KR20130020303A - Backlight unit and display apparatus using the same - Google Patents

Abstract

PURPOSE: A backlight unit and a display device using the same are provided to reduce hot spots by using a reflector having an asymmetrical structure. CONSTITUTION: A backlight unit includes a first reflector(200), a second reflector(300), and a light source module(100). The light source module is arranged between the first and the second reflector. The second reflector includes the right part and the left part having a slope. The left part is asymmetrical to the right part. [Reference numerals] (AA) Air guide; (BB) Central line; (CC) First area; (DD) Second area; (EE) Third area; (FF) Fourth area; (GG) Left area; (HH) Right area

Description

Backlight unit and display apparatus using the same

Embodiments relate 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 the self-luminous PDP, an LCD requires a separate backlight unit due to the absence of its own light emitting device.

The backlight unit used in LCD is classified into an edge type backlight unit and a direct type backlight unit according to the position of the light source. In the edge type, the light source is disposed on the left and right sides or the top and bottom sides of the LCD panel and the light guide plate is used. Since the light is evenly distributed on the front surface, the light is uniform and the panel thickness can be made ultra 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) was used as the light source of the existing edge type or direct type backlight unit.

However, since the CCFL-based backlight unit is always powered by the CCFL, a considerable amount of power is consumed, and the problems of environmental pollution due to the addition of about 70% color reproduction rate and mercury are pointed out as disadvantages.

As a substitute for solving the above problems, research on a backlight unit using an LED (Light Emitting Diode) has been actively conducted.

When the LED is used as a backlight unit, the LED array can be partially turned on and off, which can drastically reduce the power consumption. For the RGB LED, it exceeds 100% of the NTSC (National Television System Committee) color reproduction range specification. To provide consumers with more vivid picture quality.

1 is a cross-sectional view illustrating a general backlight unit.

As shown in FIG. 1, the backlight unit includes a light guide plate 2, a reflector 3, an optical member 4, and a light source module 5. It may include.

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

Subsequently, the light guide plate 2 may have 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, which may be disposed on both sides of the light guide plate 2.

The backlight unit having such a structure can uniformly diffuse light using the light guide plate 2, but the light guide plate 2 not only makes the overall backlight unit heavy, but also causes a price increase.

Therefore, in the future, development of a backlight unit capable of uniformly diffusing light even without the light guide plate 2 will be required.

Embodiments provide a backlight unit having an air guide and a display device using the same 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, the second reflector including a left region and a right region having some inclined surfaces, and a left side The inclined surface of the region and the inclined surface of the right region may be asymmetric with 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 region of the second reflector includes first and second regions, the right 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 a first inclined plane inclined in the lower direction, the second region is adjacent to the first region, and is a second inclined surface inclined in the upper direction from the first region, and the third region is adjacent to the second region, A third inclined surface inclined downward from 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 slope is a curved surface having a first curvature, the second slope is a curved surface having a second curvature, the third slope is a curved surface having a third curvature, and the fourth slope is a curved surface having a fourth curvature. have.

In this case, 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 plane may be a plane having a first slope, the second inclined plane is a plane having a second slope, the third inclined plane may be a plane having a third slope, and the fourth inclined plane may be a plane having a fourth slope have.

In this case, the first slope may be different from the fourth slope, and the second slope may be different from the third slope.

Subsequently, the first inclined surface may be a curved surface having a predetermined curvature, the fourth inclined surface may be a plane having a predetermined slope, or the first inclined surface may be a flat surface having a predetermined slope, 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 slope, or the second inclined surface may be a flat surface having a predetermined slope, and the third inclined surface may be a curved surface having a predetermined curvature.

In addition, an area of the first inclined surface may be different from an area of the fourth inclined surface, and an area of the second inclined surface may be different from that of the third inclined surface.

Next, the first reflector disposed in the left region of the second reflector partially overlaps the second inclined surface of the second reflector, and the first reflector disposed in the right region of the second reflector completely overlaps the fourth inclined surface of the second reflector. Can be.

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

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

Embodiments can provide a light weight, low manufacturing cost, and uniform luminance by forming a reflector for an air guide having an asymmetric inclined surface without using a light guide plate.

In addition, by making the left region and the right region of the reflector asymmetric with each other, it is possible to reduce the hot spot phenomenon.

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

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

Hereinafter, exemplary 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. In addition, the size of each component does not necessarily reflect the actual size.

2A and 2B are diagrams for describing a two-edge type backlight unit according to an embodiment. 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 positioned between the first reflector 200 and the second reflector 300 and disposed adjacent to the first reflector 200.

In some cases, the light source module 100 may be disposed away from the second reflector 300 at the same time as being in contact with the first reflector 200, or may be disposed in contact with the second reflector 300 and at the same time as the first reflector 300. 200 may be spaced apart from each other.

Alternatively, the light source module 100 may be disposed apart from the first reflector 200 and the second reflector 300 by a predetermined distance, 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.

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 printed circuit board (PCB) substrate made of any one material selected from polyethylene terephthalate (PET), glass, polycarbonate (PC), and silicon (Si), or may be formed in a film form.

In addition, the substrate may selectively use a single layer PCB, a multilayer PCB, a ceramic substrate, a metal core PCB and the like.

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

Subsequently, the light source may be a light emitting diode chip, and the light emitting diode chip may include a blue LED chip or an ultraviolet LED chip, or a red LED chip, a green LED chip, a blue LED chip, and a yellow green LED chip. In addition, the package may be configured by combining at least one or more of the white LED chip.

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).

Next, the first reflector 200 and the second reflector 300 may face each other at a predetermined interval so as to have an air guide in the empty space between the first reflector 200 and the second reflector 300. have.

In addition, the first reflector 200 may be formed of any one of a reflective coating film and a reflective coating material layer to reflect the light generated from the light source module 100 in the direction of the second reflector 300.

In addition, a serrated reflection pattern is formed on a 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 reflective pattern on the surface of the first reflector 200 is to increase the luminance in the central region of the backlight unit by reflecting the light generated by the light source module 100 to the central region of the second reflector 300. to be.

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

Here, the inclined surface of the left region and the inclined surface of the right region may be asymmetric with each other.

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

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

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

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

At this time, 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 fourth curvature R4. It may have a curved surface.

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

For example, the first curvature R1 of the first inclined surface of the left region may be smaller than the fourth curvature R4 of the fourth inclined surface 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 inclined surface of the left region may be smaller than the third curvature R3 of the third inclined surface of the right region.

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

As such, the area and curvature of the inclined surface positioned in the left region of the second reflector 300 and the area and the curvature of the inclined surface positioned in the right region of the second reflector 300 may be asymmetrically formed.

As such, the reason why the left region and the right region of the second reflector 300 are asymmetrically manufactured is that when the left region and the right region of the second reflector 300 are symmetrical with each other, light concentrates on a predetermined region. This is because hot spots may appear.

Therefore, when the left region and the right region of the second reflector 300 are manufactured in an asymmetrical structure, there is an effect of reducing the hot spot phenomenon.

Also, the first curvature R1 may be different from the second curvature R2. For example, the first curvature R1 of the first inclined surface of the left region may be smaller than the second curvature R2 of the second inclined 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 surface of the right region may be smaller than the third curvature R3 of the third inclined surface 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 a first slope, and the first 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 a second slope, and the third inclined plane of the third region located in the right region of the second reflector 300 is a plane having a third slope and the right region of the second reflector 300 The fourth slope of the fourth region located at may be a plane having a fourth slope.

Here, the first slope of the first slope may be different from the fourth slope of the fourth slope, for example, the first slope of the first slope of the left region is greater than the fourth slope of the fourth slope of the right region. Can be.

Also, the second slope of the second slope may be different from the third slope of the third slope, for example, the second slope of the second slope of the left region is greater than the third slope of the third slope of the right region. Can be.

Then, the first slope of the first slope may be different from the second slope of the second slope, for example, the first slope of the first slope of the left region is greater than the second slope of the second slope of the left region. Can be.

The fourth slope of the fourth slope may be different from the third slope of the third slope, for example, the fourth slope of the fourth slope of the right region is greater than the third slope of the third slope of the right region. Can be.

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

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

As such, the first and second regions positioned in the left region of the second reflector 300 and the third and fourth regions positioned in the right region of the second reflector 300 may have different inclined surfaces having different areas, curvatures, or slopes. It may be an asymmetric structure having a.

Therefore, by making the left region and the right region of the second reflector 300 asymmetrical with each other, there is an effect that can reduce the hot spot phenomenon.

On the other hand, the first and fourth regions of the second reflector 300 may be formed with a specular reflection sheet that specularly reflects light, and the second and third regions of the second reflector 300 may be specular reflection sheets and specularly reflect light At least one of the diffuse reflection sheet to diffuse the reflection may be formed.

Here, the reason for forming the specular reflection sheet in the first and fourth regions of the second reflector 300 is to reflect a lot of light to the central region of the second reflector 300 having low luminance, thereby providing uniform luminance. Because.

Further, the reason for forming the diffuse reflection sheet in the second and third regions of the second reflector 300 is that the luminance can be compensated by the diffuse reflection of light in the second and third regions of the second reflector 300 having low luminance. Because there is.

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

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

Alternatively, the second reflector 300 may have different surface roughnesses while the first, second, third, and fourth regions are formed of different materials.

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

3A is a view illustrating a light source module 100 spaced apart from the first reflector 200 and the second reflector 300 by a predetermined distance, and FIG. 3B simultaneously shows the first reflector 200 and the second reflector 300. FIG. 3C is a view illustrating a light source module 100 in contact with each other, and FIG. 3C is a view showing a light source module 100 contacting the first reflector 200 and being spaced apart from the second reflector 300 by a predetermined distance. The light source module 100 disposed at a predetermined distance from the first reflector 200 and in contact with the second reflector 300 is shown.

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

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

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

The reason is that when the first distance d1 is larger than the second distance d2, a hot spot phenomenon may appear.

Subsequently, as illustrated in FIG. 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 is in contact with the first and second reflectors 200 and 300, thereby preventing hot spots and transmitting light to an area far from the light source module 100, and also the thickness of the entire backlight unit. You can also reduce the

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 may be in contact with the first reflector 200 to prevent hot spots and transmit light to a region far from the light source module 100.

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

4A and 4B are diagrams illustrating a first reflector disposed in left and right regions of a second reflector.

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

Here, the inclined surface of the left region and the inclined surface of the right region may be asymmetric with each other.

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

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

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

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

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

Here, the first reflector 200 positioned in the left region of the second reflector 300 may completely overlap 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 completely overlap the fourth region of the second reflector 300.

That is, the first virtual line extending from the end of the first reflector 200 positioned in the left region of the second reflector 300 in the direction of the second reflector 300 is located in the first region of the second reflector 300. Therefore, the first reflector 200 positioned in the left region of the second reflector 300 may completely overlap the first region of the second reflector 300.

The second virtual line extending from the end of the first reflector 200 positioned in the right region of the second reflector 300 in the direction of the second reflector 300 is located in the fourth region of the second reflector 300. Therefore, the first reflector 200 positioned in the right region of the second reflector 300 may completely overlap the fourth region of the second reflector 300.

In addition, as illustrated in FIG. 3B, the first reflector 200 positioned in the left region of the second reflector 300 may partially overlap the second region of the second reflector 300, and the second reflector ( The first reflector 200 positioned in the right region of the 300 may completely overlap the fourth region of the second reflector 300.

That is, the first virtual line extending from the end of the first reflector 200 positioned in the left region of the second reflector 300 in the direction of the second reflector 300 is located in the second region of the second reflector 300. Therefore, the first reflector 200 positioned in the left region of the second reflector 300 may partially overlap the second region of the second reflector 300.

The second virtual line extending from the end of the first reflector 200 positioned in the right region of the second reflector 300 in the direction of the second reflector 300 is located in the fourth region of the second reflector 300. Therefore, the first reflector 200 positioned in the right region of the second reflector 300 may completely overlap the fourth region of the second reflector 300.

As such, the first reflector 200 positioned in the left region of the second reflector 300 and the first reflector 200 positioned in the right region of the second reflector 300 may be asymmetrically disposed.

5A to 5D are diagrams illustrating inclined surfaces of the left region of the second reflector.

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

The second region may be a second inclined surface 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 first curvature R1, and the second inclined surface of the second region may be a curved surface having a second curvature R2, and the first and second curvatures R1 and R2 may be different from each other. It may be.

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

Subsequently, as shown in FIG. 5B, the left region of the second reflector 300 may include first and second regions, and the first region may be aligned with the light source module 100 and the first reflector 200. The first inclined surface may be aligned and inclined downward.

The second region may be a second inclined surface 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 slope, and the second inclined surface of the second region may be a curved surface having a predetermined curvature.

Next, as shown in FIG. 5C, the left region of the second reflector 300 may include first and second regions, which are aligned with the light source module 100 and the first reflector 200. The first inclined surface may be aligned and inclined downward.

The second region may be a second inclined surface 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 slope.

Subsequently, as shown in FIG. 5D, the left region of the second reflector 300 may include first and second regions, and the first region may be aligned with the light source module 100 and the first reflector 200. The first inclined surface may be aligned and inclined downward.

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

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

Meanwhile, the right region of the second reflector 300 may include third and fourth regions, which are the same as the left region of the second reflector 300 illustrated in FIGS. 5A to 5D, and thus, detailed description thereof will be omitted. .

6a to 6d are views showing an asymmetric inclined plane of the left and right regions of the second reflector.

As shown in FIG. 6A, the second reflector 300 may include a left region having an inclined surface and a right region 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 a first inclined surface aligned with the light source module 100 and the first reflector 200 and inclined downward, and the second region may be adjacent to the first region, and the first region may be adjacent to the first region. It may be a second inclined surface inclined upwardly from the region.

Subsequently, the third region may be a third inclined surface adjacent to the second region and inclined downward from the second region, and the fourth region may be aligned with the light source module 100 and the first reflector 200. It may be a fourth inclined surface inclined upward from the third region adjacent to the three regions.

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

The fourth slope of the fourth region may be a plane having a fourth slope, the third slope of the third region may be a plane having a third slope, and the third and fourth slopes 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 flat surface having a predetermined slope.

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

Subsequently, as shown in FIG. 6C, the first inclined surface of the first region may be a plane having a predetermined slope, 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 slope.

In addition, as shown in FIG. 6D, the first inclined plane of the first region may be a plane having a first slope, and the second inclined plane of the second region may be a plane having a second slope, and the first and second slopes May be different.

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

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

7 is a view showing an asymmetric 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 region having an inclined surface and a right region 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 the first region located in the left region of the second reflector 300 and the fourth region located in the right region of the second reflector 300.

Here, the light source module 100 disposed in the left region of the second reflector 300 may have a different light output intensity from the light source module 100 disposed in the right region of the second reflector 300.

For example, the light output intensity of the light source module 100 disposed in the left region of the second reflector 300 may be smaller than the light output intensity of the light source module 100 disposed in the right region of the second reflector 300. Can be.

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

In some cases, the light source module 100 disposed in the left region of the second reflector 300 may have a different number of light sources than the light source module 100 disposed in the right region of the second reflector 300.

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

Here, 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. The number of light sources 101 may be smaller than the number of light sources 101 of the light source module 100 disposed in the right region of the second reflector 300.

FIG. 8 is a diagram illustrating an asymmetric first reflector of the left and right regions of the second reflector.

As shown in FIG. 8, the second reflector 300 may include a left region having an inclined surface and a right region 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 the first region located in the left region of the second reflector 300 and the fourth region located in the right region of the second reflector 300.

Here, the first reflector 200 disposed in the left region of the second reflector 300 may have a width different from that of the first reflector 200 disposed in the right region of the second reflector 300.

For example, the width W1 of the first reflector 200 disposed in the left region of the second reflector 300 may be smaller than the width W2 of the first reflector 200 disposed in the right region of the second reflector 300. Can be.

9A to 9D are diagrams illustrating a first reflector having an inclined surface, in which FIG. 9A is a case in which the inclined surface is a flat surface, and FIGS. 9B, 9C and 9D are cases in which the inclined surface is a curved surface.

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

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

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

That is, in the first reflector 200, the thickness t1 of the region adjacent to the light source module 100 and the thickness t2 of the region far from the light source module 100 may be different from each other. As shown in FIGS. 9A and 9B, the light source module 100 may be different. The thickness t1 of the region adjacent to) may be greater than the thickness t2 of the region far from the light source module 100.

In some cases, as shown in FIGS. 9C and 9D, 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.

In addition, as shown in FIG. 9D, the first reflector 200 may include both an inclined surface and a 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 surface may be the same as the length L2 of the plane, or may be different from each other in some cases.

In addition, a predetermined reflection pattern may be formed on the surface of the first reflector 200.

10A to 10D show a first reflector having a reflective pattern.

10A shows that the reflective pattern 220 is serrated, the surface of the reflective pattern 220 is flat, and FIGS. 10B and 10C show the reflective pattern 220 is serrated, and the surface of the reflective pattern 220 is curved. Can be.

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

In some cases, as shown in FIG. 10D, the size of the reflective pattern 220 may gradually increase from the end of the first reflector 200 toward the open area.

As described above, the reason why the reflective pattern 220 is formed on the first reflector 200 is because not only the reflection of the light but also the diffusion effect of uniformly spreading the light may be provided.

Therefore, the reflective pattern 220 may be manufactured in various sizes in the corresponding area according to the overall luminance distribution of the backlight.

11 is a view illustrating 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 the space between the second reflector 300 and the optical member 600.

Here, the optical member 600 may have an uneven pattern 620 on the upper surface.

The optical member 600 is to diffuse the light emitted from the light source module 100, and may form the uneven pattern 620 on the upper surface to increase the diffusion effect.

That is, the optical member 600 may be formed of several layers, and the uneven pattern 620 may be formed on the top layer or the surface of any one layer.

In addition, the uneven pattern 620 may have a stripe 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, the angle between the first surface and the second surface is an obtuse or acute angle Can be.

In some cases, the optical member 600 may include at least one sheet, and may selectively 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 include at least one of a metal or a metal oxide, and may be, for example, high, such as aluminum (Al), silver (Ag), gold (Au), or titanium dioxide (TiO ₂ ). It may comprise a metal or metal oxide having a reflectance.

In addition, the second reflector 300 may be formed of any one of a reflective coating film and a reflective coating material layer, and may serve to reflect light generated from the light source module 100 in the direction of the optical member 600. .

The second reflector 300 may have a sawtooth reflective pattern formed on a surface facing the optical member 600, and the surface of the reflective pattern may be flat or curved.

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

As such, the embodiments may provide a reflector for an air guide having at least one inclined surface among flat and curved surfaces, thereby providing light weight, low manufacturing cost, and uniform luminance.

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

12 illustrates 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 illustrate a display device according to an embodiment.

Referring to FIG. 13, the display device 1 includes a display module 20, a front cover 30 surrounding the display module 20, a back cover 35, and a driver 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) of a transparent material that transmits light, and the front panel protects the display module 20 at regular intervals, and the light emitted from the display module 20. The light is transmitted through the display module 20 so that the image displayed on the display module 20 can be seen from the outside.

The back cover 35 may be combined with the front cover 30 to protect the display module 20.

The driving unit 55 may be disposed on one surface 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 controller 55a may be a timing controller. The driving controller 55a may be a driver for controlling operation timing of each driver IC of the display module 20. The main board 55b may include a V sink, an H sink, and an R, G, The driving unit transmits a B resolution signal, and the power supply unit 55c is a driving unit that applies power to the display module 20.

The driving unit 55 may be provided in the back cover 35 and may be wrapped by the driving unit cover 40.

A plurality of holes may be provided in the back cover 35 to connect the display module 20 and the driving unit 55, and a stand 60 supporting the display device 1 may be provided.

On the other hand, as shown in FIG. 14, the driving controller 55a of the driving unit 55 may be provided in the back cover 35, and the main board 55b and the power board 55c may be provided in the stand 60. have.

In addition, the driving unit cover 40 may wrap only the driving unit 55 provided in 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.

Features, structures, effects, and the like described in the above 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 each embodiment may be combined or modified with respect to other embodiments by those 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,
A light source module disposed between the first and second reflectors,
The second reflector includes a left region and a right region having some inclined surfaces,
The left area and the right area are asymmetric with each other. The backlight unit of claim 1, wherein the left region of the second reflector and the right region of the second reflector have different areas. The method of claim 1, 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,
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 upwardly from the first region,
The third region is a third inclined surface adjacent to the second region and inclined downward from the second region,
And the fourth region is a fourth inclined surface aligned with the light source module and the first reflector and inclined upwardly from the third region adjacent to the third region. The method of 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, the fourth inclined surface is The backlight unit is a curved surface having a fourth curvature. The backlight unit of claim 4, wherein the first curvature is different from the fourth curvature. The backlight unit of claim 4, wherein the second curvature is different from the third curvature. 4. The method of claim 3, wherein the first slope is a plane having a first slope, the second slope is a plane having a second slope, the third slope is a plane having a third slope, and the fourth slope is A backlight unit that is planar with a fourth slope. The backlight unit of claim 7, wherein the first slope is different from the fourth slope. The backlight unit of claim 7, wherein the second slope is different from the third slope. 4. The method 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 slope, or the first inclined surface is a flat surface having a predetermined slope, and the fourth inclined surface is a predetermined curvature. The backlight unit having a curved surface. The method of 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 slope, or the second inclined surface is a plane having a predetermined slope, the third inclined surface is a predetermined curvature The backlight unit having a curved surface. The backlight unit of claim 3, wherein an area of the first inclined surface is different from an area of the fourth inclined surface. The backlight unit of claim 3, wherein an area of the second inclined surface is different from an area of the third inclined surface. The second reflector of claim 3, wherein the first reflector disposed in the left region of the second reflector partially overlaps the second inclined surface of the second reflector, and the first reflector disposed in the right region of the second reflector is the second reflector. The backlight unit completely overlaps the fourth inclined surface of the reflector. The backlight unit of claim 1, wherein the first reflector and the light source module are disposed at left and right regions of the second reflector, respectively. The backlight unit of claim 1, wherein the light source module disposed in the left region of the second reflector has a different light output intensity from the light source module disposed in the right region of the second reflector. The backlight unit of claim 1, wherein the light source module disposed in the left region of the second reflector has a different number of light sources than the light source module disposed in the right region of the second reflector. The backlight unit of claim 1, wherein the first reflector disposed in the left region of the second reflector has a width different from that of the first reflector disposed in the right region of the second reflector. The backlight unit of claim 1, further comprising an optical member disposed at a predetermined interval from the second reflector, wherein an air guide is formed in a space between the second reflector and the optical member. Display panel;
It includes a backlight unit for irradiating light to the display panel,
20. The display apparatus using the backlight unit of claim 1, wherein the backlight unit is any one of the backlight units of claim 1.

Images