit 100 that satisfies the light guide plate arrangement condition is described.

The optical assemblies 10 can be fabricated as independent assemblies and can be placed in close proximity to form a modular backlight unit. Such a modular backlight unit may provide light to the display panel 210 as a backlight means.

The backlight unit 100 may be driven by a full driving method or a partial driving method such as local dimming or impulsive. The driving method of the light emitting diode may be variously changed according to a circuit design, but is not limited thereto. As a result, the color contrast ratio is increased and the image of the bright and dark portions on the screen can be clearly expressed, thereby improving image quality.

That is, the backlight unit 100 is operated by being divided into a plurality of divided driving regions corresponding to the plurality of light guide plates 15, and the black portion of the image is luminance by linking the luminance of the divided driving regions with the luminance of the image signal. By reducing the brightness and increasing the brightness, brightness and contrast can be improved.

Meanwhile, an area of the display panel 210 corresponding to one optical assembly 10 or one light guide plate 15 may be divided into two or more blocks, and the display panel 210 and the backlight unit may be divided into blocks. Can be driven.

At this time, the light guide plate 15 of the optical assembly 10 of C1 to C3 is disposed in the central column C in the backlight unit 100, and the left and right columns L and R are centered around the central column C. The light guide plates 15 of L1 to L3 and the light guide plates 15 of R1 to R3 are disposed respectively.

In more detail, as described above, nine light guide plates 15 may be arranged in three rows and three columns in the backlight unit 100 according to the present exemplary embodiment. In addition, a reflecting member 17 is disposed below each of the light guide plates 15 so that light incident on the light guide plate 15 in the first direction may cross in the second direction (z-axis direction). Allow light to be emitted.

In this case, at least a portion of the reflective member 17 disposed on the light guide plate 15 of the optical assembly 10 of C1 to C3 disposed in the central column C may further extend toward the outer edge of the light guide plate 15. do. In addition, an extended portion of the reflective member 17 positioned on the center row C overlaps the reflective member 17 located on the left row L and the right row R side.

Hereinafter, the configuration of the optical assembly 10 will be described in detail.

4 is an exploded perspective view showing an optical assembly according to a first embodiment of the present invention,

Referring to FIG. 4, the plurality of optical assemblies 10 may be arranged at least partially fixed to the bottom cover 110. As described above, the light source 13, the substrate 14, and the light guide plate 15 are respectively described. ), A reflection member 17 and a fixing bracket 18 may be included.

The light source 13 may be provided in plural, and disposed on the side surface of the light guide plate 13 in the third direction (x-axis direction). Therefore, light emitted from the light source 13 is incident on the side surface of the light guide plate 13.

In this case, the light source 13 may include a light emitting diode (LED) or a plurality of light emitting diodes (LEDs).

The light emitting diode may be a side light emitting type for irradiating light to the side. It may be implemented as a colored LED emitting at least one of colors such as red, blue, and green, or an LED emitting yellow light by applying a yellow phosphor to the blue LED.

The light emitting diodes may be disposed on the substrate 14 and may be provided as light emitting diodes emitting light having a wavelength between 430 nm and 480 nm, and the light emitting diodes may emit light emitted from the light emitting diodes. The phosphor coated to pass therethrough may be provided.

The colored LED may include at least one of a red LED, a blue LED, and a green LED, and the arrangement and emission light of such a light emitting diode may be changed within the technical scope of the embodiment.

In addition, the light sources 13 according to the present exemplary embodiment emit light with a predetermined direction angle with respect to the first direction.

The plurality of light sources 13 are disposed in the substrate body 141 of the substrate 14 extending in a direction parallel to the third direction (x-axis direction), and the first direction y of the substrate body 141. Axially rearwardly centered position.

That is, the light source 13 is mounted on the rear region k2 based on the first direction of the substrate body 141, and the front region k1 is formed on the front side of the rear region k2, and the front region The size of k1 may be larger than that of the rear region k2.

This means that a predetermined size of support space in which the light guide plate 15 and the reflective member 17 can be supported must be secured in the front region k1, and the rear side can be secured only in a width in which the light source 13 can be mounted. As the size of the area k2 is reduced, the width of the bezel area of the display module in which the rear area k2 is located, that is, the width of the edge of the display module may be reduced, so that the width of the rear area k2 is reduced to a minimum. Because it must be.

In this case, the first direction (y-axis direction) may be referred to as a front-rear direction with respect to the light guide plate 15, and the third direction (x-axis direction) may be referred to as a left-right direction with respect to the light guide plate 15. In addition, in the front-rear direction, the front means a direction (+ y-axis direction) in which light is incident from the light source 13 to the light guide plate 15, and the rear means an opposite direction (-y-axis direction) of the front side.

The substrate body 141 may further include a through hole 142 through which the fastening member 51 passes.

The through hole 142 may be disposed between the plurality of light sources 13. For example, the through hole 142 may be disposed between the left and right sides of the substrate body 141 and the four light sources 13. It is formed in the center.

At this time, the fastening member 51 integrally penetrates through the fixing bracket 18, the reflective member 17, and the substrate 14 to match the configuration of the optical assembly 10, and at the same time, the optical assembly 10. To the bottom cover 110.

Meanwhile, the light guide plate 15 is made of a transparent material, and includes, for example, one of an acrylic resin series such as polymethyl metaacrylate (PMMA), polyethylene terephthlate (PET), polycarbonate (PC), and polyethylene naphthalate (PEN) resin. can do. The light guide plate 15 may be formed by an extrusion molding method.

The light guide plate 15 scatters the light incident from the light source 13 and guides the light to emit light upward.

In more detail, the light guide plate 15 is formed upward in the upward direction (z-axis direction), that is, the display panel 210 by refracting and scattering light incident from the light source 13 in front (y-axis direction), that is, side incident light. Direction, the bottom surface of the light guide plate 15 is formed to be inclined upward toward the front to efficiently emit light incident from the side upwards.

At least a portion of the bottom surface of the light guide plate 15 is seated and supported by the front region k1 of the substrate body 141.

In addition, the light guide plate 15 further includes a light incident part 15b on which an incident surface 151 facing the light source 13 is formed, and a light emitting part 15a extending forward from the light incident part 15b.

In this case, the rear side where the incident surface 151 is located in the light guide plate 15 may be referred to as one side of the light guide plate 15, and the front end 155 of the light guide plate 15 may be referred to as the other side of the light guide plate 15. .

A plurality of light incident on the light guide plate 15 through the incident surface 151 from the plurality of light sources 13 is synthesized into one light while passing through the light incident part 15b and diffused through the light emitting part 15a. As a result, the light guide plate 15 is discharged upward.

One side of the light emitting unit 15a is connected to the other side of the light receiving unit 15b, and the light synthesized by the light receiving unit 15b is emitted upward, that is, through the upper surface 153 of the light emitting unit 15a. do.

The vertical height h2 of the light emitting surface from which light is emitted from the light source 13 is substantially the same as or smaller than the vertical height h1 of the incident surface 151 of the light incident part 15b of the light guide plate 15. .

That is, when the height h2 of the light sources 13 is greater than the height h1 of the incident surface 151, a part of the light emitted from the light emitting surface (not shown) of the light sources 13 is the incident surface. It is possible to leak to the surroundings without being incident to 151.

In addition, since the light sources 13 have directivity angles of a predetermined angle formed at, for example, 90 degrees or more, and emit light, the height h1 of the incident surface 151 is equal to the height of the light sources 13. larger than h2).

However, when the height h1 of the incident surface 151 exceeds twice the height h2 of the light sources 13, the prevention of light leakage and the increase in light efficiency are no longer performed, but rather excessive diffusion. A decrease in light efficiency may occur.

Therefore, the height h1 of the incident surface 151 according to the present embodiment is formed to be equal to the height h2 of the light sources 13 or less than twice the height h2 of the light sources 13. do.

At this time, the light incident portion 15b extends by a predetermined distance d1 toward the first direction (y-axis direction), and the light emitting portion 15a is extended by a predetermined distance d2 toward the front from the light incident portion 15b. Is formed to extend further. Therefore, the front and rear lengths of the light guide plate including the light incident portion 15b and the light emitting portion 15a are formed by the size of d3, which is the sum of the front and rear extension lengths of the light incident portion 15b and the light emitting portion 15a.

At the point where the light incident portion 15b and the light emitting portion 15a are connected, a step is generated according to the difference between the height of the upper side 152 of the light incident portion 15b and the height of the upper side 153 of the light emitting portion 15a. Is formed.

At this time, at least a part of the fixing bracket 18 is in contact with the upper surface 152 of the light incident portion 15b, so that the upper surface 152 of the light incident portion 15b is lowered, that is, the substrate body 141 and By pressing toward the bottom cover 110, the light guide plate 15 may be firmly fixed to the bottom cover 110.

In addition, the step height h5 is formed to be the same as the height h4 of the other end 156 of the light emitting unit 15b or at least the same as the height h4 of the other end 156.

As described above, the bottom surface of the light guide plate 15 is formed to be inclined upward from the light incident part 15b to the light emitting part 15a.

Therefore, the thickness of the light emitting portion 15b is formed in a tendency to gradually decrease from the light incident portion 15b to the light emitting portion 15a.

When the height h4 of the other end 156 is formed to have a size exceeding the step height h1, as the angle at which the lower side of the light guide plate 15 is inclined becomes smaller, the reflectance is reduced, and The efficiency of emitting light upward from the light emitting portion 15a is reduced.

In addition, an optical interference phenomenon may occur in which light that is not emitted through the upper surface 158 of the light emitting unit 15a leaks to another light guide plate 15 adjacent to the other light guide plate 15 through the other end 156. Therefore, the height h4 of the other end 156 of the light emitting part 15a is smaller than or equal to the step height h5.

On the other hand, when the height h1 of the incident surface 151 is formed smaller than the step height h5, excessive light diffusion occurs in the process of the light traveling from the light incident part 15b to the light emitting part 15a. The darker portion than the surroundings is generated on one side of the light emitting portion 15a in contact with the light incident portion 15b. Therefore, the height h1 of the incident surface 151 is formed to be greater than or at least equal to the step height h5.

Further, the relationship between the height h1 of the incident surface 151 and the step height h5 and the relationship between the step height h5 and the height h4 of the other end 156 of the light emitting part 15a The height h1 of the incident surface 151 may be equal to the height h4 of the other end 154 or at least greater than the height h4 of the other end 154.

On the other hand, the vertical height h1 of the incident surface 151 of the light incident part 15b is smaller than the vertical height h3 of one end of the light emitting part 15a connected to the light incident part 15b.

The light emitting part having a larger cross-sectional area than the incident surface 151 in a state where a plurality of light incident from the plurality of light sources 13 into the light guide plate 15 are combined into one lights within the light incident part 15b. As the light proceeds to one end of 15a), the light is diffused to a larger area.

In addition, the vertical height h4 of the front end 155 of the light emitting part 15a is the vertical height h1 of the incident surface 151 of the light incident part 15b and the vertical direction of the one end of the light emitting part 15a. It is formed smaller than the directional height h3.

This is because the cross-sectional area of the light guide plate 15 in the up-down direction is reduced from the portion where the light incident through the incident surface 151 is emitted in the upward direction from the light guide plate 15, so that the divergence of the light is more smoothly upward. This can be done so that

On the other hand, the fixing bracket 18 for fixing the light guide plate 15 to the bottom cover 110 is provided at one side of the light guide plate 15, that is, the upper surface side of the light receiving part 15b, and at least the light guide plate 15 is provided. A part is pressed toward the bottom cover 110 to fix the light guide plate 15.

The fixing bracket 18 is provided with a frame structure bent at an upper side thereof, and may be formed of an injection molded material or a metal material by a synthetic resin. The bent upper side of the fixing bracket 18 is formed with a through hole 181 through which the fastening member 51 passes.

In addition, the fixing bracket 18 is fixed to the bottom cover 110 by the fastening member 51, and the light source 13 is provided in the internal space of the fixing bracket 18. Therefore, the light not passing through the light guide plate in the light source 13 can be prevented from being directly emitted to the outside.

2 to 4, at least an upper portion of the light guide plate 15 of the other optical assembly 10 adjacent to the optical assembly 10 above the fixing bracket 18 of any one of the optical assemblies 10. Some may be provided in an overlapped state.

That is, at the upper side of the fixing bracket 18 and the light receiving part 15b of any one optical assembly 10, at least a part of the light emitting part 15a of another adjacent optical assembly 10 is positioned so that each optical The assemblies 10 are provided in a state where they are overlapped with each other.

Meanwhile, the display panel 210 may have a plurality of divided regions corresponding to the plurality of light guide plates 15, and may be formed from the light guide plates of the optical assembly 10 corresponding to gray peak values or color coordinate signals of the divided regions. The brightness of the emitted light, that is, the brightness of the corresponding light source may be adjusted to adjust the brightness of the display panel 210.

Referring back to FIG. 4, the bottom surface of the light guide plate 15 is provided with a reflective member 17 for reflecting the light upward.

The reflective member 17 may be provided with a reflective sheet coated with a reflective material on at least one surface thereof and having a predetermined reflectance. In addition, the reflective member 17 is formed on the other side of the reflective region 171 and the reflective region 171 which faces the bottom surface of the light guide plate 15 and one side thereof contacts the other end 156 of the light guide plate 15. And a fixing area 173 for fixing the position at which the reflective member 17 is provided with respect to 14. In this case, the position where the fixed region 173 is formed in the reflective member 17 may be referred to as the rear edge of the reflective member 17, and the edge in the opposite direction of the rear edge is the front side of the reflective member 17. It can be called a border.

The extension length d7 of the reflective region 171 in the first direction (y-axis direction) is equal to the extension length d3 of the bottom surface in the first direction of the light guide plate 15, or the extension of the bottom surface. It is formed larger than the length d3.

In addition, the extension width w2 of the reflection region 171 in the third direction (x-axis direction) is the same as the extension width w1 of the light guide plate 15 in the third direction or of the light guide plate 15. It is formed larger than the extension width w1.

In FIG. 4, the extension length d7 and the extension width w2 of the reflective region 171 are described as being equal to the extension length d3 of the bottom surface and the extension width w1 of the light guide plate 15, respectively.

When the extension length d7 and the extension width w2 of the reflection area 171 are larger than the extension length d3 of the bottom surface and the extension width w1 of the light guide plate 15, the reflection area 171 is formed. The difference between the extension length (d7) and the extension length (d3) of the bottom surface and the difference between the extension width (w2) and the extension width (w1) of the light guide plate (15) are the first separation interval (d6) and the second separation interval, respectively It is formed smaller than (d4).

The fixed region 173 is formed at the other side of the reflective region 171, and is formed according to a position and a shape corresponding to the plurality of light sources 13 to insert the plurality of light sources 13 to reflect the substrate 14. A fixing hole 171 for maintaining the position of the 17 and a plurality of fixing holes 171 are provided, and includes a through hole 172 at a position corresponding to the through hole 142 of the substrate 14. do.

Meanwhile, in FIG. 4, the extension reflecting member 17a of the optical assembly 10 of the plurality of optical assemblies 10 disposed in the central column C is illustrated, and the extension reflecting member 17a is the reflection region 171. It further includes an extension area 172 formed on both left and right sides of the ().

The non-extended reflecting member 17b (see FIG. 6) is provided in the optical assembly 10 disposed in the other columns L and R except for the central column C. Unlike the extended reflecting member 17a, the extended reflecting member 17a does not include a separate extension region 172.

In this case, a reflective region 171 disposed below the light guide plate 15 and overlapping the light guide plate 15 may be referred to as a first region, and an extension region 172 not overlapping with the light guide plate 15 may be referred to as a second region. have.

Hereinafter, the configuration of the non-extending reflecting member 17b corresponding to the extending reflecting member 17a and the extending reflecting member 17a will be described in detail.

5 is a view showing an extended reflecting member according to a first embodiment of the present invention, Figure 6 is a view showing an unextended reflecting member according to a first embodiment of the present invention.

First, referring to FIG. 5, the extension reflecting member 17a further includes an extension region 172 as described above.

In more detail, in the extension reflecting member 17a according to the present embodiment, a pair of extension regions 172 is provided on the left and right sides of the reflection region 171, respectively.

In this case, the extension width w3 of the one extension region 172 in the third direction (x-axis direction) is formed to be greater than at least the second separation interval d4. In the present embodiment, for example, the extension width w3 may be formed in a size of 0.15 mm to 100 mm.

That is, in a state where the reflective region 171 of the extended reflecting member 17a is disposed on the bottom surface of the light guide plate 15, the extension of the reflective region 171 is performed on the left and right sides of the reflective region 171, that is, in the third direction (x-axis direction). The extended regions 172 extending further by the width w3 protrude from the edge of the light guide plate 15 toward the outside of the edge. In addition, the extension regions 172 are exposed in the second direction (y-axis direction) through the second separation interval d4.

As the extension width w3 in the third direction (x-axis direction) of the extension region 172 is greater than one second spacing d4, the extension reflection disposed in the central column C is provided. The extension regions 172 of the member 17a overlap at least part of the optical assembly 10 disposed in the left column L or the right column R of the central column C.

In this case, the extension length of the extension regions 172 extending in the first direction (y-axis direction) may be the same as the extension length of the reflection region 171 extending in the first direction.

In addition, the width of the extension reflecting member 172 in the third direction is the sum of the extension width w2 of the reflection area 171 and the extension width w3 of the left and right extension areas w3. It is formed in a size corresponding to.

Next, referring to FIG. 6, the non-extended reflecting member 17b according to the present exemplary embodiment does not include a separate extension region 172 unlike the extended reflecting member 17a as described above.

Accordingly, the width of the non-extending reflecting member 17b in the third direction is formed to be the same as the extension width w2 of the reflecting region 171, and the left and right edges of the non-extending reflecting member 17b are light guide plates. It may be disposed in contact with the left and right edges of the (15), or located in the second separation interval d4.

7 is a plan view illustrating a state in which an extension reflecting member according to a first embodiment of the present invention is mounted on a light guide plate and a substrate.

Referring to FIG. 7, with the extension reflecting member 17a mounted on the light guide plate 15 and the substrate 14, the reflective region 171 of the extension reflecting member 17a is positioned on the bottom surface of the light guide plate 15. It overlaps with the light guide plate 15.

In addition, the extension region 172 of the extension reflecting member 17a is further extended by a predetermined width w3 of a predetermined size in the outward direction of the light guide plate 15 based on the edge of the light guide plate 15. It is provided in a shape that does not overlap with.

Hereinafter, the configuration in which the extending reflecting member 17a and the non-extending reflecting member 17b are disposed to each other will be described in detail.

FIG. 8 is a cross-sectional view of the backlight unit taken along the line B-B of FIG. 3.

Referring to FIG. 8, an extension reflecting member 17a is provided on a bottom surface of the light guide plate 15 disposed at the C2 position among the light guide plates 15 arranged in the central column C, and the left column L and the right column ( An unextended reflecting member 17b is provided on the bottom surface of the light guide plate 15 disposed at the positions L2 and R2 among the light guide plates 15 disposed at R).

Accordingly, at least some of the extension regions 172 of the extension reflecting member 17a disposed on the bottom surface of the light guide plate 15 of C2 are reflected reflection regions 171 of the non-extended reflection member 17b disposed at the L2 and R2 positions. It is located below and overlaps with at least a part of the non-extending reflecting member 17b.

That is, at least some of the extension regions 172 are positioned below the light guide plate edges disposed at the L2 and R2 positions.

The remaining portions of the extension regions 172 are positioned at the second separation interval d4, so that light incident on the second separation interval d4 along the edge of the light guide plate 15 is incident in the second direction (y-axis direction). To be reflected).

In this case, a portion of the extended area 172 overlapping at least a portion of the other reflective member 17b that is adjacent to is called an overlapping area 1721, and another part of the extended area 172 that does not overlap with the other reflective member 17b. May be referred to as a non-overlapped region 1722.

The non-overlapping region 1722 is positioned at the second separation interval d4, and is exposed in the first direction (y-axis direction), and the overlapping region 1721 is disposed below the other reflecting member 17b. Is located.

Meanwhile, the extension regions 172 of the extension reflecting members 17a disposed in the center row C may be located below the optical assembly 10 disposed in the left row L and the right row R, First, the optical assembly 10 disposed in the center column C may be installed in the backlight unit 100, and then the optical assembly 10 disposed in the left column L or the right column R may be installed.

In the present exemplary embodiment, three optical assemblies 10 are disposed in the center column C, the left column L, and the right column R, respectively, but the optical assemblies are arranged in different numbers of columns and rows. The arrangement in which the 10 is disposed is also possible, and in this case, the arrangement in which the extending reflecting member 17a and the non-extending reflecting member 17b are arranged may also vary according to the arrangement of the optical assembly 10.

For example, when the optical assemblies 10 of the first to fourth rows are disposed in the third direction (x-axis direction) of the backlight unit 100, the extension reflecting member 17a includes one extension region 172. An extension reflecting member 17a is disposed in the optical assemblies 10 in the first to third rows so that the extension region 172 of one optical assembly 10 is the reflective region of the other optical assembly 10. Overlapping with 171, the configuration in which the non-extending reflective member 17b is disposed in the optical assembly 10 of the fourth row.

According to the proposed embodiment, by providing a light to the display panel using a modular backlight unit composed of a plurality of light guide plates, while reducing the thickness of the display device, local dimming or impulsive The contrast of the display image may be improved by using a partial driving method such as).

In addition, as the reflective member of any one optical assembly overlaps at least a portion of the other reflective member, there is an advantage in that it can be continuously reflected with uniform light emitted from the plurality of optical assemblies.

In addition, as at least some of the overlapping reflective members are positioned below the other reflective members, the mechanical interference between the mutual members is minimized, so that deformation between the reflective members can be minimized.

9 is a cross-sectional view illustrating a backlight unit according to a second embodiment of the present invention, FIG. 10 is a perspective view illustrating the light guide plate and the extension reflecting member of FIG. 9, and FIG. 11 is a reflecting member according to the second embodiment of the present invention. It is a top view showing.

In the configuration of the backlight unit illustrated in FIGS. 9 to 10, a description of the same configuration described with reference to FIGS. 1 to 8 will be omitted below.

9 and 10, the optical assembly 10 includes a light source 13, a light guide plate 15, a reflective member 17, and a side cover 20 for fixing the light source 13 and the light guide plate 15. It can be configured to include.

The side cover 20 provides a fixed position with respect to the bottom cover 110, is enclosed by a part of the light source 13 and the light guide plate 15, and the light source 13 is accommodated in an inner space.

The side cover 20 may include a first side cover 21 and a second side disposed below the light incident part 15b of the light source 13 and the light guide plate 15. It may include a cover 22. The side cover 20 may be made of plastic or metal.

The first side cover 21 and the second side cover 22 are fastened to each other by the first fixing member 51 so that the light source 13 and the light guide plate 15 are not shaken by an external impact, in particular in the first direction z Shake in the axial direction) can be prevented.

The second side cover 22 may support the inclined surface of the light guide plate 15 to maintain the alignment of the light guide plate 15 and the light source 13 firmly and to protect from external impact.

The light incident part 15b of the light guide plate 15 may include a protrusion 30 protruding at a predetermined height a. On the other hand, the projections 30 may be formed in at least two places in the third direction (x-axis direction) on the upper surface of the light incident portion 15b of the light guide plate 15.

The protrusion 30 may have various shapes, for example, may have a shape similar to a cuboid. The protrusion 30 can be prevented from shaking of the light guide plate 15 in the third direction and the first direction (x-axis and y-axis) by being caught by the first side cover 21.

Some of the corners 30a of the protrusions 30 may be rounded to prevent cracks in the protrusions due to the impact applied to the protrusions 30 by the movement of the light guide plate 15.

On the other hand, the projection 30 may have a height (a) of 0.3 ~ 0.6mm from the upper surface of the light incident portion (15b). The width b of the protrusion 30 in the third direction (x-axis direction) may be 2 to 5 mm. The width c in the first direction (y-axis direction) of the protrusion 30 may be 1 to 3 mm.

The projection 30 may be disposed between adjacent light emitting diodes 11, and the light generated in the light emitting diodes 11 may be formed in the upper surface of the light incident portion 15b to be close to the light incident surface 16. Due to the projections 30 formed integrally with the 15, it is possible to prevent the optical interference from occurring.

The light emitting diodes 11 may be arranged at predetermined intervals. The light emitting diode 11 may be disposed in an oblique direction with respect to the protrusion 30 in order to minimize the optical effect of the protrusion 30 formed on the light guide plate 15. Thus, the spacing of the light emitting diodes 11 around the protrusion 30 may be wider than the spacing of other light emitting diodes 11.

The light emitting diodes 11 may be provided to secure a space for coupling the first side cover 21 and the second side cover 22 and to minimize an optical effect that may be generated by the light guide plate 15 being pressed by the coupling force. The spacing of some of the light emitting diodes 11 may be wider than the spacing of other light emitting diodes 11.

Meanwhile, the first hole 41 may be formed in the first side cover 21 at a position corresponding to the protrusion 30 of the light incident part 15b.

The first hole 41 may be larger than the protrusion 30 so that the protrusion 30 is fitted into the hook. The circumference of the first hole 41 may be spaced apart from a predetermined edge of the fitted protrusion 30 by a predetermined distance, which is spaced apart from the light guide plate 15 when the light guide plate 15 is expanded by an external environment change, for example, a sudden temperature rise. It may be a margin for preventing deformation of 15. In this case, another portion of the protrusion 30 may contact the circumference of the first hole to strengthen the fixing force.

At least one second hole 42 may be further formed in the first side cover 21. At least one third hole 43 may be formed in the second side cover 21 at a position corresponding to the second hole 42.

The backlight unit 100 having the configuration as described above may be accommodated in the box-shaped bottom cover 110 having an upper side opened.

The bottom surface of the bottom cover 110 on which the optical assembly 10 is mounted may be formed in a concave-convex structure along the rear shape of the optical assembly 10.

For example, a structure including a light source 13, a light incident part 15b of the light guide plate 15, and a side cover 20 may be disposed on the recessed portion 110a of the bottom surface. The light emitting part 15a of the light guide plate 15 may be disposed on the base 110b. The depression 110a and the ridge 110b may be alternately disposed in succession.

The bottom cover 110 of such a shape may be manufactured using a process such as press molding or extrusion molding.

The shape of the depression 110a and the ridge 110b depends on the size and appearance of the optical assembly 10, and the inclination angle of the lower surface of the light guide plate 15 as well as the accommodation of the optical assembly 10 is To be maintained.

In addition, the bottom cover 110 having a bottom surface formed of a concave-convex structure as in the embodiment may be advantageous in maintaining its shape and maintaining rigidity.

On the other hand, like the first embodiment of the present invention, the present embodiment also has a reflecting member 17 on the bottom surface of the light guide plate 15, according to the installation position of the optical assembly 10, that is, the optical assembly 10 The reflective member 17 may be provided as an extended reflecting member 17a or a non-extending reflecting member 17b, depending on which row of the central row C and the left and right rows L and R.

However, since the non-extended reflecting member 17b according to the present embodiment is substantially the same in structure as the non-extended reflecting member 17b according to the first embodiment, the extended reflecting member 17a according to the present embodiment will be described below. Will be described in detail.

9 and 11, the non-extended reflective member 17b according to the present embodiment is disposed on the left side and the right side along the reflective region 171 and the third direction (x-axis direction) of the reflective region 171. An extension area 172 is provided, and a fixed area 173 provided on the other side of the reflection area 171.

The extension region 172 toward the rear side edge of the non-extended reflection member 17b is located at the rear side of the extension region 172 according to the present embodiment, that is, the portion adjacent to the fixed region 173 side of the extension region 172. An inclined portion 176 is formed in which the extension width w3 of Δ is reduced.

The portion where the inclined portion 176 starts in the extension region 172 is eccentric to the rear edge side of the reflective member 17 of the extension length d9 of the extension region 172 in the first direction (y-axis direction). It can be formed at a predetermined position.

At this time, the interference avoidance distance d10 from the rear edge of the reflective member 17 to the portion where the inclined portion 176 starts is the first support portion 22a (see FIG. 11) of the lower side cover 22. It is formed in a size corresponding to the length extending in the direction (y-axis direction).

As the extension width w3 of the extension region 172 corresponding to the interference avoidance distance d10 is reduced than the extension width w3 of the other portion, the extension reflection member 17a disposed in the central column C is provided. May be prevented from interfering with the second side cover 22 of the optical assembly 10 disposed in the left and right rows L, R.

In addition, although the point where the inclined portion 176 is terminated according to the present embodiment is described as being formed at the point where the fixed region 173 and the reflective region 171 contact, the point where the inclined portion 176 terminates is fixed. It is also possible to be formed at any point of the area 173 or at the rear edge of the reflective member 17.

In this case, when the inclined portion 176 is terminated at the point where the fixed region 173 and the reflective region 171 contact each other, the extension region 172 may contact the fixed region 173 and the reflective region 171. Extends to this point.

If the point where the inclined portion 176 ends is located at any point of the fixed area 173 or the rear edge of the reflective member 17, the extension area 172 corresponds to the fixed area 173. Or the rear edge of the reflective member 17.

In addition, a separate inclined portion 176 is not formed in the extension region 172, it is also possible to extend the configuration 172 is formed to extend to a point corresponding to any point of the fixed region 173.

Hereinafter, the configuration of the side cover 20 will be described in detail.

FIG. 12 is a view illustrating the side cover of FIG. 9.

Referring to FIG. 12, the side cover 20 is formed to surround at least a portion of the light guide plate 15 and the light source 13.

The side cover 20 includes a light source 13 and a first side cover 21 disposed above the light incident portion 15b and a second side cover 22 disposed below the light incident portion 15b. can do. And. The side cover 20 may be made of plastic or metal.

In more detail, the first side cover 21 is formed to face the top surface of the light incident part 15b. The first side cover 21 may be bent in a second direction (z-axis line) to face the incident surface 16 on the upper surface of the light incident part 15b.

The second side cover 22 is formed to face the lower surface of the light incident part 15b. The second side cover 22 may be bent in a second direction (z-axis line) to face the incident surface 16 on the bottom surface of the light incident part 15b. The support part 22a of the second side cover 22 may extend in the first direction (y-axis direction) to be inclined along the lower surface of the light guide plate 15, that is, the inclined surface, and may be formed on the second side cover 22. The light source 13 may be stored.

The support 22a supports at least a portion of the bottom surface of the light guide plate 15 and the reflective member 17 in the second direction (z-axis direction).

The first side cover 21 and the second side cover 22 are fastened to each other by the first fixing member 51 so that the light source 13 and the light guide plate 15 are not shaken by an external impact, and in particular, the second direction ( Shake in the z-axis direction can be prevented.

The second side cover 22 may support the inclined surface of the light guide plate 15 to maintain the alignment state of the light guide plate 15 and the light source 13 and to protect it from external impact.

The first hole 41 may be formed at a position corresponding to the protrusion 30 of the light incident part 15b on the first side cover 21.

The first hole 41 may be formed larger than the protrusion 30 so that the protrusion 30 is fitted into the hook. In this case, a circumference of the first hole 41 may be spaced apart from a predetermined edge of the fitted protrusion 30 by the predetermined space, and the space is expanded by the light guide plate 15 due to a change in external environment, for example, a sudden temperature rise. It may be a margin for preventing deformation of the light guide plate 15. In this case, another portion of the protrusion 30 may contact the circumference of the first hole 41 to strengthen the fixing force.

At least one second hole 42 may be further formed in the first side cover 21, and at least one third hole may be formed at a position corresponding to the second hole 42 in the second side cover 21. 43 can be formed.

The second and third holes 42 and 43 may be disposed in a straight line in the first direction (z-axis direction), and the first fixing member 51 may be inserted into the first side cover 21 and the second side cover ( 22) can be securely fixed. In order to secure a fixing force, at least two pairs of second and third holes 42 and 43 may be formed in one optical assembly 10. The second hole 42 and the third hole 43 may be formed at any position of the first side cover 21 and the second side cover 22, respectively.

In the present embodiment, the second and third holes 42 and 43 are described as holes formed therethrough, but at least a part of the fixing member may be inserted to fix the first and second side covers. will be. Accordingly, the second and third holes 42 and 43 may be referred to as first and second insertion portions formed as holes or grooves.

In addition, the first and second side covers 21 and 22 may be referred to as upper and lower covers, respectively.

The second hole 42 in the first side cover 21 may be disposed in a straight line in the first direction (y-axis direction) with the first hole 41. In this case, the coupling force between the light guide plate 15 and the first side cover 21 by the protrusion 30 of the first hole 41 and the light guide plate 15, the second and third holes 42 and 43, and the first fixing The first side cover 21 and the second side cover 22 may be more firmly fixed by the coupling force between the first side cover 21 and the second side cover 22 by the member 51.

Of course, the positions of the holes and the protrusions are not limited thereto, and any position may be used as long as the position of the holes and the protrusions may provide a coupling force between the light guide plate 15 and the side cover 20. That is, the second hole and the third hole are respectively formed in the side portion overlapping the first side cover 21 and the second side cover 22, the fixing member is inserted in the first direction (y-axis direction) Configuration is also possible.

Meanwhile, a fourth hole through which the second fixing member 52 (see FIG. 10) through which the optical assembly 10 is fixed to the bottom cover 110 passes through the first side cover 21 and the second side cover 22. 44 and the fifth hole 45 may be further formed.

The remaining portion of the optical assembly 10 except for the light emitting part 15a of the light guide plate 15 is a first area that does not substantially provide light to the display panel, and includes the first hole 41, the second hole 42, and Due to the arrangement of the third holes 43, the width of the first region may be further reduced.

For example, the case where the second hole 42 and the third hole 43 are disposed between the light emitting diodes 11 is wider than the case where the second hole 42 and the third hole 43 are arranged behind the light emitting diodes 11. Can be reduced.

Here, the shape of the first hole 41, the second hole 42 and the third hole 43 formed in the side cover 20 of the optical assembly 10 may be various, limited to the illustrated form It doesn't happen.

The first fixing member 51 may be a screw or a fixing pin, but is not limited thereto.

When the first fixing member 51 is a screw, peaks and valleys are formed on the inner surfaces of the second and third holes 42 and 43 along the screw line. As a result, the first fixing member 51 is rotated by being fitted into the second hole 42 and the third hole 43, thereby clamping and fixing the light guide plate 15 and the light source 13 sandwiched therebetween.

The first and second side covers 21 and 22 may include the second hole 42 and the third hole to secure the pitch of the thread formed on the inner surfaces of the second hole 42 and the third hole 43. (43) The thickness of the periphery may be made thicker than other portions, or a separate member may be used.

Meanwhile, as described above, a plurality of holes 43 and 45 for fixing are formed at one side of the second side cover 22, and a support part 22a is formed at the other side.

The width of one side of the second side cover 22 extending in the third direction (x-axis direction) is formed as the first extension width w4, and the width of the other side of the second side cover 22 is defined as the first width. It is formed with two extension widths w5.

In this case, the first extension width w4 is greater than the second extension width w5. The first extension width w4 corresponds to the extension width w1 of the light guide plate 15 in the third direction (x-axis direction) and the third direction (x-axis direction) of the reflective region 171. It may be formed equal to the extension width w2.

That is, in a state where a plurality of optical assemblies 10 according to the present embodiment are disposed in the backlight unit 100, the second side cover 22 of the one optical assembly 10 and the optical assembly 10 The spacing between the second side cover 22 of another adjacent optical assembly 10 is the smallest at the position of one side of the second side cover 22 formed with the first extension width w4, The second side cover 22 is formed to have the largest width at the other side of the second extension width w5.

In this embodiment, it is described that the width gradually decreases from one side of the second side cover 22 to the other side.

That is, the extension width w3 of the portion corresponding to the interference avoidance distance d10 in the extension area 172 of the extension reflection member 17a disposed on the center column C side is in one direction, for example, the -y axis direction. Correspondingly decreasing toward, the extension width of the second side cover 22 decreases toward the other direction, for example, in the + y axis direction. Therefore, the extension area 172 of one optical assembly 10 and the second side cover 22 of another optical assembly 10 adjacent to the optical assembly 10 can be prevented from contacting and mutually interfering. have.

In addition, the second side cover 22 is not formed in a configuration in which the extension width gradually decreases toward the other direction, it will also be said that the configuration can be reduced step by step.

According to the proposed embodiment, as the light source 13, the substrate 14 and the light guide plate 15 are integrally coupled by the side cover 22 to constitute one optical assembly 10, the optical assembly 10 Instead of assembling the parts individually, as the assembled optical assembly 10 is disposed in the backlight unit 100, the production of the backlight unit 100 may be facilitated.

13 to 16 illustrate a state in which the extension reflecting member according to the third to sixth embodiments of the present invention is mounted on the light guide plate and the substrate.

Since the optical assembly according to the present embodiments has a difference in the configuration of the extension reflecting member, but in the other configuration is the same as the first embodiment shown in Figs. 1 to 7, only the characteristic parts of the embodiments are described below. Explain.

Referring to FIG. 13, the extension length d7 in the first direction (y-axis direction) of the extension reflecting member 17a according to the third embodiment of the present invention is equal to the first direction of the light guide plate 15 with respect to the first direction. It is formed larger than the extension length d3 of the bottom face.

Therefore, unlike the extension reflecting member 17a according to the first embodiment, the second extension region 178 is located on the other side of the reflection region 171, that is, on the opposite side of the side where the fixed region 173 and the reflection region 171 meet. This is further formed. In this case, the extension area 172 of the extension reflection member 17a according to the first embodiment may be referred to as a first extension area.

Like the first extension region 172, the second extension region 178 does not overlap the light guide plate 15. However, in the state where the plurality of optical assemblies 10 are provided in the backlight unit 100, the first extension region 172 is located at the second separation interval d4, whereas the second extension region 178 is provided. Is located at the first separation interval d6 that intersects with the second separation interval d4.

In addition, the length of the second extension region 178 in the first direction (y-axis direction) is the extension length d7 in the first direction (y-axis direction) of the reflective region 171 and the second extension region 178. ) And the extension length d3 of the light guide plate 15 in the first direction.

That is, the first extension region 171 further extends in the third direction based on the edge crossing the third direction (x-axis direction) among the edges of the light guide plate 15 and the second extension region 178. Silver extends further in the first direction based on an edge crossing the first direction (y-axis direction) of the edge of the light guide plate 15.

The second extension region 178 overlaps with at least a portion of the light guide plate 15 of the other optical assembly 10 adjacent thereto, and is positioned above the light guide plate 15 adjacent thereto, and is disposed in the first direction (y-axis direction). ) Is exposed.

In this case, as in the first exemplary embodiment, an area overlapping the light guide plate 15 may be referred to as the first area. In this case, the first extension area 172 and the second extension area 178 may be referred to as the light guide plate 15. It may be referred to as the second region that does not overlap with.

Next, referring to FIG. 14, the extension length in the first direction (y-axis direction) of the remaining portion other than the fixed region 173 in the extension reflection member 17a according to the present exemplary embodiment may be equal to or greater than that of the light guide plate 15. It is formed smaller than the extension length in the first direction.

Therefore, a part of the bottom of the light guide plate 15 overlaps the reflective region 171, and the other part does not overlap the reflective region 171.

Next, referring to FIG. 15, the extension reflecting member 17a according to the present embodiment includes a pair of extension regions 172 disposed on the left and right sides of the reflection region 171. Unlike the elongated reflecting member 17a, the elongated region 172 is formed on only one of the left and right sides of the reflective region 171.

In detail, the extended region 172 according to the present exemplary embodiment may have the second spaced interval d4 at any one of the left and right edges of the reflective region 171 adjacent to the second spaced interval d4. It is formed extending toward.

In addition, unlike the first embodiment, in the state in which the plurality of optical assemblies 10 are provided in the backlight unit 100, the extended reflection member 17a is not provided with a separate non-extended reflection member 17b. At least a portion of may be provided in a shape overlapping with at least a portion of the other extended reflecting member (17a).

Next, referring to FIG. 16, the extension reflecting member 17a according to the present embodiment is used to fix the extension reflecting member 17a according to the first embodiment with respect to the light source 13 and the substrate 14. Unlike including the fixed region 173, it does not include a separate fixed region 173.

Accordingly, at least a portion of the extended reflecting member 17a according to the present embodiment is seated on at least one of the substrate 14, the bottom cover 110, and the second cover 22, and the upper side is By being pressed downward by the bottom surface of the light guide plate 15, the support of the extended reflecting member 17a can be performed.

17 to 22 are cross-sectional views of backlight units according to seventh to twelfth embodiments of the present invention. 17 to 22 of the seventh to twelfth embodiments correspond to FIG. 8 of the first embodiment cut along the B-B diagram of FIG.

The present embodiments differ only in the configuration of the reflecting member 17 and the kind of the reflecting member 17 disposed on the bottom surface of the light guide plate 15. The other embodiments are the same as in the first embodiment, so The description is omitted and focuses on the characteristic parts of the embodiments.

First, referring to FIG. 17, in the backlight unit 100 according to the seventh embodiment of the present invention, a first surface of the light guide plate 15 disposed at the position C2 of the light guide plate 15 disposed in the center column C may be formed on the bottom surface of the light guide plate 15. An extension reflecting member 17a is provided, and a second extension reflecting member (15) is disposed on a bottom surface of the light guide plate 15 disposed at positions L2 and R2 of the light guide plates 15 disposed in the left row L and the right row R, respectively. 17c).

In more detail, like the extension reflecting member 17a of the first embodiment, the first extension reflecting member 17a has a width w3 in the third direction of the extension region 172 greater than the second interval d4. It is provided in pairs on both the left and right sides of the reflective region 171.

The second extension reflecting member 17c includes an extension region 172 similarly to the first extension reflecting member 17a. At this time, the extension width w3 in the third direction (x-axis direction) of the extension region 172 of the second extension reflecting member 17c is defined by the extension region 172 of the first extension reflecting member 17a. Unlike the extension width w3 for three directions, the width is smaller than the second interval d4.

In addition, the extension regions 172 of the second extension reflection member 17c are provided in pairs on both the left and right sides of the reflection region 171 in the third direction (x-axis direction) similarly to the first extension reflection member 17a.

Therefore, the extension region 172 of the first extension reflecting member 17a and the extension region 172 of the second extension reflecting member 17c according to the present exemplary embodiment overlap at least a part of each other at the second interval d4. do.

Next, referring to FIG. 18, the first extension reflecting member 17A, the left column L, and the right column provided in the central column C of the backlight unit 100 according to the eighth embodiment of the present invention. At least a part of the second extended reflecting member 17C provided in (R), that is, the extension region 172, overlaps each other at the second interval d4.

At this time, unlike the seventh embodiment, the extension width w3 of the extension region 172 of the first extension reflecting member 17A in the third direction (x-axis direction) is smaller than the second interval d4. Is formed.

Therefore, the extension region 172 of the first extension reflection member 17A and the extension region 172 of the second extension reflection member 17C overlap only at the second interval d4.

The other configuration of this embodiment is the same as that of the seventh embodiment, and therefore, detailed description of the configuration is omitted.

Next, referring to FIG. 19, the backlight unit 100 according to the ninth exemplary embodiment of the present invention may include one extension area on the bottom surface of the light guide plate 15 disposed in the left column L and the right column R. Referring to FIG. The third extension reflecting member 17d including only 172 is included.

That is, the backlight unit 100 according to the present exemplary embodiment extends to an edge adjacent to the second interval d4 among the left and right edges in the third direction (x-axis direction) of the third extension reflecting member 17d. The region 172 is formed, and a separate extension region 172 is not formed in the remaining edge.

Therefore, the extension area 172 of the third extension reflecting member 17d disposed at the L2 position of the left column L is formed at the right edge of the third extension reflecting member 17d adjacent to the second interval d4. The extension region 172 of the third extension reflecting member 17d disposed at the R2 position of the right row R is formed at the left edge of the third extension reflecting member 17d.

Since the configuration of the backlight unit 100 according to the present exemplary embodiment is the same as that of the seventh exemplary embodiment except for the configuration of the third extension reflecting member 17d described above, detailed description thereof will be omitted.

Next, referring to FIG. 20, the backlight unit 100 according to the tenth exemplary embodiment of the present invention may include the non-extended reflective member 17b provided on the bottom surface of the light guide plate 15 disposed at the C2 position of the central column C. ) And a fourth extension reflecting member 17e provided on the bottom surface of the light guide plate 15 disposed in the left column L and the right column R.

In more detail, the extension width w3 in the third direction (x-axis direction) of the extension region 172 of the fourth extension reflecting member 17e is greater than the width of the second interval d4. In addition, an extension area 172 is formed at an edge adjacent to the second gap d4 among the left and right edges in the third direction (x-axis direction) of the fourth extension reflecting member 17e, and the remaining edges No separate extension region 172 is formed.

Therefore, the extension region 172 of the fourth extension reflecting member 17e disposed at the L2 position of the left column L is formed at the right edge of the fourth extension reflecting member 17e adjacent to the second interval d4. The extension region 172 of the fourth extension reflecting member 17e disposed at the R2 position of the right row R is formed at the left edge of the fourth extension reflecting member 17e.

At least a part of the extended region 172 of the fourth extended reflecting member 17e overlaps the non-extended reflecting member 17 on the center row C side.

Referring to FIG. 21, the backlight unit 100 according to the eleventh embodiment of the present invention may include the fourth extension reflecting member 17e and the right row R disposed at the left row L and the center row C side. It includes a non-extended reflective member 17b disposed in.

Accordingly, the extension region 172 of the fourth extension reflecting member 17e disposed on the left side column L side is the fourth extension reflecting member 17e on the side of the center column C adjacent to the left side column L side. Overlap with at least a portion of the reflective region 171.

The extension region 172 of the fourth extended reflection member 17e disposed on the center row C side is at least the reflection region 171 of the non-extended reflection member 17b disposed on the right row R side. Overlap with some

In the configuration of the backlight unit 100 according to the exemplary embodiment of the present invention, the fourth extended reflecting member 17e is disposed at the left column L and the central column C, and the non-extending reflecting member 17 is the right column. In the arrangement arranged on the (R) side, there is only a difference from the configuration of the backlight unit 100 according to the ninth embodiment, and since the overlapping configuration is substantially the same, detailed description thereof will be omitted.

Referring to FIG. 22, the backlight unit 100 according to the twelfth embodiment of the present invention is positioned at the center column C side, and extends 172 disposed at left and right edges of the reflective area 171. And a fifth extension reflecting member 17f each having an extension width w31 and w32 in a third direction (x-axis direction) of each of different sizes.

At this time, the extension widths w31 and w32 of the extension region 172 are formed larger than the size of the second interval d4.

In addition, the non-extended reflective member 17a is disposed in the left column L and the right column R, so that at least a part of the reflective region 171 of the non-extended reflective member 17a is the fifth extended reflective member 17f. Overlaps with at least a portion of the extending area 172.

23 to 26 are cross-sectional views of backlight units according to thirteenth to sixteenth embodiments of the present invention.

In the thirteenth to sixteenth embodiments of the present invention, unlike the first embodiment in which the light guide plate 15 is arranged in three columns, that is, left, right, and center columns (L, R, C), The light guide plate 15 is disposed in the right, first and second center columns L, R, C1, and C2, that is, four rows in total. In the following description, the characteristic parts of the embodiments will be described.

First, referring to FIG. 23, in the backlight unit 100 according to the thirteenth embodiment of the present invention, the second extension reflecting member 17c may be disposed on the bottom surface of the light guide plate 15 only in one column L of four columns. The sixth extension reflecting member 17g is provided on the bottom surface of the light guide plate 15 in the remaining rows R, C1, and C2.

More specifically, the second extending reflecting member 17c includes a pair of extending regions 172 formed as extending widths smaller than the second interval d as described above, and L2 in the left column L. FIG. It is provided in the bottom face of the light guide plate 15 of a position.

Meanwhile, the sixth extension reflecting member 17g includes a pair of extension regions 172 and is disposed in the first and second central rows C1 and C2 and the right row R. As shown in FIG. At this time, the extension width of any one of the extension regions 172 of the extension regions 172 of the sixth extension reflecting member 17g formed to have different widths is greater than the second interval d4, and the other An extension width of the extension region 172 is smaller than the second interval d4.

In addition, the extension area 172 of the extension area 172 of the extension area 172 of the sixth extension reflection member 17g adjacent to the C11 position in the first central column C1 is larger than the second interval d4. At least a part of the left column L overlaps at least a part of the second extension reflecting member 17c provided at the L2 position.

The sixth extension reflecting members 17g provided at positions C11 of the first central row C1, C12 of the second central row C2, and R2 of the right row R may be at least partially overlapped with each other. A portion of the bottom cover 110 is prevented from being exposed in the second direction (z-axis direction) through the second gap d4.

Next, referring to FIG. 24, the backlight unit 100 according to the fourteenth embodiment of the present invention may include a non-extending reflective member 17b disposed in the left column L and the right column R, respectively, and the first unit. And sixth extension reflecting members 17g disposed in the central row C1 and the second central row C2.

Next, referring to FIG. 25, the backlight unit 100 according to the fifteenth embodiment of the present invention may include a non-extended reflective member 17b disposed in the left column L and the right column R, respectively, and the first unit. A fourth extension reflecting member 17e disposed on the center row C1 side and including one extension region 172 overlapping at least a portion of the non-extending reflecting member 17b on the left side column L side, Two extension regions disposed on the second central row C2 side and overlapping at least a portion of the non-extended reflecting member 17b and the at least part of the fourth extended reflecting member 17e on the right row R side, respectively ( And a first extension reflecting member 17a including 172.

Finally, referring to FIG. 26, the backlight unit 100 according to the sixteenth embodiment of the present invention includes an unextended reflecting member 17b disposed in the left column L, and first and second central columns C1. And a fourth extension reflecting member 17e disposed at the side of C2 and the right row R, and including one extension region 172 overlapping at least a portion of another adjacent reflecting member.

1 is an exploded perspective view showing the configuration of a display device according to a first embodiment of the present invention.

2 is a cross-sectional view showing a display module configuration according to the A-A diagram of FIG.

3 is a plan view briefly showing a configuration of a backlight unit;

4 is an exploded perspective view showing an optical assembly according to a first embodiment of the present invention.

5 is a view showing an extension reflecting member according to a first embodiment of the present invention;

6 is a view showing an unextended reflective member according to the first embodiment of the present invention.

7 is a plan view illustrating a state in which an extension reflecting member according to a first embodiment of the present invention is mounted on a light guide plate and a substrate.

FIG. 8 is a cross-sectional view of the backlight unit taken along the line B-B of FIG. 3; FIG.

9 is a cross-sectional view showing a backlight unit according to a second embodiment of the present invention.

FIG. 10 is a perspective view illustrating the light guide plate and the extension reflecting member of FIG. 9; FIG.

11 is a plan view showing a reflective member according to a second embodiment of the present invention.

FIG. 12 shows the top and bottom covers of FIG. 9; FIG.

FIG. 13 is a view illustrating a state in which an extension reflecting member according to a third embodiment of the present invention is mounted on a light guide plate and a substrate. FIG.

14 is a view showing a state in which an extension reflecting member according to a fourth embodiment of the present invention is mounted on a light guide plate and a substrate.

FIG. 15 is a view illustrating a state in which an extension reflecting member according to a fifth embodiment of the present invention is mounted on a light guide plate and a substrate. FIG.

16 is a view illustrating a state in which an extension reflecting member according to a sixth embodiment of the present invention is mounted on a light guide plate and a substrate.

17 is a cross-sectional view of a backlight unit according to a seventh embodiment of the present invention.

18 is a cross-sectional view of a backlight unit according to an eighth embodiment of the present invention;

19 is a cross-sectional view of a backlight unit according to a ninth embodiment of the present invention;

20 is a cross-sectional view of a backlight unit according to a tenth embodiment of the present invention.

21 is a sectional view of a backlight unit according to an eleventh embodiment of the present invention;

22 is a cross-sectional view of a backlight unit according to a twelfth embodiment of the present invention;

23 is a sectional view of a backlight unit according to a thirteenth embodiment of the present invention;

24 is a cross-sectional view of a backlight unit according to a fourteenth embodiment of the present invention;

25 is a cross-sectional view of a backlight unit according to a fifteenth embodiment of the present invention;

25 is a cross-sectional view of a backlight unit according to a sixteenth embodiment of the present invention;

Claims (33)

Board; A plurality of light sources arranged on the substrate and emitting light with a predetermined direction angle with respect to a first direction; A light incident part including an incident surface from which the light is incident from the plurality of light sources in a first direction; and light emitted from the incident light in a second direction crossing the first direction and having one side connected to the light incident part A light guide plate including a portion; And And a reflective member including a reflective region overlapping the light guide plate and an extension region not overlapping the light guide plate. The method of claim 1, And the reflecting member is formed parallel to a plane formed by the first direction and the third direction crossing the second direction and the first direction. The method of claim 1, And the reflective region is located below the light guide plate and faces the bottom surface of the light guide plate. The method of claim 1, The extension region extends in an outward direction based on the edge of the light guide plate and is exposed in the second direction. The method of claim 1, And a cover surrounding at least a portion of the light guide plate, the substrate and the light sources. The method of claim 5, The cover, A first cover covering at least a portion of an upper surface of the substrate on which the light sources are disposed; And a second cover covering at least a portion of the bottom surface of the substrate. The method of claim 6, The extension width of the one side of the second side cover in the third direction is larger than the extension width of the second side cover of the second side cover in the first direction at a distance from the one side in the third direction. Optical assembly made with. The method of claim 1, The extension width in the third direction at one point of the extension area is in the third direction at another point in the extension area spaced by a distance in the direction opposite to the first direction at the point. And an extension width for the optical assembly. The method of claim 1, The extension area, A first extension region further extending in the third direction based on an edge crossing the third direction among the edges of the light guide plate; And And a second extension region extending further in the first direction based on an edge crossing the first direction among the edges of the light guide plate. Board; A plurality of light sources arranged on the substrate and emitting light with a predetermined direction angle with respect to a first direction; A light incident part including an incident surface from which the light is incident from the plurality of light sources in a first direction; and light emitted from the incident light in a second direction crossing the first direction and having one side connected to the light incident part A light guide plate including a portion; And And a reflective member including a first region overlapping the light guide plate and a second region not overlapping the light guide plate. Bottom cover; A substrate accommodated in the bottom cover; A plurality of light sources arranged on the substrate and emitting light with a predetermined direction angle with respect to a first direction; A light incident part including an incident surface from which the light is incident from the plurality of light sources in a first direction; and light emitted from the incident light in a second direction crossing the first direction and having one side connected to the light incident part A plurality of light guide plates comprising a portion; At least one reflective member including a reflection region overlapping with any one of the light guide plates and an extension region not overlapping the light guide plate; And And a optical sheet disposed on the light guide plate. The method of claim 1, And the reflective member is formed in parallel with a plane formed by the first direction and the third direction crossing the second direction and the first direction, respectively. The method of claim 11, At least a portion of the one LGP is located on an upper side of at least a portion of another LGP adjacent to the LGP. The method of claim 11, And the extension region of the reflective member positioned below the one light guide plate overlaps the reflective region of the reflective member positioned below another light guide plate adjacent to the light guide plate. The method of claim 11, At least a portion of the extension region of any one reflective member is located below the reflective region of another reflective member adjacent to the reflective member. The method of claim 11, The reflective region is facing the bottom surface of the light guide plate. The method of claim 11, The extension region extends outside the edge of the light guide plate and is exposed in the second direction. The method of claim 11, And a cover that covers a portion of an upper side of the light incident part and a portion of a lower side of the light guide plate, and covers the light source in an inner space. The method of claim 18, At least a portion of the cover is fixed to the bottom cover. The method of claim 18, The cover, A first cover covering at least a portion of an upper surface of the substrate on which the light sources are disposed; And a second cover covering at least a portion of a bottom surface of the substrate. The method of claim 18, The extension width in the third direction at one point of the extension area is relative to the third direction at another point in the extension area spaced by a distance in the direction opposite to the first direction at the one point. A backlight unit, characterized in that greater than the extension width. The method of claim 11, And a plurality of divided driving regions corresponding to the plurality of light guide plates, wherein each of the divided driving regions is configured to adjust luminance according to the luminance of the image signal or the color coordinate signal. The method of claim 11, Any one of the plurality of light guide plates and a light guide plate adjacent to the light guide plate are spaced apart from each other by a predetermined distance to form a space. At least a portion of the reflective member disposed on the bottom surface of any one of the two light guide plates adjacent to each other is positioned in the space, and the inner surface of the bottom cover is exposed to the first direction through the space. Backlight unit prevented. The method of claim 23, wherein The reflective member is provided in plurality, The extension region of any one of the plurality of reflective members, An overlapping region overlapping with the extending region or the reflecting region of another adjacent reflecting member; And And a non-overlapping area provided in the separation space and not overlapping with another adjacent reflection member. The method of claim 11, The extension area, A first extension region further extending in the third direction based on an edge crossing the third direction among the edges of the light guide plate; And And a second extension region further extending in the first direction based on an edge crossing the first direction among the edges of the light guide plate. The method of claim 11, The extension area, A first extension region further extending in the third direction based on an edge crossing the third direction among the edges of the light guide plate and overlapping at least a portion of the reflective member of the other optical assembly disposed in the third direction; And A display including a second extension region further extending in the first direction based on an edge crossing the first direction among the edges of the light guide plate and overlapping at least a portion of another optical assembly disposed in the first direction Device. One or more optical sheets; A plurality of optical assemblies located below the optical sheet; And A bottom cover on which the plurality of optical assemblies are received and to which the optical sheet is fixed; The optical assembly, Board; A plurality of light sources arranged on the substrate and emitting light with a predetermined direction angle with respect to a first direction; A light incident part including an incident surface from which the light is incident from the plurality of light sources in a first direction; and light emitted from the incident light in a second direction crossing the first direction and having one side connected to the light incident part At least one light guide plate comprising a portion; A reflection member disposed below the light guide plate and including a reflection area overlapping the light guide plate and an extension area not overlapping the light guide plate; Any one edge of the light guide plate provided in any one of the plurality of optical assemblies is spaced apart by a predetermined distance from any one edge of the light guide plate provided in another adjacent optical assembly, At least a portion of the extending area of the reflective member of the optical assembly of any one of the optical assemblies is located at the separation interval, and the other portion overlaps at least a portion of the reflective member of another adjacent optical assembly. Backlight unit. Display panel; A backlight unit positioned on a rear surface of the display panel, divided into a plurality of blocks, and the plurality of blocks individually driven; And a driver provided at the rear of the backlight unit to drive the display panel and / or the backlight unit. The backlight unit, Bottom cover; A substrate accommodated in the bottom cover; A plurality of light sources arranged on the substrate and emitting light with a predetermined direction angle with respect to a first direction; A light incident part including an incident surface from which the light is incident from the plurality of light sources in a first direction; and light emitted from the incident light in a second direction crossing the first direction and having one side connected to the light incident part A plurality of light guide plates comprising a portion; At least one reflective member including a reflection region overlapping with any one of the light guide plates and an extension region not overlapping the light guide plate; And And an optical sheet disposed above the light guide plate. 29. The method of claim 28, The reflective member An overlapping region overlapping with the extending region or the reflecting region of another adjacent reflecting member; And And a non-overlapping area provided in the separation space and not overlapping with another adjacent reflection member. 29. The method of claim 28, Any one of the plurality of light guide plates and the light guide plate adjacent to the light guide plate are spaced apart from each other by a predetermined distance to form a spaced interval, The extension region of the reflective member disposed below one of the light guide plates of the two light guide plates adjacent to each other is positioned at the separation intervals, and the inner surface of the bottom cover is exposed to the first direction through the separation intervals. To prevent the display device. 29. The method of claim 28, The extension area, A first extension region further extending in the third direction based on an edge crossing the third direction among the edges of the light guide plate and overlapping at least a portion of the reflective member of the other optical assembly disposed in the third direction; And A display including a second extension region further extending in the first direction based on an edge crossing the first direction among the edges of the light guide plate and overlapping at least a portion of another optical assembly disposed in the first direction Device. 29. The method of claim 28, And at least a portion of the extension region of any one reflective member is located below the reflective region of another reflective member adjacent to the reflective member. 29. The method of claim 28, The display panel is divided into a plurality of divided driving regions corresponding to the plurality of light guide plates, A brightness of each of the divided driving regions is adjusted by adjusting luminance of at least one light source corresponding to the light guide plate corresponding to each of the divided driving regions according to the luminance of the image signal or the color coordinate signal. Device.

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