KR101880135B1 - Backlight unit and display using the same - Google Patents

Abstract

A backlight unit and a display device using the same, wherein the backlight unit includes a first reflector; A bottom cover disposed under the first reflector and having a projection on the side wall portion; A second reflector formed on an inner surface of the bottom cover; And at least one light source module disposed between the first reflector and the second reflector.

Description

BACKLIGHT UNIT AND DISPLAY DEVICE USING THE SAME

The embodiment relates to a backlight unit and a display device using the same.

In general, a typical large-sized display device includes a liquid crystal display (LCD) or a plasma display panel (PDP).

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

The backlight unit used in the LCD is divided into an edge type backlight unit and a direct-type backlight unit according to the position of the light source. In the edge type, a light source is disposed on the right and left sides and / It is possible to uniformly distribute the light uniformly over the entire surface, thereby making it possible to reduce the thickness of the panel.

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

A cold cathode fluorescent lamp (CCFL) was used as a light source for the backlight unit of the conventional edge type or direct type. However, since the backlight unit using CCFL is always supplied with power to the CCFL, a considerable amount of power is consumed. In addition to having a color reproduction ratio of about 70% as compared with a cathode ray tube (CRT) There are disadvantages that cause environmental pollution problems.

BACKGROUND ART [0002] As a substitute product for solving the above problem, research on a backlight unit using a light emitting diode (LED) has been actively conducted.

When the LED is used as a backlight unit, it is possible to partially turn on / off the LED array, which can drastically reduce power consumption, Green, and B: Blue) LEDs can deliver more vivid image quality to consumers, exceeding 100% of the National Television System Committee (NTSC) color gamut specification.

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

Currently, LCD products employing LEDs having the above advantages are being marketed. However, since the conventional CCFL light source and driving mechanism are different, a driving driver and a printed circuit board (PCB) are expensive. Therefore, the LED backlight unit is only applied to expensive LCD products.

1 shows a plan view of a reflector 32 formed on a light source module 10 and 12 and a bottom cover 30 in a general two-edge type backlight unit.

The light source modules 10 and 12 shown in Fig. 1 may include a circuit board having an electrode pattern and a light emitting device for generating light. At this time, in the outer peripheral region of the center of the bottom cover 30 where the light emitted from the light source modules 10 and 12 is far away from the other portions and the diffuse reflection occurs less than the other portions, B) may be formed. Therefore, improvement of the arm portions A and B is required.

Korean Patent Publication No. 10-2007-0040012

Embodiments provide a backlight unit having a structure for improving an arm portion and a display device using the same.

The backlight unit of the embodiment includes: a first reflector; A bottom cover disposed under the first reflector and having a projection on a side wall portion; A second reflector formed on an inner surface of the bottom cover; And at least one light source module disposed between the first reflector and the second reflector.

The bottom cover further includes at least one edge portion extending in a first direction, the protrusion extending in a second direction different from the first direction from the tip portion of the edge portion, and protruding further than the tip portion. The at least one light source module is disposed extending in the first direction along the edge portion.

The projection projects locally at a portion of the side wall portion. A portion of the side wall portion may be a central portion of the side wall portion. Alternatively, the protruding portion protrudes over the entire length of the side wall portion.

The protrusions gradually protrude from the edge portion and protrude to a uniform extent along the second direction. The protruding portion locally protrudes from the bottom surface of the bottom cover at a portion where a plurality of inclined surfaces are in contact with each other. The protrusion may protrude in at least one of hemispherical shape, triangular shape, square shape, trapezoid shape, and polygonal shape.

The backlight unit further includes a top cover that covers the edge of the top of the backlight unit, and the protrusion protrudes to a portion covered by the top cover.

The protrusions may protrude in different shapes above and below the observable depth.

Above the observable depth, the protrusion may protrude to a portion covered by the top cover, and below the observable depth, the protrusion may protrude more than the portion covered by the top cover.

Above the observable depth, the protrusions protrude to a convex, concave or even degree, and below the observable depth, the protrusions can protrude to a convex, concave or even degree.

The protruding width of the protrusion may be 1 to 5 mm or less.

Embodiments can provide uniform brightness because the bottom cover protrudes from the edge portion of the backlight unit of the edge type, thereby improving the reliability of the backlight unit.

1 shows a plan view of a reflector formed on a light source module and a bottom cover in a general two-edge type backlight unit.
2A and 2B are views for explaining a two-edge type backlight unit according to the embodiment.
FIG. 3A is a perspective view of a bottom cover according to an embodiment, and FIG. 3B is a plan view schematically showing a combined top view of a bottom cover and at least one light source module according to an embodiment.
4 is a cross-sectional view of the bottom cover shown in FIG.
5 is a cross-sectional view of the bottom cover and the light source module shown in FIG.
6A to 6D show various plan views of protrusions formed on the bottom cover according to the embodiment.
Figs. 7A to 8F show partial sectional views of the bottom cover shown in Fig. 3B taken along the line 4-4 '.
Figure 9 shows a perspective view of the bottom cover with the support pin.
10 is a view showing a display module having a backlight unit according to an embodiment.
11 and 12 are views showing a display device according to an embodiment.

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

In the description of this embodiment, in the case of being described as being formed on the "upper" or "on or under" of each element, on or under is meant to encompass both that the two elements are in direct contact with each other or that one or more other elements are indirectly formed between the two elements do.

Also, when expressed as "on" or "on or under", it may include not only an upward direction but also a downward direction with respect to one element.

2A and 2B are diagrams for explaining a two-edge type backlight unit according to the embodiment, wherein FIG. 2A is a top perspective view of the backlight unit and FIG. 2B is a bottom perspective view of the backlight unit.

As shown in FIGS. 2A and 2B, the backlight unit includes at least one light source module 10, an optical member 40, a cover plate 50, a panel support 60, a bottom cover ) 70, a first reflector 80, and a second reflector 82. The first reflector 80 and the second reflector 82 may be formed of a transparent material.

At least one light source module 10 is disposed between the first reflector 80 and the second reflector 82. According to the embodiment, at least one light source module 10 is disposed extending along the edge portion of the bottom cover 70 in the first direction.

The light source module 10 may be disposed adjacent to the first reflector 80 or the second reflector 82. [ Optionally, the light source module 10 may be spaced apart from the second reflector 82 at the same time as it contacts the first reflector 80, or may be disposed at a distance from the first reflector 82 80, respectively. Alternatively, the light source module 10 may be spaced apart from the first reflector 80 and the second reflector 82, or may be simultaneously in contact with the first reflector 80 and the second reflector 82 .

The light source module 10 may include a circuit board having an electrode pattern and a light emitting device for generating light. At this time, at least one light emitting element may be mounted on the circuit board, and an electrode pattern for connecting the adapter supplying power and the light emitting element 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 a printed circuit board (PCB) on which a plurality of light sources 10 are mounted, such as polyethylene terephthalate (PET), glass, polycarbonate (PC) And may be formed in a film form. In addition, the circuit board may be a single layer PCB, a multilayer PCB, a ceramic substrate, a metal core PCB, or the like.

The light emitting diode may be a blue LED chip or an ultraviolet LED chip or a red LED chip, a green LED chip, a blue LED chip, a yellow green LED, Chip, white LED chip, or the like.

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).

Further, 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 exit surface is disposed so as to face the air guide between the optical member 40 and the second reflector 82 The light source module 10 may be of a indirect emission type structure in which the light exit surface is disposed to face either the first reflector 80, the second reflector 82, or the cover plate 50 direction. Here, in the indirect emission type light source module 10, the emitted light is reflected by the first reflector 80, the second reflector 82 and the cover plate 50, and the reflected light is reflected again in the air guide direction of the backlight unit You can move on. The reason why the light source module 10 is disposed in the indirect emission structure is because it can reduce the hot spot phenomenon.

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

Here, the first reflector 80 has an open area, and may be disposed on one side of the light source module 10 or spaced apart at regular intervals. That is, the first reflector 80 may be arranged such that a central region thereof is opened, and the light source module 10 faces the opposite side 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 so as to reflect the light generated from the light source module 10 toward the second reflector 82.

In addition, a sawtooth-shaped reflection pattern may be formed on the surface of the first reflector 80 facing the light source module 10, and the surface of the reflection pattern may be flat or curved.

The reason for forming the reflection pattern on the surface of the first reflector 80 is to reflect the light generated by the light source module 10 to the central region of the second reflector 82 so as to increase the brightness in the central region of the backlight unit to be.

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

The inclined surface of the second reflector 82 may 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 .

Further, 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 area of the second reflector 82 may be a flat plane, a convex curved surface, or a concave curved surface, or may include a plurality of shapes.

Optionally, the light source module 10 may be spaced a first distance from the first reflector 80 and a second distance from the second reflector 82. Here, the second distance may be larger or smaller than the first distance. The reason is that the light generated by the light emitting module 10 is concentrated in the central region of the second reflector 82 to increase the brightness in the central region of the backlight unit.

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

The second reflector 82 may have a structure in which a reflective film is attached to a mold body having an inclined surface, a structure in which a reflective film having an inclined surface is attached to a mold body having a plane, Or may be a mold body itself having a reflecting surface.

Here, the reflective film may include at least one of a metal or a metal oxide, and may be 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 80 and the second reflector 82 may be different from each other. That is, the first reflector 80 may have a regular reflection surface that regularly reflects light, and the second reflector 82 may have a diffusely reflective surface that irregularly reflects light. Alternatively, the first reflector 80 may have a diffuse reflection surface to diffuse light, and the second reflector 82 may have a regular reflection surface regularly reflecting the light.

In some cases, the second reflector 82 may be provided with a regular reflection surface in an area adjacent to the light source module 10, and a diffusive reflection surface in an area distant from the light source module 10.

On the other hand, the optical member 40 is supported by the first reflector 80 and can be arranged to face the second reflector 82. [ Here, the optical member 40 is formed 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. At least one of the upper surface and the lower surface of the optical member 40 may have a concavo-convex shape for uniform diffusion of light.

Next, the cover plate 50 can be brought into contact with the first reflector 80 and the second reflector 82 and fixed to each other. Here, the cover plate 50 may be made of a material different from the bottom cover 70 including the second reflector 82. That is, the cover plate 50 may be made of metal.

The panel support portion 60 covers a part of the cover plate 50 and can be fixedly disposed on the cover plate 50. [

The bottom cover 70, on which the second reflector 82 is formed on the inner surface thereof, can be made of a polymer resin such as plastic to enable injection molding.

FIG. 3A is a perspective view of the bottom cover 70 according to the embodiment, and FIG. 3B is a plan view schematically showing a combined plan view of the bottom cover 70 and at least one light source module 10 and 12 according to the embodiment.

3A, the bottom cover 70 is disposed below the first reflector 80 and has a protrusion 72 on the side wall (or sidewall) 76. In addition, the bottom cover 70 further has at least one edge portion 74. The edge portion 74 of the bottom cover 70 extends in the first direction. As described above, at least one light source module 10 and 20 extend in a first direction along the edge portion 74 and are disposed between the first and second reflectors 80 and 82.

The protrusion 72 of the bottom cover 70 extends from the tip portion 78 of the edge portion 74 in a second direction different from the first direction and protrudes further than the tip portion 78. According to the embodiment, the protrusion 72 can protrude with a width w of the order of 1 to 5 mm.

As such, by forming the protrusion 72 on the bottom cover 70, the arm portions A and B as shown in Fig. 1 can be improved.

5 is a cross-sectional view of the bottom cover 70 and the light source modules 10 and 20 shown in FIG. 3B, taken along line 5-5 ' Fig. Although the cover plate 50 is not shown in FIG. 3B, for ease of understanding, the cover plate 50 is shown in FIG.

Referring to FIG. 4, the bottom cover 70 according to the embodiment has a protrusion 72 locally protruding from a portion of the side wall 76.

5, light source modules 10 and 20 are formed on a cover plate 50. The light source module 10 includes a circuit board 12 and a light source 14, And includes a circuit board (22) and a light source (24).

The first reflector 80 may reflect the light generated from the light source modules 10 and 20 toward the second reflector 82. The bottom cover 70 includes at least two inclined surfaces having at least one inflection point, and the curvatures of the first and second inclined surfaces adjacent to each other around the inflection point may be made different from each other.

In the bottom cover 70 according to the embodiment shown in Figs. 3A and 3B described above, the protrusion 72 takes a hemispherical shape. However, the protrusion 72 according to the embodiment may have various forms as follows.

6A to 6D show various plan views of the protrusion 72 formed in the bottom cover 70 according to the embodiment.

The protrusion 172 shown in Fig. 6A protrudes in a rectangular shape on a part of the side wall 76. The protrusion 272 shown in Fig. 6B protrudes in a triangular shape on a part of the side wall 76, Projecting in a trapezoidal fashion at a portion of the sidewall 76. In addition, the protrusion 372 may protrude in the form of polygons of various shapes.

As shown in Figs. 3A and 3B and Figs. 6A to 6C, the protrusions 72, 172, 272, and 372 protrude from the bottom portion 70 of the bottom cover 70 at portions 73 where a plurality of slopes contact each other It is possible. However, the protrusions 72, 172, 272, and 372 may protrude from the central portion of the side wall 76, not the portion 73 that abuts against each other.

The protrusions 72, 172, 272 and 372 of the bottom cover 70 shown in Figs. 3A, 3B and 6A to 6C are locally protruded at a portion of the side wall 76. However, this embodiment is not limited to this. 6D, the protrusion 472 may protrude over the entire length of the side wall 76. In other words, In this case, the projecting portion 472 may protrude over the entire length of the side wall 76 in the form of a square, a triangle or a trapezoid, as shown in Figs. 6A to 6C.

The protruding width w of the protrusions 72, 272, 372 and 472 as shown in Figs. 3A, 3B and 6B to 6D is smaller than the protrusion width w of the bottom cover 70 It can be gradually reduced along two directions. This is because the edge portions 74 of the bottom cover 70 are provided with the light source modules 10 and 20 so that the dark portions A and B shown in FIG. 1 are reduced toward the edge portion 74.

Alternatively, the protrusions 172 may protrude uniformly along the second direction as shown in FIG. 6A.

On the other hand, the backlight unit may further include a top cover covering the panel support 60 at the edge of its top.

Figs. 7A to 8F show partial cross-sectional views of the bottom cover 70 shown in Fig. 3B in the 4-4 'direction. Although the top cover 90 is not shown in FIG. 3B, for ease of understanding, the top cover 90 is shown in FIGS. 7A-8F.

7A to 7D, the protrusions protrude into the bottom cover 70 in an area 77 covered by the top cover 90. As shown in Figs. The protrusions may also have different shapes (or widths) at the observable depth d (or above the observable depth) and below the observable depth d (i.e., at a depth deeper than the observable depth) And can be variously protruded. Here, the observable depth (d) is defined as the depth observable by the viewer.

According to the embodiment, as shown in Fig. 7A, the projections can protrude in both convex shapes above and below the observable depth d.

Alternatively, as shown in Fig. 7B, at the observable depth d, the protrusions protrude in a convex form, but can be uniformly protruded deeper than the observable depth d.

Alternatively, as shown in Fig. 7C, at the observable depth d, the protrusions project in a concave shape, but can be uniformly protruded deeper than the observable depth d.

Alternatively, as shown in Fig. 7D, the protrusions can protrude to a uniform extent at an observable depth d or deeper than the observable depth d.

According to the embodiment, the protrusions protrude only from the observable depth d to the portion 77 covered by the top cover 90 and are covered by the top cover 90 at a depth deeper than the observable depth d Portion 77, as shown in Fig.

In this case, the protruding portion is projected to the observable depth (d) to a convex, concave, or uniform degree, and the protruding portion can be projected to a convex, concave or uniform degree at a depth deeper than the observable depth (d).

8A, the protrusions protrude up to the portion 77 covered by the top cover 90 at the observable depth d, and the protrusion is deeper than the observable depth d Where the protrusions can protrude concavely.

Alternatively, as shown in Fig. 8B, the protrusions may protrude concave both at the observable depth d and at a depth deeper than the observable depth d.

Alternatively, as shown in Fig. 8C, the protrusions may protrude convexly both at the observable depth d and at a depth deeper than the observable depth d.

Alternatively, as shown in Fig. 8D, the projecting portion is projected concavely from the observable depth d to the portion 77 covered by the top cover 90, and convex at a position deeper than the observable depth d, As shown in Fig.

Alternatively, as shown in FIG. 8E, the projecting portion is uniformly projected from the observable depth d to the portion 77 covered by the top cover 90, and concave at a depth deeper than the observable depth d As shown in Fig.

Alternatively, as shown in Fig. 8F, the protrusions uniformly protrude from the observable depth d to the portion 77 covered by the top cover 90, and at a position deeper than the observable depth d, Can be convexly protruded.

As described above, in the embodiments, the protruding portions 72, 172, 272, 372, and 472 are provided in the arm portions A and B as shown in FIG. 1 to originally reduce the arm portions A and B, Uniform brightness can be provided.

Meanwhile, as shown in FIG. 2B, the bottom cover 70 may be provided with a plurality of reinforcing ribs 71 on the lower surface thereof. The reason for this is that the second reflector 82 is a reflecting surface having a curved surface, so that the second reflector 82 can be deformed by external environmental conditions, and therefore, a reinforcing rib 71 may be provided to prevent this. The reinforcing ribs 71 may be disposed not only on the rear surface facing the inclined surface of the second reflector 82 but also on the rear surface facing the side surface of the second reflector 82. [

Fig. 9 shows a perspective view of the bottom cover 70 having the support pin 79. Fig.

9, the bottom cover 70 may further include support pins 79 for supporting the optical member 40 on the upper surface of the second reflector 82. [ Since the optical member 40 is separated from the second reflector 82 and an air guide is formed therebetween, the support pin 79 is formed because the central region of the optical member 40 can be downwardly deformed. For this purpose, it may be stable that the area of the lower surface of the support pin 79 contacting the second reflector 82 is larger than the area of the upper surface.

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

As shown in FIG. 10, the display module 100 may include a display panel 110 and a backlight unit 120.

The display panel 110 includes a color filter substrate 112 and a TFT (Thin Film Transistor) substrate 114 that are bonded together to maintain a uniform cell gap, and the two substrates 112 and 114 A liquid crystal layer (not shown) may be interposed.

The upper polarizer 116 and the lower polarizer 118 may be disposed on the upper and lower sides of the display panel 110 and more specifically the upper polarizer 116 may be disposed on the upper surface of the color filter substrate 112 And the lower polarizer 118 may be disposed on the lower surface of the TFT substrate 114.

Although not shown, a gate and a data driver for generating a driving signal for driving the panel 110 may be provided on a side surface of the display panel 110.

11 and 12 are views showing a display device according to an embodiment.

11, the display device 1 includes a display module 100, a front cover 130 surrounding the display module 100, a back cover 140, a driving unit 150 provided in the back cover 140, And a driving unit cover 160 that surrounds the driving unit 150.

The front cover 130 may include a transparent front panel (not shown) for transmitting light. The front panel may protect the display module 100 at regular intervals, and may include light emitted from the display module 100 So that an image displayed on the display module 100 is displayed from the outside.

The back cover 140 may be coupled with the front cover 130 to protect the display module 100.

The driving unit 150 may be disposed on one side of the back cover 140.

The driving unit 150 may include a driving control unit 152, a main board 154, and a power supply unit 156.

The driving controller 152 may be a timing controller and is a driving unit for adjusting the operation timing of each driver IC of the display module 100. The main board 154 may include a V-sync, H-sync, and R, G, And a power supply unit 156 is a driving unit for applying power to the display module 100. [

The driving unit 150 may be provided on the back cover 140 and may be enclosed by the driving unit cover 160.

The back cover 140 may include a plurality of holes to connect the display module 100 and the driving unit 150 and a stand 170 for supporting the display device 1.

12, the driving control unit 152 of the driving unit 150 is provided in the back cover 140, and the main board 154 and the power board 156 may be provided in the stand 170 have.

The driving unit cover 160 may cover only the driving unit 150 provided on the back cover 140.

Although the main board 154 and the power board 156 are separately formed in the embodiment, they may be formed as one integrated board, but the present invention is not limited thereto.

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.

1: display device 10, 20: light source module
30: bottom cover 32, 82: second reflector
40: optical member 50: cover plate
60: panel support 70: bottom cover
71: reinforcing ribs 72, 172, 272, 372, 472:
74: edge portion 76: side wall
78: tip portion 79: support pin
80: first reflector 90: top cover
100: display module 112, 114: substrate
116: upper polarizer 118: lower polarizer
120: backlight unit 130: front cover
140: back cover 150:
160: driving unit cover 152:
154: main board 156: power supply unit
170: Stand

Claims (16)

A first reflector;
A bottom cover disposed under the first reflector and having a projection on a side wall portion;
A second reflector formed on an inner surface of the bottom cover; And
And at least one light source module disposed between the first reflector and the second reflector,
Wherein the protrusions protrude in different shapes above and below the observable depth. The apparatus of claim 1, wherein the bottom cover further comprises at least one edge portion extending in a first direction,
Wherein the projecting portion extends from a leading end portion of the edge portion in a second direction different from the first direction, and protrudes further than the leading end portion. The backlight unit according to claim 2, wherein the at least one light source module extends in the first direction along the edge portion. The backlight unit according to claim 2, wherein the projecting portion projects locally at a portion of the side wall portion. The backlight unit according to claim 4, wherein a part of the side wall part is a central part of the side wall part. The backlight unit according to claim 2, wherein the projecting portion protrudes over an entire length of the side wall portion. The backlight unit according to claim 2, wherein the protrusion gradually protrudes from the edge portion. The backlight unit according to claim 2, wherein the protrusions are uniformly protruded along the second direction. 3. The backlight unit according to claim 2, wherein the projecting portion locally protrudes from a bottom surface of the bottom cover at a portion where a plurality of inclined surfaces contact each other. The backlight unit according to claim 1, wherein the protruding portion protrudes in at least one of hemispherical shape, triangular shape, rectangular shape, trapezoid shape, and polygonal shape. 2. The backlight unit according to claim 1, further comprising a top cover covering an edge of the tower of the backlight unit,
And the protruding portion protrudes to a portion covered by the top cover. delete 2. The backlight unit of claim 1, further comprising a top cover covering an edge of the tower of the backlight unit,
Wherein the projection is projected to a portion covered by the top cover at an observable depth and wherein the projection below the observable depth protrudes more than a portion covered by the top cover. 2. The backlight unit of claim 1, wherein the protrusions are convex, concave, or even protruded above the observable depth, and the protrusions are convex, concave, or uniformly protruded below the observable depth. The backlight unit according to claim 1, wherein a protruding width of the protrusion is 1 to 5 mm or less. A display panel;
And a backlight unit for emitting light to the display panel,
Wherein the backlight unit is any one of the backlight units according to any one of claims 1 to 11 and 13 to 15.

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