KR20120129460A - Liquid crystal display device - Google Patents

Abstract

PURPOSE: A liquid crystal display device is provided to fix a light guide plate by fixing a light guide plate by combining a main support and a bottom cover. CONSTITUTION: A plurality of fixing protrusions(300) are formed in a bottom cover(150). A backlight unit(120) is settled on the cover bottom. When a main support(130) is combined, each fixing protrusion is inserted into fastening grooves(220) within fixing projections. A plurality of fastening protrusions(210) is formed the main support. The main support and the bottom cover fix a light guide plate(123).

Description

[0001] LIQUID CRYSTAL DISPLAY DEVICE [0002]

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device capable of stably fixing a light guide plate.

A liquid crystal display device (LCD), which is advantageous for moving picture display and has a large contrast ratio and is actively used in TVs and monitors, exhibits optical anisotropy and polarization properties of a liquid crystal, And the like.

Such a liquid crystal display is an essential component of a liquid crystal panel bonded through a liquid crystal layer between two side-by-side substrates, and realizes a difference in transmittance by changing an arrangement direction of liquid crystal molecules with an electric field in the liquid crystal panel. do.

However, since the liquid crystal panel does not have its own light emitting element, a separate light source is required in order to display the difference in transmittance as an image. To this end, a backlight unit in which a light source is embedded is disposed on the back of the liquid crystal panel.

The backlight unit includes a light source and is classified into a direct type and an edge type according to the position of the light source. The backlight unit of the direct type emits light from the light source by arranging the light source under the liquid crystal panel. It is a method of directly supplying the light to the liquid crystal panel, the backlight unit of the side-type method is disposed from the light source by using the refraction and reflection in the light guide plate by arranging the light guide plate under the liquid crystal panel, and by placing the light source on at least one side of the light guide plate Indirect light is supplied to the liquid crystal panel.

In this case, the side type backlight unit is easier to manufacture than the direct type backlight unit, and has a thin shape, light weight, and low power consumption.

1 is a cross-sectional view of a conventional liquid crystal display module.

As shown in FIG. 1, the liquid crystal display module includes a liquid crystal panel 10 including the first and second substrates 12 and 14 and a backlight unit 20 positioned behind the liquid crystal panel 10.

The liquid crystal panel 10 plays a key role in image expression, and is composed of first and second substrates 12 and 14 bonded to each other with a liquid crystal layer interposed therebetween.

First and second polarizing plates 19a and 19b for selectively transmitting only specific light are attached to the outer surfaces of the first and second substrates 12 and 14, respectively.

The backlight unit 20 includes an LED assembly (not shown), a reflector 25 seated on the cover bottom 50, a light guide plate 23 positioned on the reflector 25, and an upper portion of the light guide plate 23. It includes a plurality of interposed optical sheets 21.

The liquid crystal panel 10 and the backlight unit 20 are modularized through the top cover 40, the support main 30, and the cover bottom 50. The edges of the liquid crystal panel 10 and the backlight unit 20 may be squared. In the state where the frame-shaped support main 30 is worn, the top cover 40 covering the front edge of the liquid crystal panel 10 and the cover bottom 50 covering the back of the backlight unit 20 are respectively coupled in front and rear to support main. 30 is integrated through the medium.

At this time, a plurality of fixing pins 80 are inserted in the direction toward the liquid crystal panel 10 through a plurality of through holes (not shown) formed in the cover bottom 50 to prevent the light guide plate 23 from flowing. The fixing pin 80 is positioned at the edge of the liquid crystal display module and the non-display area.

On the other hand, the liquid crystal display device has recently been increasingly used, such as portable computers, desktop computer monitors and wall-mounted televisions, and has a wider display area and a narrower bezel width. Is actively underway.

However, as the width of the bezel decreases, as the plurality of fixing pins 80 are located closer to the display area, the light leakage phenomenon in which light emitted from the light guide plate 23 leaks to the outside increases, thereby degrading image quality.

In addition, as a plurality of fixing pins 80 are located in the non-display area, there is a problem in that a limit is generated in reducing the width of the bezel.

The present invention for solving the above problems, the support main and the cover bottom formed by the coupling means is coupled to each other to fix the light guide plate to provide a liquid crystal display device that can be fixed to the light guide plate more stably while reducing the width of the bezel as possible The purpose is to.

Another object of the present invention is to provide a liquid crystal display device which can prevent deterioration of image quality due to light leakage by covering a fixing member with a fixing member.

In order to achieve the above object, a liquid crystal display device according to the present invention, the liquid crystal panel; A backlight unit positioned on a rear surface of the liquid crystal panel; A support main bordering an edge of the liquid crystal panel and the backlight unit; A top cover coupled to the support main from the front of the liquid crystal panel; A cover bottom coupled to the support main is coupled to the back of the backlight unit, and the back of the support main includes a plurality of fastening protrusions including fastening grooves formed along at least one edge thereof. Corresponding to the plurality of fastening projections is characterized in that a plurality of fixing projections are inserted into each of the plurality of fastening grooves.

The backlight unit may include a plurality of through holes corresponding to the plurality of fastening protrusions.

It characterized in that it further comprises a plurality of side reflection member surrounding each of the plurality of fastening projections.

Here, each of the plurality of side reflection members is characterized in that the outer surface of the outer surface in contact with at least one side of the light guide plate of each of the plurality of fastening projections.

The backlight unit may include an LED assembly, a light guide plate facing at least one side of the LED assembly, and a plurality of optical sheets positioned on the light guide plate.

Alternatively, the backlight unit may include a plurality of LED assemblies including a plurality of LEDs arranged on the cover bottom, a reflection plate positioned on the plurality of LEDs, a diffusion plate positioned on the reflection plate, and the diffusion plate. It characterized in that it comprises a plurality of optical sheets located on the top.

According to the liquid crystal display device according to the present invention, the support main and the cover bottom each having the coupling means integrally coupled to each other by the coupling means can fix the light guide plate more stably by fixing the light guide plate.

Accordingly, it is not necessary to use a fixing pin to fix the light guide plate as in the related art, thereby reducing component cost and assembly time.

In particular, it is possible to improve the image quality of the liquid crystal display device by preventing light leakage by covering the coupling means with a reflective member.

1 is a cross-sectional view of a conventional liquid crystal display module.
2 is an exploded perspective view schematically illustrating a liquid crystal display module according to an exemplary embodiment of the present invention.
3 is a cross-sectional view partially showing a liquid crystal display module according to an embodiment of the present invention.
Figure 4 is a perspective view showing a support main according to an embodiment of the present invention.
FIG. 5 is a rear perspective view illustrating a part of a support main and a plurality of optical sheets and a light guide plate seated on a rear surface thereof according to an embodiment of the present invention; FIG.
6 is a perspective view showing a cover bottom according to an embodiment of the present invention.
7 is a perspective view showing a part of the cover bottom and a reflecting plate and a light guide plate seated thereon according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 2 is an exploded perspective view schematically illustrating a liquid crystal display module according to an embodiment of the present invention, and FIG. 3 is a cross-sectional view illustrating a portion of the liquid crystal display module according to an embodiment of the present invention.

As shown in FIG. 2 and FIG. 3, the liquid crystal display module 100 supports the liquid crystal panel 110, the backlight unit 120, and the liquid crystal panel 110 and the backlight unit 120. The main 130, the cover bottom 150, the top cover 140 is composed of.

The liquid crystal panel 110 plays a key role in image expression. The liquid crystal panel 110 includes first and second substrates 112 and 114 bonded to each other with a liquid crystal layer interposed therebetween.

Although not shown in the drawings, a plurality of gate lines and data lines intersect on the inner surface of the first substrate 112, which is commonly referred to as a lower substrate or an array substrate, under the premise of an active matrix scheme, and pixels are defined at each intersection. A thin film transistor (TFT) is provided to correspond one-to-one with a transparent pixel electrode formed in each pixel.

In addition, the inner surface of the second substrate 114 called the upper substrate or the color substrate may correspond to each pixel, for example, a color filter of red (R), green (G), and blue (B) color and each of them. A black matrix covering the non-display elements such as gate lines, data lines, and thin film transistors is provided.

First and second polarizing plates 119a and 119b for selectively transmitting only specific light are attached to the outer surfaces of the first and second substrates 112 and 114, respectively.

In addition, a printed circuit board (not shown) is connected along at least one edge of the liquid crystal panel 110 through a connecting member (not shown) such as a flexible circuit board or a tape carrier package (TCP). During the modularization process, the support main 130 may be properly folded and adhered to the rear surface or the cover bottom 150.

When the thin film transistor selected for each gate line is turned on by the on or off signal of the gate driving circuit transmitted through the printed circuit board (not shown), the liquid crystal panel 110 having the above- The signal voltage of the liquid crystal molecules is transmitted to the corresponding pixel electrode through the data line and the alignment direction of the liquid crystal molecules is changed by the electric field between the pixel electrode and the common electrode.

On the rear surface of the liquid crystal panel 110, a backlight unit 120 is provided to supply light so that the difference in transmittance can be displayed as an image.

The backlight unit 120 includes a light source arranged along an edge of the support main 130, a reflector 125, a light guide plate 123 seated on the reflector 125, and a plurality of optical sheets interposed thereon. (121).

As a light source, an LED 129a is used. Each of the plurality of LEDs 129a is spaced at a predetermined interval and mounted on a printed circuit board (PCB) 129b to form an LED assembly 129.

Although not shown in the drawings, a fluorescent lamp may be used instead of the LED assembly 129, and when the fluorescent lamp is used, a lamp guide for protecting and guiding the outside of the fluorescent lamp and concentrating light toward the light guide plate 123 may be further included. Can be.

The LED assembly 129 is fixed by a method such as adhesion so that light emitted from the plurality of LEDs 129a faces the light incident part of the light guide plate 123.

The LED assembly 129 may be arranged on one side of the light guide plate 123 as shown in the drawing, but is not limited thereto and may be arranged on both sides or all sides of the light guide plate 123.

Then, an LED driver integrated circuit (IC) (not shown) for driving each block of the LED assembly 129 is mounted.

Accordingly, the light emitted from the plurality of LEDs 129a of the LED assembly 129 is indirectly supplied to the liquid crystal panel 110 using refraction and reflection from the light guide plate 123.

The reflection plate 125 is positioned on the rear surface of the light guide plate 123 to reflect the light passing through the rear surface of the light guide plate 123 toward the liquid crystal panel 110 to improve the brightness of the light.

The light guide plate 123 evenly spreads the light incident from each of the plurality of LEDs 129a to a wide area of the light guide plate 123 while propagating through the light guide plate 123 by a plurality of total reflections to provide a surface light source to the liquid crystal panel 110. Be sure to

The light guide plate 123 may include a pattern of a specific pattern on the back surface to supply a uniform surface light source. The pattern may be configured in various ways, such as an elliptical pattern, a polygon pattern, a hologram pattern, and the like to guide the light incident to the light guide plate 123. The lower surface of the 123 may be formed by a printing method or an injection method.

The liquid crystal panel 110 and the backlight unit 120 described above are modularized through the top cover 140, the support main 130, and the cover bottom 150.

The top cover 140 has a rectangular frame having a cross section bent in a-shape so as to cover the front and side edges of the liquid crystal panel 110 so that an image implemented in the liquid crystal panel 110 can be displayed.

The support main 130 extends from the vertical portion and the vertical portion that surrounds the edge of the liquid crystal panel 110 and the edge of the backlight unit 120 to partially cover the edge of the liquid crystal panel 110 and the front portion of the edge of the backlight unit 120. It consists of a horizontal part covering.

The support main 130 is characterized in that a plurality of fastening protrusions 210 including fastening grooves 220 are formed along at least one edge thereof.

The cover bottom 150, on which the backlight unit 120 is seated and serves as a base of the entire apparatus of the liquid crystal display device module 100, includes a side plate having at least one edge thereof vertically bent in a rectangular plate shape.

At this time, the front cover cover 150 at a position corresponding to the plurality of fastening protrusions 210 formed on the support main 130 is characterized in that a plurality of fixing protrusions protruding a predetermined height is provided.

Here, although the plurality of fixing protrusions 300 are shown to be provided along the both edges of the rear surface of the cover bottom 150, all edges or one edge corresponding to the plurality of fastening protrusions 210 of the support main 130 Only may be provided a large number.

Meanwhile, each of the reflector plate 125 mounted on the cover bottom 150, the light guide plate 123 positioned at an upper portion thereof, and the plurality of optical sheets 121 positioned at an upper portion thereof are provided in the support main 130. A plurality of through holes 120a corresponding to the fastening protrusions 210 of are formed.

That is, each of the reflector plate 125, the light guide plate 123 positioned at an upper portion thereof, and the plurality of optical sheets 121 positioned at an upper portion thereof include a plurality of through holes 120a having at least one side portion thereof open.

Therefore, the plurality of fastening protrusions 210 provided in the support main 130 pass through the plurality of through holes 120a formed in the plurality of optical sheets 121, the light guide plate 123, and the reflecting plate 125, respectively. After passing through the plurality of through holes (120a) is coupled to a plurality of fixing protrusions 300 provided in the cover bottom 150, each of the plurality of fastening grooves 220 included in the plurality of fastening protrusions 210 A plurality of fixing protrusions 300 are inserted to be coupled to each other.

The support main 130 is provided with a plurality of side reflection members 400 surrounding the outer surface of each of the plurality of fastening protrusions 210, as shown in FIG.

Each of the plurality of side reflection members 400 reflects the light emitted from the side surface of each of the plurality of through holes 120a formed on at least one side of the light guide plate 123 to the light guide plate 123 to minimize the loss of light. Play a role. This will be discussed in detail later.

Accordingly, the liquid crystal panel 110 and the backlight unit 120 have a top frame 140 covering the top edge of the liquid crystal panel 110 in a state where the edge is surrounded by the support main 130 having a rectangular frame shape, and the backlight unit 120. The cover cover 150 that covers the back surface 150 is coupled to the front and rear, respectively, and is integrated and modularized through the support main 130.

In this case, the backlight unit 120 may be inserted into the plurality of fixing protrusions 300 provided in the cover bottom 150 in the plurality of fastening grooves 220 included in the plurality of fastening protrusions 210 provided in the support main 130. In particular, the light guide plate 123 may be more stably fixed to prevent the light guide plate 123 from being lifted up.

Meanwhile, the first pad 160a is disposed at at least one edge between the support main 130 and the liquid crystal panel 110, more precisely between the support main 130 and the first polarizing plate 119a attached to the liquid crystal panel 110. The first pad 160a may be a first polarizing plate 119a attached to the liquid crystal panel 110 and further the liquid crystal panel 110 in a process of modularizing the liquid crystal panel 110 and the backlight unit 120. ) And to prevent the flow of the liquid crystal panel 110.

In addition, at least one edge between the top cover 140 and the liquid crystal panel 110, more precisely between the top cover 140 and the second polarizing plate 119b attached to the liquid crystal panel 110, may include a second pad 160b. The first pad 160b may include a second polarizing plate 119b attached to the liquid crystal panel 110 and a liquid crystal panel when the top cover 140 is coupled in front of the liquid crystal panel 110. It is to protect the 110 and to prevent the flow of the liquid crystal panel 110.

As it is modularized, the light emitted from each of the plurality of LEDs 129a of the backlight unit 120 is incident on the light incident part of the light guide plate 123, and then refracted toward the liquid crystal panel 110 therein, and the reflecting plate While passing through the plurality of optical sheets 121 together with the light reflected by the 125 is processed into a more uniform high-quality surface light source is supplied to the liquid crystal panel 110.

Here, the top cover 140 may be referred to as a case top or a top case, the support main 130 may be referred to as a guide panel or a main support, and a mold frame, and the cover bottom 150 may be referred to as a bottom cover.

Hereinafter, the structure of the support main and cover bottom of the present invention will be described in detail with reference to the accompanying drawings.

4 is a rear perspective view illustrating a rear structure of the support main according to the preferred embodiment of the present invention, and FIG. 5 illustrates a part of the support main and the plurality of optical sheets and the light guide plate seated on the back of the support main according to the preferred embodiment of the present invention. In perspective view, see FIGS. 2 and 3.

Referring to FIG. 4, a plurality of fastening protrusions 210 including fastening grooves 220 are formed on at least one edge of the support main 130.

The plurality of fastening protrusions 210 protrude toward the front surface of the cover bottom 150 to correspond to each of the plurality of fixing protrusions 300 formed on the front surface of the cover bottom 150 to be coupled to each other.

In particular, the plurality of fastening protrusions 210 are formed on at least one edge of the support main 130 corresponding to the non-display area of the liquid crystal display module 100 of FIG. 2 so that the bezel width of the liquid crystal display device can be reduced. do.

In addition, each of the plurality of fastening grooves 220 included in the plurality of fastening protrusions 210 is formed to have a size and a depth corresponding to each of the plurality of fixing protrusions 300 formed on the cover bottom 150. It is to be coupled with the fixing projection (300).

At this time, the plurality of fastening protrusions 210 are provided with a plurality of side reflecting members 400 surrounding the outer surface of each of the plurality of fastening protrusions 210, each of the plurality of side reflecting members 400 of the light guide plate 123 The light emitted from the side surface of each of the plurality of through holes 120a is leaked to the outside by each of the plurality of through holes 120a formed in at least one side and each of the plurality of fastening protrusions 210 contacting the plurality of through holes 120a. Is provided for.

Each of the plurality of side reflection members 400 surrounds an outer surface which is in contact with each of the plurality of through holes 120a among the outer surfaces of each of the plurality of fastening protrusions 210.

Here, each of the plurality of side reflection members 400 is emitted from the light guide plate 123 so as to surround the outer surface of an area larger than the area in contact with the side of each of the plurality of through holes 120a in each of the plurality of fastening protrusions 210. Light loss of the light guide plate 123 may be minimized by allowing the light to be reflected back to the light guide plate 123. The side reflection member 400 may be in the form of a plate or sheet.

As such, as the rear surface of the support main 130 provided with the side reflection member 400 surrounding a part of the outer surface of each of the plurality of fastening protrusions 210 formed on the support main 130, as shown in FIG. The optical sheets 121 and the light guide plate 123 are sequentially positioned.

The support main 130 including the plurality of fastening protrusions 210 may be manufactured by injection molding used to mold a specific shape and integrally formed with the plurality of fastening protrusions 210.

6 is a perspective view illustrating a structure of a cover bottom according to a preferred embodiment of the present invention, and FIG. 7 is a rear perspective view partially showing a cover bottom and a reflecting plate and a light guide plate seated therein according to a preferred embodiment of the present invention. See FIG. 3.

Referring to FIG. 6, each of the plurality of fastening grooves 220 included in the plurality of fastening protrusions 210 corresponds to each of the plurality of fastening protrusions 210 formed on the support main 130 on the front of the cover bottom 150. It is provided with a plurality of fixing projections 300 are coupled to.

Each of the plurality of fixing protrusions 300 protrudes toward the support main 130 so as to correspond to the plurality of fastening protrusions 210 formed on at least one edge of the rear surface of the support main 130 to be coupled to each other.

Accordingly, the plurality of fixing protrusions 300 provided on the cover bottom 150 correspond to the position and number of the plurality of fastening protrusions 210 provided on the support main 130, and the plurality of fastening grooves 220 of the plurality of fastening protrusions 220. It has a shape corresponding to the shape.

For example, each of the plurality of fixing protrusions 300 may have a square pillar shape or a cylinder shape. When each of the plurality of fixing protrusions 300 has a square pillar shape, each of the plurality of fixing protrusions 300 may be inserted. The fastening groove 220 is a rectangular pillar groove corresponding to the rectangular pillar shape. When each of the plurality of fixing protrusions 300 is a cylindrical shape, the plurality of locking grooves 220 into which each of the plurality of fixing protrusions 300 are inserted are cylindrical. Corresponding to the cylindrical groove.

Accordingly, as shown in FIG. 7, the reflector plate 125 and the light guide plate 123 are seated on the cover bottom 150 on which the plurality of fixing protrusions 300 are formed.

Thereafter, a plurality of optical sheets 121 are interposed into the upper portion of the light guide plate 123, and the support main 130 is coupled in front of the cover bottom 150, and a plurality of fixing protrusions formed in the cover bottom 150 are provided. Each of the 300 corresponding to each of the plurality of fastening protrusions 210 including a plurality of fastening grooves 220 formed in the support main 130 is inserted into each of the plurality of fastening grooves 220.

As described above, each of the plurality of fixing protrusions 300 formed on the cover bottom 150 includes a backlight unit 120, that is, a reflective plate 125, a light guide plate 123, and a plurality of optical sheets 121 on the cover bottom 150. When the support main 130 is coupled to the support main 130 in front of the seat is inserted into the plurality of fastening grooves 220 in the plurality of fastening protrusions 210 formed in the support main 130 to be modularized to support the main 130 and The cover bottom 150 may firmly fix the backlight unit 120, particularly the light guide plate 123.

The cover bottom 150 including the plurality of fixing protrusions 300 may be manufactured by injection molding used to mold a specific shape and may be integrally formed with the plurality of fixing protrusions 300.

As described above, the plurality of fixing protrusions 300 formed on the cover bottom 150 and the plurality of coupling protrusions 210 formed on the support main 130 are more firmly fixed to the backlight unit 120, in particular, the light guide plate 123. By doing so, it is possible to prevent deformation of the light guide plate 123 due to thermal expansion or other causes, bending warpage or lifting.

In addition, the side reflection member 400 surrounding a part of the outer surface of the plurality of coupling protrusions 210 formed on the support main 130 prevents light leakage caused by the light leaking from the light guide plate 123 to prevent deterioration of image quality. Will be.

Meanwhile, in the drawing, the edge type method of arranging the LED assembly on one side of the light guide plate has been described. However, a plurality of LEDs are disposed below the liquid crystal panel to directly supply light to the liquid crystal panel. Direct type can also be applied. In this case, the light guide plate may be included in the backlight unit of the direct type.

The present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention.

110: liquid crystal panel 120: backlight unit
121: multiple optical sheets 123: light guide plate
125: reflector 129: LED assembly
130: support main 210: fastening protrusion
220: fastening groove 140: top cover
150: cover bottom 300: fixed protrusion
400: side reflection member

Claims (6)

A liquid crystal panel;
A backlight unit positioned on a rear surface of the liquid crystal panel;
A support main bordering an edge of the liquid crystal panel and the backlight unit;
A top cover coupled to the support main from the front of the liquid crystal panel;
A cover bottom coupled to the support main from the back of the backlight unit,
A plurality of fastening protrusions including fastening grooves are formed on at least one edge of the rear surface of the support main, and a plurality of fixing protrusions are inserted into each of the plurality of fastening grooves corresponding to the plurality of fastening protrusions on the front surface of the cover bottom. LCD is characterized in that the provided.
The method of claim 1,
The backlight unit
And a plurality of through holes corresponding to the plurality of fastening protrusions.
3. The method according to claim 1 or 2,
And a plurality of side reflecting members surrounding each of the plurality of fastening protrusions.
The method of claim 3,
And each of the plurality of side reflection members surrounds an outer surface of the outer surface of each of the plurality of fastening protrusions that comes into contact with at least one side of the light guide plate.
3. The method according to claim 1 or 2,
The backlight unit
And an LED assembly, a light guide plate facing at least one side of the LED assembly, and a plurality of optical sheets positioned on the light guide plate.
3. The method according to claim 1 or 2,
The backlight unit
A plurality of LED assemblies including a plurality of LEDs arranged on the cover bottom, a reflecting plate positioned on the upper portion of the plurality of LEDs, a diffuser plate disposed on the upper portion of the reflecting plate, and a plurality of LEDs positioned on the diffuser plate. Liquid crystal display comprising the optical sheets of.

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