KR101854850B1 - backlight unit and display apparatus using the same - Google Patents

Abstract

A first reflector, a second reflector, and a light source module disposed between the first and second reflectors, wherein the second reflector includes a left region having a certain inclined surface, Area, and the slope of the left area and the slopes of the right area may be asymmetrical to each other.

Description

BACKLIGHT UNIT AND DISPLAY APPARATUS USING THE SAME

An embodiment relates to a backlight unit and a display device.

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 of 20 inches or more, and since the light source is arranged at a lower portion of the panel, the light efficiency is higher than that of the edge method. Thus, it is mainly used for a large display requiring high brightness.

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 partially turn on / off the LED array, thereby drastically reducing the power consumption. In the case of the RGB LED, the color reproduction range specification exceeding 100% of the National Television System Committee (NTSC) So that a more vivid image quality can be provided to the consumer.

1 is a sectional view showing a general backlight unit.

1, the backlight unit includes a light guide plate 2, a reflector 3, an optical member 4, a light source module 5, .

The backlight unit may further include a top chassis 6, a bottom chassis 7, and a panel guide module 8.

Here, the panel guide module 8 can support the display panel 9, and the top chassis 6 can be connected to the panel guide module 8 and the bottom chassis 7.

Next, the light guide plate 2 has a reflector 3 disposed on a lower surface thereof, and an optical member 4 disposed on an upper surface thereof.

Next, the light source module 5 includes a substrate 5b and a light source 5a arranged on the substrate 5b. The light source module 5 may be disposed on both sides of the light guide plate 2.

The backlight unit having such a structure can uniformly diffuse the light using the light guide plate 2, but the whole backlight unit is not only heavy because of the light guide plate 2, but also causes a rise in price.

Therefore, it will be necessary to develop a backlight unit capable of uniformly diffusing light even without the light guide plate 2 in the future.

An embodiment of the present invention is to provide a backlight unit having an air guide and a display device using the backlight unit by using a reflector having an asymmetric inclined surface without a light guide plate.

An embodiment includes a first reflector, a second reflector, and a light source module disposed between the first and second reflectors, wherein the second reflector includes a left region and a right region having some inclined surfaces, The sloped surface of the area and the sloped surface of the right area may be asymmetric with respect to each other.

Here, the area of the left side of the second reflector and the area of the right side of the second reflector may be different from each other.

The left side region of the second reflector includes first and second regions, the right side region of the second reflector includes third and fourth regions, and the first region is aligned with the light source module and the first reflector. And the second region is a second inclined surface which is adjacent to the first region and is inclined upward from the first region, the third region is adjacent to the second region, and the second region is adjacent to the second region, And the fourth region may be a fourth inclined surface aligned with the light source module and the first reflector and inclined upward from the third region adjacent to the third region.

Here, the first inclined surface is a curved surface having a first curvature, the second inclined surface is a curved surface having a second curvature, the third inclined surface is a curved surface having a third curvature, and the fourth inclined surface is a curved surface having a fourth curvature have.

Here, the first curvature may be different from the fourth curvature, and the second curvature may be different from the third curvature.

Further, the first inclined surface is a plane having a first inclination, the second inclined surface is a plane having a second inclination, the third inclined surface is a plane having a third inclination, and the fourth inclined surface is a plane having the fourth inclination have.

At this time, the first slope may be different from the fourth slope, and the second slope may be different from the third slope.

Next, the first inclined surface may be a curved surface having a predetermined curvature, the fourth inclined surface may be a plane having a predetermined inclination, or the first inclined surface may be a plane having a predetermined inclination, and the fourth inclined surface may be a curved surface having a predetermined curvature.

The second inclined surface may be a curved surface having a predetermined curvature, the third inclined surface may be a plane having a predetermined inclination, or the second inclined surface may be a plane having a predetermined inclination, and the third inclined surface may be a curved surface having a predetermined curvature.

The area of the first inclined plane may be different from the area of the fourth inclined plane, and the area of the second inclined plane may be different from the area of the third inclined plane.

Next, the first reflector disposed in the left area of the second reflector is partially overlapped with the second inclined surface of the second reflector, and the first reflector disposed in the right area of the second reflector completely overlaps the fourth inclined surface of the second reflector .

The light source module disposed in the left area of the second reflector may have a different light output intensity from the light source module disposed in the right area of the second reflector, The number of light sources may be different from that of the light source module disposed in the right region of the reflector.

The first reflector disposed in the left area of the second reflector may have a different width from the first reflector disposed in the right area of the second reflector.

By forming the reflector for an air guide having an asymmetric inclined surface without using the light guide plate, the embodiments can provide light with a low weight, low manufacturing cost, and uniform brightness.

In addition, the hot spot phenomenon can be reduced by manufacturing the left side region and the right side region of the reflector asymmetrically with each other

Therefore, the economical and reliability of the backlight unit can be improved.

1 is a cross-sectional view showing a typical backlight unit
2A and 2B are views for explaining a backlight unit of a two-edge type according to the embodiment
3A to 3D are views for explaining the arrangement relationship between the light source module and the first and second reflectors
4A and 4B are views showing a first reflector disposed in a left / right region of a second reflector
5A to 5D are views showing the inclined plane of the left region of the second reflector
6A to 6D are views showing asymmetrical slopes of the left and right regions of the second reflector
7 is a view showing an asymmetrical light source module in the left and right regions of the second reflector
8 is a view showing an asymmetrical first reflector of the left and right regions of the second reflector
9A to 9D are views showing a first reflector having an inclined plane
10A to 10D are views showing a first reflector having a reflection pattern
11 is a view showing a backlight unit in which an optical member is disposed
12 is a view showing a display module having a backlight unit according to an embodiment
13 and 14 are views showing a display device according to an 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.

2A and 2B are views for explaining a backlight unit of a two-edge type according to the embodiment, wherein FIG. 2A is a cross-sectional view and FIG. 2B is a plan view.

As shown in FIGS. 2A and 2B, the backlight unit may include a light source module 100, a first reflector 200, and a second reflector 300.

Here, the light source module 100 may be disposed between the first reflector 200 and the second reflector 300 and adjacent to the first reflector 200.

In some cases, the light source module 100 may be spaced apart from the second reflector 300 at the same time that the light source module 100 contacts the first reflector 200, or may be disposed at a distance from the first reflector 300 200 at regular intervals.

Alternatively, the light source module 100 may be spaced apart from the first reflector 200 and the second reflector 300, or may be in contact with the first reflector 200 and the second reflector 300 at the same time .

The light source module 100 may include a substrate having an electrode pattern and at least one light source disposed on the substrate.

Here, the light source of the light source module 100 may be a top view type light emitting diode.

In some cases, the light source may be a side view type light emitting diode.

The substrate may be a PCB (Printed Circuit Board) substrate made of any one material selected from polyethylene terephthalate (PET), glass, polycarbonate (PC), and silicon (Si), or may be formed into a film.

In addition, the substrate may be a single layer PCB, a multilayer PCB, a ceramic substrate, a metal core PCB, or the like.

Here, the substrate may be formed of one of the reflective coating film and the reflective coating material layer, and may reflect the light generated from the light source to the central region of the second reflector 300.

The light source may be an LED chip, and the light emitting diode chip may be a blue LED chip or an ultraviolet LED chip or a red LED chip, a green LED chip, a blue LED chip, a yellow green LED chip , And a white LED chip may be used.

The white LED may be realized by combining a yellow phosphor on a blue LED or by simultaneously using a red phosphor and a green phosphor on a blue LED, (Yellow phosphor), Red phosphor (Phosphor) and Green phosphor (Phosphor).

The first reflector 200 and the second reflector 300 are spaced apart from each other by a predetermined distance so as to have an air guide in an empty space between the first reflector 200 and the second reflector 300, have.

The first reflector 200 may be formed of one of a reflective coating film and a reflective coating material layer to reflect light generated from the light source module 100 toward the second reflector 300.

In addition, a sawtooth-shaped reflection pattern may be formed on the surface of the first reflector 200 facing the light source module 100, and the surface of the reflection pattern may be flat or curved.

The reason for forming the reflection pattern on the surface of the first reflector 200 is to reflect the light generated by the light source module 100 to the central region of the second reflector 300 so as to increase the brightness in the central region of the backlight unit to be.

Next, the second reflector 300 may include a left area having some inclined surfaces and a right area having some inclined surfaces.

Here, the slope of the left region and the slope of the right region may be asymmetric with respect to each other.

For example, the area of the left area and the area of the right area of the second reflector 300 may be different from each other with respect to the center line.

In some cases, the area of the left area of the second reflector 300 may be smaller than the area of the right area.

In addition, the left region of the second reflector 300 may include first and second regions, and the right region of the second reflector 300 may include third and fourth regions.

Here, the first region may be aligned with the light source module 100 and the first reflector 200 and may be a first inclined surface inclined downward, a second region adjacent to the first region, And may be a second inclined surface inclined upward from the region.

The third region may be a third inclined surface that is adjacent to the second region and inclined downward from the second region, the fourth region may be aligned with the light source module 100 and the first reflector 200, And a fourth inclined surface that is inclined from the third region to the upper direction adjacent to the third region.

Here, the first inclined surface is a curved surface having a first curvature R1, the second inclined surface is a curved surface having a second curvature R2, the third inclined surface is a curved surface having a third curvature R3, and the fourth inclined surface is a curved surface having a fourth curvature R4 .

Here, the first curvature R1 may be different from the fourth curvature R4.

For example, the first curvature R1 of the first inclined plane of the left region may be smaller than the fourth curvature R4 of the fourth inclined plane of the right region.

Also, the second curvature R2 may be different from the third curvature R3. For example, the second curvature R2 of the second sloped surface of the left region may be smaller than the third curvature R3 of the third sloped surface of the right region.

 In addition, at least one of the first, second, third, and fourth inclined surfaces may be a concave curved surface or a convex curved surface.

As described above, the area and the curvature of the sloped surface located in the left area of the second reflector 300 and the area and the curvature of the sloped surface located in the right area of the second reflector 300 can be formed asymmetrically with each other.

The reason why the left side region and the right side region of the second reflector 300 are formed asymmetrically with each other is that when the left side region and the right side region of the second reflector 300 are symmetrical to each other, (Hot spots).

Therefore, if the left side region and the right side region of the second reflector 300 are formed asymmetrically with each other, the hot spot phenomenon can be reduced.

Also, the first curvature R1 may be different from the second curvature R2. For example, the first curvature R1 of the first sloped surface of the left region may be smaller than the second curvature R2 of the second sloped surface of the left region.

The fourth curvature R4 may be different from the third curvature R3. For example, the fourth curvature R4 of the fourth inclined plane of the right region may be smaller than the third curvature R3 of the third inclined plane of the right region.

In some cases, the first inclined plane of the first region located in the left region of the second reflector 300 is a plane having the first inclination, and the second inclined plane of the second region located in the left region of the second reflector 300 The second inclined plane may be a plane having the second inclination and the third inclined plane of the third region located in the right region of the second reflector 300 is a plane having the third inclination, The fourth inclined surface of the fourth region located at the fourth inclination may be a plane having the fourth inclination.

Here, the first inclination of the first inclined plane may be different from the fourth inclination of the fourth inclined plane. For example, the first inclination of the first inclined plane of the left area is larger than the fourth inclination of the fourth inclined plane of the right area .

The second inclination of the second inclined plane may be different from the third inclination of the third inclined plane. For example, the second inclination of the second inclined plane of the left area is larger than the third inclination of the third inclined plane of the right area .

The first inclination of the first inclined plane may be different from the second inclination of the second inclined plane. For example, the first inclination of the first inclined plane of the left area is larger than the second inclination of the second inclined plane of the left area .

The fourth inclination of the fourth inclined surface may be different from the third inclination of the third inclined surface. For example, the fourth inclination of the fourth inclined surface of the right area is larger than the third inclination of the third inclined surface of the right area .

In addition, the area of the first inclined plane may be different from the area of the fourth inclined plane. For example, the area of the first inclined plane of the left area may be smaller than the area of the fourth inclined plane of the right area.

The area of the second inclined surface may be different from the area of the third inclined surface. For example, the area of the second inclined surface of the left area may be smaller than the area of the third inclined surface of the right area.

As described above, the first and second areas located in the left area of the second reflector 300 and the third area and the fourth area located in the right area of the second reflector 300 are inclined surfaces having different areas, curvatures, Lt; / RTI >

Therefore, by forming the left side region and the right side region of the second reflector 300 asymmetrically with each other, the hot spot phenomenon can be reduced.

On the other hand, a regular reflection sheet for regularly reflecting light can be formed in the first and fourth regions of the second reflector 300, and the second and third regions of the second reflector 300 can be formed of a regular reflection sheet, At least one of the diffusely reflecting sheet and the diffusely reflecting sheet may be formed.

The reason why the regular reflection sheet is formed in the first and fourth regions of the second reflector 300 is that it can provide a uniform brightness by reflecting a lot of light to the central region of the second reflector 300 with low brightness Because.

The reason why the diffusing sheet is formed in the second and third regions of the second reflector 300 is that the brightness can be compensated by diffusing the light in the second and third regions of the second reflector 300 having low brightness It is because.

The second reflector 300 may include a metal or metal oxide having a high reflectance such as aluminum (Al), silver (Ag), gold (Au), titanium dioxide (TiO ₂ ) The reflector 300 may have different materials formed in the first, second, third, and fourth regions, or may have different surface roughnesses in the first, second, third, and fourth regions.

That is, the first, second, third, and fourth regions of the second reflector 300 may be formed of the same material and have different surface roughnesses.

Alternatively, the first, second, third, and fourth regions of the second reflector 300 may be formed of different materials, and the surface roughness may be different from each other.

3A to 3D are views for explaining the arrangement relationship between the light source module and the first and second reflectors.

3A is a view showing a light source module 100 disposed at a predetermined distance from a first reflector 200 and a second reflector 300. FIG. 3B is a cross-sectional view of a first reflector 200 and a second reflector 300, FIG. 3C is a view showing a light source module 100 which is in contact with the first reflector 200 and is spaced apart from the second reflector 300 by a predetermined distance, FIG. 3D is a view showing the light source module 100 in contact with the first reflector 200, And a light source module 100 disposed at a predetermined distance from the first reflector 200 and contacting the second reflector 300. FIG.

3A, the light source module 100 may be spaced apart from the first reflector 200 by a first distance d1 and by a second distance d2 from the second reflector 300. As shown in FIG.

Here, the first distance d1 and the second distance d2 may be equal to each other, or may be different from each other.

As an example, the first distance d1 may be smaller than the second distance d2.

This is because, if the first distance d1 is larger than the second distance d2, a hot spot phenomenon may occur.

3B, the light source module 100 may be in contact with the first reflector 200 and the second reflector 300.

Here, the light source module 100 can prevent hot spots by contacting the first and second reflectors 200 and 300, and can transmit light to a region far from the light source module 100, and the thickness of the entire backlight unit .

3C, the light source module 100 may contact the first reflector 200 and may be spaced apart from the second reflector 300 by a distance d.

Here, the light source module 100 can prevent hot spot by contacting the first reflector 200, and can transmit light to a region far from the light source module 100.

Next, as shown in FIG. 3D, the light source module 100 may contact the second reflector 300 and be spaced apart from the first reflector 200 by a distance d.

4A and 4B are views showing a first reflector disposed in the left / right region of the second reflector.

As shown in Fig. 4A, the second reflector 300 may include a left area having an inclined surface and a right area having an inclined surface.

Here, the slope of the left region and the slope of the right region may be asymmetric with respect to each other.

For example, the area of the left area and the area of the right area of the second reflector 300 may be different from each other with respect to the center line.

In some cases, the area of the left area of the second reflector 300 may be smaller than the area of the right area.

In addition, the left region of the second reflector 300 may include first and second regions, and the right region of the second reflector 300 may include third and fourth regions.

Here, the first region may be aligned with the light source module 100 and the first reflector 200 and may be a first inclined surface inclined downward, a second region adjacent to the first region, And may be a second inclined surface inclined upward from the region.

The third region may be a third inclined surface that is adjacent to the second region and inclined downward from the second region, the fourth region may be aligned with the light source module 100 and the first reflector 200, And a fourth inclined surface that is inclined from the third region to the upper direction adjacent to the third region.

As described above, the light source module 100 and the first reflector 200 may be disposed in the first area of the left area of the second reflector 300 and the fourth area of the right area of the second reflector 300, respectively.

The first reflector 200 located in the left region of the second reflector 300 may be completely overlapped with the first region of the second reflector 300 and may be located in the right region of the second reflector 300 The first reflector 200 may be completely overlapped with the fourth region of the second reflector 300. [

That is, the first imaginary line extending from the end of the first reflector 200 located in the left region of the second reflector 300 toward the second reflector 300 is located in the first region of the second reflector 300 The first reflector 200 located in the left area of the second reflector 300 can be completely overlapped with the first area of the second reflector 300. [

The second imaginary line extending from the end of the first reflector 200 located in the right area of the second reflector 300 toward the second reflector 300 is positioned in the fourth area of the second reflector 300 The first reflector 200 located in the right area of the second reflector 300 can be completely overlapped with the fourth area of the second reflector 300. [

3B, the first reflector 200 located in the left region of the second reflector 300 may be partially overlapped with the second region of the second reflector 300, and the second reflector 300 may be partially overlapped with the second reflector 300. [ The first reflector 200 positioned in the right area of the second reflector 300 may be completely overlapped with the fourth area of the second reflector 300. [

That is, the first imaginary line extending from the end of the first reflector 200 located in the left area of the second reflector 300 toward the second reflector 300 is located in the second area of the second reflector 300 The first reflector 200 located in the left area of the second reflector 300 may partially overlap the second area of the second reflector 300. [

The second imaginary line extending from the end of the first reflector 200 located in the right area of the second reflector 300 toward the second reflector 300 is positioned in the fourth area of the second reflector 300 The first reflector 200 located in the right area of the second reflector 300 can be completely overlapped with the fourth area of the second reflector 300. [

As described above, the first reflector 200 located in the left area of the second reflector 300 and the first reflector 200 located in the right area of the second reflector 300 may be disposed asymmetrically with respect to each other.

5A to 5D are views showing the inclined surfaces of the left region of the second reflector.

5A, the left region of the second reflector 300 may include a first region and a second region. The first region may be aligned with the light source module 100 and the first reflector 200, ), And may be a first inclined surface inclined downward.

The second region may be a second inclined surface that is adjacent to the second region and inclined upward from the second region.

Here, the first inclined surface of the first region may be a curved surface having the first curvature R1, the second inclined surface of the second region may be a curved surface having the second curvature R2, and the first and second curvatures R1 and R2 may be different It is possible.

In some cases, at least one of the first and second inclined surfaces may be a concave curved surface or a convex curved surface.

5B, the left area of the second reflector 300 may include first and second areas, and the first area may be aligned with the light source module 100 and the first reflector 200, and may be a first inclined surface inclined downward.

The second region may be a second inclined surface that is adjacent to the second region and inclined upward from the second region.

Here, the first inclined surface of the first region may be a plane having a predetermined inclination, and the second inclined surface of the second region may be a curved surface having a predetermined curvature.

5C, the left area of the second reflector 300 may include a first area and a second area. The first area may be arranged in alignment with the light source module 100 and the first reflector 200, and may be a first inclined surface inclined downward.

The second region may be a second inclined surface that is adjacent to the second region and inclined upward from the second region.

Here, the first inclined surface of the first region may be a curved surface having a predetermined curvature, and the second inclined surface of the second region may be a plane having a predetermined inclination.

5D, the left area of the second reflector 300 may include first and second areas, and the first area may be aligned with the light source module 100 and the first reflector 200, and may be a first inclined surface inclined downward.

The second region may be a second inclined surface that is adjacent to the second region and inclined upward from the second region.

Here, the first inclined plane may be a plane having a first inclination, the second inclined plane may be a plane having a second inclination, and the first and second inclination may be different from each other.

On the other hand, the right area of the second reflector 300 may include third and fourth areas, which are the same as the left area of the second reflector 300 shown in FIGS. 5A to 5D, and a detailed description thereof will be omitted .

6A to 6D are views showing asymmetrical slopes of the left and right regions of the second reflector.

As shown in FIG. 6A, the second reflector 300 may include a left area having an inclined surface and a right area having an inclined surface.

Here, the left region of the second reflector 300 may include first and second regions, and the right region of the second reflector 300 may include third and fourth regions.

The first region may be aligned with the light source module 100 and the first reflector 200 and may be a first inclined surface inclined downward. The second region may be adjacent to the first region, And may be a second inclined surface inclined upward from the region.

The third region may be a third inclined surface that is adjacent to the second region and inclined downward from the second region, the fourth region may be aligned with the light source module 100 and the first reflector 200, And a fourth inclined surface that is inclined from the third region to the upper direction adjacent to the third region.

Here, the first inclined surface of the first region may be a curved surface having the first curvature R1, the second inclined surface of the second region may be a curved surface having the second curvature R2, and the first and second curvatures R1 and R2 may be different It is possible.

The fourth inclined plane of the fourth region may be a plane having the fourth inclination, the third inclined plane of the third region may be a plane having the third inclination, and the third and fourth inclination may be different from each other.

Next, as shown in FIG. 6B, the first inclined surface of the first region may be a curved surface having a predetermined curvature, and the second inclined surface of the second region may be a plane having a predetermined inclination.

The fourth inclined surface of the fourth region may be a plane having a predetermined inclination, and the third inclined surface of the third region may be a curved surface having a predetermined curvature.

Next, as shown in FIG. 6C, the first inclined surface of the first region may be a plane having a predetermined inclination, and the second inclined surface of the second region may be a curved surface having a predetermined curvature.

The fourth inclined surface of the fourth region may be a curved surface having a predetermined curvature, and the third inclined surface of the third region may be a plane having a predetermined inclination.

6D, the first inclined surface of the first region may be a plane having the first inclination, the second inclined plane of the second region may be a plane having the second inclination, and the first and second inclination planes May be different from each other.

The fourth inclined surface of the fourth region may be a curved surface having the fourth curvature R4, the third inclined surface of the third region may be a curved surface having the third curvature R3, and the third and fourth curvatures R3 and R4 may be different It is possible.

As described above, since the left and right regions of the second reflector have asymmetric inclined surfaces, the hot spot phenomenon in which light is concentrated in a predetermined area can be reduced.

7 is a view showing an asymmetrical light source module in the left and right regions of the second reflector.

As shown in Fig. 7, the second reflector 300 may include a left area having a slope and a right area having a slope.

Here, the left region of the second reflector 300 may include first and second regions, and the right region of the second reflector 300 may include third and fourth regions.

The light source module 100 may be disposed in a first region located in a left region of the second reflector 300 and a fourth region located in a right region of the second reflector 300. [

Here, the light source module 100 disposed in the left area of the second reflector 300 may have different optical output intensities from the light source module 100 disposed in the right area of the second reflector 300.

For example, if the light output intensity of the light source module 100 disposed in the left area of the second reflector 300 is smaller than the light output intensity of the light source module 100 disposed in the right area of the second reflector 300 .

Therefore, the light source module 100 disposed in the left area of the second reflector 300 can use a light source having a lower light output intensity than the light source module 100 disposed in the right area of the second reflector 300.

The light source module 100 disposed in the left area of the second reflector 300 may have a different number of light sources than the light source module 100 disposed in the right area of the second reflector 300. [

For example, the light source module 100 disposed in the left area of the second reflector 300 may use a smaller number of light sources than the light source module 100 disposed in the right area of the second reflector 300.

The light source module 100 may include a substrate 102 and at least one light source 101 disposed on the substrate 102. The light source module 100 disposed in the left region of the second reflector 300 May be smaller than the number of the light sources 101 of the light source module 100 disposed in the right area of the second reflector 300. [

8 is a view showing an asymmetrical first reflector of the left / right region of the second reflector.

As shown in Fig. 8, the second reflector 300 may include a left area having an inclined surface and a right area having an inclined surface.

Here, the left region of the second reflector 300 may include first and second regions, and the right region of the second reflector 300 may include third and fourth regions.

The light source module 100 may be disposed in a first region located in a left region of the second reflector 300 and a fourth region located in a right region of the second reflector 300. [

The first reflector 200 disposed on the left side of the second reflector 300 may have a different width from the first reflector 200 disposed on the right side of the second reflector 300.

For example, the width W1 of the first reflector 200 disposed in the left area of the second reflector 300 is smaller than the width W2 of the first reflector 200 disposed in the right area of the second reflector 300 .

9A to 9D are views showing a first reflector having an inclined surface, wherein FIG. 9A shows a case where the inclined plane is plane, and FIGS. 9B, 9C and 9D show cases where the inclined plane is curved.

9A to 9D, one surface of the first reflector 200 facing the second reflector 300 may have an inclined surface inclined at a predetermined angle with respect to the other surface of the first reflector 200 have.

Here, the inclination angle? Of the inclined plane may be inclined at an angle of 1 to 85 degrees with respect to a horizontal plane parallel to the other surface of the first reflector 200.

Therefore, the thickness of the first reflector 200 may gradually decrease as the distance from the light source module 100 increases, or may gradually increase.

That is, the thickness t1 of the first reflector 200 adjacent to the light source module 100 may be different from the thickness t2 of the area farther from the light source module 100. As shown in FIGS. 9A and 9B, May be greater than the thickness t2 of the region distant from the light source module 100. In this case,

In some cases, the thickness t1 of the region adjacent to the light source module 100 may be smaller than the thickness t2 of the region far from the light source module 100, as shown in Figs. 9C and 9D.

Further, as shown in FIG. 9D, the first reflector 200 may include both the inclined plane and the plane.

That is, in the first reflector 200, an area adjacent to the light source module 100 may have an inclined surface, and an area far from the light source module 100 may have a plane.

Here, the length L1 of the inclined plane may be the same as the length L2 of the plane, or may be different from each other in some cases.

A predetermined reflection pattern may be formed on the surface of the first reflector 200.

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

10A and 10C show that the reflective pattern 220 has a sawtooth shape and the reflective pattern 220 has a surface having a curved surface. .

Here, FIG. 10B shows a concave curved surface of the reflective pattern 220, and FIG. 10C shows a convex curved surface of the reflective pattern 220.

10D, the size of the reflection pattern 220 may gradually increase from the end of the first reflector 200 toward the open region.

The reason why the reflection pattern 220 is formed on the first reflector 200 in this way is not only reflection of the light but also diffusion effect that uniformly spreads the light.

Accordingly, the reflective pattern 220 can be manufactured in various sizes in the corresponding region according to the entire luminance distribution of the backlight.

11 is a view showing a backlight unit in which an optical member is disposed.

As shown in FIG. 11, the optical member 600 may be disposed at a predetermined interval from the second reflector 300.

An air guide may be formed in a space between the second reflector 300 and the optical member 600.

Here, the optical member 600 may have a concave-convex pattern 620 on its upper surface.

The optical member 600 is for diffusing light emitted from the light source module 100 and may have a concave-convex pattern 620 formed on its upper surface to increase the diffusion effect.

That is, the optical member 600 may have a plurality of layers, and the concave-convex pattern 620 may have a top surface or a surface of any one layer.

The concavity and convexity pattern 620 may have a strip shape disposed along the light source module 100.

At this time, the concave-convex pattern 620 has a protrusion on the surface of the optical member 600, the protrusion is composed 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 .

Optionally, the optical member 600 is made of at least one sheet, and may optionally include a diffusion sheet, a prism sheet, a brightness enhancement sheet, and the like.

Here, the diffusion sheet diffuses the light emitted from the light source, and the prism sheet guides the diffused light to the light emitting area, and the brightness diffusion sheet strengthens the brightness.

In addition, the second reflector 300 may comprise at least one of a metal or metal oxide, e.g., aluminum (Al), silver (Ag), gold (Au) or titanium dioxide (TiO ₂₎ and high as And a metal or metal oxide having reflectance.

The second reflector 300 may be formed of one of a reflective coating film and a reflective coating material layer and may reflect the light generated from the light source module 100 toward the optical member 600 .

The second reflector 300 may be formed with a serrated reflection pattern on the surface facing the optical member 600, and the surface of the reflection pattern may be flat or curved.

The reason for forming the reflection pattern on the surface of the second reflector 300 is that the light generated by the light source module 100 can be uniformly diffused and reflected.

Thus, by forming the reflector for the air guide having at least one of the planar surface and the curved surface, the embodiments can provide a light weight, low manufacturing cost, and uniform brightness.

Therefore, the economical and reliability of the backlight unit can be improved.

12 is a view showing a display module having a backlight unit according to an embodiment.

As shown in FIG. 12, 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 to maintain a uniform cell gap, A liquid crystal layer (not shown) may be interposed.

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.

13 and 14 are views showing a display device according to an embodiment.

13, 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.

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.

14, 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.

100: light source module 200: first reflector
300: Second reflector

Claims (20)

A first reflector;
A second reflector; And,
And a light source module disposed between the first and second reflectors,
Wherein the second reflector includes a left region and a right region having some inclined surfaces,
Wherein the left region and the right region are asymmetric with respect to each other,
Wherein the first reflector comprises:
A sawtooth-shaped reflection pattern is formed on a surface facing the light source module,
Wherein a part of the surface of the reflection pattern is in the form of a flat surface, a convex surface or a concave surface. The display device according to claim 1, wherein a left area of the second reflector and a right area of the second reflector have different areas. The reflector according to claim 1 or 2, wherein the left region of the second reflector includes first and second regions, and the right region of the second reflector includes third and fourth regions,
Wherein the first region is a first inclined surface aligned with the light source module and the first reflector and inclined downward,
The second region is a second inclined surface adjacent to the first region and inclined upward from the first region,
The third region is a third inclined surface adjacent to the second region and inclined downward from the second region,
Wherein the fourth region is a fourth inclined surface aligned with the light source module and the first reflector and adjacent to the third region and inclined upward from the third region. The apparatus according to claim 3, wherein the first inclined surface is a curved surface having a first curvature, the second inclined surface is a curved surface having a second curvature, the third inclined surface is a curved surface having a third curvature, A curved surface having a fourth curvature,
Wherein the first curvature is different from the fourth curvature, and the second curvature is different from the third curvature. The display device of claim 1, wherein a size of the reflection pattern increases from an end of the first reflector to an open area. delete The apparatus according to claim 3, wherein the first inclined surface is a plane having a first inclination, the second inclined surface is a plane having a second inclination, the third inclined surface is a plane having a third inclination, A plane having a fourth inclination,
Wherein the first slope is different from the fourth slope and the second slope is different from the third slope. delete delete The apparatus of claim 3, wherein the first inclined surface is a curved surface having a predetermined curvature, the fourth inclined surface is a plane having a predetermined inclination, or the first inclined surface is a plane having a predetermined inclination, Lt; / RTI >
Wherein an area of the first inclined surface is different from an area of the fourth inclined surface. The apparatus according to claim 3, wherein the second inclined surface is a curved surface having a predetermined curvature, the third inclined surface is a plane having a predetermined inclination, or the second inclined surface is a plane having a predetermined inclination, Lt; / RTI >
Wherein an area of the second inclined surface is different from an area of the third inclined surface. delete delete The reflector according to claim 3, wherein a first reflector disposed in a left region of the second reflector is partially overlapped with a second inclined plane of the second reflector, and a first reflector disposed in a right region of the second reflector, And is completely overlapped with the fourth inclined surface of the reflector. The display device according to claim 1, wherein the first reflector and the light source module are disposed in a left region and a right region of the second reflector, respectively. The display device of claim 1, wherein the light source module disposed in the left area of the second reflector has different light output intensities from the light source module disposed in the right area of the second reflector, or has different numbers of light sources. delete delete delete delete

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