KR20130105215A - Light guide panel and back light unit having the same - Google Patents

Abstract

PURPOSE: A light guide plate and a back light unit including the same are provided to improve the efficiency of production and reduce the cost of production while maintaining the performance of traditional light guide plates in terms of light efficiency and 3D scanning and so on. CONSTITUTION: A light guide plate comprises a plurality of lenticular patterns (117) formed on a front surface or a rear surface; and a plurality of light emission patterns (118) for guiding light emitted from a light source to a front surface. The plurality of light emission patterns are integrated with the plurality of lenticular patterns.

Description

LIGHT GUIDE PANEL AND BACK LIGHT UNIT HAVING THE SAME}

The present invention relates to a light guide plate and a backlight unit having the same, and more particularly, to a light guide plate having lenticular patterns and a backlight unit having the same.

Liquid crystal display devices, commonly referred to as liquid crystal displays (LCDs), generally include a display panel for displaying an image and a backlight unit for supplying light behind the display panel. Such liquid crystal display devices are applied to display devices such as televisions and computer monitors.

Various types of backlight units exist, and edge type backlight units generally include a plurality of light sources (eg, LEDs) disposed at the side and a light guide panel (LGP) for guiding light supplied by the light sources toward the display panel. ).

Such a light guide plate generally includes a plurality of light emitting patterns having a dot shape to guide light toward a display panel. Meanwhile, when applied to a display device capable of providing a stereoscopic image (3D image), the light guide plate may have a plurality of lenticular patterns formed on one surface thereof to improve 3D scanning efficiency. When the light guide plate has lenticular patterns together with the light exit patterns, the light exit patterns are generally provided on the rear surface of the light guide plate and the lenticular patterns are provided on the front surface of the light guide plate.

SUMMARY OF THE INVENTION An object of the present invention is to provide a light guide plate and a backlight unit having the same, which can improve productivity and reduce manufacturing costs while maintaining at least the level of a conventional light guide plate in terms of performance such as light efficiency and 3D scanning efficiency.

In order to achieve the above object, the present invention, in the light guide plate for a display device having a front and rear, and four edge surfaces, and receives light from the light sources through at least one of the edge surfaces, A plurality of lenticular patterns formed on one of the front side and the rear side; And a plurality of light exit patterns for guiding light incident from the light sources toward the front surface, wherein the plurality of light exit patterns are integrally formed in the plurality of lenticular patterns. .

Each of the light exit patterns may have one curved surface.

Each of the light exit patterns may be concave or convex from the surfaces of the lenticular patterns.

Each of the light exit patterns may be concave from the lenticular patterns, and may have two reflective surfaces that are inclined with respect to the front surface or the rear surface.

Preferably, the two reflective surfaces are each flat.

Preferably, the two reflective surfaces are inclined with respect to the rear surface of 35 ° to 80 °.

The angle between the two reflective surfaces is preferably 70 ° to 110 °.

The pitch between two adjacent light exit patterns is preferably 0.5 mm or less.

Preferably, the light is incident through two edge surfaces disposed on opposite sides of the four edge surfaces.

In order to achieve the above object, the present invention also provides a light guide plate having a front and rear, and four edge surfaces; At least one light source unit providing light into the light guide plate through at least one edge surface of the four edge surfaces; A rear optical sheet unit disposed behind the light guide plate; And a front optical sheet unit disposed in front of the light guide plate, wherein the light guide plate includes: a plurality of lenticular patterns formed convexly on one of the front side and the rear side; And a plurality of outgoing patterns for guiding light incident from the light sources toward the front surface, wherein the plurality of outgoing patterns are integrally formed in the plurality of lenticular patterns. do.

Each of the light exit patterns may include one curved surface.

The front optical sheet unit may include a plurality of optical sheets.

The front optical sheet unit may include a diffusion sheet, a prism sheet, and a protective sheet.

The front optical sheet unit may include a diffusion sheet, a prism sheet, and a reflective polarizing sheet.

Each of the light exit patterns may be concave from the lenticular patterns, and may have two reflective surfaces that are inclined with respect to the front surface or the rear surface.

The front optical sheet portion may be comprised of only one optical sheet.

The front optical sheet portion may include only the diffusion sheet.

1 is a plan view of a light guide plate according to an exemplary embodiment of the present invention.
FIG. 2 is a schematic rear perspective view of the light guide plate shown in FIG. 1.
3 is an enlarged partial cross-sectional view of FIG. 2 along the III-III line.
4 is a schematic partial cross-sectional view illustrating an embodiment of a backlight unit to which the light guide plate illustrated in FIGS. 1 to 3 is applied.
5 is a plan view of a light guide plate according to a second exemplary embodiment of the present invention.
FIG. 6A is a schematic rear perspective view of the light guide plate illustrated in FIG. 5.
6B is a rear perspective view of a light guide plate according to an alternative embodiment.
FIG. 7 is a side view of the light guide plate illustrated in FIG. 5.
8 is a partial cross-sectional view of FIG. 7 along the VIII-VIII line.
9 is a schematic partial cross-sectional view illustrating an embodiment of a backlight unit to which the light guide plate illustrated in FIGS. 5 to 8 is applied.
10A and 10B are luminance distribution photographs and corresponding graphs obtained from test # 1.
11A and 11B are luminance distribution photographs and corresponding graphs obtained from test # 2.
12A and 12B are luminance distribution photographs and corresponding graphs obtained from test # 3.
13A and 13B are luminance distribution photographs and corresponding graphs obtained from test # 4.
14A and 14B are luminance distribution photographs and corresponding graphs obtained from test # 5.
15A and 15B are luminance distribution photographs and corresponding graphs obtained from test # 6.
16A and 16B are photographs of the light guide plate of the prior art obtained from the 3D scanning efficiency test and the light guide plate of the present invention.
FIG. 17 illustrates two graphs reflecting luminance distribution data of the center of the light guide plate among the data of Tables 3 and 4.

Hereinafter, a light guide plate and a backlight unit according to embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a plan view of a light guide plate according to an embodiment of the present invention, FIG. 2 is a schematic rear perspective view of the light guide plate shown in FIG. 1, and FIG. 3 is an enlarged partial cross-sectional view of FIG. 2 along a III-III line.

1 to 3, the light guide plate 110 according to an embodiment of the present invention has a substantially rectangular plate shape, and thus the light guide plate 110 has a front surface 111, a rear surface 112, and four edge surfaces 113. , 114, 115, 116.

Here, the front surface 111 refers to a surface facing the display panel (not shown) and the rear surface 112 refers to the opposite surface. In addition, for convenience of description, the four edge surfaces are also referred to as first edge surface 113, second edge surface 114, third edge surface 115, and fourth edge surface 116, respectively, where the first edge surface is referred to as the first edge surface 113. The surface 113 and the second edge surface 114 are disposed opposite to each other, and the third edge surface 115 and the fourth edge surface 116 are disposed opposite to each other.

As shown in FIG. 1, the lights L from the light sources are introduced into the light guide plate 110 through the first edge surface 113 and the second edge surface 114. Although light is incident on the two edge surfaces 113 and 114 in the present embodiment, light may be incident only on one of the four edge surfaces 113 in alternative embodiments.

2 and 3, a plurality of lenticular patterns 117 are formed in the convex shape on the rear surface 112 of the light guide plate 110 to increase 3D scanning efficiency. The lenticular patterns 117 extend evenly between the first edge surface 113 and the second edge surface 114 that receive light, and are arranged in parallel with each other. Each lenticular pattern 117 has an approximately semicircular cross section, the cross sectional shape may vary depending on embodiments.

The lenticular patterns 117 serve to minimize the spread of light incident through the first and second edge surfaces 113 and 114 in the width direction (ie, the Y direction) of the light guide plate 110. That is, the lenticular patterns 117 function so that light incident through the first and second edge surfaces 113 and 114 has a greater linearity along the longitudinal direction (ie, the X direction) of the light guide plate 110. . The greater the linearity of the incident light due to the lenticular patterns 117, the higher the 3D scanning efficiency is.

Although the lenticular patterns 117 are illustrated as being formed on the rear surface 112 of the light guide plate 110 in the present embodiment, in other alternative embodiments, the lenticular patterns 117 may be the front surface 111 of the light guide plate 110. It may be formed in.

As illustrated in FIGS. 2 and 3, a plurality of light emission patterns 118 are integrally formed in the lenticular patterns 117. The light exit patterns 118 serve to direct light toward the display panel by scattering light in various directions.

The light exit pattern 118 has one curved shape corresponding to a portion of the spherical surface. In alternative alternative embodiments, it may have other curved shapes than the spherical shape of the light exit pattern 118. The light exit pattern 118 is formed concave from the surface 117a of the lenticular pattern 117. In alternative alternative embodiments, the light exit pattern 118 may be convexly formed from the surface 117a of the lenticular pattern 117.

The shape of the light exit pattern 118 described above is often referred to as a dot form. More precisely, the shape of the light output pattern 118 is referred to as a dot form when the light output pattern 118 has a substantially circular cross section along the X-Y plane. In alternative alternative embodiments, the light exit pattern 118 may have a bar shape rather than a dot shape. That is, the light exit pattern 118 may not have a circular cross section with respect to the X-Y plane, but may have a cross section extending longer in the length direction (X direction) or the width direction (Y direction) of the light guide plate 110.

Since the light output patterns 118 are integrated in the lenticular patterns 117, the lenticular patterns 117 and the light output patterns 118 may be formed simultaneously. Imprinting, extrusion, or injection may be applied for simultaneous molding of the lenticular patterns 117 and the light exit patterns 118.

As an example, the manufacturing method of the light guide plate 110 during imprinting will be described. First, a mold corresponding to the shape of the lenticular patterns 117 into which the light emission patterns 118 are integrated is pressed once by a dough light guide plate material (eg, PolyMethyMethacrylate: PMMA) containing a curing initiator. The light guide plate material imparts the shapes of the lenticular patterns 117 in which the outgoing patterns 118 are integrated. Thereafter, the final light guide plate 110 is obtained by irradiating ultraviolet rays to cure the light guide plate material.

As such, when the light guide plate 110 is manufactured, the lenticular patterns 117 and the light exit patterns 118 may be molded by one process (that is, simultaneously). As a result, the manufacturing of the LGP 110 may be considerably simple, and thus the LGP manufacturing cost may be reduced.

In contrast, in the conventional light guide plate, the lenticular patterns and the light exit patterns are generally formed on two different surfaces of the light guide plate without being integrated with each other. For example, lenticular patterns are formed on the front surface of the light guide plate, and light emission patterns are formed on the rear surface of the light guide plate. In the conventional light guide plate, outgoing patterns are formed through a post-process such as laser processing or printing on a light guide plate disc in which lenticular patterns are formed in advance.

As described above, in manufacturing a conventional light guide plate in which the light emission patterns are not integrated in the lenticular patterns, since the molding process of the lenticular patterns and the molding process of the light exit patterns are separated, manufacturing is complicated and a large manufacturing cost is compared with the present invention.

4 is a schematic partial cross-sectional view illustrating an embodiment of a backlight unit to which the light guide plate illustrated in FIGS. 1 to 3 is applied.

Referring to this, the backlight unit 100 includes the light guide plate 110, the light source unit 120, the rear optical sheet unit 130, and the front optical sheet unit 140.

As described above, the light guide plate 110 includes a plurality of lenticular patterns 117 formed on the rear surface 112 of the light guide plate 110, and light output patterns 118 are integrally formed on the lenticular patterns 117.

The light source unit 120 is disposed to face the first edge surface 113 of the light guide plate 110. The light source unit 120 includes a circuit board 121 and a plurality of light sources 122 mounted on the circuit board 121. For example, the light source 122 may be provided as an LED. Light from the plurality of light sources 122 may be input into the light guide plate 110 through the first edge surface 113. Although not shown, another light source unit having the same structure as the light source unit 120 illustrated in FIG. 4 is disposed to face the second edge surface 114 of the light guide plate 110.

The rear optical sheet unit 130 is disposed behind the light guide plate 110 and includes a reflective sheet 131. The reflective sheet 131 reflects light leaking from the rear surface 112 of the light guide plate 110 toward the light guide plate 110.

The front optical sheet unit 140 is disposed in front of the light guide plate 110 and includes a diffusion sheet 141, a prism sheet 142, and a protective sheet 143. The diffusion sheet 141 serves to diffuse the light emitted from the light guide plate 110, the prism sheet 142 functions to collect the light diffused by the diffusion sheet 141, and the protective sheet 143 It functions to protect the prism sheet 142 and to increase the light uniformity. In an alternative embodiment, the protective sheet 143 may be replaced with a reflective polarizing sheet to improve light efficiency. Here, the reflective polarizing sheet is a reflective polarizing prism sheet having a multi-layered structure that condenses and polarizes light and emits light, and a representative example thereof may include 3M's Dual Brightness Enhancement Film (DBEF ^™ ).

As shown in FIG. 4, the lights L generated by the light sources 122 are emitted toward the front of the light guide plate 110 by the light guide plate 110 and the reflective sheet 131, and the output light is three pieces. The luminance uniformity and the viewing angle are improved while passing through the front optical sheets 141, 142, and 143, and then incident on the display panel (not shown).

5 is a plan view of a light guide plate according to a second embodiment of the present invention, FIG. 6A is a schematic rear perspective view of the light guide plate shown in FIG. 5, FIG. 6B is a rear perspective view of a light guide plate according to an alternative embodiment, and FIG. 7. 5 is a side view of the light guide plate illustrated in FIG. 5, and FIG. 8 is a partial cross-sectional view of FIG. 7 along the line VII-VII.

5 to 8, the light guide plate 210 according to the second embodiment of the present invention has a substantially rectangular plate shape, and thus the light guide plate 210 has a front surface 211, a rear surface 212, and four edge surfaces ( 213, 214, 215, 216. For convenience of description, the four edge surfaces are referred to as the first edge surface 113, the second edge surface 114, the third edge surface 115, and the fourth edge surface 116, respectively.

The lights L emitted from the light sources are introduced into the light guide plate 210 through the first edge surface 213 and the second edge surface 214. Although light is incident on two edge surfaces 213 and 214 in this embodiment, light may be incident only through one of the four edge surfaces 213 in alternative embodiments.

The structure of the light guide plate 210 is almost similar to that of the light guide plate 110 described above. That is, like the light guide plate 110 described above, in the case of the light guide plate 210 according to the second embodiment, a plurality of lenticular patterns 217 are formed on the rear surface 212 of the light guide plate 210 and the light emission patterns 218 is integrally formed in the lenticular patterns 217. As shown in FIG. 6A, the light output patterns 218 formed on the light guide plate 210 according to the present exemplary embodiment have a regular arrangement. However, as shown in FIG. 6B, in alternative alternative embodiments, the light exit patterns 218 may have an irregular arrangement.

However, the light exit patterns 218 of the light guide plate 210 according to the second embodiment are different in shape from the light exit patterns 118 of the light guide plate 110 according to the above-described embodiment. This will be described in detail as follows.

As shown in FIGS. 6A and 8, the light output patterns 218 are formed concave from the surfaces of the lenticular patterns 217. Each of the light exit patterns 218 has two reflective surfaces 218a and 218b to have a shape similar to that of a prism. The reflective surfaces 218a and 218b of the light output patterns 218 are distinguished from those of the aforementioned light output patterns 118 (see FIG. 3) in that they have a curved surface.

Referring to FIG. 8, the pair of reflective surfaces 218a and 218b have an angle α and are symmetrical with respect to the Z axis. It is preferable that the angle α between these two reflection surfaces 218a and 218b is in the range of 70 ° to 110 °. In addition, each of the reflecting surfaces 218a and 218b is inclined with respect to the front surface 211 or rear surface 212 of the light guide plate 210 (ie, with respect to the X axis), and the inclination angle β is in a range of 35 ° to 80 °. It is preferable to be inside.

Meanwhile, the pitch between two adjacent light exit patterns 218 is preferably 0.5 mm or less. 6A, only three outgoing patterns 218 are formed in one lenticular 217 in FIG. 6A, but this is merely exemplary, and the actual number of outgoing patterns 218 is larger than that. It is preferable.

Like the light guide plate 110 of the above-described embodiment, the light guide plate 210 of the second embodiment may be imprinted, extruded, or injected for the production thereof, and by applying these methods, the lenticular patterns 217 and the light exiting are applied. The patterns 218 may be molded by one process (ie, simultaneously). Therefore, the light guide plate 210 according to the second embodiment of the present invention may be simplified in manufacturing process, and thus, manufacturing cost may be reduced as compared with a conventional light guide plate in which light emission patterns are formed through a post process such as laser processing or printing.

9 is a schematic partial cross-sectional view illustrating an embodiment of a backlight unit to which the light guide plate illustrated in FIGS. 5 to 8 is applied.

Referring to this, the backlight unit 200 includes the light guide plate 210, the light source unit 220, the rear optical sheet unit 230, and the front optical sheet unit 240 described above.

As described above, the light guide plate 210 has a plurality of lenticular patterns 217 formed on the rear surface 212, and light output patterns 218 are integrally formed on the lenticular patterns 217. In addition, the light output patterns 218 have two reflective surfaces 218a and 218b to have a cross-sectional shape similar to that of a prism cross section.

The light source unit 220 and the rear optical sheet unit 230 are the same as the light source unit 120 and the rear optical sheet unit 130 of FIG. 4.

The front optical sheet portion 240 has only one sheet of diffusion sheet 241, which is distinguished from the front optical sheet portion 140 described above in this respect.

As such, the backlight unit 200 includes only one optical sheet 241 in front of the light guide plate 210, but the light guide plate 210 has light output patterns 218 having two flat reflective surfaces 218a and 218b. As a result, it is possible to maintain at least an equivalent level in terms of various optical performances (light efficiency, viewing angle, 3D scanning efficiency, etc.) compared to other backlight units having a plurality of front optical sheets such as the backlight unit 100 described above.

In order to verify the optical performance of the light guide plate 210 according to the second embodiment, the inventors of the present application performed tests. In the test, the same type of light guide plate 210 as the above-described light guide plate 210 was used, and a conventional light guide plate was used in which lenticular patterns were formed on the front surface and dot-shaped light emission patterns were formed on the rear surface.

As shown in Table 1, a test was performed for four cases while sequentially adding a diffusion sheet, a prism sheet, and a protective sheet to the conventional light guide plate, and for the light guide plate 210 of the present invention. Tests were performed for the case without the front optical sheet and for the case with only one diffusion sheet, i.e. two cases.

Condition (front optical sheet used)  Viewing angle obtained

Prior art

Test # 1
none
80 °
Test # 2
Diffusion sheet
50 °
Test # 3
Diffusion sheet + prism sheet
0 °
Test # 4
Diffusion sheet + prism sheet + protection sheet
0 °
Invention

Test # 5
none
-10 ° to +10 °
Test # 6
Diffusion sheet
0 °

As a test result for the above six cases related to the prior art and the present invention, a luminance distribution photograph taken from the front of the light guide plate and a corresponding graph were obtained, and the luminance distribution photographs and corresponding graphs obtained are shown in FIGS. 10A to 15B. .

That is, FIGS. 10A and 10B are luminance distribution photographs and corresponding graphs obtained from test # 1, FIGS. 11A and 11B are luminance distribution photographs and corresponding graphs obtained from test # 2, and FIGS. 12A and 12B are luminance distributions obtained from test # 3. 13A and 13B are luminance distribution photographs and corresponding graphs obtained from test # 4, and FIGS. 14A and 14B are luminance distribution photographs and corresponding graphs obtained from test # 5, and FIGS. 15A and 15B are test # 6. The luminance distribution photograph and the corresponding graph obtained from the.

Referring to Figs. 10A to 13B related to the prior art, in the prior art, good luminance is achieved only when three optical sheets, namely, a diffusion sheet, a prism sheet, and a protective sheet are disposed in front of the light guide plate as in Test # 4. It can be understood that a viewing angle of 0 ° is obtained while showing uniformity.

On the other hand, referring to Figs. 14A to 15B related to the light guide plate 210 of the present invention, in the case of the present invention, as in Test # 6, only one sheet of diffusion sheet is disposed in front of the light guide plate to obtain good luminance uniformity. It is understood that a viewing angle of 0 ° can be obtained while showing.

The center luminance, average luminance, and luminance uniformity calculated from the aforementioned test # 4 and test # 6 are summarized in the following [Table 2].

Test # 4 (Prior Art)

Test # 6 (invention)

Front optical sheet used 3 sheets
(Diffusion sheet + prism sheet + protective sheet) 1 sheet
(Diffusion sheet)
Center luminance
6100 nits (100%)
6710 nits (110%)
Average brightness
5861 nits (100%)
6447 nits (110%)
Luminance uniformity
82%
82%

Referring to [Table 2], the light guide plate 210 of the present invention exhibits the same luminance uniformity as compared to the light guide plate of the prior art even though only one diffusion sheet is used, but is about 10 in terms of the center luminance and the average luminance. It can be seen that the% improvement.

In addition, a test for comparing 3D scanning performance with respect to the light guide plate 210 of the present invention and the light guide plate of the prior art was also performed, wherein the light guide plate used in the aforementioned test # 1 to # 4 was used as the light guide plate of the prior art. As the light guide plate of the present invention, the light guide plate used in the aforementioned test # 5 to # 6 was used.

In this test, only one light source among the plurality of light sources (LEDs) arranged on one side of the light guide plate is turned on and other light sources in the vicinity thereof are turned off. This was done by measuring the luminance with respect to the center part.

The photographs obtained from this test are shown in FIGS. 16A and 16B, and the numerical data calculated from this test are summarized in the following [Table 3] and [Table 4], while the graphs corresponding to the data of these tables are shown. It is shown together in FIG.

16A and 16B are photographs of the light guide plate of the prior art obtained from the 3D scanning efficiency test and the light guide plate of the present invention. And Tables 3 and 4 below are the light guide plates of the prior art obtained from the 3D scanning efficiency test and the data calculated for the light guide plates of the present invention. 17 illustrates two graphs reflecting luminance distribution data of a central portion of the light guide plate among the data of Tables 3 and 4.

No Light source (LED) Actual measurement percentage(%) One OFF Light receiver Center Light receiver Center 2 ON 49 36 18% 50% 3 OFF 278 72 100% 100% 4 OFF 35 36 13% 50% 5 OFF 8 8 3% 11% 6 OFF 2 2 One% 3% 7 OFF One One 0% One% 8 OFF One 0.5 0% One% 9 OFF 0.5 0.5 0% One% Max 278 72 100% 100% Contrast (N + 3 / N) 0.7% 3.0%

No Light source (LED) Actual measurement percentage(%) One OFF Light receiver Center Light receiver Center 2 ON 34 35 14% 41% 3 OFF 278 86 100% 100% 4 OFF 37 37 16% 43% 5 OFF 7 9 3% 10% 6 OFF 3 3 One% 3% 7 OFF 2 2 One% 2% 8 OFF One One 0% One% 9 OFF One One 0% One% Max 238 86 100% 100% Contrast (N + 3 / N) 1.3% 3.0%

From Tables 3 and 4, it can be seen that the ratio of the luminance of the central portion corresponding to the fifth light source to the luminance of the central portion corresponding to the second light source is represented by 3%. From this, even when using the light guide plate 210 of the present invention, it can be seen that the 3D scanning efficiency is not lowered compared to the light guide plate of the prior art. This fact can also be easily confirmed from the graph of FIG. 17. In the graph of FIG. 17, the horizontal axis represents LED numbers and the vertical axis represents luminance at the center of the light guide plate. In addition, the graph indicated by the '■' mark in Fig. 17 is for the light guide plate of the prior art, the graph indicated by the '×' mark is for the light guide plate of the present invention.

110: light guide plate 117: lenticular pattern
118: light output pattern 140: front optical sheet portion
210: Light guide plate 217: Lenticular pattern
218: Outgoing pattern 240: Front optical sheet portion

Claims (17)

A light guide plate for a display device having a front surface and a rear surface and four edge surfaces, and receiving light from light sources through at least one of the edge surfaces.
A plurality of lenticular patterns formed on one of the front side and the rear side; And
A plurality of light emission patterns for guiding light incident from the light sources toward the front surface;
The plurality of light exit patterns are formed on the plurality of lenticular patterns integrally formed in the light guide plate for a display device. The method of claim 1,
The light guide plate for a display device, characterized in that each of the light exit pattern has one curved surface. 3. The method of claim 2,
Wherein each of the light emission patterns is concave or convex from the surfaces of the lenticular patterns. The method of claim 1,
Wherein each of the light exit patterns is concave from the lenticular patterns and has two reflective surfaces that are inclined with respect to the front surface or the rear surface. 5. The method of claim 4,
Wherein the two reflective surfaces are planar, respectively. The method of claim 5,
The angle of inclination of the two reflective surfaces with respect to the back is a light guide plate for a display device, characterized in that 35 ° to 80 °. The method of claim 5,
Light guide plate for a display device, characterized in that the angle between the two reflection surface is 70 ° to 110 °. 5. The method of claim 4,
A light guide plate for a display device, characterized in that the pitch between two adjacent light exit patterns is 0.5 mm or less. The method of claim 1,
The light guide plate of claim 4, wherein the light is incident through two edge surfaces disposed on opposite sides of the four edge surfaces. A light guide plate having front and rear sides and four edge surfaces;
At least one light source unit providing light into the light guide plate through at least one edge surface of the four edge surfaces;
A rear optical sheet unit disposed behind the light guide plate; And
A front optical sheet unit disposed in front of the light guide plate;
The light-
A plurality of lenticular patterns formed convexly on one of the front side and the rear side; And
A plurality of light emission patterns for guiding light incident from the light sources toward the front surface;
And the plurality of light exit patterns are integrally formed in the plurality of lenticular patterns. The method of claim 10,
And each of the light exit patterns includes one curved surface. 12. The method of claim 11,
And the front optical sheet part includes a plurality of optical sheets. The method of claim 12,
The front optical sheet unit includes a diffusion sheet, a prism sheet, and a protective sheet. The method of claim 12,
The front optical sheet unit includes a diffusion sheet, a prism sheet, and a reflective polarizing sheet. The method of claim 10,
Wherein each of the light exit patterns is concave from the lenticular patterns and has two reflective surfaces that are inclined with respect to the front surface or the rear surface. 16. The method of claim 15,
And said front optical sheet portion comprises only one optical sheet. 17. The method of claim 16,
And said front optical sheet portion comprises only a diffusion sheet.

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