KR20130063359A - Backlight unit, display apparatus using the same, and lighting system including the same - Google Patents

Abstract

PURPOSE: A backlight unit, a display apparatus using the same, and a lighting system including the same are provided to reduce the number of light sources by using a protruded inner surface of the sidewall of a bottom cover in an air guide type backlight unit. CONSTITUTION: At least one light source module is arranged between a first and a second reflecting part. A bottom cover(70) supports the second reflecting part. The light source module is arranged in the first sidewall(72) of the bottom cover in a first direction. The second sidewall(74) of the bottom cover is extended from the front end part(73) of the first sidewall towards a second direction. The edge part(74a) of the inner side of the second sidewall is protruded on a center part(74b). [Reference numerals] (AA) Second direction; (BB) First direction

Description

BACKLIGHT UNIT, DISPLAY APPARATUS USING THE SAME, AND LIGHTING SYSTEM INCLUDING THE SAME}

Embodiments relate to a backlight unit, a display device using the same, and a lighting system including the same.

In general, typical large display devices include a liquid crystal display (LCD) or a plasma display panel (PDP).

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 the 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 and / or the upper and lower sides of the LCD panel. It evenly distributes the light evenly on the front side, so the light uniformity is excellent and the panel thickness can be made ultra thin.

The direct method is a technology generally used for a display of 20 inches or more. Since a plurality of light sources are disposed under the panel, it has an advantage of superior light efficiency compared to an edge method, and thus is mainly used for a large display requiring high brightness.

Cold Cathode Fluorescent Lamp (CCFL) was used as the light source of the conventional edge or direct backlight unit. However, the CCFL-based backlight unit consumes a considerable amount of power since power is always supplied to the CCFL, and has a color reproducibility of about 700% compared to the cathode ray tube (CRT). It has the disadvantage of causing environmental pollution problems.

As a substitute for solving the above problems, research on a backlight unit using a light emitting diode (LED) 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. Green, B: Blue LEDs can exceed 100% of the National Television System Committee (NTSC) color gamut specification to provide consumers with more vivid picture quality.

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

LCD products employing LEDs with the above advantages are currently being released, but the driving mechanism and the printed circuit board (PCB) are expensive because the existing CCFL light source and the driving mechanism are different. Therefore, the LED backlight unit is still applied only to expensive LCD products.

FIG. 1 is a plan view of a reflector 32 formed on the light source modules 10 and 20 and the bottom cover 30 in a typical two-edge type backlight unit.

The light source modules 10 and 20 shown in FIG. 1 may include a circuit board having an electrode pattern and a light source generating light. In this case, since the peripheral area of the center of the bottom cover 30 is far from reaching the light emitted from the light source modules 10 and 20 when compared with other parts, the dark portions A and B may be formed. . Therefore, improvement of such dark parts A and B is required.

Republic of Korea Patent Publication No. 10-2011-0108832 ("light emitting device, light unit and display device having the same", published October 06, 2011)

Embodiments provide a backlight unit capable of providing uniform luminance and lowering manufacturing costs, a display device using the same, and a lighting system including the same.

In an embodiment, the backlight unit may include: first and second reflectors; At least one light source module disposed between the first and second reflectors; And a bottom cover supporting the second reflector, wherein the bottom cover comprises: a first sidewall on which the light source module is disposed in a first direction; And a second sidewall extending from a distal end portion of the first sidewall in a second direction different from the first direction, wherein an inner side surface of the second sidewall protrudes inward more than a center portion of an edge portion close to the distal end portion. Can be.

In addition, the projecting degree of the inner side surface of the second side wall may increase linearly or nonlinearly from the central portion toward the edge portion.

For example, the edge portion of the inner side surface of the second side wall may protrude 27 mm to 37 mm further inward than the central portion, and the light source module includes a light source and a circuit board to mount the light source; The light source may be spaced apart from the front end of the first side wall by 2 mm to 12 mm.

The inner side surface of the second side wall has a plurality of inclined surfaces adjacent to at least one inflection portion. The inflection portion may be located at the central portion of the inner surface. The inflection portion is located closer to the tip of the first sidewall than the central portion at the inner side of the second sidewall, or the inflection portion at the inner side of the second sidewall is more from the distal end of the first sidewall than the central portion. It may be located far away.

In addition, the radius of curvature or slope of the plurality of inclined surfaces may be different from each other. The plurality of inclined surfaces may be formed to be symmetrical with respect to the central portion of the second sidewall.

In addition, the inner side surface of the second sidewall may have a predetermined pattern. The density of the predetermined pattern may decrease toward the edge portion of the second sidewall and dense toward the center portion. The density of the predetermined pattern may be different for each of the plurality of inclined surfaces. In addition, at least one of the plurality of inclined surfaces may have the predetermined pattern having different densities. The predetermined pattern may be formed to be symmetric with respect to a central portion of the inner side surface of the second side wall. In addition, the predetermined pattern may be in the form of a recess or protrusion.

In the air guide type backlight unit, since the inner surface protrudes from the edge of the bottom cover sidewall, the number of light sources can be reduced, and the backlight of the center portion of the bottom cover can be removed to provide overall uniform brightness. The manufacturing cost of the unit can be lowered and the reliability can be improved.

1 is a plan view of a reflector formed on a light source module and a bottom cover in a typical two-edge type backlight unit.
2A and 2B illustrate a two-edge type backlight unit according to an embodiment.
3A is a top perspective view of a bottom cover according to an embodiment, and FIG. 3B illustrates a combined plan view of a bottom cover and at least one light source module according to an embodiment.
4A to 4C illustrate a plan view in which a bottom cover and a light source module are coupled according to an embodiment.
5A-5C show plan views of second sidewalls according to embodiments.
6A through 6C are cross-sectional views of the second sidewall of the bottom cover illustrated in FIG. 3B according to the embodiment viewed from the 6-6 ′ direction.
7 is a bottom perspective view of a bottom cover including a second reflector according to an embodiment.
8 illustrates a display module having a backlight unit according to an embodiment.
9 and 10 illustrate a display apparatus according to an embodiment.

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

In the description of this embodiment, when described as being formed on the "top" or "bottom" (on or under) of each element, the top (bottom) or bottom (bottom) (on or under) includes both elements that are in direct contact with each other or one or more other elements are formed indirectly between the two elements. do.

In addition, when expressed as "on" (on) or "under" (under) may include the meaning of the downward direction as well as the upward direction based on one element (element).

2A and 2B illustrate a two-edge type backlight unit according to an embodiment. 2A is a top perspective view of the backlight unit, and FIG. 2B is a bottom perspective view of the backlight unit.

2A and 2B may include at least one light source module 10, an optical member 40, a cover plate 50, a panel support 60, and a bottom cover. cover 70, a first reflector 80, and a second reflector 82.

The light source module 10 may include a circuit board having an electrode pattern and a light source (or a light emitting device) that generates light. In this case, at least one light source may be mounted on the circuit board, and an adapter pattern for connecting a light source to an adapter for supplying power may be formed.

For example, a carbon nanotube electrode pattern for connecting the light source and the adapter may be formed on the upper surface of the circuit board. The circuit board may be made of polyethylene terephthalate (PET), glass, polycarbonate (PC) or silicon (Si), and may be a printed circuit board (PCB) on which a plurality of light sources are mounted, and formed in a film form. Can be. In addition, the circuit board may selectively use a single layer PCB, a multilayer PCB, a ceramic substrate, a metal core PCB and the like.

Meanwhile, 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.

In addition, the white LED may be implemented by combining a yellow phosphor on a blue LED, or simultaneously using a red phosphor and a green phosphor on a blue LED, and a yellow phosphor, a red phosphor, It may be implemented by using green phosphor simultaneously.

At least one light source module 10 is disposed between the first reflector 80 and the second reflector 82. The light source module 10 may be disposed adjacent to the first reflector 80 or the second reflector 82. In some cases, the light source module 10 may be disposed to be spaced apart from the second reflector 82 at the same time as being in contact with the first reflector 80, or at the same time as being in contact with the second reflector 82. 1 may be disposed away from the reflective portion 80 by a predetermined interval. Alternatively, the light source module 10 may be disposed at a predetermined distance from the first reflecting unit 80 and the second reflecting unit 82, or simultaneously with the first reflecting unit 80 and the second reflecting unit 82. May be contacted.

In addition, the light exit surface of the light source module 10 may be arranged in various directions.

That is, the light source module 10 may be a direct emitting type structure in which the light emitting surface is disposed in the direction of an air guide between the optical member 40 and the second reflecting portion 82. In addition, the light source module 10 may have an indirect emission type structure in which the light exit surface is disposed in one of the directions of the first reflector 80, the second reflector 82, and the cover plate 50. . In this case, the indirect emission type light source module 10 reflects the emitted light from the first reflector 80, the second reflector 82, and the cover plate 50, and the reflected light is again guided by an air guide of the backlight unit. You can go in the direction. As such, the reason for arranging the light source module 10 in an indirect light emitting structure is that a hot spot phenomenon can be reduced.

Next, the first reflector 80 and the second reflector 82 may face each other at a predetermined interval so as to have an air guide in the empty space between the first reflector 80 and the second reflector 82. have.

Here, the first reflecting unit 80 may have an open area and may be disposed in contact with one side of the light source module 10 or spaced at regular intervals. That is, the central region of the first reflector 80 is open, and the light source module 10 may be disposed to face each other at both edge regions of the first reflector 80.

The first reflector 80 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 10 in the direction of the second reflector 82. have.

In addition, a serrated reflection pattern is formed on a surface of the first reflection unit 80 that faces the light source module 10, 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 80 is to reflect the light generated by the light source module 10 to the central region of the second reflector 82, thereby increasing the luminance in the central region of the backlight unit. To do so.

Next, the second reflector 82 is disposed on the inner surface of the bottom cover 70 spaced apart from the light source module 10 by a predetermined distance, and at a predetermined angle from a horizontal plane parallel to the surface of the first reflector 80. The inclined surface may have an inclined surface.

Here, the inclined surface of the second reflector 82 serves to reflect the light generated from the light source module 10 or the light reflected from the first reflector 80 to the open area of the first reflector 80. can do.

In addition, the second reflector 82 may include at least two inclined surfaces having at least one inflection point. In some cases, the central area of the second reflector 82 may have a flat plane or a concave curved shape. That is, the central region of the second reflector 82 may be any one of a flat plane, a convex curved surface, and a concave curved surface, and may include a plurality of shapes.

In some cases, the light source module 10 may be spaced apart from the first reflector 80 by a first distance and spaced apart from the second reflector 82 by a second distance. Here, the second distance may be larger than the first distance and may be smaller. The reason for this is to concentrate the light generated by the light emitting module 10 to the center region of the second reflector 82, so as to increase the luminance in the center region of the backlight unit.

The second reflector 82 is not parallel to the first reflector 80 and may be at least one of a plane, a flat inclined plane, a concave inclined plane, and a convex inclined plane.

Subsequently, the second reflector 82 may have a structure in which a reflective film is attached to a mold body having an inclined surface, or may be a structure in which a reflective film having an inclined surface is attached to a mold body having a flat surface. It may be the mold body itself with a photo reflective surface.

Here, the reflective film may include at least one of a metal or a metal oxide, for example, a metal having a high reflectance such as aluminum (Al), silver (Ag), gold (Ag), or titanium dioxide (TiO ₂ ). Or a metal oxide.

The reflective patterns of the first reflector 80 and the second reflector 82 may be different from each other. That is, the first reflector 80 may have a specular reflection surface that specularly reflects light, and the second reflector 82 may have a diffuse reflection surface that diffusely reflects light. Alternatively, the first reflector 80 may have a diffuse reflection surface that diffusely reflects light, and the second reflector 82 may have a specular reflection surface that specularly reflects light.

In some cases, the second reflector 82 may arrange the specular reflection surface in an area adjacent to the light source module 10, and may arrange the diffuse reflection surface in an area far from the light source module 10.

Meanwhile, the optical member 40 may be supported by the cover plate 50 and disposed to face the second reflector 82. Here, the optical member 40 is composed 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, the prism sheet guides the diffused light to the light emitting region, and the brightness diffusion sheet can enhance the brightness. In addition, at least one of the upper surface and the lower surface of the optical member 40 may have a concave-convex shape for uniform diffusion of light.

Next, the cover plate 50 may contact the first reflecting unit 80 and the second reflecting unit 82 to be fixed to each other. Here, the cover plate 50 may be different from the bottom cover 70 including the second reflector 82. That is, the cover plate 50 may be made of metal.

In addition, the panel support part 60 covers a part of the cover plate 50 and may be fixed to the cover plate 50 and disposed.

The bottom cover 70 supporting the second reflector 82 may be made of a polymer resin such as plastic to enable injection molding.

3A is a top perspective view of the bottom cover 70 according to the embodiment, and FIG. 3B shows a combined plan view of the bottom cover 70 and the at least one light source module 10 according to the embodiment.

Referring to FIG. 3A, the bottom cover 70 has first and second sidewalls (or sidewall portions) 72 and 74. The light source module 10 is disposed on the first sidewall 72 in the first direction. In addition, the second side wall 74 extends from the distal end portion 73 of the first side wall 72 in a second direction different from the first direction. According to the embodiment, on the inner side of the second side wall 74, the edge portion 74a proximate to the tip portion 73 protrudes further into the bottom cover 70 than the center portion 74b.

4A to 4C illustrate a plan view in which the bottom cover 70 and the light source module 10 are coupled according to the embodiment.

According to the embodiment, the extent to which the inner surface of the second sidewall 74 of the bottom cover 70 protrudes may increase linearly from the central portion 74b to the edge portion 74a.

For example, as shown in FIGS. 3A, 3B, and 4B, the extent to which the inner side surface of the second sidewall 74 protrudes may increase linearly from the central portion 74b to the edge portion 74a. Can be. That is, the inner side surface of the second side wall 74 shown in FIGS. 3A and 3B increases linearly in a curved shape toward the edge portion 74a, or the inner side surface of the second side wall 74 shown in FIG. 4B The linear portion may increase linearly toward the edge portion 74a.

According to another embodiment, the extent to which the inner surface of the second sidewall 74 of the bottom cover 70 protrudes may increase nonlinearly from the central portion 74b to the edge portion 74a. For example, as shown in FIGS. 4A and 4C, the degree of protrusion of the inner surface may increase nonlinearly from the central portion 74b to the edge portion 74a near the tip portion 73.

For example, suppose that the central portion 74b of the inner side of the second sidewall 74 is the center 74c of the inner side and the edge region 74a is the leading end 73 of the first sidewall 72. 4A to 4C, the tip portion 73, which is the edge of the inner side surface of the second sidewall 74, may protrude more by a distance d1 than the center 74c of the inner side surface. For example, the distance d1 may be about 27 mm to 37 mm.

In addition, the light source 10A of the light source module 10 may be disposed to be spaced apart by 2 mm to 12 mm from the tip portion 73, which is the edge of the second side wall 74.

As such, since the edge portion 74a of the inner side surface of the second side wall 74 of the bottom cover 70 protrudes further inward than the center portion 74b, the light generated from the light source 10 is centered. More reflections can be made toward portion 74b. Therefore, the backlight unit according to the present exemplary embodiment can improve the dark portions A and B as shown in FIG. 1, thereby providing uniform luminance. In addition, in the case of the general backlight unit illustrated in FIG. 1, the light source is disposed at the distance d1, whereas in the present embodiment, the light source does not need to be disposed at the distance d1. Therefore, the backlight unit according to the present embodiment can reduce the number of light sources than the general backlight unit, so the manufacturing cost is lowered.

5A-5C show a top view of a second sidewall 74 according to an embodiment.

According to an embodiment, the inner side surface of the second side wall 74 may have a plurality of inclined surfaces adjacent to the at least one inflection portion.

For example, the second sidewall 74 may have a shape as shown in FIG. 5A. 5A is a plan view of the second sidewall 74 shown in FIGS. 3A and 3B, showing the difference in radius of curvature of the first and second slopes 91 and 92 of the inner side of the second sidewall 74. At this time, on the inner side surface of the second side wall 74, the radius of curvature R1 of the first inclined surface 91 adjacent to each other around the inflection portion P and the radius of curvature R2 of the second inclined surface 92 They can be different or the same.

In addition, the inflection portion P between the first and second inclined surfaces 91 and 92 may be located at the central region 74b of the second sidewall 74, for example, the center 74c. Alternatively, the inflection portion P may be located closer to the tip portion 73 of the first side wall 72 than the center 74c on the inner side surface of the second side wall 74. Alternatively, the inflection portion P may be located farther from the distal end portion 73 of the first sidewall 72 than the center 74c on the inner side surface of the second sidewall 74.

If the radius of curvature R1 of the first inclined surface 91 adjacent to the first sidewall 72 is smaller than the radius of curvature R2 of the second inclined surface 92, the inflection portion P may be the first sidewall. Will be closer to 72. However, when the radius of curvature R1 of the first inclined surface 91 adjacent to the first sidewall 72 is greater than the radius of curvature R2 of the second inclined surface 92, the inflection portion P is formed by the first sidewall ( 72) will be located further away.

In addition, the highest height H1 of the first inclined surface 91 and the highest height H2 of the second inclined surface 92 may be the same or different from each other. In addition, the first length L1 between the inflection portion P and the end of the first inclined surface 91 is equal to or equal to the second length L2 between the inflection portion P and the end of the second inclined surface 92. Can be different.

According to another embodiment, the second sidewall 74 may be implemented as shown in FIG. 5B. FIG. 5B is a plan view of the second sidewall 74 illustrated in FIG. 4A, and the plurality of adjacent inverted portions P, P1, P2, P3, and P4 are disposed adjacent to each other on the inner side surface of the second sidewall 74. The difference in the radius of curvature of the third to eighth inclined surfaces 93 to 98 is shown.

The third and fourth inclined surfaces 93 and 94 are adjacent to each other about the inflection portion P, and the third and fifth inclined surfaces 93 and 95 are adjacent to each other about the inflection portion P1, and the fifth And the sixth inclined surfaces 95 and 96 are adjacent to each other about the inflection portion P2, and the fourth and seventh inclined surfaces 94 and 97 are adjacent to each other about the inflection portion P3. The eight inclined surfaces 97 and 98 are adjacent to each other about the inflection portion P4.

For example, the radii of curvature R3 to R8 of the third to eighth inclined surfaces 93 to 98 on the inner side of the second sidewall 74 may be different or the same. Further, the heights H3 to H8 of the third to eighth inclined surfaces 93 to 98 may be the same as or different from each other. In addition, the lengths L3 to L8 of the third to eighth inclined surfaces 93 to 98 may be the same as or different from each other.

According to yet another embodiment, the second sidewall 74 may be implemented as shown in FIG. 5C. FIG. 5C is a plan view of the second sidewall 74 illustrated in FIG. 4C, and the ninth to twelfth adjacent to each of the plurality of inflections P, P5, and P6 on the inner side of the second sidewall 74. The difference in the slopes of the inclined surfaces 99 to 102 is shown.

The ninth and tenth inclined surfaces 99 and 100 are adjacent to each other about the inflection portion P, and the ninth and eleventh inclined surfaces 99 and 101 are adjacent to each other around the inflection portion P5 and the tenth And the twelfth inclined surfaces 100 and 102 are adjacent to each other about the inflection portion P6. For example, the inclinations of the ninth to twelfth inclined surfaces 99 to 102 on the inner side of the second sidewall 74 may be different or the same. In addition, the heights H9 to H12 of the ninth to twelfth inclined surfaces 99 to 102 may be the same as or different from each other. In addition, the lengths L9 to L12 of the ninth to twelfth inclined surfaces 99 to 102 may be the same as or different from each other.

In addition, the inclined surface formed on the inner side surface of the second side wall 74 may be formed to be symmetric with respect to the central portion 74b of the second side wall 74. For example, when the inflection portion P is located at the center 74c of the second sidewall 74, the inner portion of the second sidewall 74 is the inflection portion P as shown in FIGS. 5A to 5C. It may be formed to be symmetric with respect to.

6A to 6C are cross-sectional views of the second sidewall 74 of the bottom cover 70 shown in FIG. 3B according to the embodiment viewed from the 6-6 'direction. Even when the second sidewall 74 is formed as shown in FIGS. 4A to 4C, the following description applies equally, but is not limited thereto.

According to an embodiment, the inner side surface of the second sidewall 74 of the bottom cover 70 may have a predetermined pattern 110. 6A to 6C, the density of the predetermined pattern 110 gradually decreases from the central portion 74b to the edge portion 73a of the second sidewall 74, and the most. It can be pushed toward the center portion 74b from the seat portion 74a.

In this way, the pattern 110 decreases as it goes from the center portion 74b to the edge portion 74a and the pattern 110 moves toward the center portion 74b from the edge portion 74b. The light generated at 10) is more reflected at the central portion 74b. Thus, the arm portions A and B as shown in FIG. 1 can be improved.

6A to 6C show the patterns of the patterns formed on the inclined surfaces when the inclined surfaces of the inner side surfaces of the second side walls 74 are respectively formed as shown in FIGS. 5A to 5C.

According to an embodiment, the density of the predetermined pattern on the inner side surface of the second side wall 74 may be the same for each of the plurality of inclined surfaces. For example, as shown in FIG. 6B or 6C, the densities of the patterns formed on the third and fourth inclined surfaces 93 and 94 are the same as each other, and the densities of the patterns formed on the fifth and seventh inclined surfaces 95 and 97. The densities are the same, and the densities of the patterns formed on the sixth and eighth inclined surfaces 96 and 98 may be the same.

Alternatively, the density of the predetermined pattern on the inner side surface of the second side wall 74 may be different for each of the plurality of inclined surfaces. For example, as shown in FIG. 6B, the densities of the patterns formed on the fourth, seventh, and eighth inclined surfaces 94, 97, and 98 are different from each other, and the third, fifth, and sixth inclined surfaces 93, 95 and 96) the densities of the patterns formed on each other are different.

In addition, at least one of the inclined surfaces of the plurality of inclined surfaces formed on the inner side surface of the second sidewall 74 may have a predetermined pattern having different densities. That is, the pattern formed on one inclined surface may have various pattern densities. For example, as shown in FIG. 6A, the density of the pattern formed in the central portion 74b of the first inclined surface 91 is dense, while the density of the pattern formed in the edge portion 74a is small.

6A to 6C, a predetermined pattern may be formed to be symmetrical with respect to the central portion 74b of the second sidewall 74, but the present embodiment is not limited thereto.

According to the embodiment, the above-described predetermined pattern formed on the inner side surface of the second side wall 74 may be in the form of recesses or protrusions, but if not limited thereto, various types of patterns may be formed on the inner side surface. have.

7 is a bottom perspective view of the bottom cover 70 including the second reflector 82 according to the embodiment.

As shown in FIG. 7, the bottom cover 70 may provide a plurality of reinforcing ribs 71 on its lower surface. The reason for this is that the second reflector 82 is a reflective surface having a curved surface, and may be deformed by external environmental conditions. Therefore, reinforcing ribs 71 are installed to prevent this. The reinforcing ribs 71 may be disposed not only on the rear surface facing the inclined surface of the second reflecting portion 82 but also on the rear surface facing the side of the second reflecting portion 82.

In addition, the bottom cover 70 may further include a support pin 79 supporting the optical member 40 on the upper surface of the second reflector 82. Since the optical member 40 is spaced apart from the second reflecting portion 82, and an air guide is formed therebetween, the support pin 79 is formed because the central region of the optical member 40 can sag downward. . To this end, the support pin 79 may be stable to form an area of the lower surface that is in contact with the second reflector 82 is larger than the area of the upper surface.

8 illustrates a display module having a backlight unit according to an embodiment.

As shown in FIG. 8, the display module 200 may include a display panel 210 and a backlight unit 220.

The display panel 210 includes a color filter substrate 212 and a thin film transistor (TFT) substrate 214 bonded to face each other so that a uniform cell gap is maintained. The display panel 210 includes two substrates 212 and 214. A liquid crystal layer (not shown) may be interposed therebetween.

In addition, an upper polarizer 216 and a lower polarizer 218 may be disposed on the upper and lower sides of the display panel 210, and more specifically, the upper polarizer 216 is disposed on the upper surface of the color filter substrate 212. The lower polarizer 218 may be disposed on the bottom surface of the TFT substrate 214.

Although not shown, a gate and a data driver for generating a driving signal for driving the panel 210 may be provided at the side of the display panel 210.

9 and 10 illustrate a display apparatus according to an embodiment.

Referring to FIG. 9, the display apparatus 300 includes a display module 200, a front cover 310 surrounding the display module 200, a back cover 320, and a driver 330 provided in the back cover 320. And a driving unit cover 340 surrounding the driving unit 330.

The front cover 310 may include a front panel (not shown) of a transparent material that transmits light, and the front panel protects the display module 200 at regular intervals, and the light emitted from the display module 200. The light is transmitted through the display module 200 so that the image displayed on the display module 200 is viewed from the outside.

The back cover 320 may be combined with the front cover 310 to protect the display module 200.

The driving unit 330 may be disposed on one surface of the back cover 320.

The driving unit 330 may include a driving control unit 332, a main board 334, and a power supply unit 336.

The driving controller 332 may be a timing controller, and is a driving unit for adjusting an operation timing of each driver IC of the display module 200. The main board 334 is a driver for transmitting V sink, H sink, and R, G, and B resolution signals to the timing controller. The power supply unit 336 is a driving unit for applying power to the display module 200.

The driver 330 may be provided in the back cover 320 and may be surrounded by the driver cover 340.

The back cover 320 may be provided with a plurality of holes to connect the display module 200 and the driving unit 330, and may be provided with a stand 350 supporting the display device 300.

On the other hand, as shown in FIG. 10, the driving controller 332 of the driving unit 330 may be provided in the back cover 320, and the main board 334 and the power supply unit 336 may be provided in the stand 350. have.

In addition, the driving unit cover 340 may wrap only the driving control unit 332 provided in the back cover 320.

In the exemplary embodiment, the main board 334 and the power supply unit 336 are separately configured, but may be formed as one integrated board, but is not limited thereto.

Another embodiment may be implemented as a display device, an indicator device, and an illumination system including the backlight unit described in the above-described embodiments, for example, the light source module 10, the first and second reflectors 80 and 82. For example, the lighting system may include a lamp, a street lamp.

Such a lighting system can be used as a lighting lamp that focuses a plurality of LEDs to obtain light, and in particular, can be used as a recessed light (down light) that is embedded in a ceiling or a wall of a building so that the opening side of the shade can be exposed to be exposed. have.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood 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.

10: light source module 30, 70: bottom cover
32, 82: second reflecting portion 40: optical member
50: cover plate 60: panel support
71: reinforcing rib 72: first side wall
73: tip portion 74: second side wall
79: support pin 91-102: inclined surface
110: pattern 200: display module
212 and 214: substrate 216: upper polarizing plate
218: lower polarizer 220: backlight unit
300: display device 310: front cover
320: back cover 330: drive unit
340: drive unit cover 350: stand

Claims (20)

First and second reflectors;
At least one light source module disposed between the first and second reflectors; And
A bottom cover supporting the second reflector,
The bottom cover is
A first sidewall on which the light source module is disposed in a first direction; And
And a second sidewall extending from a distal end of the first sidewall in a second direction different from the first direction, wherein an inner side surface of the second sidewall protrudes more inwardly than the center portion of an edge portion closer to the distal end portion. Backlight unit. The backlight unit of claim 1, wherein the protruding degree of the inner side surface of the second sidewall increases linearly from the center portion toward the edge portion. The backlight unit of claim 1, wherein the protruding degree of the inner side surface of the second sidewall increases nonlinearly from the center portion to the edge portion. The backlight unit of claim 1, wherein the edge portion of the inner side surface of the second sidewall protrudes 27 mm to 37 mm more inwardly than the central portion. The light source module of claim 1, wherein the light source module includes a light source and a circuit board on which the light source is mounted.
The light source is disposed in the backlight unit is spaced apart by 2mm to 12mm from the front end of the first side wall. The backlight unit of claim 1, wherein an inner surface of the second sidewall has a plurality of inclined surfaces adjacent to at least one inflection portion. The backlight unit of claim 6, wherein the inflection portion is positioned at a central portion of the inner surface. The backlight unit of claim 6, wherein the inflection portion is located closer to the distal end portion of the first sidewall than the central portion on the inner side surface of the second sidewall. The backlight unit of claim 6, wherein the inflection portion is located farther from the distal end portion of the first sidewall than the central portion on the inner side surface of the second sidewall. The backlight unit of claim 6, wherein radii of curvature of the plurality of inclined surfaces are different from each other. The backlight unit of claim 6, wherein slopes of the plurality of inclined surfaces are different from each other. The backlight unit of claim 6, wherein the plurality of inclined surfaces are formed to be symmetrical with respect to the central portion of the second side wall.  The backlight unit of claim 1, wherein an inner surface of the second sidewall has a predetermined pattern. The backlight unit of claim 13, wherein the density of the predetermined pattern decreases toward the edge portion of the second sidewall and becomes dense toward the center portion. The backlight unit of claim 13, wherein the density of the predetermined pattern is different for each of the plurality of inclined surfaces. The backlight unit of claim 13, wherein at least one slope of the plurality of slopes has the predetermined pattern having a different density. The backlight unit of claim 13, wherein the predetermined pattern is formed to be symmetric with respect to a central portion of an inner side surface of the second side wall. The backlight unit of claim 13, wherein the predetermined pattern is in the form of a recess. The backlight unit of claim 13, wherein the predetermined pattern has a protrusion shape. 20. An illumination system comprising the backlight unit of claim 1.

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