KR101827970B1 - backlight unit and display apparatus for using the same - Google Patents

Abstract

A backlight unit having a reflecting portion, comprising: a light source module in which at least one light source is disposed on each of an upper surface, a left surface, and a right surface to emit light in a plurality of directions; a reflector disposed at a lower portion of the light source module; And an optical sheet that is disposed apart from the upper surface of the light source module and transmits light that is emitted from the light source module or reflected from the reflection portion.

Description

BACKLIGHT UNIT AND DISPLAY APPARATUS USING THE SAME

The embodiment relates to a backlight unit having a reflecting portion and a display using the same.

Typically, typical large-sized display devices include a liquid crystal display (LCD), a plasma display panel (PDP), and the like.

Unlike a self-luminous PDP, a backlight unit is indispensable because of the absence of its own light emitting device.

The backlight unit used in the LCD is divided into an edge type backlight unit and a direct-type backlight unit according to the position of the light source. In the edge type, a light source is disposed on the right and left sides or upper and lower sides of the LCD panel, Since the light is uniformly distributed over the surface, uniformity of light is good and the thickness of the panel can be made very thin.

The direct-type method is generally used for a display having a size of 20 inches or more. Since the light source is disposed at a lower portion of the panel, the light efficiency is higher than that of the edge type.

CCFL (Cold Cathode Fluorescent Lamp) is used as a light source of the backlight unit of the conventional edge method or direct-down type.

However, since the backlight unit using CCFL is always supplied with power to the CCFL, a considerable amount of power is consumed, and a color reproduction ratio of about 70% as compared with CRT and environmental pollution problems caused by the addition of mercury are pointed out as disadvantages.

BACKGROUND ART [0002] As a substitute product for solving the above problem, researches on a backlight unit using an LED (Light Emitting Diode) have been actively conducted.

When the LED is used as a backlight unit, it is possible to locally turn on / off the LED array, thereby dramatically reducing power consumption. In the case of the RGB LED, the LED is over 100% of the National Television System Committee (NTSC) So that a more vivid image quality can be provided to the consumer.

In addition, the LED manufactured by the semiconductor process is characterized by being harmless to the environment.

Currently, LCD products employing LEDs having the above advantages are being marketed extensively. However, since the conventional CCFL light source is different from the driving mechanism, driving drivers and PCB substrates are expensive.

Therefore, the LED backlight unit is only applied to expensive LCD products.

Embodiments provide a backlight unit capable of positioning a light source module that emits light in a plurality of directions in an air gap between an optical sheet and a reflector to provide light of uniform brightness and simplify the structure and a display device using the same I want to.

The light source module includes a light source module having at least one light source disposed on each of an upper surface, a left surface, and a right surface to emit light in a plurality of directions, a reflector disposed at a lower portion of the light source module, And an optical sheet that is disposed and which emits light from the light source module or transmits light reflected from the reflection portion.

Here, the lower surface of the light source module may be in contact with the reflective portion.

The upper surface of the light source module may have a larger area than the lower surface of the light source module, and the upper surface of the light source module may have the same area as at least one surface of the left, right, and lower surfaces of the light source module.

In addition, the left and right sides of the light source module may have different areas, and the angle between the lower surface and the left side surface of the light source module and the angle between the lower surface and the right side surface of the light source module may be the same or different from each other .

At least one of the upper surface, the left surface, and the right surface of the light source module may be any one of a flat surface, a concave surface, and a convex surface, and at least one of the upper surface, And a light source may be located on the projection.

At least one of the upper surface, the left surface, and the right surface of the light source module has at least a sloped surface, and the sloped surface may be located at the periphery of the light source. The left and right ends of the upper surface, and each wing may cover a light source disposed on a right side surface and a left side surface of the light source module.

The light sources arranged on the upper surface of the light source module and the light sources arranged on the left and right side surfaces of the light source module may be arranged in parallel to each other or alternately arranged.

The light source disposed on the upper surface of the light source module may have a lower intensity of light output than the light source disposed on the left and right sides of the light source module, But may be smaller than the number of light sources arranged on the right side.

The light source disposed on the upper surface of the light source module generates light of the first color, the light source disposed on the left surface of the light source module generates light of the second color, Three-color light can be generated.

Then, the inclined surface of the reflective portion may be a flat surface, a concave surface, or a convex surface, and the inclined surface of the reflective portion may be inclined at an angle of 1 to 85 degrees from a horizontal surface parallel to the surface of the optical sheet.

The optical sheet may include a light shielding pattern for blocking a part of the light from the light source.

Here, as the distance from the light source module is larger, the size of the light shielding pattern decreases and the distance between the adjacent light shielding patterns can be distanced. As the distance between the light shielding pattern and the light source module increases, The distance between the adjacent light shielding patterns may be distant from each other, and as the distance from the light source module increases, the size of the light shielding pattern decreases and the distance between adjacent light shielding patterns may be constant .

Further, the optical sheet may have a concavo-convex pattern on its upper surface.

The embodiments can position the light source module that emits light in a plurality of directions in the air gap between the optical sheet and the reflector so as to uniformly reflect the light of the light source upwardly to provide uniform brightness, Is not required.

Therefore, the manufacturing cost of the backlight unit is low, the overall weight is light, the uniform brightness can be provided, and the economical and reliability of the backlight unit can be improved.

Figs. 1A and 1B are views for explaining a backlight unit according to an embodiment
FIGS. 2A to 2E are cross-sectional views illustrating the light source module of FIG.
3A to 3C are views showing the shape of the upper surface according to the light source module of FIG. 1
4A to 4C are views showing the shape of a side surface according to the light source module of FIG. 1
FIGS. 5A and 5B are views showing another embodiment showing the light source module of FIG. 1
6A and 6B are diagrams showing the arrangement states of the light sources arranged in the light source module of FIG.
Figs. 7A to 7C are views showing an inclined surface according to the reflection portion of Fig. 1
Figs. 8A and 8B are views showing a cover frame for supporting the light source module and the reflecting portion of Fig. 1
9A to 9C are views showing the shape of a cover frame to which the reflector is attached
FIGS. 10A to 10D are views showing a reflection section having a reflection pattern
11A to 11C are cross-sectional views showing the arrangement of the shielding patterns
12 is a view showing a concavo-convex pattern of the optical sheet
13 is a view showing a display module having a backlight unit according to the present embodiment
14 and 15 are views showing a display device according to the present embodiment

Hereinafter, embodiments will be described with reference to the accompanying drawings.

In the description of the embodiments, it is to be understood that each layer (film), region, pattern or structure is formed "on" or "under" a substrate, each layer The terms " on "and " under " encompass both being formed" directly "or" indirectly " In addition, the criteria for above or below each layer will be described with reference to the drawings.

The thickness and size of each layer in the drawings are exaggerated, omitted, or schematically shown for convenience and clarity of explanation. Also, the size of each component does not entirely reflect the actual size.

1A and 1B are views for explaining a backlight unit according to an embodiment, wherein FIG. 1A is a sectional view and FIG. 1B is a perspective view.

As shown in FIGS. 1A and 1B, the backlight unit may include a light source module 100, a reflection unit 200, and an optical sheet 300.

At least one light source 110 may be disposed on the upper surface, the left surface, and the right surface of the light source module 100 to emit light in a plurality of directions. The reflector 200 may be disposed at a lower portion of the light source module 100 And may have an inclined surface in at least one of a left direction and a right direction of the light source module 100.

In some cases, the reflector 200 may be disposed in a plane shape without a slope on the lower part of the light source module 100.

The optical sheet 300 is spaced apart from the upper surface of the light source module 100 and can transmit light emitted from the light source module 100 or reflected from the reflection portion 200.

Here, the light source module 100 may be a direct lower type positioned within an air gap between the reflective portion 200 and the optical sheet 300.

The light source module 100 includes a module substrate 120 having an upper surface, a lower surface, a left surface, and a right surface, at least one light source 110 disposed on the upper surface, left surface, and right surface of the module substrate 120, . ≪ / RTI >

At this time, at least one light source 110 may be arranged on the upper surface, the right surface, and the left surface of the module substrate 120, and an electrode pattern for connecting the adapter supplying power and the light source 110 may be formed .

For example, a carbon nanotube electrode pattern may be formed on the module substrate 120 to connect the light source 110 and the adapter.

The module substrate 120 may be a printed circuit board (PCB) on which a plurality of light sources 100 are mounted, such as polyethylene terephthalate (PET), glass, polycarbonate (PC) And may be formed in a film form.

The light source 110 may be a light emitting diode (LED) chip. The light emitting diode chip may be a blue LED chip or an ultraviolet LED chip, or may be a red LED chip, a green LED chip, a blue LED chip, ) LED chip, or a white LED chip.

The white LED may be implemented by combining a yellow phosphor on a blue LED or by simultaneously using a red phosphor and a green phosphor on a blue LED.

In addition, the light sources 110 disposed on the upper surface and the left / right surface of the module substrate 120 may all have the same light output intensity, but may have different light output intensities in some cases.

Most preferably, the light source 110 disposed on the upper surface of the module substrate 120 has a lower intensity of light output than the light source disposed on the left / right surface of the module substrate 120.

This is because the hot spot phenomenon may occur because the light source 110 disposed on the upper surface of the module substrate 120 is disposed adjacent to the optical sheet 300.

Accordingly, the light source 110 disposed on the upper surface of the module substrate 120 preferably has the lowest light output intensity.

The light source 110 disposed on the upper surface of the module substrate 120 generates light of the first color and the light source 110 disposed on the left surface of the module substrate 120 generates light of the second color And the light source 110 disposed on the right side of the module substrate 120 may generate light of the third color.

In some cases, the colors of the light sources 110 disposed on the module substrate 120 may be all the same.

The light sources 110 disposed on the upper surface and the left and right side surfaces of the module substrate 120 may all have the same number of light sources 110. In some cases, .

Most preferably, the number of the light sources 110 disposed on the upper surface of the module substrate 120 is smaller than the number of the light sources 110 disposed on the left and right surfaces of the module substrate 120.

This is because the hot spot phenomenon may occur because the light source 110 disposed on the upper surface of the module substrate 120 is disposed adjacent to the optical sheet 300.

Therefore, it is preferable to arrange the least number of the light sources 110 disposed on the upper surface of the module substrate 120.

As described above, the light source module 100 in which the light sources 110 are arranged may be arranged such that the lower surface thereof is in contact with the reflector 200, and the left and right surfaces of the light source module 100 It can be arranged so as to face the inclined surface.

FIGS. 2A to 2E are cross-sectional views illustrating various embodiments of the light source module of FIG. 1A. Referring to FIG.

2A shows a structure in which the upper surface 126 of the module substrate 120 is larger in area than the lower surface of the module substrate 120. [

Accordingly, the left side surface 122 and the right side surface 124 of the module substrate 120 can be formed to be inclined with respect to the lower surface.

Here, the angle? 1 between the left surface 122 and the lower surface 122 of the module substrate 120 and the angle? 2 between the right surface 124 and the lower surface 124 of the module substrate 120 are obtuse and the same.

At this time, the angle? 1 and the angle? 2 may be about 90 - 135 degrees.

2B shows a structure in which the upper surface 126 of the module substrate 120 is larger in area than the lower surface of the module substrate 120 and the left surface 122 of the module substrate 120 is in contact with the lower surface It can be formed obliquely.

Here, the angle [theta] 1 between the left surface 122 and the lower surface of the module substrate 120 is an obtuse angle, and the angle [theta] 2 between the right surface 124 and the lower surface of the module substrate 120 may be right angles.

2C shows a structure in which the upper surface 126 of the module substrate 120 has a larger area than the lower surface of the module substrate 120 and the right side surface 124 of the module substrate 120 is inclined with respect to the lower surface .

Here, the angle? 1 between the left side surface 122 and the lower surface 122 of the module substrate 120 is a right angle, and the angle? 2 between the right side surface 124 and the lower surface of the module substrate 120 may be an obtuse angle.

2D shows a structure in which the upper surface 126 of the module substrate 120 is larger in area than the lower surface of the module substrate 120 and the left side surface 122 and the right side surface 124 of the module substrate 120, May be formed obliquely with respect to the lower surface.

Here, the angle? 1 between the left surface 122 and the lower surface 122 of the module substrate 120 and the angle? 2 between the right surface 124 and the lower surface 124 of the module substrate 120 may be different from each other, can be larger than? 2.

At this time, the area of the left side surface 122 of the module substrate 120 may be larger than the area of the right side surface 124.

2E shows a structure in which the upper surface 126 of the module substrate 120 has a larger area than the lower surface of the module substrate 120 and the left side surface 122 and the right side surface 124 of the module substrate 120, May be formed obliquely with respect to the lower surface.

Here, the angle? 1 between the left side surface 122 and the lower surface 122 of the module substrate 120 and the angle? 2 between the right side surface 124 of the module substrate 120 and the lower surface may be different from each other, can be larger than? 1.

At this time, the area of the right side surface 124 of the module substrate 120 may be larger than the area of the left side surface 122.

In some cases, the upper surface 126 of the module substrate 120 may have the same area as at least one of the left surface 122, the right surface 124, and the lower surface of the module substrate 120 .

3A to 3C are views showing the shape of the upper surface according to the light source module of FIG.

The upper surface of the module substrate 120 of the light source module 100 may be a flat surface, but may be a concave curved surface or a convex curved surface.

As shown in FIG. 3A, a portion of the top surface 126 of the module substrate 120 may have an inclined surface 127.

Here, the inclined plane 127 is formed around the light source 110 and may be formed in the left and right directions of the light source 110.

The reason for forming the inclined surface 127 in this way is that the light output direction of the light source 110 disposed on the upper surface 126 of the module substrate 120 is widely diffused in the left / right direction.

3B, at least one protrusion 128 is formed on the upper surface 126 of the module substrate 120, and the light source 110 may be positioned on the protrusion 128. As shown in FIG.

The reason for forming the protrusions 128 in this manner is that the light output direction of the light source 110 disposed on the protrusions 128 is widely diffused in the left / right direction.

3C, the upper surface 126 of the module substrate 120 may be a convex curved surface.

The reason why the upper surface 126 of the module substrate 120 is formed as a convex curved surface is that the light emitting direction of the light source 110 disposed on the upper surface 126 of the module substrate 120 is in the left / As shown in FIG.

4A to 4C are views showing the shape of a side surface according to the light source module of FIG.

The left and right side surfaces 122 and 124 of the module substrate 120 of the light source module 100 may be a flat surface, but may be a concave curved surface or a convex curved surface.

As shown in FIG. 4A, the left and right side surfaces 122 and 124 of the module substrate 120 may be concave curved surfaces.

The reason why the left and right side surfaces 122 and 124 of the module substrate 120 are concave curved surfaces is that the light emitted from the light source 110 disposed on the left and right side surfaces 122 and 124 of the module substrate 120 Direction so as to spread widely in the left / right direction.

4b, at least one protrusion 123 and 125 are formed on the left and right side surfaces 122 and 124 of the module substrate 120 and the light source 110 is formed on the protrusions 123 and 125 Can be located.

The reason for forming the projections 123 and 125 in this way is to diffuse the light output direction of the light source 110 disposed on the projections 123 and 125 widely in the left and right directions.

Also, as shown in FIG. 4C, the left and right side surfaces 122 and 124 of the module substrate 120 may be convex curved surfaces.

The reason why the left and right side surfaces 122 and 124 of the module substrate 120 are formed in a convex curved surface is that the light emitted from the light source 110 disposed on the left and right side surfaces 122 and 124 of the module substrate 120 Direction so as to spread widely in the left / right direction.

As such, at least one of the upper surface 126, the left surface 122, and the right surface 124 of the module substrate 120 may be any one of planar, concave curved, and convex curved surfaces.

At least one of the upper surface 126, the left surface 122 and the right surface 124 of the module substrate 120 has at least one protrusion 123, 125, 128, and at least one of the protrusions 123, 125, 128 The light source 110 may be positioned above the light source 110.

5A and 5B are views illustrating a structure in which a side surface and a lower surface of the light source module are perpendicular to each other, according to another embodiment of the light source module of FIG.

5A, the angle [theta] 1 between the left side 122 and the bottom surface of the module substrate 120 and the angle [theta] 2 between the right side surface 124 and the bottom surface of the module substrate 120 may be perpendicular to each other , And the areas of the upper surface and the lower surface may be the same.

Alternatively, the upper surface 126, the lower surface, and the left / right surfaces 122 and 124 of the module substrate 120 may all have the same area.

5B, the angle? 1 between the left surface 122 and the lower surface of the module substrate 120 and the angle? 2 between the right surface 124 and the lower surface of the module substrate 120 are perpendicular to each other And wings 129 may be additionally formed at the left end and the right end of the upper surface 126 of the module substrate 120, respectively.

Each wing 129 may cover a light source 110 disposed on a right side surface 124 and a left side surface 122 of the module substrate 120.

The reflection films 130 may be formed on the lower surfaces of the wings 129 facing the light sources 110.

The reason for forming the wings 129 having the reflective film 130 in this way is that the light emitted from the light sources 110 disposed on the left and right side surfaces 122 and 124 of the module substrate 120 is reflected by the left / So that it can be widely spread in the direction.

FIGS. 6A and 6B are views showing the arrangement of light sources arranged in the light source module of FIG. 1. FIG.

The light sources 110 arranged on the upper surface 126 of the module substrate 120 and the light sources 110 arranged on the left and right surfaces 122 and 124 of the module substrate 120 Can be arranged side by side.

6B, the light source 110 arranged on the upper surface 126 of the module substrate 120 and the light source 110 arranged on the left and right surfaces 122 and 124 of the module substrate 120, May be staggered from each other.

The number of the light sources 110 disposed on the upper surface 126 of the module substrate 120 may be greater than the number of the light sources 110 disposed on the left and right surfaces 122 and 124 of the module substrate 120. [ It can be written down.

The light source 110 disposed on the upper surface 126 of the module substrate 120 has a smaller intensity of light output than the light source 110 disposed on the left and right surfaces 122 and 124 of the module substrate 120 It is possible.

Figs. 7A to 7C are views showing an inclined surface according to the reflective portion of Fig. 1, Fig. 7B is an embodiment in which the inclined surface is a plane, and Figs. 7A and 7C are embodiments in which the inclined surface is a curved surface.

7A, the inclined surface of the reflective portion 200 may be a concave surface, and an inclined surface of the reflective portion 200 may have an angle &thetas; 3 between horizontal surfaces parallel to the surface of the optical sheet 300, It can be gradually increased at 85 degrees.

7B, the inclined surface of the reflective portion 200 is planar, and the inclined surface of the reflective portion 200 has an angle? 4 between horizontal surfaces parallel to the surface of the optical sheet 300 of about 1 - 85 .

7C, the inclined surface of the reflective portion 200 may be a convex curved surface, and the inclined surface of the reflective portion 200 may have an angle &thetas; 5 between horizontal surfaces parallel to the surface of the optical sheet 300, It can be gradually reduced from 1 to 85 degrees.

As described above, the inclined surface of the reflective portion 200 may have a pattern in which at least a part of the inclination angle increases and then decreases, but may have a pattern in which the inclination angle of at least a part of the reflection portion 200 increases and then decreases or decreases.

8A and 8B are views showing a light source module of FIG. 1 and a cover frame supporting the reflector.

8A shows a cover frame 400 that supports the entire lower surface of the reflector 200. FIG. 8B shows the cover frame 400 that is formed in the same shape as that of the reflector 200, And a cover frame 400 for supporting the cover frame 400.

8A, the lower surface of the cover frame 400 supports the reflective portion 200 and the light source module 100, and the side surface of the cover frame 400 can support the optical sheet 300 .

At this time, the cover frame 400 may be a metal or a polymer resin.

In some cases, the lower surface and the side surface of the cover frame 400 may be made of the same material.

Here, the reflective portion 200 may be a reflective structure made of a reflective material.

Alternatively, the lower surface and the side surface of the cover frame 400 may be made of different materials.

In this case, the lower surface of the cover frame 400 may be formed in the same shape as the reflection portion 200 so as to have the same inclined surface as the reflection portion 200, as shown in FIG. 8B.

Therefore, the lower surface of the cover frame 400 can be individually manufactured using a polymer resin such as plastic, so that the lower surface of the cover frame 400 can be manufactured easily and easily in the same shape as the reflection portion 200.

In some cases, the reflector 200 may be formed to include a bottom plate having an inclined surface in the left and right directions of the light source module, and a reflective sheet formed on the inclined surface of the bottom plate.

Here, the reflective sheet may be formed on all or a part of the inclined surface of the bottom plate.

9A to 9C are views showing the shape of a cover frame to which a reflector is attached.

As shown in FIG. 9A, the total reflectance of the reflector 200 may be constant, but the total reflectance of the reflector 200 may not be constant.

The reflective portion 200 may be a reflective coating film made in the form of a film or a layer of a reflective coating material on which a reflective material is deposited.

The reflective portion 200 may include at least one of a metal or a metal oxide and may have a high reflectivity such as aluminum (Al), silver (Ag), gold (Ag), or titanium dioxide (TiO ₂ ) A metal or a metal oxide.

In this case, the reflective portion 200 may be formed by depositing or coating a metal or metal oxide on the polymer resin frame 400, which is a bottom plate, or may be formed by printing metal ink.

Here, as the deposition method, a vacuum deposition method such as a thermal deposition method, an evaporation method, or a sputtering method can be used. As the coating or printing method, a printing method, a gravure coating method, or a silk screen method can be used.

The reflector 200 may be formed in the form of a film or a sheet and adhered to the cover frame 400.

As shown in FIG. 8A, the reflector 200 may have the same reflectance over the entire cover frame 400 as shown in FIG. 8B, and the reflector 200 may have a different reflectance A plurality of reflective layers 210, 220, and 230 may be formed.

9A, the reflective portion 200 is formed of a plurality of reflective layers having different reflectivities. When only a reflective layer having the same reflectance is formed, the light reflectance of the entire reflective surface is not uniform, and the total brightness of the backlight This is because it can be uneven.

Therefore, a reflective layer having a relatively high reflectance is formed in the reflective surface area where the brightness of light is low, or a reflective layer having a relatively low reflectance is formed in the reflective surface area where the brightness of light is high, so that the entire brightness of the backlight is uniformly corrected .

FIG. 9B is a view showing a reflecting portion protruding on the surface of the cover frame, and FIG. 9C is a view showing a reflecting portion embedded in the surface of the cover frame.

9B and 9C are for uniformly correcting the entire brightness of the backlight by forming a reflection layer only on the reflection surface area where the brightness of light is low as shown in FIG. 9A.

The embodiment of FIG. 9B may be formed by protruding a reflective layer of the reflective portion 200 on a part of the surface of the cover frame 400. FIG.

9C is a structure in which a groove is formed on a part of the surface of the cover frame 400 and a reflection layer of the reflection portion 200 is filled in the groove.

In this way, the reflective portion 200 may be formed in the entire area of the cover frame 400, but may be formed only in a region where the brightness of the light is relatively low.

In some cases, the reflection portion 200 may have a predetermined reflection pattern on its surface.

10A to 10D are views showing a reflection portion having a reflection pattern.

10A and 10C show that the reflection pattern 250 has a saw tooth shape and the surface of the reflection pattern 250 has a curved surface shape. .

10B is a curved surface in which the surface of the reflection pattern 250 is concave, and FIG. 10C is a curved surface in which the surface of the reflection pattern 250 is convex.

10D, the size of the reflection pattern 250 may gradually increase from the end of the reflection portion 200 toward the center portion.

The reason why the reflective pattern 250 is formed on the reflective portion 200 is not only the reflection of the light but also the diffusion effect of uniformly spreading the light.

Accordingly, the reflection pattern 250 can be manufactured in various sizes in the corresponding region according to the entire luminance distribution of the backlight.

On the other hand, depending on the thickness and length of the reflective portion 200, the luminance uniformity of the backlight unit may be affected.

On the other hand, this embodiment may further form a light-shielding pattern on the optical sheet in addition to reducing the phenomenon of hot spot and for the uniformity of the overall luminance.

Here, the light-shielding pattern can reduce the brightness of the light emitted from the region adjacent to the light source, thereby allowing the backlight unit to emit light of uniform brightness.

11A to 11C are cross-sectional views showing the arrangement of the shielding pattern.

11A to 11C, the light shielding pattern 320 may be spaced apart from the reflective portion 200 and the upper portion of the light source module 100 to block a part of the light from the light source 110.

Here, the light shielding pattern 320 may be a single layer or a plurality of layers.

The width of the light shielding pattern 320 may be the same or smaller as the distance from the light emitting surface of the light source module 100 is larger.

Further, the thickness of the light shielding pattern 320 may be the same or smaller as the distance from the light emitting surface of the light source module 100 increases.

The light blocking pattern 320 may be formed of at least one of metal, Al, TiO2, SiO2, CaCO3, and ZnO.

In order to uniformly control the brightness of the light as a whole, the size and density of the light shielding pattern 320 may vary according to the distance from the light source module 100. [

The distance D1 between the light shielding patterns 320 gradually increases as the distance from the light source module 100 increases and the size W1 of the light shielding pattern 320 increases .

11B, the distance D1 between the light-shielding patterns 320 gradually increases as the distance from the light source module 100 increases and the size W1 of the light-shielding pattern 320 increases, Can be constant.

11C, the distance D1 between the light-shielding patterns 320 is constant and the size W1 of the light-shielding pattern 320 is larger than the distance D1 between the light- It can be gradually decreased.

As described above, the light shielding patterns 320 arranged may be a single layer having different light transmittance for each region, or may be a plurality of layers.

The light-shielding patterns 320 formed in a plurality of layers may have different materials from each other.

As described above, the light shielding pattern 320 of the optical sheet may be formed under the diffusion layer which is a part of the optical sheet.

That is, a diffusion layer may be provided on the light-shielding pattern 320 so that light can be diffused upward. At this time, the diffusion layer may be directly bonded to the light-shielding pattern 320 or may be bonded using an additional bonding member .

Here, the diffusion layer diffuses the incident light to prevent the light from the light-shielding pattern 320 from being partially concentrated, thereby making the brightness of the light more uniform.

12 is a view showing a concavo-convex pattern of the optical sheet.

As shown in FIG. 12, the optical sheet 300 is for diffusing light to be emitted, and an irregular pattern 350 may be formed on the upper surface of the optical sheet 300 to increase the diffusion effect.

The concavo-convex pattern 350 may have a strip shape disposed along the light source module 100.

At this time, the concavo-convex pattern 350 has protrusions on the surface of the optical sheet 300, the protrusions consist of a first surface and a second surface facing each other, and an angle between the first surface and the second surface is an obtuse angle or an acute angle .

A driver circuit board 452 and a driver 450 for driving the light source module 100 including the light source 110 and the module substrate 120 may be disposed under the cover frame 400.

The driving circuit substrate 452 of the driving unit 450 and the module substrate 120 of the light source module 100 may be electrically connected by a circuit connecting portion 454 passing through the cover frame 400.

13 is a view showing a display module having a backlight unit according to the present embodiment.

As shown in FIG. 13, the display module 20 may include a display panel 800 and a backlight unit 700.

The display panel 800 includes a color filter substrate 810 and a TFT (Thin Film Transistor) substrate 820 bonded to each other so as to maintain a uniform cell gap, and between the two substrates 810 and 820 A liquid crystal layer (not shown) may be interposed.

The color filter substrate 810 includes a plurality of pixels composed of red (R), green (G), and blue (B) subpixels and generates images corresponding to red, green, .

The pixels may be composed of red, green, and blue subpixels, but the red, green, blue, and white (W) subpixels constitute one pixel.

The TFT substrate 820 can switch a pixel electrode (not shown) as an element in which switching elements are formed.

For example, the common electrode (not shown) and the pixel electrode can change the arrangement of molecules in the liquid crystal layer according to a predetermined voltage applied from outside.

The liquid crystal layer is composed of a plurality of liquid crystal molecules, and the liquid crystal molecules change their arrangement in accordance with the voltage difference generated between the pixel electrode and the common electrode.

Thereby, the light provided from the backlight unit 700 can be incident on the color filter substrate 810 in accordance with the change of the molecular arrangement of the liquid crystal layer.

The upper polarizer 830 and the lower polarizer 840 may be disposed on the upper and lower sides of the display panel 800 and more specifically the upper polarizer 830 may be disposed on the upper surface of the color filter substrate 810 And the lower polarizer 840 may be disposed on the lower surface of the TFT substrate 820.

Although not shown, a gate and a data driver for generating a driving signal for driving the panel 800 may be provided on a side of the display panel 800.

As shown in FIG. 13, the display module may be configured by placing a backlight unit 700 in close contact with the display panel 800.

For example, the backlight unit 700 may be adhered and fixed to the lower surface of the display panel 800, more specifically, the lower polarizer plate 840, and between the lower polarizer plate 840 and the backlight unit 700 An adhesive layer (not shown) may be formed.

By forming the backlight unit 700 in close contact with the display panel 800 as described above, it is possible to improve the appearance by reducing the overall thickness of the display device, and the additional structure for fixing the backlight unit 700 can be removed So that the structure and manufacturing process of the display device can be simplified.

In addition, by removing the space between the backlight unit 700 and the display panel 800, it is possible to prevent a malfunction of the display device or deterioration of the image quality of the display image due to the infiltration of foreign matter into the space.

The backlight unit 700 according to an exemplary embodiment of the present invention may be configured such that a plurality of functional layers are stacked, and at least one of the plurality of functional layers may include a plurality of light sources (not shown) have.

The plurality of functional layers constituting the backlight unit 700, more specifically, the backlight unit 700, are each flexible so that the backlight unit 700 is closely attached to the lower surface of the display panel 800 and fixed. ). ≪ / RTI >

The display panel 800 according to an exemplary embodiment of the present invention may be divided into a plurality of regions and may be divided into a plurality of regions corresponding to a gray peak value or a color coordinate signal of each of the divided regions from a corresponding region of the backlight unit 700 The brightness of the emitted light, that is, the brightness of the light source, can be adjusted, so that the brightness of the display panel 800 can be adjusted.

To this end, the backlight unit 700 may be divided into a plurality of divided driving regions corresponding to the divided regions of the display panel 800 and operated.

14 and 15 are views showing a display device according to the present embodiment.

14, the display device 1 includes a display module 20, a front cover 30 and a back cover 35 surrounding the display module 20, a driving unit 55 provided in the back cover 35, And a driving unit cover 40 surrounding the driving unit 55.

The front cover 30 may include a front panel (not shown) made of a transparent material transmitting light. The front panel may protect the display module 20 at regular intervals, and light emitted from the display module 20 So that an image displayed on the display module 20 is displayed from the outside.

Further, the front cover 30 can be made of a flat plate without the window 30a.

In this case, the front cover 30 is made of a transparent material that transmits light, for example, an injection-molded plastic.

Thus, if the front cover 30 is formed as a flat plate, the frame can be removed from the front cover 30. [

The back cover 35 can be coupled with the front cover 30 to protect the display module 20.

A driving unit 55 may be disposed on one side of the back cover 35.

The driving unit 55 may include a driving control unit 55a, a main board 55b, and a power supply unit 55c.

The driving control unit 55a may be a timing controller and is a driving unit for adjusting the operation timing of each driver IC of the display module 20. The main board 55b may include a V-sync, an H- B resolution signal, and the power supply unit 55c is a driving unit for applying power to the display module 20. [

The driving part 55 may be provided on the back cover 35 and may be surrounded by the driving part cover 40.

The back cover 35 may include a plurality of holes to connect the display module 20 and the driving unit 55 and a stand 60 for supporting the display device 1.

15, the driving control unit 55a of the driving unit 55 is provided in the back cover 35, and the main board 55b and the power board 55c may be provided in the stand 60 have.

The driving unit cover 40 may cover only the driving unit 55 provided on the back cover 35.

Although the main board 55b and the power board 55c are separately formed in the present embodiment, they may be formed as one integrated board, but are not limited thereto.

The features, structures, effects and the like described in the embodiments are included in at least one embodiment of the present invention and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects and the like illustrated in the embodiments can be combined and modified by other persons skilled in the art to which the embodiments belong. Therefore, it should be understood that the present invention is not limited to these combinations and modifications.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of illustration, It can be seen that various modifications and applications are possible. For example, each component specifically shown in the embodiments can be modified and implemented. It is to be understood that all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims (29)

A module substrate comprising a lower surface, an upper surface having a larger area than the lower surface, a left side and a right side; And a light source module including at least one light source disposed on an upper surface, a left surface, and a right surface, respectively, of the module substrate;
A reflector disposed under the light source module;
An optical sheet disposed apart from an upper surface of the light source module and transmitting light emitted from the light source module or reflected from the reflection portion; And
And a shielding pattern disposed below the optical sheet and shielding a part of the light from the light source,
Wherein the reflective portion has an inclined surface at least partially inclined from a horizontal plane parallel to the surface of the optical sheet,
Wherein each of a left side surface and a right side surface of the light source module has an oblique inclined surface inclined at an obtuse angle with respect to a lower surface and is disposed to face an inclined surface of the reflective portion,
The number of light sources disposed on the upper surface of the light source module is smaller than the number of light sources disposed on the left and right sides of the light source module,
Wherein the light shielding pattern has a constant size of the light shielding pattern and a distance between the adjacent light shielding patterns is increased as the distance from the light source module increases. The display device of claim 1, wherein a lower surface of the light source module is in contact with the reflective portion. The display device according to claim 1 or 2, wherein the angle between the lower surface and the left surface of the light source module and the angle between the lower surface and the right surface of the light source module are equal to each other. 3. The display device according to claim 1 or 2, wherein the angle between the lower surface and the left surface of the light source module is different from the angle between the lower surface and the right surface of the light source module. The display device according to claim 1, wherein at least one of an upper surface, a left surface, and a right surface of the light source module is any one of a plane surface, a concave surface, and a convex surface. The display device of claim 1, wherein at least one of an upper surface, a left surface, and a right surface of the light source module has at least one protrusion, and the light source is located on the protrusion. The display device of claim 1, wherein at least one of an upper surface, a left surface, and a right surface of the light source module has an inclined surface at least partially, and the inclined surface is located around the light source. The light source module according to claim 1, wherein a wing is formed at a left end and a right end of an upper surface of the light source module, each wing covers a light source disposed on a right side surface and a left side surface of the light source module,
And a reflective film is formed on a lower surface of each of the wings. delete The display device according to claim 1, wherein the light source arranged on the upper surface of the light source module and the light sources arranged on the left / right side surface of the light source module are arranged in parallel to each other. The display device according to claim 1, wherein the light sources arranged on the upper surface of the light source module and the light sources arranged on the left and right side surfaces of the light source module are staggered from each other. delete The light source module according to any one of claims 1 and 6 to 8, wherein the light source disposed on the upper surface of the light source module generates light of the first color, Wherein the light source generates light of two colors, and the light source disposed on the right side of the light source module generates light of the third color. delete delete The optical device according to claim 1 or 2, wherein the inclined surface of the reflective portion is any one of a flat surface, a concave surface, and a convex surface,
Wherein the inclined surface of the reflective portion is inclined at an angle of 1 to 85 degrees from a horizontal surface parallel to the surface of the optical sheet. delete The display device according to claim 1, further comprising a cover frame for supporting the reflective portion and the light source module. 2. The display device according to claim 1,
A bottom plate at least partially having an inclined surface;
And a reflective sheet formed in accordance with an inclined surface shape of the bottom plate. The display device according to claim 19, wherein the reflective sheet is formed on the whole or a part of the inclined surface. 20. The display device according to claim 19, wherein the reflective sheet has the same reflectance over the entire inclined surface or a part of the inclined surface has a different reflectance. 20. The display device according to claim 19, wherein the bottom plate has grooves formed on all or a part of the inclined surface, and the reflective sheet is formed in the grooves of the bottom plate. The display device according to claim 1, wherein a sawtooth-shaped reflection pattern is formed on the surface of the reflective portion, and the surface of the reflection pattern is planar or curved. delete delete delete delete The display device according to claim 1, wherein the optical sheet has a concavo-convex pattern on an upper surface thereof. delete

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