KR20130063300A - Backlight unit, display apparatus using the same, and lighting apparatus including the same - Google Patents

Abstract

PURPOSE: A backlight unit, a display apparatus using the same, and a lighting apparatus including the same are provided to attach and maintain a reflecting part to/in a bottom cover by forming cutting parts in the reflecting part to reduce the tension applied to the reflecting part. CONSTITUTION: A second reflecting part(300) is arranged in a first direction and has a cutting part(310) extended towards a second direction different from the first direction. The inclined surface of a bottom cover(700) intersects with an inflection part extended towards the second direction. The bottom cover supports the second reflecting part. At least one light source(100) is arranged between the first reflecting part(200) and the second reflecting part. [Reference numerals] (AA) Second direction; (BB) First direction

Description

BACKLIGHT UNIT, DISPLAY APPARATUS USING THE SAME, AND LIGHTING APPARATUS INCLUDUS THE SAME}

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

1 is a cross-sectional view of a general two-edge type backlight unit, which includes a light source module 10, a first reflector 20, a second reflector 30, a cover plate 40, and a bottom. It consists of a cover (or bottom chassis) 50.

Referring to FIG. 1, the light source module 10 may include a light emitting element 12 for generating light and a circuit board 14 having an electrode pattern. The first reflector 20 reflects the light generated by the light emitting element 12 in the direction of the second reflector 30. The cover plate 40 supports the light source module 10 and the first reflector 20, and the bottom cover 50 supports the second reflector 30.

The second reflector 30 is attached to the bottom cover 50 by a structure such as a double-sided tape or a hook. In this case, the second reflector 30 may be separated from the bottom cover 50 in the direction of the arrow due to the tension according to the thickness of the second reflector 30. .

Republic of Korea Patent Publication No. 100-2011-01008832 ("Light emitting device, light unit and display device having the same", published October 06, 2011)

Embodiments provide a backlight unit capable of reducing a phenomenon that a reflector attached to a bottom cover is to be separated from the bottom cover, a display device using the same, and a lighting device including the same.

The backlight unit of the embodiment includes a first reflector; A second reflector arranged in a first direction and having a plurality of cutouts extending in a second direction different from the first direction; A bottom cover having a plurality of inclined surfaces that meet each other at the inflection portion extending in the second direction and supporting the second reflection portion; And at least one light source disposed between the first reflecting portion and the second reflecting portion. The second reflector may be in the form of a sheet, the plurality of cutouts may be arranged parallel to each other in the first direction, and the first direction and the second direction may be perpendicular to each other.

In addition, the cutout may pass through the second reflector. In this case, the cutout may include at least one slit extending in a line in the second direction.

In addition, each of the plurality of cutouts may include at least one cutout line extending in a line in the second direction.

Alternatively, the cutout may not penetrate the second reflector. In this case, the depth of the cutout may be 10 to 90% of the thickness of the second reflector.

The second reflector may further include a bottom surface facing the bottom cover; And an upper surface opposite the lower surface. The cutout may be formed on the lower surface or the upper surface. Alternatively, the cut portion may be at least one first cut line formed on the upper surface; And at least one second incision formed on the bottom surface.

The first cut line and the second cut line may be aligned with each other along the thickness direction of the second reflector. In this case, the sum of the depth of the first incision line and the depth of the second incision line may be 10 to 90% of the thickness of the second reflector.

Alternatively, the first incision line and the second incision line may be misaligned with each other along the thickness direction of the second reflector.

In addition, the depth of the first incision line and the depth of the second incision line may be different or the same.

In addition, the distance between the plurality of cutouts may be constant, may be inversely proportional to the thickness of the second reflecting portion, and may vary depending on the position of the bottom cover.

For example, the spacing between the plurality of cutouts may be closer to the inflection part and smaller as it is farther from the inflection part, may be proportional to the curvature of the inclined surface, and may be It may be dense and further away from the central region.

Embodiments may form a plurality of cutouts on the reflecting portion attached to the bottom cover to reduce the tension applied thereto, thereby stably attaching and maintaining the reflecting portion on the bottom cover, thereby improving reliability of the backlight unit.

1 is a cross-sectional view of a typical two-edge type backlight unit.
2A to 2C are diagrams for describing a two-edge type backlight unit according to an embodiment.
3A and 3B show various patterns of the second reflector according to the embodiment as a plan view.
4 is an enlarged plan view of a portion 'A' or 'B' illustrated in FIG. 3A or 3B, respectively.
5A to 5F are cross-sectional views illustrating various patterns of the second reflector according to another embodiment.
6A and 6B are enlarged cross-sectional views of portions 'C' and 'D' shown in FIGS. 5E and 5F, respectively.
7 illustrates a display module having a backlight unit according to an embodiment.
8 and 9 illustrate a display device 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 to 2C are diagrams for describing a two-edge type backlight unit according to an embodiment. FIG. 2A is a top perspective view of the backlight unit, FIG. 2B is a bottom perspective view of the backlight unit, and FIG. 2C is a cross-sectional view of the backlight unit. . For better understanding of the present embodiment, it is assumed that the cutout 310 of the backlight shown in FIGS. 2A to 2C has a shape as shown in FIG. 5B. However, the cutout 310 illustrated in FIGS. 2A to 2C may have a different shape.

As shown in FIGS. 2A to 2C, the backlight unit includes at least one light source module 100, a first reflector 200, a second reflector 300, and an optical member 400. ), A cover plate 500, a panel support 600, and a bottom cover (or bottom chassis) 700.

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

In some cases, the light source module 100 may be disposed at a distance from the second reflector 300 at the same time as being in contact with the first reflector 200, or at the same time as being in contact with the second reflector 300. 1 may be disposed away from the reflecting unit 200 by a predetermined interval.

Alternatively, the light source module 100 may be disposed apart from the first reflecting unit 200 and the second reflecting unit 300 by a predetermined distance, or simultaneously with the first reflecting unit 200 and the second reflecting unit 300. May be contacted.

If the light source module 100 is spaced apart from the first reflector 200 by a first distance and spaced apart from the second reflector 300 by a second distance, the second distance may be greater or smaller than the first distance. Can be. The reason for this is to concentrate the light generated by the light source module 100 in the central region of the second reflector 300 to increase the luminance in the central region of the backlight unit.

The light source module 100 may include a circuit board having an electrode pattern and a light emitting device for generating light. In this case, at least one light emitting device may be mounted on the circuit board, and an electrode pattern for connecting the power supply adapter and the light emitting device may be formed.

For example, a carbon nanotube electrode pattern for connecting the light emitting device 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 emitting device 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. It may also be configured in a package form combining at least one or more of a chip, a 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.

In addition, the light exit surface of the light source module 100 may be arranged in various directions.

That is, the light source module 100 may be a direct emitting type structure in which the light emitting surface is disposed to face an air guide direction between the optical member 400 and the second reflector 300. have. Alternatively, the light source module 100 may have an indirect emission type structure in which the light exit surface is disposed in one of the directions of the first reflector 200, the second reflector 300, and the cover plate 500. . Here, the indirect light source module 100 is emitted light is reflected from the first reflector 200, the second reflector 300 and the cover plate 500, the reflected light is again the air guide of the backlight unit You can go in the direction. As such, the reason for arranging the light source module 100 in an indirectly emitting structure is that a hot spot phenomenon can be reduced.

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. .

Here, the first reflector 200 may have an open area and may be disposed in contact with one side of the light source module 100 or spaced at a predetermined interval. That is, the central region of the first reflector 200 may be opened, and the light source module 100 may be disposed to face each other at both edge regions of the first reflector 200.

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. have.

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 reflective pattern may be flat or curved.

The reason for forming the reflective 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, thereby increasing the luminance in the central region of the backlight unit. To do so.

Meanwhile, the bottom cover 700 supporting the second reflector 300 and to which the second reflector 300 is attached will be described below.

The bottom cover 700 may have an inclined surface that is inclined at an angle from a horizontal plane parallel to the surface of the first reflector 200. That is, the bottom cover 700 may include a plurality of first and second inclined surfaces 701 and 703 which meet each other at the inflection portion P extending in the first direction. In some cases, the center area of the bottom cover 700 may be a flat plane, a concave curved surface or a convex curved surface, or may include a plurality of shapes.

The bottom cover 700 may not be parallel to the first reflector 200, and may be at least one of a flat surface, a flat slope, a concave slope, and a convex slope.

In addition, the first and second inclined surfaces 701 and 703 of the bottom cover 700 are formed to be symmetrical with respect to the center area thereof. The curvature radii R1 and R2 of the first and second inclined surfaces 701 and 703 which are adjacent to each other adjacent to the inflection portion P in the bottom cover 700 may be different from each other.

In addition, although the inflection portion P between the first and second inclined surfaces 701 and 703 of the bottom cover 700 may be located in an area adjacent to the light source module 100, it is far from the light source module 100. May be located in the area.

The first inclined surface 701 is adjacent to the light source module 100, and the radius of curvature R1 of the first inclined surface 701 may be smaller or larger than the radius of curvature R2 of the second inclined surface 703. have. In some cases, the radius of curvature R1 of the first inclined surface 701 may be the same as the radius of curvature R2 of the second inclined surface 703.

If the radius of curvature R1 of the first inclined surface 701 adjacent to the light source module 100 is smaller than the radius of curvature R2 of the second inclined surface 703, the inflection portion P is applied to the light source module 100. It will be located in the area of the adjacent bottom cover 700. However, if the radius of curvature R1 of the first inclined surface 701 adjacent to the light source module 100 is larger than the radius of curvature R2 of the second inclined surface 703, the inflection portion P may be the light source module 100. It will be located in the area of the bottom cover 700 away from it. Here, the ratio of the radius of curvature R1 of the first inclined surface 701 and the radius of curvature R2 of the second inclined surface 703 may be 1: 0.1-10.

The first distance value D1 between the first horizontal line connecting the inflection part P and the second horizontal line connecting one end of the first inclined surface 701 is the first horizontal line connecting the inflection part P and the first horizontal value. The second distance value D2 between the third horizontal lines connecting one end of the two inclined surfaces 703 may be equal to, smaller, or larger. Here, the ratio of the first distance value D1 and the second distance value D2 may be 1: 0.01-5.

Further, the third distance value D3 between the first vertical line connecting the inflection part P and the second vertical line connecting one point of the end of the first inclined surface 701 is the first vertical line and the second vertical line connecting the inflection point P. It may be smaller than the fourth distance value D4 between the third vertical lines connecting one point of the end of the inclined surface 703, may be larger, or may be the same in some cases. Here, the ratio of the third distance value D3 and the fourth distance value D4 may be 1: 0.05-20.

Subsequently, the fifth distance value D5 between the first horizontal line connecting the inflection part P and the fourth horizontal line connecting one point of the light source module 100 may be equal to or larger than the second distance value D2. have.

The first reflector 200 includes a first end adjacent to the light source module 100 and a second end facing the first end, and the sixth distance value D6 between the first end and the second end is About 3-30 mm.

Subsequently, the seventh distance value D7 between the first vertical line connecting the inflection point P and the fourth vertical line connecting the second end of the first reflecting unit 200 may be greater than the sixth distance value D6. .

Next, the second reflector 300 is disposed on the inner surface of the bottom cover 700 spaced apart from the light source module 100 by a predetermined interval. Here, the second reflector 300 may serve to reflect the light generated from the light source module 100 or the light reflected from the first reflector 200 to the open area of the first reflector 200. have.

The second reflector 300 may be in the form of a sheet, such as a reflective film, and may be attached to an inner surface of the bottom cover 700 having the inclined surfaces 701 and 703 as described above. Therefore, as illustrated in FIGS. 2A to 2C, the inner surfaces of the second reflector 300 and the bottom cover 700 have the same structure. That is, the second reflector 300 also has first and second inclined surfaces adjacent to the inflection portion, and is formed to be symmetric with respect to the central region 320 of the 300.

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 reflection patterns of the first reflector 200 and the second reflector 300 may be different from each other. That is, the first reflector 200 may have a specular reflection surface that specularly reflects light, and the second reflector 300 may have a diffuse reflection surface that diffusely reflects light. Alternatively, the first reflector 200 may have a diffuse reflection surface that diffusely reflects light, and the second reflector 300 may have a specular reflection surface that specularly reflects light.

In some cases, the second reflector 300 may arrange the specular reflection surface in an area adjacent to the light source module 100, and may arrange the diffuse reflection surface in an area far from the light source module 100.

As described above, when the second reflector 300 in the form of a sheet is attached to the inner surface of the bottom cover 700 by a structure such as a double-sided tape (not shown) or a hook, the second reflector 300 may be tensioned. ) Tends to separate from the bottom cover 700. In order to prevent this, the second reflector 300 according to the embodiment may include a plurality of cutouts 310 as illustrated in FIGS. 2A to 2C.

The cutouts 310 are arranged in a first direction and extend in a second direction different from the first direction. For example, the second direction may be perpendicular to the first direction. However, this embodiment is not limited to this. In addition, when the plurality of cutouts 310 are arranged in the first direction, they may be arranged in parallel.

Hereinafter, the second reflector 300 including the cutout 310 according to the exemplary embodiment will be described in detail with reference to the accompanying drawings.

3A and 3B show various patterns of the second reflector 300 according to the embodiment as a plan view.

The second reflector 300 has a plurality of cutouts 310 arranged in the first direction and extending in the second direction.

According to an embodiment, each of the cutouts 310 is one seamless cutout extending in the second direction as shown in FIG. 3A.

However, according to another embodiment, each of the cutouts 310 may include a plurality of cutoff lines 310a, 310b, 310c, and 310d extending in a second direction as shown in FIG. 3B. .

In this case, the spacing between the plurality of cutouts 310 may be the same. In addition, the distance between the plurality of cutouts 310 may be inversely proportional to the thickness d1 of the second reflector 300. That is, when the thickness d1 of the second reflector 300 is thick, the interval between the plurality of cutouts 310 is narrow, and when the thickness d1 of the second reflector 300 is thin, the plurality of cutouts ( The spacing between 310 may be wide. This is because the thicker the thickness d1 of the second reflector 300 is, the stronger the tendency of the second reflector 300 to be spaced apart from the bottom cover 700 due to tension. Therefore, as the thickness d1 of the second reflector 300 becomes thicker, the gap between the cutouts 310 is narrowed to decrease the tension.

In addition, the interval between the plurality of cutouts 310 may be proportional to the curvatures R1 and R2 of the inclined surfaces 701 and 703 formed on the inner surface of the bottom cover 700. That is, the larger the curvature R1 and R2 of the inclined surfaces 701 and 703, the larger the interval between the plurality of cutouts 310, and the smaller the curvature R1 and R2 of the inclined surfaces 701 and 703, the smaller the plurality of cutouts The spacing between 310 is small. This is because the smaller the curvatures R1 and R2 of the inclined surfaces 701 and 703, the stronger the tendency of the second reflector 300 to be spaced apart from the bottom cover 700 due to tension. Therefore, as the curvature R1 is smaller, the gap between the cutouts 310 is narrowed to attenuate the tension.

In addition, the interval between the plurality of cutouts 310 may vary depending on the position of the bottom cover 700.

For example, the spacing between the plurality of cutouts 310 may be closer to the inflection portion P as shown in FIG. 3A or 3B, and may be smaller as the distance from the inflection portion P increases. This is because the closer the inflection P is, the stronger the tension is, and the tendency of the second reflector 300 to be separated from the bottom cover 700 is stronger.

In addition, the spacing between the plurality of cutouts 310 is pushed in the center area 320 of the second reflecting part 300 as shown in FIG. 3A or 3B, and becomes smaller as the distance from the center area 320 is increased. It may be. This is because the closer the center region 320 is, the stronger the tension is, and thus the tendency for the second reflector 300 to be separated from the bottom cover 700 may be stronger.

4 is an enlarged plan view of a portion 'A' or 'B' illustrated in FIG. 3A or 3B, respectively.

The cutout 310 illustrated in FIG. 3A or 3B may be formed through the second reflector 300. In this case, as shown in FIG. 4, the cutout 310 may include at least one slit 331 to 336 extending in a line in the second direction.

3A, when each of the cutouts 310 is one cut line 310 extending in a second direction without interruption, the slits 331 to 336 shown in FIG. It is included in one seamless cut line 310 shown in.

However, as shown in FIG. 3B, when each of the cutouts 310 is formed of a plurality of cutoff lines 310a to 310d extending in the second direction, the slits 331 to 336 shown in FIG. 4 are cut off. It may be included in one cut line 310a.

5A to 5F illustrate various patterns of the second reflector 300 according to another embodiment as a cross-sectional view.

According to another embodiment, as shown in FIGS. 5A to 5F, each of the plurality of cutouts 310 of the second reflector 300 may be formed without passing through the second reflector 300.

When each of the cutouts 310 is formed without passing through the second reflector 300, the depth of the cutout 310 may be 10 to 90% of the thickness d1 of the second reflector 300. .

The reflector 300 illustrated in FIGS. 2C and 5A to 5F includes a lower surface 300b facing the bottom cover 700 and an upper surface 300a opposite to the lower surface 300b.

In some embodiments, the cutout 310 is formed on the bottom surface 300b of the second reflector 300, as shown in FIG. 5A or 5C. Alternatively, the cutout 310 may be formed on the upper surface 300a of the second reflector 300 as shown in FIG. 5B or 5D.

In addition, the interval w1 between the plurality of cutouts 310 may be the same as illustrated in FIGS. 5A and 5B.

Alternatively, the spacing between the plurality of cutouts 310 may vary depending on the position of the bottom cover 700 as shown in FIGS. 5C and 5D.

For example, the spacing between the plurality of cutouts 310 may be closer to the inflection portion P as shown in FIG. 5C, and may be smaller as the distance from the inflection portion P increases. That is, the distance w2 between the cutouts 310 in the inflection portion P and the region adjacent thereto is greater than the distance w3 between the cutouts 310 in the region located far from the inflection portion P. You can write it down. The reason is as described above.

In addition, the spacing between the plurality of cutouts 310 may be close to the center region 320 of the second reflector 300 as shown in FIG. 5D, and may be smaller as the distance from the center region 320 is increased. That is, the spacing w4 between the cutouts 310 in the central region 320 and the region near the 320 is greater than the spacing w5 between the cutouts 310 in the region located far from the center region 320. You can write it down. The reason is as described above.

In addition, as illustrated in FIG. 5E or 5F, the cutout 310 may be formed on both the upper surface 300a and the lower surface 300b of the second reflector 300.

That is, referring to FIG. 5E or 5F, the cutout 310 of the second reflector 300 may include at least one first cut line 330a and a bottom 300b formed on the upper surface 300a. It may include a second incision 330b.

According to an embodiment, as shown in FIG. 5E, the first cut line 330a and the second cut line 330b may be aligned with each other along the thickness direction of the second reflector 300. .

Alternatively, as shown in FIG. 5F, the first cut line 330a and the second cut line 330b may be misaligned with each other along the thickness direction of the second reflector 300. .

6A and 6B are enlarged cross-sectional views of portions 'C' and 'D' shown in FIGS. 5E and 5F, respectively, and reference numeral 340 denotes the second reflector 300 on the bottom cover 700. It is a coupling part to attach. For example, the coupling part 340 may be implemented with a double-sided tape or a hook.

5E and 6A, the depth d2 of the first cut line 330a may be different from or the same as the depth d3 of the second cut line 330b.

Alternatively, referring to FIGS. 5F and 6B, the depth d2 of the first cut line 330a may be different from or the same as the depth d3 of the second cut line 330b.

Each of the depths d2 and d3 illustrated in FIGS. 6A and 6B may be 10 to 90% of the total thickness d1 of the second reflector 300 as described above. In particular, in the case of FIG. 6A, the sum d2 + d3 of the depth d2 of the first cut line 330a and the depth d3 of the second cut line 330b is equal to the total thickness of the second reflector 300. It may be 10 to 90% of (d1).

Meanwhile, referring to FIGS. 2A to 2C, the optical member 400 may be supported by the cover plate 500 and disposed to face the second reflector 300. Here, the optical member 400 may include at least one sheet, and may 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 400 may have a concave-convex shape for uniform diffusion of light.

Next, the cover plate 500 may be fixed to each other by contacting the first reflector 200 and the second reflector 300. Here, the material of the cover plate 500 may be different from the material of the bottom cover 700. That is, the cover plate 500 may be made of metal, and the bottom cover 700 may be made of a polymer resin such as plastic to enable injection molding.

The panel support part 600 covers a part of the cover plate 500, and may be fixed to the cover plate 500.

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

As shown in FIG. 7, the display module 800 may include a display panel 810 and a backlight unit 820.

The display panel 810 includes a color filter substrate 812 and a thin film transistor (TFT) substrate 814 bonded to face each other to maintain a uniform cell gap. The display panel 810 includes two substrates 812 and 814. A liquid crystal layer (not shown) may be interposed therebetween.

In addition, an upper polarizer 816 and a lower polarizer 818 may be disposed on the upper and lower sides of the display panel 810, and more specifically, the upper polarizer 816 is disposed on an upper surface of the color filter substrate 812. The lower polarizer 818 may be disposed on the bottom surface of the TFT substrate 814.

Although not shown, a gate and a data driver for generating a driving signal for driving the panel 810 may be provided at the side of the display panel 810.

8 and 9 illustrate a display device according to an embodiment.

Referring to FIG. 8, the display apparatus 900 includes a display module 800, a front cover 910 surrounding the display module 800, a back cover 920, and a driver 930 provided in the back cover 920. And a driving unit cover 940 surrounding the driving unit 930.

The front cover 910 may include a front panel (not shown) of a transparent material that transmits light, and the front panel protects the display module 800 at regular intervals, and the light emitted from the display module 800. Through the transmission, the image displayed on the display module 800 is viewed from the outside.

The back cover 920 may be combined with the front cover 910 to protect the display module 800.

The driving unit 930 may be disposed on one surface of the back cover 920.

The driver 930 may include a drive controller 932, a main board 934, and a power supply unit 936.

The driving controller 932 may be a timing controller, and is a driving unit for adjusting an operation timing of each driver IC of the display module 800. The main board 934 is a driver that transfers V sink, H sink, and R, G, and B resolution signals to the timing controller. The power supply unit 936 is a driving unit for applying power to the display module 800.

The driver 930 may be provided in the back cover 920 and may be surrounded by the driver cover 940.

The back cover 920 may be provided with a plurality of holes to connect the display module 800 and the driver 930, and a stand 950 for supporting the display apparatus 900 may be provided.

On the other hand, as shown in FIG. 9, the driving controller 932 of the driving unit 930 may be provided in the back cover 920, and the main board 934 and the power board 936 may be provided in the stand 950. have.

In addition, the driver cover 940 may wrap only the driver 930 provided in the back cover 920.

In an embodiment, the main board 934 and the power board 936 are configured separately, but may be formed of one integrated board, but is not limited thereto.

Meanwhile, the above-described embodiment of the backlight unit may be included in various lighting devices.

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, 100: light source module 20, 200: first reflecting unit
30, 300: second reflecting portion 40, 400: optical member
50, 700: bottom cover 310: incision
320: center region 330a: first incision
330b: second incision 500: cover plate
600: panel support 800: display module
812, 814: substrate 816: upper polarizer
818: lower polarizer 820: backlight unit
910: front cover 920: back cover
930: drive unit 940: drive unit cover
950: stand

Claims (25)

A first reflector;
A second reflector arranged in a first direction and having a plurality of cutouts extending in a second direction different from the first direction;
A bottom cover having a plurality of inclined surfaces that meet each other at the inflection portion extending in the second direction and supporting the second reflection portion; And
And at least one light source disposed between the first reflecting portion and the second reflecting portion. The backlight unit of claim 1, wherein the second reflector is in the form of a sheet. The backlight unit of claim 1, wherein the plurality of cutouts are arranged in parallel to each other in the first direction. The backlight unit of claim 1, wherein the first direction and the second direction are perpendicular to each other. The backlight unit of claim 1, wherein the cutout is formed through the second reflector. The method of claim 5, wherein the incision is
And at least one slit extending in a row in the second direction. The method of claim 1, wherein each of the plurality of incisions
And at least one incision line extending in a line in the second direction. The backlight unit of claim 1, wherein the cutout is formed without passing through the second reflector. The backlight unit of claim 8, wherein the depth of the cutout is 10 to 90% of a thickness of the second reflector. The method of claim 5, wherein the second reflector
A lower surface facing the bottom cover; And
And a top surface opposite to the bottom surface. The backlight unit of claim 10, wherein the cutout is formed on the bottom surface. The backlight unit of claim 10, wherein the cutout is formed on the upper surface. The method of claim 10, wherein the incision is
At least one first incision formed on the upper surface; And
And at least one second incision formed on the bottom surface. The backlight unit of claim 13, wherein the first incision line and the second incision line are aligned with each other along a thickness direction of the second reflector. The backlight unit of claim 14, wherein a sum of the depth of the first incision line and the depth of the second incision line is 10 to 90% of the thickness of the second reflector. The backlight unit of claim 13, wherein the first incision line and the second incision line are misaligned with each other along a thickness direction of the second reflector. The backlight unit of claim 13, wherein a depth of the first incision line and a depth of the second incision line are different from each other. The backlight unit of claim 13, wherein a depth of the first cut line and a depth of the second cut line are the same. The backlight unit of claim 1, wherein a distance between the plurality of cutouts is constant. The backlight unit of claim 1, wherein an interval between the plurality of cutouts is inversely proportional to a thickness of the second reflector. The backlight unit of claim 1, wherein an interval between the plurality of cutouts is different depending on a position of the bottom cover. The backlight unit of claim 1, wherein a distance between the plurality of cutouts is closer to the inflection portion and smaller toward the inflection portion. The backlight unit of claim 1, wherein an interval between the plurality of cutouts is proportional to a curvature of the inclined surface. The backlight unit of claim 1, wherein an interval between the plurality of cutouts is close to a center region of the second reflecting portion and further away from the center region. An illuminating device comprising the backlight unit according to any one of claims 1 to 24.

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