KR20190100900A - Backlight unit and display apparatus having the same - Google Patents

Abstract

According to a backlight unit and a display device having the same, the backlight unit comprises: a light source generating light; and a light guide plate adjacent to the light source. The light guide plate has: a light incident surface receiving the light; a light emission surface emitting the light incident through the light incident surface; a reflection surface facing the light emission surface and reflecting the incident light; and a protrusion unit provided with a lenticular shape on the light emission surface. The reflection surface has a slope surface which is adjacent to the light incident surface and sloped toward a light emission surface side. Therefore, a whole thickness of the display device can be reduced and light efficiency of the backlight unit can be increased.

Description

BACKLIGHT UNIT AND DISPLAY APPARATUS HAVING THE SAME}

The present invention relates to a backlight unit and a display device having the same, and more particularly, to a backlight unit and a display device having the same that can reduce the overall thickness.

In general, a flat panel display device includes a display panel for displaying an image, a backlight unit for supplying light to the display panel, and a bottom chassis for accommodating the backlight unit.

The backlight unit is divided into an edge type and a direct type according to the position of the light source. Edge type has the advantage of having a thin thickness compared to the direct type. Therefore, the portable display device employs many edge type backlight units.

However, as users prefer a thin and light portable display device, efforts have been made to reduce the thickness of the display device while preventing the display quality from deteriorating.

An object of the present invention is to provide a backlight unit that can reduce the overall thickness.

Another object of the present invention is to provide a display device including the backlight unit.

The problem to be solved by the present invention is not limited to the above-mentioned problem, another task that is not mentioned will be clearly understood by those skilled in the art from the following description.

The backlight unit according to the exemplary embodiment includes a light source generating light and a light guide plate adjacent to the light source. The light guide plate may have an entrance surface for receiving the light, an exit surface for emitting light incident through the entrance surface, a reflection surface facing the exit surface and reflecting the incident light, and a lenticular shape on the exit surface. It has a projection provided by. Here, the reflective surface has an inclined surface adjacent to the incident surface and inclined toward the exit surface.

A display device according to an embodiment of the present invention includes a display unit displaying an image, a backlight unit providing light to the display unit, and a storage container accommodating the backlight unit.

The backlight unit includes a light source generating light and a light guide plate adjacent to the light source. The light guide plate may have an entrance surface for receiving the light, an exit surface for emitting light incident through the entrance surface, a reflection surface facing the exit surface and reflecting the incident light, and a lenticular shape on the exit surface. And a protruding portion provided with the inclined surface, the inclined surface adjacent to the incidence surface and inclined toward the exit surface side.

According to an exemplary embodiment of the present invention, the reflective surface of the light guide plate is formed to include an inclined surface adjacent to the incident surface and inclined toward the exit surface, thereby reducing the overall thickness of the display device while increasing the light incident area of the light guide plate.

In addition, a lenticular protrusion is formed on the exit surface of the light guide plate to suppress leakage of light incident on the light guide plate to the side surface of the light guide plate. Therefore, the light efficiency of the backlight unit can be improved.

In addition, the protrusion has a structure in which the height and diameter linearly increase as it moves away from the incident surface in the light incident region, thereby suppressing light leakage in the light incident region of the light guide plate.

1 is an exploded perspective view of a display device according to an exemplary embodiment.
FIG. 2 is a plan view of the light guide plate and the light emitting diode shown in FIG. 1.
3 is a cross-sectional view taken along the line II ′ of FIG. 2.
4 is a plan view of the protrusion.
FIG. 5 is a cross-sectional view of the protrusion cut along the cutting line II-II ′ and the cutting line III-III ′ shown in FIG. 4.
FIG. 6 is graphs illustrating luminance of each light guide plate according to the case where the protrusion having the same shape as the second lenti region is provided in the first lenti region.
7 is graphs illustrating luminance of each light guide plate according to a start point of the first lenti region.
8 is a graph illustrating luminance of each light guide plate according to the width of the first lenti region.
9 is a perspective view of the light guide plate illustrated in FIG. 1.
FIG. 10 is a cross-sectional view taken along the line IV-IV ′ of FIG. 9.
FIG. 11 is a cross-sectional view taken along the cutting line VV ′ of FIG. 9.
12 is a view showing the light receiving efficiency of light incident on the light guide plate when the protrusion is formed on the emission surface.
FIG. 13 is a diagram illustrating light incidence efficiency of light incident on a light guide plate when no protrusion is formed on an emission surface.
14 is a cross-sectional view showing the inclination angle of the inclined surface and the width of the region where the inclined surface is formed.
15 is a plan view of the light guide plate.
FIG. 16 is a graph showing an average luminance when cut along the cutting line BB ′ illustrated in FIG. 15.
17 is a graph showing the light incidence efficiency according to the inclination angle.
18 is a graph illustrating luminance and light incidence efficiency according to the width of a region where an inclined surface is formed.
19A and 19B are diagrams illustrating a light emission path according to the curvature of the protrusion.
20 is a plan view of the light guide plate.
FIG. 21 is a graph illustrating luminance at an imaginary line AA ′ of FIG. 20 according to curvature of the protrusion.
22 is a rear view illustrating the light guide plate and the light emitting diode.
FIG. 23 is a cross-sectional view taken along the line VI-VI ′ of FIG. 22.
24 is a cross-sectional view illustrating a reflector according to an exemplary embodiment of the present invention.
25 is a cross-sectional view illustrating a reflecting plate according to another exemplary embodiment of the present invention.
FIG. 26 is a graph illustrating luminance of a light incident region according to a shape of a reflector.
27 is a cross-sectional view illustrating a light guide plate and a reflecting plate according to another exemplary embodiment of the present invention.
FIG. 28 is a cross-sectional view taken along the cutting line VII-VII ′ of FIG. 1.
29 is a cross-sectional view of a display device according to another exemplary embodiment of the present invention.
30 is a plan view of a backlight unit according to another exemplary embodiment of the present invention.
FIG. 31 is a cross-sectional view taken along the line VII-VII` of FIG. 30.

Objects, other objects, features and advantages of the present invention will be readily understood through the following preferred embodiments associated with the accompanying drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided so that the disclosure may be made thorough and complete, and to fully convey the spirit of the present invention to those skilled in the art.

In the present specification, when it is mentioned that one component is on another component, it means that it may be formed directly on the other component or a third component may be interposed therebetween. In addition, in the drawings, the thickness of the components are exaggerated for the effective description of the technical content.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In this specification, the singular also includes the plural unless specifically stated otherwise in the phrase. As used herein, the words 'comprises' and / or 'comprising' do not exclude the presence or addition of one or more other components.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

1 is an exploded perspective view of a display device according to an exemplary embodiment.

Referring to FIG. 1, the display device 1000 includes a display unit 100, a backlight unit 200, a mold frame 400, and a bottom chassis 500.

When the display device 1000 is viewed in a plan view, the display device 1000 may have a rectangular structure. The short axis direction of the display device 1000 is defined as a first direction D1, and the long axis direction of the display device 1000 is defined as a second direction D2 orthogonal to the first direction D1. In addition, the bottom chassis 500, the backlight unit 200, the mold frame 400, and the display unit 100 of the display device 1000 may be perpendicular to the first and second directions D1 and D2. Laminated sequentially in three directions D3.

The display unit 100 includes a display panel 106 for displaying an image, a driving chip 108 for providing a driving signal to the display panel 106, and a printed circuit board electrically connected to the display panel 106. 110).

The display panel 106 may include a first substrate 102, a second substrate 104 coupled to face the first substrate 102, and between the first substrate 102 and the second substrate 104. And a liquid crystal layer (not shown) interposed therebetween. For example, although the display panel 106 is formed of a liquid crystal display panel in FIG. 1, the display panel 106 is not limited to the liquid crystal display panel.

A plurality of pixels are provided in a matrix form on the first substrate 102, and each of the plurality of pixels extends in a gate line (not shown) extending in the first direction D1 and in the second direction D2. A data line (not shown) and a pixel electrode (not shown) intersecting and insulated from the gate line are provided. In addition, each pixel is provided with a thin film transistor (not shown) and is connected to the gate line, the data line, and the pixel electrode.

In the second substrate 104, a red green blue (RGB) pixel (not shown), which is a color pixel, and a common electrode (not shown) facing the pixel electrode are formed. The color pixel and the common electrode may be provided on the first substrate 102. The liquid crystal layer may be arranged according to the size of the electric field formed between the pixel electrode and the common electrode, thereby controlling a transmittance of light provided from the backlight unit 200 to display a desired gray scale.

In plan view, at least one side of the first substrate 102 may be provided with the driving chip 108 for applying a data signal to the data line. The driving chip 108 generates a data signal to be applied to the data line of the display panel 106 in response to an external signal. The external signal is a signal supplied from the printed circuit board 110, and the external signal may include an image signal, various control signals, a driving voltage, and the like.

The first substrate 102 includes a gate driving circuit provided at a side different from the at least one side to apply a gate signal to the gate line. The gate driving circuit may be formed on the other side through a thin film process of forming the display panel 106. Thus, the gate driving circuit may be embedded in the display panel 106.

In another embodiment of the present invention, the driving chip 108 may be composed of two or more chips separated into a data driving chip and a gate driving chip, and the first substrate by a chip on glass process. And may be mounted on 102.

The printed circuit board 110 may be electrically connected to the display panel 106 by a plurality of tape carrier packages (TCPs) 109. The driving chip 108 may be mounted on the TCPs 109. The TCPs 109 may be bent to surround the side of the bottom chassis 500.

The printed circuit board 110 connected to the TCPs 109 is disposed under the bottom chassis 500. In this case, the display device 1000 may further include a shield case (not shown) disposed under the bottom chassis 500 to protect the printed circuit board 110. Although not shown in the drawing, the printed circuit board 110 may be disposed on sidewalls of the bottom chassis 500.

The backlight unit 200 may include a light guide plate 220 that generates light and a light guide plate 220 that receives the light from the light source 210 and guides the light to the display unit 100.

In one embodiment of the present invention, the backlight unit 200 may be an edge type backlight unit. That is, the light source unit 210 of the backlight unit 200 provides the light to at least one side surface of the light guide plate 220 under the display panel 106, and the light guide plate 220 provides the light. It guides to the said display unit 100 side.

The light guide plate 220 may include a first side surface 221 extending in the first direction D1 of the display device 1000, a second side surface 222 parallel to the first side surface 221, and the display. A third side 223 extending in the second direction D2 of the device 1000, and a fourth side 224 parallel to the third side 223. In one embodiment of the present invention, the light source unit 210 is provided adjacent to the third side surface 223 of the light guide plate 220. Therefore, hereinafter, the third side surface 223 is referred to as an incident surface of the light guide plate 220.

The light source unit 210 may include a plurality of light emitting diodes (LEDs) 211 sequentially arranged along the incident surface 223. The light source unit 210 may further include a support film 212 on which the plurality of light emitting diodes 211 are mounted. The plurality of light emitting diodes 211 may be spaced apart from each other in the second direction D2 on the support film 212.

The backlight unit 200 may include a plurality of optical sheets 230 disposed between the light guide plate 220 and the display unit 100 and a reflector 240 disposed under the light guide plate 220. It includes more.

The plurality of optical sheets 230 includes a diffusion sheet for diffusing light and at least one light condensing sheet for condensing light, thereby improving brightness and viewing angle of light emitted to the emission surface. Although not shown in the drawing, the plurality of optical sheets 230 may further include a protective sheet provided on the top of the sheets. The reflecting plate 240 is provided below the light guide plate 220 to reflect light leaked from the light guide plate 220 and to re-inject the light back to the light guide plate 220.

The bottom chassis 500 may include a bottom part 502 on which the backlight unit 200 is seated, a side wall 504 extending from the bottom part 502 in a vertical direction (ie, the third direction D3), And a cover part 506 extending from the side wall 504 in parallel with the bottom part 502 to cover the light source part 210.

The mold frame 400 is interposed between the display unit 100 and the backlight unit 200 to support the display panel 106. The mold frame 400 includes a support part 410 for supporting the display panel 106 and sidewalls 420 extending in the third direction D3 from the support part 410. The mold frame 400 may partially expose the support part 410 and the sidewall 420 adjacent to the light source part 210 to expose the cover part 506 of the bottom chassis 500. Accordingly, the display panel 106 may be mounted on the cover 506 in an area adjacent to the light source 210 (hereinafter, referred to as a light incident area).

Double-sided tape (not shown) may be interposed between the display panel 106 and the cover unit 506. Thus, the display panel 106 may be fixed to the cover part 506 by the double-sided tape.

In addition, a fixing tape (not shown) for fixing the display panel 106 to the mold frame 400 may be further attached to an edge of the display panel 106.

Although not shown in the drawing, in another embodiment, the display apparatus 1000 may be coupled to face the bottom chassis 500 in place of the fixing tape, and the top chassis may cover an edge of the display panel 106. It may further include.

FIG. 2 is a plan view of the light guide plate and the light emitting diode shown in FIG. 1, and FIG. 3 is a cross-sectional view taken along the line II ′ of FIG. 2.

2 and 3, the light guide plate 220 is parallel to the first side surface 221 and the first side surface 221 extending in the first direction D1 of the display device 1000. The second side surface 222, the third side surface 223 extending in the second direction D2 of the display device 1000, and the fourth side surface 224 parallel to the third side surface 223 are disposed. Include.

For example, the plurality of light emitting diodes 211 may be arranged adjacent to the third side surface (ie, incident surface) 223. The light emitting diodes 211 generates light, and the light guide plate 220 receives the light through the third side surface 223. That is, the third side surface 223 is defined as an incident surface of the light guide plate 220, and the fourth side surface 224 parallel to the third side surface 223 is defined as a light facing surface facing the incident surface. Can be.

The light guide plate 220 further includes an emission surface 225 that emits light incident through the entrance surface 223, and a reflection surface 226 that faces the emission surface 225 and reflects the incident light. Include.

The reflective surface 226 is a first flat surface 226a parallel to the exit surface 225, an inclined surface 226b adjacent to the incident surface 223, and inclined toward the exit surface 225, and the inclined surface ( 226b and a second flat surface 226c connecting the incident surface 223. The inclined surface 226b is inclined in a direction away from the exit surface 225 toward the incident surface 223. The second flat surface 226c is provided in parallel with the exit surface 225 between the inclined surface 226b and the incident surface 223.

An angle (hereinafter, inclined angle) α in which the inclined surface 226b is inclined with respect to the second flat surface 226c may be 2 ° to 5 °. As the inclination angle α of the inclined surface 226b increases, light leakage in the light guide plate region (hereinafter, referred to as a light incident region) adjacent to the light source unit 210 may increase. Therefore, the angle of inclination of the inclined surface 226b may be set to 2 ° to 5 ° to suppress the increase in light leakage.

The light guide plate 220 further includes a protrusion 227 provided in a lenticular shape on the emission surface 225.

For example, the emission surface 225 may be divided into first and second regions A1 and A2 sequentially adjacent to the incident surface 223. In this case, the protrusion 227 is not formed in the first area A1 but is provided only in the second area A2. In an embodiment, the second region A2 includes a first lenti area RA1 and a second lenti area RA2.

The protrusion 227 has a semiconical shape extending in a direction D1 perpendicular to the length direction D2 of the third side surface 223 in the first lenti area RA1, and a second lenti area RA2. The protrusion 227 has a semi-cylindrical shape extending in a direction D1 perpendicular to the longitudinal direction D2 of the incident surface 223. In detail, the height of the protrusion 227 increases in the first lentid area RA1 as the distance from the incident surface 223 increases, and the diameter of the protrusion 227 also increases in the distance from the incident surface 223. Increases.

4 is a plan view of the protrusion, and FIG. 5 is a cross-sectional view of the protrusion cut along the cutting line II-II ′ and the cutting line III-III ′ of FIG. 4.

4 and 5, the protrusion 227 has a semicircular shape when cut in the longitudinal direction D2 of the incident surface 223. When the height of the protrusion 227 is defined as 'h' and the diameter is defined as 'd', the height h and the diameter d of the protrusion 227 in the first lenti area RA1 are linear. Increase by enemy. The ratio of the height h and the diameter d of the protrusion 227 is the same, so that the radius of curvature of the protrusion 227 in the first lenti area RA1 is constant.

Meanwhile, in the second lenti region RA2, the protrusion 227 has a constant height h and a constant diameter d. For example, the protrusion 227 may have the same radius of curvature in the first and second lenti regions RA1 and RA2.

However, in another embodiment of the present invention, the protrusion 227 may have a semi-conical shape in the second lenti area RA2. That is, the height h and the diameter d of the protrusion 227 may increase as the distance from the incident surface 223 also increases in the second lenti area RA2.

FIG. 6 are graphs illustrating luminance of each light guide plate according to the position of the protrusion having the same shape as that of the second lenti region in the first lenti region. In FIG. 6, the x axis represents the position of the light guide plate and the y axis represents the luminance. 6, the first graph G1 represents luminance when the height h of the protrusion 227 is 7 μm and the diameter d is 100 μm, and the second graph G2 represents the protrusion ( The height h of the 227 is 8 μm and the diameter d is 100 μm. The third graph G3 shows the height h of the protrusion 227 of 10 μm and the diameter d. ) Is 100 μm, and the fourth graph G4 shows the brightness when the height h of the protrusion 227 is 10 μm and the diameter d is 50 μm.

Referring to FIG. 6, when the protrusion 227 having the same shape as that of the second lenti area RA2 is also provided in the first lenti area RA1, the luminance of the light guide plate 220 rapidly increases. It can be seen that the light leakage phenomenon appears.

In particular, as the height h of the protrusion 227 increases at the same diameter (ie, 100 μm) d, the luminance of the light incident region is higher. In addition, the smaller the diameter (d) of the protrusion 227 at the same height (that is, 10㎛), the higher the luminance of the light incident region. As a result, it can be seen that the light leakage phenomenon is more prominent as the curvature of the protrusion 227 is larger.

7 is graphs illustrating luminance of each light guide plate according to a start point of the first lenti region. In FIG. 7, the x axis represents the position of the light guide plate 220 and the y axis represents the luminance. In addition, in FIG. 7, the fifth graph G5 represents the luminance of the first case where the first lenti area RA1 is defined as a position range of 0 mm to 50 mm of the light guide plate 220, and the sixth graph G6. ) Represents luminance in a second case in which the first lenti area RA1 is defined as a position range of 3.5 mm to 50 mm of the light guide plate 220, and a seventh graph G7 represents the first lenti area RA1. The luminance in the third case defined by the position range of 2.5 mm to 50 mm of the light guide plate 220 is shown.

Referring to FIG. 7, in the first case, the first lenti area RA1 starts from a point where the emission surface 225 is in contact with the incident surface 223 of the light guide plate 220. However, in the second and third cases, the first lenti area RA1 starts at positions spaced 3.5 and 2.5 mm apart from the incident surface 223, respectively.

As shown in the fifth to seventh graphs G5 to G7, the luminance in the light incident region is higher in the first case than in the second and third cases. That is, when the first lenti area RA1 starts from the point of contact with the incident surface 223, light leakage occurs.

Accordingly, light leakage may be suppressed by providing the first region A1 (not shown in FIG. 2) in which the protrusion 227 is not formed between the first lenti region RA1 and the incident surface 223. have.

8 is a graph illustrating luminance of each light guide plate according to the width of the first lenti region. In FIG. 8, the x axis represents the position of the light guide plate 220 and the y axis represents the luminance. 8, the eighth graph G8 represents the luminance in the fourth case in which the first lenti area RA1 is provided at a position range of 2.5 mm to 10 mm of the light guide plate 220, and a ninth graph G9. ) Denotes a luminance in the fifth case where the first lenti area RA1 is provided at a position range of 3.5 mm to 50 mm of the light guide plate 220, and the tenth graph G10 is used to represent the first lenti area RA1. The brightness in the sixth case provided in the position range of 5 mm to 25 mm of the light guide plate 220 is shown.

Referring to FIG. 8, in the fourth case, the first lenti area RA1 has a width of 7.5 mm, and in the second case, the first lenti area RA1 has a width of 46.5 mm and a third width. In this case, the first lenti region RA1 has a width of 20 mm. Here, the width of the first lenti area RA1 represents a width in a direction perpendicular to the longitudinal direction of the incident surface 223.

As the width of the first lenient region RA1 is smaller, the inclination of the protrusion 227 formed in the first lenient region RA1 is increased. That is, when the width of the first lenti area RA1 is as narrow as 7.5 mm as in the fourth case, the inclination of the protrusion 227 may be in order for the protrusion 227 to reach a desired height within a width of 7.5 mm. Hurry up. However, when the width of the first lenti area RA1 is 46.5 mm wide as in the fifth case, the inclination of the protrusion 227 becomes smooth.

As shown in the eighth to tenth graphs G8 to G10, in the fourth case in which the width of the first lentid area RA1 is narrow to 7.5 mm, the luminance is increased in the light incident area, resulting in a light leakage phenomenon. .

Referring back to FIG. 3, when the width of the first lenti area RA1 is defined as 'a' and the maximum height of the protrusion 227 is defined as 'b' in the first lenti area RA1. A and b satisfy the following equation. Here, the width a of the first lenti area RA1 represents a width in a direction D1 perpendicular to the length direction D2 of the incident surface 223.

Equation

As discussed above, in order to suppress light leakage, the protrusion 227 should have a gentle inclination. To this end, for example, the protrusion 227 may be formed such that θ has a value smaller than 0.03 °.

FIG. 9 is a perspective view of the light guide plate illustrated in FIG. 1, and FIG. 10 is a cross-sectional view taken along the line IV-IV ′ of FIG. 9, and FIG. 11 is a line along the line V-V ′ of FIG. 9. It is a cut section.

9 and 10, the light guide plate 220 is provided with a protrusion 227 in a lenticular shape on the exit surface 225. Here, the lenticular shape refers to a semi-circular lens shape. However, the lenticular shape is not limited to the semi-circular lens shape, but may include a semi-elliptic shape or the like.

The emission surface 225 is divided into first and second regions A1 and A2 which are sequentially adjacent to the incident surface 223. In this case, the protrusion 227 is not formed in the first area A1 but is provided only in the second area A2. In an embodiment, the second region A2 includes a first lenti area RA1 and a second lenti area RA2.

The protrusion 227 has a semiconical shape extending in a direction D1 perpendicular to the length direction D2 of the incident surface 223 in the first lenti area RA1, and a second lenti area RA2. The protrusion 227 has a semicircular column shape extending in a direction D1 perpendicular to the length direction D2 of the incident surface 223. In detail, the height of the protrusion 227 increases in the first lentid area RA1 as the distance from the incident surface 223 increases, and the diameter of the protrusion 227 also increases in the distance from the incident surface 223. Increases.

As shown in FIG. 10, when the light guide plate 220 is cut in the length direction D2 of the incident surface 223 in the first lenti area RA1, the cross section of the protrusion 227 is semicircular. Has

As shown in FIG. 11, when the light guide plate 220 is cut in the length direction D2 of the incident surface 223 in the second lenti area RA2, the cross section of the protrusion 227 is semicircular. Has The height h and the diameter d of the protrusion 227 in the second lenti region RA2 are the height h and the diameter d of the protrusion 227 in the first lenti region RA1. Greater than)

In particular, the protrusion 227 is continuously arranged in the length direction D2 of the incident surface 223 in the second lenti area RA2. However, since the protrusion 227 has a smaller diameter than the protrusion 227 in the second lenti area RA2 in the first lenti region RA1, the protrusion in the first lenti region RA1. There may be a flat surface (ie, exit surface) 225 around 227.

FIG. 12 is a view illustrating light incidence efficiency of light incident on the light guide plate when the protrusion is formed on the emission surface, and FIG. 13 is a view illustrating light incidence efficiency of light incident on the light guide plate when the protrusion is not formed on the emission surface. Here, the light incidence efficiency indicates a ratio of light emitted through the light facing surface 224 to light incident through the incident surface 223.

Referring to FIG. 12, a plurality of light emitting diodes 211 are arranged along the length direction of the incident surface 223 on the incident surface 223 side of the light guide plate 220. When the protrusion 227 is formed on the emission surface 225, a light emission path is turned on by turning on light emitting diodes (eg, three light emitting diodes located in the center) of some of the light emitting diodes 211. Photographed.

Referring to FIG. 13, as shown in FIG. 12, three light emitting diodes positioned at the center of the plurality of light emitting diodes 211 arranged on the incident surface 223 side of the light guide plate 220 are turned on to emit light. Photographed. However, the protrusion 227 is not formed on the emission surface 225 of the light guide plate 220 illustrated in FIG. 13.

12 and 13, when the protrusion 227 is formed, the amount of light traveling to the first and second side surfaces 221 and 222 of the light guide plate 220 is not formed by the protrusion 227. You can see less. Meanwhile, the amount of light traveling toward the light facing surface (ie, the fourth side surface) 224 facing the incident surface 223 is further increased in the structure in which the protrusion 227 is formed. That is, when the protrusion 227 is formed, the light incident efficiency of the light guide plate 220 is increased.

In addition, when the protrusion 227 is formed on the emission surface 225, the amount of light leakage to the first and second side surfaces 221 and 222 may be reduced, and the emission of the light guide plate 220 may be reduced. The amount of light emitted through face 225 may be increased.

Protrusion (Y) Protrusion (no) Light incident surface (third side) 100% 100% First and second side 3.1% 13.7% Front (emission surface) 87.24% 76.9%

As shown in Table 1, when the amount of light incident through the incident surface 223 is 100%, leakage occurs through the first and second side surfaces 221 and 222 when the protrusion 227 is present. The amount of light to be made is only 3.1%, but without the protrusion 227, about 4 times as large as 13.7%. On the other hand, the amount of light emitted through the front surface (ie, the emission surface) 225 is increased by 87.24% when the protrusion 227 is present and about 10% compared to the case where the protrusion 227 is not present. When the protrusion 227 is formed on the emission surface 225, the front luminance of the light guide plate 220 may be increased to improve light efficiency of the backlight unit 200.

14 is a cross-sectional view showing the inclination angle of the inclined surface and the width of the region where the inclined surface is formed.

Referring to FIG. 14, the reflective surface 226 of the light guide plate 220 is adjacent to the first flat surface 226a and the incident surface 223 parallel to the emission surface 225 and the emission surface 225. The inclined surface 226b inclined to the side of the side) and the second flat surface 226c connecting the inclined surface 226b and the incident surface 223 to each other. The inclined surface 226b is inclined in a direction away from the exit surface 225 toward the incident surface 223.

The light guide plate 220 has a first thickness t1 at a position of the second flat surface 226c. That is, the first thickness t1 is equal to the separation distance t1 between the second flat surface 226c and the exit surface 225. The thickness of the light guide plate 220 gradually decreases at the position of the inclined surface 226b, and the thickness of the light guide plate 220 is kept constant at the position of the first flat surface 226a. That is, it has a second thickness t2 equal to the separation distance between the first flat surface 226a and the exit surface 225 at the position of the first flat surface 226a. As an example of the present invention, the first thickness t1 may be 0.54 mm, and the second thickness t2 may be 0.4 mm.

The inclined surface 226b connects the first flat surface 226a and the second flat surface 226c. When defining a triangle having the inclined surface 226b as the hypotenuse, the bottom side of the triangle may be defined as the width of an area where the inclined surface 226b is formed. As an example of the present invention, the width of the region where the inclined surface 226b is formed may have a value ranging from 1.3 mm to 2.5 mm. The height of the triangle may have a size corresponding to a difference between the first thickness t1 and the second thickness t2. In addition, even if the length of the hypotenuse in the present invention, the height of the triangle is constant.

In this case, as the inclination angle of the inclined surface 226b decreases in the order of the first angle α1, the second angle α2, and the third angle α3, the inclination of the inclined surface 226b becomes gentle. Here, the inclination angle is defined as the angle between the base side and the hypotenuse of the triangle. Since the height of the triangle is constant, the length of the base of the triangle decreases as the inclination angle increases. That is, the width of the area where the inclined surface 226b is formed decreases as the inclination angle increases.

When the width of the area where the inclined surface 226b is formed decreases to 1.0 mm or less, light leakage in the light incident area increases. This means that the light leakage increases when the inclination of the inclined surface 226b is sharp, so that the inclination angle of the inclined surface 226b may be 2 ° to 5 °.

FIG. 15 is a plan view of the light guide plate, and FIG. 16 is a graph illustrating average luminance when the light is cut along the cutting line B-B ′ of FIG. 15. 17 is a graph showing light incidence efficiency according to an inclination angle, and FIG. 18 is a graph showing brightness and light incidence efficiency according to a width of an inclined portion.

15 and 16, the cutting line BB ′ is a portion in which the light guide plate 220 is cut from the incident surface 223 toward the light facing surface 224, and the light guide plate 220 is based on the imaginary line A. Referring to FIGS. The emission surface 225 of is divided into an effective light emitting area AE and an ineffective light emitting area NAE. That is, the area from the incident surface 223 to the virtual line A is defined as the ineffective light emitting area NAE, and the area from the virtual line A to the large light surface 224 is the effective light emitting area AE. Is defined as

16 is a graph showing an average luminance from the point B 'to the virtual line A in the effective light emission area. In FIG. 16, the eleventh graph G11 represents the average luminance when the width of the region on which the inclined surface 226b is formed is 1.0 mm, and the twelfth graph G12 is 1.3 mm in the width of the region on which the inclined surface 226b is formed. In this case, the average brightness is shown, and the thirteenth graph G13 represents the average brightness when the width of the area where the inclined surface 226b is formed is 1.6 mm, and the fourteenth graph G14 is the area of the area where the inclined surface 226b is formed. The average brightness when the width is 2.5 mm is shown.

As shown in FIG. 16, when the area width on which the inclined surface 226b is formed is 1.0 mm, the average brightness in the virtual line A is the highest. In particular, in the case where the width of the region where the inclined surface 226b is formed is 1.3 mm to 2.5 mm, the average brightness in the virtual line A has no big difference, but when the width of the region where the inclined surface 226b is formed is 1.0, The average brightness in the virtual line A was about 200 lux to 500 lux as high.

As shown in FIG. 17, the light incidence efficiency according to the inclination angle of the inclined surface 226b was about 1%. In addition, as illustrated in FIG. 18, the light incident efficiency according to the width of the region where the inclined surface 226b was formed also varied within about 1%. Therefore, the inclination angle of the inclined surface 226b and the width of the region in which the inclined surface 226b is formed are not significantly different in terms of light incidence efficiency.

However, as shown in FIGS. 16 and 18, when the width of the region in which the inclined surface 226b is formed decreases to 1.0 mm or less, the average luminance increases rapidly. In FIG. 18, the fifteenth graph G15 represents the light incidence efficiency according to the width of the region where the inclined surface 226b is formed, and the sixteenth graph G16 represents the luminance according to the width of the region in which the inclined surface 226b is formed.

In the present invention, in order to suppress the light leakage caused by the rapid increase in the average brightness, the width of the inclined surface 226b is formed to be 1.3mm or more so that the inclination of the inclined surface 226b is smooth, and the inclination angle ( α) can be formed from 2 ° to 5 °.

19A and 19B are diagrams illustrating a light emission path according to the curvature of the protrusion. However, the protrusion 227 of FIG. 19A has a first height h1 of 8 μm and a first diameter d1 of 160 μm, and the protrusion 227 of FIG. 19B has a second height h2 of 20 μm. It has a 2nd diameter d2 of 72.5 micrometers.

Referring to FIGS. 19A and 19B, as the curvature of the protrusion 227 increases, the light emitted from the light guide plate 220 does not diffuse toward the first and second side surfaces 221 and 222, and has straightness. Therefore, as the curvature of the protrusion 227 increases, the light efficiency of the light guide plate 220 may increase.

However, when the curvature of the protrusion 227 increases, light leakage in the light incident region of the light guide plate 220 may increase.

FIG. 20 is a plan view of the light guide plate, and FIG. 21 is a graph showing luminance at an imaginary line A-A 'of FIG. 20 according to curvature of the protrusion. In FIG. 21, the seventeenth graph G17 shows the luminance in the seventh case where the protrusion 227 has a height of 10 mu m and a diameter of 50 mu m, and the eighteenth graph G18 shows that the protrusion 227 has a 10 mu m thickness. The eighth case shows the luminance in the eighth case having a height and a diameter of 100 μm, and the nineteenth graph G19 shows the luminance of the ninth case in which the protrusion 227 has a height of 5 μm and a diameter of 100 μm.

20 and 21, when comparing the seventh and ninth cases where the height of the protrusion 227 is equal to 10 μm, the ninth case having a larger diameter is the imaginary line AA than the seventh case. At low position. In addition, when comparing the eighth and ninth cases where the diameter of the protrusion 227 is equal to 100 μm, the ninth case having a lower height is lower at the position of the virtual line A-A 'than the eighth case. Appeared.

As can be seen from this, as the curvature of the protrusion 227 increases, the luminance in the light incident region increases. Therefore, it is important to set the curvature of the protrusion 227 appropriately so that light leakage does not occur. As an example of the present invention, the protrusion 227 may be designed to have a height of 8 μm or less and a diameter of 100 μm or more so that the luminance in the light incident area is reduced to 1500 lux or less.

FIG. 22 is a rear view illustrating the light guide plate and the light emitting diode, and FIG. 23 is a cross-sectional view taken along the cutting line VI-VI ′ of FIG. 22.

22 and 23, a reflective pattern 226d is formed on the reflective surface 226 of the light guide plate 220. The reflective pattern 226d serves to reflect the light received through the incident surface 223 of the light guide plate 220 and provide it to the exit surface 225.

However, when the lenticular protrusion 227 is formed on the emission surface 225 and the inclined surface 226d is formed on the reflective surface 226, the effective light emission area AE of the light guide plate 220 is formed. Among the two light emitting diodes 211 adjacent to each other, a hot spot phenomenon may occur in which the luminance of the corresponding region is relatively bright. Therefore, as an example of the present invention, the density of the reflective pattern 226d may be adjusted so that the hot spot phenomenon is not recognized.

As an example, the reflective pattern 226d is formed on the reflective surface 226 corresponding to the effective light emission area AE of the light guide plate 220.

In the effective light emitting area AE, when the light source having a relatively high luminance is defined as the 'C1' region between the two light emitting diodes 211, the C1 region has the reflection at a lower density than the peripheral region. Pattern 226d is formed.

For example, the reflective pattern 226d may be a pattern printed on the reflective surface 226 of the light guide plate 220 or may be a pattern formed by processing the reflective surface 226.

24 is a cross-sectional view illustrating a reflector according to an exemplary embodiment of the present invention.

Referring to FIG. 24, a reflecting plate 240 is provided below the light guide plate 220. Specifically, the reflective plate 240 is provided at a position corresponding to the first flat surface 226a of the reflective surface 226 of the light guide plate 220, and the first flat surface 226a and the emission surface 225. ) Is parallel to the plate shape. As an example of the present invention, the reflecting plate 240 may be formed of a sheet of aluminum material having a high reflectance. Thus, the reflector 240 serves to reflect light leaking from the first flat surface 226a.

25 is a cross-sectional view illustrating a reflecting plate according to another exemplary embodiment of the present invention.

Referring to FIG. 25, the reflecting plate 241 according to another embodiment of the present invention is positioned at a position corresponding to the first flat surface 226a, the inclined surface 226b, and the second flat surface 226c of the light guide plate 220. It is provided, and has a structure inclined at the position of the inclined surface 226b. Accordingly, the reflective plate 241 reflects light leaking from the first flat surface 226a, the inclined surface 226b, and the second flat surface 226c.

FIG. 26 is a graph illustrating luminance of a light incident region according to a shape of a reflector. In FIG. 26, the x-axis represents positions of the light incident portion and the light portion relative to the center portion of the light guide plate 220, and the y-axis represents luminance. The twentieth graph G20 shows the luminance distribution when the reflecting plate 240 shown in FIG. 24 is adopted, and the twenty-first graph G21 shows the luminance distribution when the reflecting plate 241 shown in FIG. 25 is adopted. Indicates.

As shown in FIG. 26, the reflection plate 241 extends to the inclined surface 226b and the second flat surface 226c than the case where the reflection plate 240 is formed on the first flat surface 226a. The luminance in the light incident region was lower.

As can be seen from this, in order to suppress light leakage in the light incident region, the reflecting plate 241 is provided at a position corresponding to the first flat surface 226a, the inclined surface 226b and the second flat surface 226c. Can be.

27 is a cross-sectional view illustrating a light guide plate and a reflecting plate according to another exemplary embodiment of the present invention.

Referring to FIG. 27, when the reflective plate 240 is provided corresponding to the first flat surface 226a of the light guide plate 220, the portion corresponding to the inclined surface 226b of the light guide plate 220 may be diffused. Can be. Specifically, the diffusion process such as forming the scattering agent 228 in the region where the inclined surface 226b is formed can be suppressed to increase the luminance in the light incident region.

In this case, the light leakage phenomenon can be suppressed without extending the reflector 240 to the positions of the inclined surface 226b and the second flat surface 226c.

FIG. 28 is a cross-sectional view taken along the cutting line VII-VII ′ of FIG. 1.

Referring to FIG. 28, the backlight unit 200 is accommodated in the bottom 502 of the bottom chassis 500. In particular, the light source 210 is accommodated in the storage space defined by the bottom 502, the sidewall 504, and the cover 506.

The support film 212 of the light source unit 210 may be fixed to the bottom portion 502 of the bottom chassis 500 by a reflective tape 215. The reflective tape 215 may be made of a white material to reflect the light leaked from the light guide plate 220.

The light guide plate 220 is accommodated in the bottom chassis 500 such that the light source unit 210 and the incident surface 223 of the light guide plate 220 are adjacent to each other. The reflective plate 240 is interposed between the light guide plate 220 and the bottom portion 502. The reflective plate 240 is provided at a position corresponding to the first flat surface 226a of the light guide plate 220.

The optical sheets 230 are disposed on the light guide plate 220. The optical sheets 230 may be formed of four sheets. Specifically, the optical sheets 230 may be composed of one diffusion sheet, two prism sheets, and a protective sheet.

The inner surface of the cover portion 506 of the bottom chassis 500 is further provided with a reflective sheet 250 to cover the exit surface 225 corresponding to the non-effective emission area (NAE) of the light guide plate 220. Can be. The reflective sheet 250 may prevent light leakage from the invalid emission area NAE.

The display panel 106 is mounted on the cover part 506. A double-sided tape 510 may be interposed between the cover 506 and the display panel 106 to fix the display panel 106 to the cover 506. In addition, a full-layer film 520 may be further interposed between the double-sided tape 510 and the display panel 106 to prevent the display panel 106 from being damaged by an external impact.

As illustrated in FIG. 28, the bottom portion 502 of the bottom chassis 500 may be formed to be recessed to a predetermined depth toward the display panel 106. The point where the bottom portion 502 starts to sink may be closer to the center portion of the light guide plate 220 than at least the point where the first flat surface 226a starts. In addition, the depth of depression of the bottom portion 502 corresponds to a difference value between the first thickness t1 (shown in FIG. 14) and the second thickness t2 (shown in FIG. 14) of the light guide plate 220. It can have

As the bottom part 502 is recessed, a part accommodating part 550 capable of accommodating parts is formed on a rear surface of the bottom chassis 500. Components such as the battery 600 may be stored in the component accommodating part 550.

Therefore, it is possible to prevent the overall thickness of the display device 1000 from being increased by components such as the battery 600.

29 is a cross-sectional view of a display device according to another exemplary embodiment of the present invention. Of the components shown in FIG. 29, the same reference numerals are given to the same components as those shown in FIGS. 1 and 28, and detailed description thereof will be omitted.

Referring to FIG. 29, the backlight unit 200 is accommodated in the bottom 502 of the bottom chassis 500. In particular, the light source unit 215 is accommodated in the storage space defined by the bottom part 502, the side wall 504, and the cover part 506.

According to another embodiment of the present invention, the light source unit 215 includes a support substrate 214 and a plurality of light emitting diodes 213 mounted on the support substrate 214. The support substrate 214 is disposed such that an upper surface on which the plurality of light emitting diodes 213 are mounted is parallel to the incident surface 223 of the light guide plate 220.

The light guide plate 220 is accommodated in the bottom chassis 500 such that the light source unit 215 and the incident surface 223 of the light guide plate 220 are adjacent to each other. The reflective plate 241 is interposed between the light guide plate 220 and the bottom part 502.

The reflective plate 241 is provided at a position corresponding to the first flat surface 226a, the inclined surface 226b, and the second flat surface 226c of the light guide plate 220, and is inclined at the position of the inclined surface 226b. Has Accordingly, the reflective plate 241 reflects light leaking from the first flat surface 226a, the inclined surface 226b, and the second flat surface 226c.

As illustrated in FIG. 29, the bottom portion 502 of the bottom chassis 500 is recessed to a predetermined depth toward the display panel 106 to store parts on the bottom surface of the bottom chassis 500. The component accommodating part 550 is formed. Components such as the battery 600 may be stored in the component accommodating part 550. Therefore, it is possible to prevent the overall thickness of the display device 1000 from being increased by components such as the battery 600.

30 is a plan view of a backlight unit according to another exemplary embodiment of the present invention, and FIG. 31 is a cross-sectional view taken along the line VII- ′ ′ of FIG. 30.

30 and 31, a backlight unit according to another embodiment of the present invention includes a plurality of first light emitting diodes 211 and the light guide plate 220 provided adjacent to the third side surface 223 of the light guide plate 220. And a plurality of second light emitting diodes 213 provided adjacent to the fourth side 224 of the second side 224. Here, the third side 223 is defined as a first incident surface, and the fourth side 224 May be defined as the second incident surface.

According to another embodiment of the present invention, the emission surface 225 of the light guide plate 220 is the first region (A1), the second region (A2) and the third sequentially adjacent to the first incident surface 223 It may be divided into an area A3. The second region A2 may include a first lenti area RA1, a second lenti area RA2, and a third lenti area RA3.

The first lenti area RA1 is an area adjacent to the first region A1, and the third lenti area RA3 is an area adjacent to the third area A3, and the second lenti area ( RA2) is located between the first and third lenti regions RA1 and RA3.

The light guide plate 220 includes a protrusion 227 formed in the second area A2. Specifically, the protrusion 227 is not formed in the first and third regions A1 and A3.

As an example, the protrusion 227 may have a semi-conical shape in the first and third lenti areas RA1 and RA3, and may have a semi-cylindrical shape in the second lenti areas RA2. .

That is, the height of the protrusion 227 increases in the first lenient region RA1 as the distance from the first incident surface 223 increases, and the diameter of the protrusion 227 also increases from the first incident surface 223. Increase as you move away. In addition, in the third lenti area RA3, the height of the protrusion 227 increases as the distance from the second incidence surface 224 increases, and the diameter of the protrusion 227 also increases from the second incidence surface 224. Increase as you move away. Meanwhile, in the second lenti region RA2, the height and diameter of the protrusion 227 maintain a constant value.

In addition, since the shape and size of the protrusion 227 overlap with the contents described above with reference to the drawings, a detailed description thereof will be omitted below.

According to another embodiment of the present invention, the reflective surface 226 of the light guide plate 220 is adjacent to the first flat surface 226a, the first incident surface 223 parallel to the emission surface 225, and The first inclined surface 226b inclined toward the exit surface 225, the second flat surface 226c connecting the first inclined surface 226b and the first incident surface 223, and the second incident surface 224. A second inclined surface 226e adjacent to and inclined toward the exit surface 225, and a third flat surface 226f connecting the second inclined surface 226e and the second incidence surface 224.

The first inclined surface 226b is inclined in a direction away from the exit surface 225 toward the first incident surface 223. The second flat surface 226c is provided in parallel with the emission surface 225 between the first inclined surface 226b and the incident surface 223.

The second inclined surface 226e is inclined in a direction away from the exit surface 225 toward the second incident surface 224. The third flat surface 226f is provided in parallel with the emission surface 225 between the second inclined surface 226e and the second incident surface 224.

Since the first and second inclined surfaces 226b and 226e are formed in a similar form to the inclined surface 226b described above, detailed descriptions of the first and second inclined surfaces 226a and 226e will be omitted.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical idea or essential features thereof. You will understand that. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive.

1000: display device 100: display unit
200: backlight unit 300: top chassis
400: mold frame 500: bottom chassis

Claims (28)

A light source for generating light; And
An incident surface receiving the light, the first region and a second region that emit light incident through the incident surface and are sequentially arranged in a second direction perpendicular to a first direction that is a longitudinal direction of the incident surface; A light guide plate having an emission surface, a reflection surface facing the emission surface and reflecting the incident light, and a protrusion disposed directly on the emission surface and having a lenticular shape,
The reflective surface,
An inclined surface that overlaps the first region and is inclined from the incidence surface toward the exit surface;
The protrusion,
A backlight unit overlapping the second area and spaced apart from the inclined surface. The method of claim 1,
The protrusion unit has a semi-cylindrical shape extending in the second direction. According to claim 1, wherein the second region is the first lenti region having a semi-conical shape extending in the second direction and the projection has a semi-cylindrical shape extending in a direction perpendicular to the longitudinal direction of the incident surface And a back-end area. The backlight unit of claim 3, wherein a height and a diameter of the protrusion in the first lenti area increase as the distance from the incident surface increases. The method of claim 4, wherein when the width of the first lenti region in the second direction is defined as a, and the maximum height of the protrusion in the first lenti region is defined as b,
A and b are

Satisfying,
And wherein θ is less than 0.03 °. The backlight unit of claim 3, wherein the protrusion part has a constant height and a diameter in the second lenti area. The backlight unit of claim 3, wherein the protrusion has the same curvature in the first and second lenti regions. 2. The width of the first region (the length of the incidence surface) of claim 1, wherein the width of the region where the inclined surface is formed (a vertical distance from the point where the inclined surface starts to the point where the inclined surface ends) is determined based on the incidence surface. Width in a direction perpendicular to the direction)
The backlight unit, characterized in that inclined in a direction away from the exit surface toward the incident surface side. The backlight unit of claim 8, wherein the inclination angle of the inclined surface is 2 ° to 5 °. The light emitting panel of claim 8, wherein the light emitting plate is divided into an effective light emitting area and an ineffective light emitting area.
And the incident surface and the protrusion are spaced apart by the width of the first region, and the first region is included in the ineffective light emitting region. The backlight unit of claim 8, wherein the reflective surface further comprises a first flat surface parallel to the emission surface and a second flat surface parallel to the emission surface between the incidence surface and the inclined surface. The backlight unit of claim 8, wherein the light guide plate further includes a reflection pattern provided on the reflection surface to reflect the light incident through the entrance surface to the emission surface. The light source of claim 12, wherein the light source includes a plurality of light emitting diodes arranged along a length direction of the incident surface.
And the reflective pattern in the second region has a lower density in a region between two light emitting diodes adjacent to each other than a region corresponding to the light emitting diode. The backlight unit of claim 1, further comprising a reflector disposed under the reflective surface to reflect light leaked from the reflective surface to the emission surface. The backlight unit of claim 14, wherein the reflecting plate has a flat plate shape parallel to the emission surface. The backlight unit of claim 15, wherein the light guide plate further comprises a scattering agent formed corresponding to the inclined surface. The backlight unit of claim 14, wherein the reflecting plate has a structure inclined along the inclined surface. A display unit for displaying an image;
A backlight unit providing light to the display unit; And
A storage container for storing the backlight unit,
The backlight unit,
A light source for generating light; And
An incident surface receiving the light, the first region and a second region that emit light incident through the incident surface and are sequentially arranged in a second direction perpendicular to a first direction that is a longitudinal direction of the incident surface; A light guide plate having an emission surface, a reflection surface facing the emission surface and reflecting the incident light, and a protrusion disposed directly on the emission surface and having a lenticular shape,
The reflective surface,
An inclined surface that overlaps the first region and is inclined from the incidence surface toward the exit surface;
The protrusion,
The display device overlapping the second area and spaced apart from the inclined surface. 19. The method of claim 18, wherein the second region includes a first lenti region having a semi-conical shape extending in the second direction and a second lenti region having a semi-cylindrical shape with the protrusion extending in the second direction. ,
And the height of the protrusion increases in the first lenient area away from the incident surface. 20. The method of claim 19, wherein when the width of the first lenti region in the second direction is defined as a, and the maximum height of the protrusion in the first lenti region is defined as b,
A and b are

Satisfying,
Wherein θ is smaller than 0.03 °. 19. The width of the first region of claim 18, wherein the width of the region where the inclined surface is formed (a vertical distance from the point where the inclined surface starts to the point where the inclined surface ends) is determined by the width of the first region. Width in a direction perpendicular to the direction)
It is inclined in a direction away from the exit surface toward the incident surface side,
And an inclination angle of the inclined surface is 2 ° to 5 °. The light emitting panel of claim 21, wherein the light emitting plate is divided into an effective light emitting area and an ineffective light emitting area.
And the incident surface and the protrusion are spaced apart from each other by the width of the first region, and the first region is included in the ineffective light emitting region. The display device of claim 21, wherein the light guide plate further includes a reflection pattern provided on the reflection surface to reflect the light incident through the entrance surface to the emission surface. The method of claim 23, wherein the light source comprises a plurality of light emitting diodes arranged along the longitudinal direction of the incident surface,
And the reflection pattern in the second area has a lower density in a region between two light emitting diodes adjacent to each other than a region corresponding to the light emitting diode. 19. The display device of claim 18, further comprising a reflector disposed under the reflecting surface to reflect light leaked from the reflecting surface to the emission surface. The method of claim 25, wherein the reflecting plate has a flat plate shape parallel to the exit surface,
The light guide plate further comprises a scattering agent formed corresponding to the inclined surface. The method of claim 18, wherein the storage container,
A bottom part on which the backlight unit is mounted;
Sidewalls extending from the bottom portion; And
And a cover part extending in parallel with the bottom part from the side wall to cover the light source. 28. The display device according to claim 27, wherein the bottom portion of the storage container is recessed toward the light guide plate to provide a component receiving part on a rear surface of the storage container.

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