KR101808562B1 - Light guide plate and liquid crystal display device - Google Patents

Abstract

The present invention relates to a backlight unit and a liquid crystal display device having a narrow bezel.
According to the present invention, by embedding a plurality of LEDs in a light-incident portion of a light guide plate, a space required for disposing the LED assembly can be minimized, thereby reducing the width of the bezel and increasing the light incident efficiency of light incident on the light guide plate.
Accordingly, it is possible to realize a liquid crystal display device having a high brightness and a narrow width of the bezel.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a light guide plate,

The present invention relates to a light guide plate and a liquid crystal display device capable of minimizing light loss to realize high brightness and to reduce the width of a bezel.

A liquid crystal display device (LCD), which is advantageous for moving picture display and has a large contrast ratio and is actively used in TVs and monitors, exhibits optical anisotropy and polarization properties of a liquid crystal, And the like.

Such a liquid crystal display device has a liquid crystal panel in which a liquid crystal panel is interposed between two adjacent substrates through a liquid crystal layer as an essential component and changes the alignment direction of the liquid crystal molecules in an electric field in the liquid crystal panel to realize a difference in transmittance do.

However, since the liquid crystal panel does not have its own light emitting element, a separate light source is required to display the difference in transmittance as an image. To this end, a backlight unit having a light source is disposed on the back of the liquid crystal panel.

As a light source of the backlight unit, a fluorescent lamp such as a cold cathode fluorescent lamp (CCFL) or an external electrode fluorescent lamp (EEFL) has been widely used. Recently, however, Light-emitting diodes (LEDs), which have advantages in terms of power consumption, weight, and brightness, have been replacing fluorescent lamps with lightweight trends.

Such a backlight unit is divided into a direct type and an edge type according to the position of a light source. The backlight unit of the direct-type type has a structure in which a light source is disposed under a liquid crystal panel, In the backlight unit of the side-type system, a light guide plate is disposed under the liquid crystal panel, and a light source is disposed on at least one side of the light guide plate so that light emitted from the light source is indirectly reflected To the liquid crystal panel.

In particular, the side-type backlight unit is more easily manufactured than the direct-type backlight unit, and is widely used because of its thin shape, light weight, and low power consumption.

1 is a cross-sectional view of a conventional lateral type liquid crystal display device.

1, the liquid crystal display device 1 includes a liquid crystal panel 10 constituted by first and second substrates 12 and 14 and a backlight unit 20 located behind the liquid crystal panel 10.

The liquid crystal panel 10 and the backlight unit 20 are modularized through the top cover 40, the support main body 30 and the cover bottom 50.

The liquid crystal panel 10 is a part that plays a key role in image display. The first and second substrates 12 and 14 constituting the liquid crystal panel 10 include first and second polarizers (19a, 19b), respectively.

The backlight unit 20 includes an LED assembly 29, a reflection plate 25 mounted on the cover bottom 50, a light guide plate 23 positioned above the reflection plate 25, And a plurality of optical sheets 21 that are formed on the substrate.

The LED assembly 29 is formed by mounting a plurality of LEDs 29a to the LED printed circuit board 29b so that each of the plurality of LEDs 29a is supported by a support portion 23a of the light guide plate 23, Are arranged along one side of the main (30).

In order to arrange such an LED assembly 29, a first interval A1 is required

The first interval A1 means an interval between the upper surface of the LED printed circuit board 29b and the light incident portion 23a of the light guide plate 23. The thickness of each of the plurality of LEDs 29a, And the second interval A2 corresponding to the space between each of the light incident portions 23a of the light guide plate 23 and the light incident portion 23a of the light guide plate 23.

The second gap A2 prevents the light entering portion 23a of the light guide plate 23 from contacting each of the plurality of LEDs 29a even when the light guide plate 23 expands due to heat and extends toward the LED assembly 29 , And the interval required to protect each of the plurality of LEDs 29a.

However, all the light emitted from each of the plurality of LEDs 29a of the LED assembly 29 can not be emitted to the light-incident portion 23a of the light guide plate 23 due to the second gap A2, There is a problem that the incident light efficiency is reduced.

In recent years, the liquid crystal display device has been used in a wide range of fields such as a desktop computer monitor and a wall-hanging type television as well as a portable computer, and researches on a liquid crystal display device having a wide bezel width However, it is more difficult to reduce the width A of the bezel by the second gap A2.

Accordingly, it is an object of the present invention to provide a light guide plate and a liquid crystal display device capable of minimizing a width of a bezel and allowing light emitted from each of the plurality of LEDs to be incident to the maximum.

According to an aspect of the present invention, there is provided a liquid crystal display comprising: a liquid crystal panel; A light guide plate including an LED assembly formed by mounting a plurality of LEDs on a printed circuit board and at least one light-incident portion having LED grooves for inserting the LEDs; a reflection plate positioned on a back surface of the light guide plate; And a backlight unit including a plurality of optical sheets interposed on an upper portion of the light guide plate, wherein a backside of the light guide plate has a first section in which the plurality of LEDs are positioned at a predetermined distance from the light- A second section including a plurality of first patterns formed on the inner side of the first section and including a plurality of second patterns formed on the inner side of the second section and having a uniform luminance, .

And the LED groove is a plurality of LED grooves corresponding to the plurality of LEDs.

Wherein the second region comprises a first region in which light emitted from each of the plurality of LEDs reaches and a second region in which light emitted from each of the plurality of LEDs does not reach, And the plurality of first patterns having a smaller pattern size and a larger spacing between patterns are formed in the second region as the distance from the plurality of LEDs increases.

The third region includes a third region corresponding to the second region and overlapped with light emitted from each of the plurality of LEDs, and the third region includes a plurality of second patterns having the same size and uniform density, .

And a plurality of third patterns are formed in the third section except for the third area so that a distance between the patterns is uniform and a pattern size is increased as the distance from the plurality of LEDs increases.

Wherein the light guide plate includes two light-incident portions facing each other, the first section being symmetrical with respect to a center of a second direction perpendicular to the first direction in which the plurality of LEDs are arranged, The second section, and the third section are formed.

According to another aspect of the present invention, there is provided a light guide plate for a backlight unit including a plurality of LEDs as a light source, the light guide plate including at least one light entrance portion having an LED groove for insertion of the plurality of LEDs, A second section including a first section in which a plurality of LEDs are positioned and a plurality of first patterns formed inside the first section and increasing brightness, and a second section formed inside the second section and exhibiting a uniform constant brightness And a third section including a plurality of second patterns for performing the second pattern.

As described above, according to the present invention, by forming LED grooves in the light-incident portion of the light guide plate and inserting a plurality of LEDs, all light emitted from the plurality of LEDs can be incident on the light guide plate.

As described above, since the plurality of LEDs are embedded in the light-incident portion of the light guide plate, the light-incident efficiency of the light source can be increased and the width of the bezel of the liquid crystal display device can be reduced.

1 is a cross-sectional view of a conventional lateral type liquid crystal display device.
2 is an exploded perspective view illustrating a liquid crystal display device according to a preferred embodiment of the present invention.
3 is a cross-sectional view illustrating a liquid crystal display device according to a preferred embodiment of the present invention.
4A and 4B are perspective views illustrating a light guide plate according to a preferred embodiment of the present invention.
5 is a plan view showing a back surface of a light guide plate having a plurality of LEDs inserted therein according to a preferred embodiment of the present invention.

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

FIG. 2 is an exploded perspective view illustrating a liquid crystal display device according to a preferred embodiment of the present invention, and FIG. 3 is a cross-sectional view illustrating a liquid crystal display device according to a preferred embodiment of the present invention.

2 and 3, the liquid crystal display device 100 includes a liquid crystal panel 110, a backlight unit 120, and a support main body 120 for modularizing the liquid crystal panel 110 and the backlight unit 120. [ (130), a cover bottom (150), and a top cover (140).

The liquid crystal panel 110 is a part that plays a key role in image display and is composed of a first substrate 112 and a second substrate 114 which are bonded to each other with a liquid crystal layer interposed therebetween.

Although not shown in the drawing, a plurality of gate lines and data lines cross each other on the inner surface of a first substrate 112, which is usually referred to as a lower substrate or an array substrate, on the premise of an active matrix system, pixels are defined, And a thin film transistor (TFT) is provided and connected in a one-to-one correspondence with the transparent pixel electrode formed in each pixel.

On the inner surface of the second substrate 114 called an upper substrate or a color substrate, a color filter of red (R), green (G), and blue (B) And a black matrix for covering non-display elements such as a gate line, a data line, and a thin film transistor.

The first and second polarizers 119a and 119b selectively transmit only specific light to the outer surfaces of the first and second substrates 112 and 114, respectively.

A printed circuit board 117 is connected to at least one edge of the liquid crystal panel 110 via a connection member 116 such as a flexible circuit board or a tape carrier package (TCP) To the side of the support main body 130 or to the back surface of the cover bottom 150, as shown in FIG.

When the thin film transistor selected for each gate line is turned on by the on or off signal of the gate driving circuit transmitted through the printed circuit board 117, the liquid crystal panel 110 having the above- The signal voltage is transmitted to the corresponding pixel electrode through the data line, and the alignment direction of the liquid crystal molecules is changed by the electric field between the pixel electrode and the common electrode.

On the rear surface of the liquid crystal panel 110, a backlight unit 120 is provided to supply light so that the difference in transmittance can be displayed as an image.

The backlight unit 120 includes a light source 129 disposed along one inner side surface of the cover bottom 150, a reflection plate 125 placed on the cover bottom 150, A plurality of optical sheets 123 interposed therebetween, and a plurality of optical sheets 121 interposed therebetween.

When the LED 129a is used, a plurality of LEDs 129a are spaced apart from each other by a predetermined distance to form a printed circuit board (PCB) (not shown) 129b so as to form the LED assembly 129.

Here, the printed circuit board 129b may correspond to a metal core printed circuit board having a heat dissipating function, and a heat sink (not shown) may be provided on the back surface of the metal core printed circuit board Heat generated from each of the plurality of LEDs 129a can be emitted to the outside.

The plurality of LEDs 129a of the LED assembly 129 are embedded in the light entering portion 123a of the light guide plate 123. [

Accordingly, the light emitted from each of the plurality of LEDs 129a is directly incident into the light guide plate 123, and is indirectly supplied to the liquid crystal panel 110 by using the refraction and reflection of the light guide plate 123.

The light guide plate 123 guides light emitted from each of the plurality of LEDs 129 to realize a high-quality surface light source.

The light guide plate 123 is characterized in that an LED groove 232 for inserting a plurality of LEDs 129a is formed in the light-incident portion 123a. A plurality of LEDs 129a are inserted into the LED groove 232 The light incident portion 123a of the light guide plate 123 is brought into contact with the front surface of the printed circuit board 129b. This will be described in detail later.

The plurality of LEDs 129a are buried in the light-incident portion 123a through the LED groove 232 so that light emitted from each of the plurality of LEDs 129a can be incident into the light-guide plate 123 without loss.

Accordingly, in the prior art, a first gap (see FIG. 1) is formed between the front surface of a printed circuit board (29b in FIG. 1) on which a plurality of LEDs 1), the width of the bezel including the first interval (A1 in FIG. 1) is required and the light loss occurs. However, in the present invention, a plurality of LEDs 129a (A1 in FIG. 1) can be reduced by embedding in the light entering portion 123a of the light guide plate 123, so that it is possible to prevent the light loss while having the narrower width B of the bezel.

The reflection plate 125 positioned on the back surface of the light guide plate 123 reflects the light that has passed through the back surface of the light guide plate 123 toward the liquid crystal panel 110 to improve the brightness of light.

The plurality of optical sheets 121 mounted on the upper surface of the light guide plate 123 are formed to diffuse or condense the light converted into the surface light source by the light guide plate 123 so that a more uniform surface light source is incident on the liquid crystal panel 110. [ do.

The plurality of optical sheets 121 may include a diffusion sheet for diffusing light, a prism sheet for condensing light, and a protective sheet for protecting the prism sheet and serving as an auxiliary for diffusing light.

The liquid crystal panel 110 and the backlight unit 120 are modularized through the support main 130 and the top cover 140 and the cover bottom 150 as described above.

The top cover 140 is formed in a liquid crystal panel 110 with its front surface opened so as to cover a front edge of the liquid crystal panel 110 and a side surface portion of the support main 130, So that an image can be displayed.

The support main 130 has a rectangular shape and divides the liquid crystal panel 110 and the backlight unit 120 while supporting the back edge of the liquid crystal panel 110. The support main 130 has a cover bottom 150 on which the backlight unit 120 is mounted, And the edge of the liquid crystal panel 110.

The cover bottom 150, which is the base of the backlight unit 120 and serves as a base of the entire structure of the LCD module 100, is formed into a rectangular plate shape having four sides formed by vertically bending its four edges . Here, the LED assembly 129 is disposed along the inner surface of at least one side of these four sides.

The liquid crystal panel 110 and the backlight unit 120 may include a top cover 140 covering the top edge of the liquid crystal panel 110 and a back cover 140 surrounding the back edge of the backlight unit 120, The cover main body 130 and the cover main body 130 are integrally joined to each other.

The light emitted from each of the plurality of LEDs 129a of the backlight unit 120 is incident on the inside of the light guide plate 123 and then refracted toward the liquid crystal panel 110 inside the light guide plate 123, And is supplied to the liquid crystal panel 110 while being processed into a more uniform high-quality surface light source while passing through the plurality of optical sheets 121 together with the light reflected by the liquid crystal panel.

Here, the top cover 140 may be referred to as a case top or a top case, and the support main 130 may be referred to as a guide panel or a main support or a mold frame, and the cover bottom 150 may be referred to as a bottom cover.

Hereinafter, the structure of the light-incident portion 123a of the light guide plate 123 into which a plurality of LEDs 129a according to the present invention are inserted will be described in more detail.

FIGS. 4A and 4B are perspective views illustrating a light guide plate into which a plurality of LEDs are inserted according to a preferred embodiment of the present invention, with reference to FIGS. 2 and 3. FIG.

4A and 4B, the light guide plate 123 has a rectangular shape and includes a front portion 210, a rear portion 220, four side portions 230 connecting the front portion 210 and the rear portion 220, .

Here, at least one of the four side portions 230 corresponds to a light-incident portion 123a through which light emitted from the plurality of LEDs 129a is incident.

Here, the light-incident portion 123a may be formed with an LED groove 232a into which a plurality of LEDs 129a may be inserted as shown in FIG. 4a.

The LED groove 232a is formed in a number corresponding to the number of the light-incident portions 123a provided in the light guide plate 123. [ For example, when two side portions of the four side portions correspond to the light-incident portion, two LED recesses corresponding to the two light-incident portions may be provided.

The LED groove 232a is formed to have a size corresponding to the total size of a plurality of LEDs (129a in FIGS. 2 and 3) and has a depth d1 corresponding to the thickness of each LED (129a in FIGS. 2 and 3) And may have a size and a depth d1 sufficient to ensure a tolerance margin for insertion of a plurality of LEDs (129a in FIGS. 2 and 3). At this time, the tolerance margin may include a margin against the expansion of the light guide plate 123.

A plurality of LED grooves 232b for inserting a plurality of LEDs 129a may be formed in the light-incident portion 123a as shown in FIG. 4b.

The plurality of LED recesses 232b are formed along the arrangement direction in which a plurality of LEDs (129a in FIGS. 2 and 3) are disposed, that is, the lengthwise direction of the light-incident portion 123a. And corresponds to the number and position of the LEDs.

Each of the LED grooves 232b is formed to have a size corresponding to the size of each LED (129a in FIGS. 2 and 3) and has a depth d2 corresponding to the thickness of each LED (129a in FIGS. 2 and 3) And may have a size and a depth d2 sufficient to ensure a tolerance margin for insertion of each LED (129a in FIGS. 2 and 3).

The light guide plate 123 may be made of polymethyl methacrylate (PMMA) or polymethacrylic styrene (MS) resin in which polymethyl methacrylate (PMMA) and polystyrene (PS) are mixed. have.

In addition, the light guide plate 123 may be manufactured by injection molding used for molding a specific shape.

As described above, the LED groove 232a into which a plurality of LEDs 129a can be inserted or the plurality of LED grooves 232b into which the LEDs 129a can all be inserted are formed in the light-incident portion 123a A pattern for guiding light may be formed on the back surface 220 of the light guide plate 123.

FIG. 5 is a plan view showing a rear surface of a light guide plate having a plurality of LEDs according to a preferred embodiment of the present invention, and FIG. 4A is referred to. Here, the LED groove 232a or the plurality of LED grooves 232b are formed in the light-incident portion 123a, and the pattern of the back portion 220 of the light guide plate 123 is the same.

5, light incident into the light guide plate 123 is guided to the back surface 220 of the light guide plate 123 so that a uniform surface light source can be supplied to the liquid crystal panel (110 of FIGS. 2 and 3) Is provided.

The back surface 220 of the light guide plate 123 includes a light source section L in which a plurality of LEDs 129a as a light source are positioned, a first pattern section M in which a pattern is partially formed, 2 pattern sections (N).

The light source section L is a section from the light input section 123a to a certain distance and a plurality of LEDs 129a are embedded in the light input section 123a while being spaced apart from each other along the longitudinal direction of the light entering section 123a .

The length of the light source section L may be the same as the thickness of each LED 129a or may be the same as the depth of the LED groove 232a which is larger than the thickness of each LED 129a.

Each of the plurality of LEDs 129a includes a light emitting portion 129a2 including an LED chip 129a1 which emits light substantially, an electrode lead (not shown) connected to the light emitting portion 129a2 and connected to an external power source, And a frame 129a3 that surrounds and protects the light emitting portion 129a2.

In each of the plurality of LEDs 129a, the left-right directional angle [theta] 1 in the lateral direction in which light is emitted is usually about 120 degrees.

The light source section L in which the plurality of LEDs 129a are provided is obscured by the bezel to a non-display area where no image is displayed.

The first pattern section M is a section from a light source section L where a plurality of LEDs 129a are disposed to a certain distance. When a pattern is formed in a section adjacent to the light source, only the first pattern section M As the light is concentrated, a hot spot phenomenon is generated on the screen due to the difference in brightness between the different regions, so that no pattern is conventionally formed.

However, the present invention is characterized in that a pattern is formed partly in the first pattern section (M).

The first pattern section M includes an emission region m2 that is a region where light emitted from the plurality of LEDs 129a reaches and a plurality of LEDs 129a that are regions where light emitted from the plurality of LEDs 129a does not reach And a dark region m1 between the light-receiving portions 129a and 129a. This is because the light emitted from each LED 129a spreads within a certain range of right and left directing angles [theta] 1.

A pattern is not formed in the emitting region m2 so that the light emitted from each of the plurality of LEDs 129a can spread evenly over a wide area within the light guide plate 123. [

On the other hand, the arm portion m1 is a region where light emitted from the plurality of LEDs 129a does not reach, and is provided in a triangular shape between adjacent output regions m2.

The apex angle [theta] 2 of the arm portion m1 may vary depending on the spacing between the LEDs 129a. For example, the vertex angle? 2 increases as the distance between the LEDs 129a increases, and decreases as the distance between the LEDs 129a decreases.

In the present invention, a plurality of first patterns 251 are formed in the dark region m1.

The plurality of first patterns 251 are patterns for improving darkness. As the distance from the plurality of LEDs 129a as the light source decreases, the pattern size decreases and the spacing between the patterns increases. As a result, And the density of the pattern decreases as the distance from the light source increases.

2 and 3) through the back surface of the light guide plate 123 and reflected by the liquid crystal panel (110 of FIG. 2 and FIG. 3) from the reflection plate 125 of FIGS. 2 and 3 by a plurality of first patterns 251, The dark region m1 can be maintained at a luminance similar to that of the other regions as the brightness of the dark region m1 is increased.

By controlling the density and size of the first patterns 251 formed on the arm portion m1, a hot spot phenomenon due to the dark portion m1 on the screen of the liquid crystal display device can be eliminated .

The first pattern section M may have a length of about several millimeters. The first pattern section M may vary depending on the size of the light guide plate 123, but is typically 3 mm long from the light source section L.

The second pattern section N includes sections other than the light source area L and the first pattern area M and includes a gloss area n1 in which light emitted from each of the plurality of LEDs 129a overlap.

Here, a plurality of second patterns 253 are formed in the bright region n1 to improve the brightness of the bright region compared to other regions.

 Here, the plurality of second patterns 253 is a pattern for improving the brightness, and is formed such that the pattern size and the interval between the patterns are the same, so that the uniform density can be expressed by making the pattern density constant, the hot-spot phenomenon caused by the n1 can be solved.

The bright region n1 may correspond to the dark region m1 and be symmetrical with respect to the same area.

Although not shown, a plurality of third patterns are formed in the second pattern section N except for the bright area n1, and the plurality of third patterns are formed by diffusing the light emitted from each of the plurality of LEDs 129a, .

Such a plurality of third patterns may be formed such that the distance between the patterns becomes uniform as the distance from the light source increases, but the pattern size increases. Or the distance from the light source, the size of the pattern is uniform. However, the pattern density is made smaller as the distance from the light source is reduced by forming the pattern so that the distance between the patterns becomes smaller.

The plurality of third patterns may vary the light path of the light emitted from each of the plurality of LEDs 129a so that the light is spread widely and a uniform planar light source can be realized.

The plurality of first patterns 251 described above are patterns in which the brightness of the dark region m1 is increased to match the brightness of the other regions (regions), and a plurality of second patterns 253 are formed in the bright region n1 And a plurality of third patterns are patterns in which a uniform brightness can be expressed in the second pattern section N except for the bright area n1, to be. A uniform high-quality surface light source can be displayed on the liquid crystal display screen through the first to third patterns.

On the other hand, the interval between the first to third patterns 251 and 253 (not shown) and the size of the pattern are not limited to those shown in the drawings, but may vary depending on the size of the light guide plate 123.

Each of the first to third patterns 251 and 253 (not shown) may be formed in the shape of an embossed or embossed pattern. In the drawing, the pattern is shown as a circular pattern, but not limited thereto, an elliptical pattern, a polygon pattern, a hologram pattern, and the like. The first to third patterns 251 and 253 (not shown) may be formed by a printing method or an injection method.

On the other hand, when at least two side portions of the light guide plate are the light incident portion, the pattern shape of the backlight portion of the light guide plate is different from that described above.

For example, if the light guide plate has both side portions opposed to each other, the light source portion may be symmetrical with respect to the center of the second direction perpendicular to the first direction in which the plurality of LEDs are disposed, the first pattern portion, Section is formed.

That is, a light source section in which a plurality of LEDs, which are light sources, are disposed on each of two opposing edges, a first pattern section is formed inside each of the light source sections, a second pattern section is formed inside each of the first pattern sections, .

As a result, a pattern is formed on the back surface of the light guide plate symmetrically with respect to the center in the second direction.

The embodiments of the present invention as described above are merely illustrative, and those skilled in the art can make modifications without departing from the gist of the present invention. Accordingly, the protection scope of the present invention includes modifications of the present invention within the scope of the appended claims and equivalents thereof.

110: liquid crystal panel 120: backlight unit
129: LED assembly (129a: LED, 129b: printed circuit board)
125: reflector 123: light guide plate 123a: light-incident portion
121: a plurality of optical sheets

Claims (10)

A liquid crystal panel;
A light guide plate including an LED assembly formed by mounting a plurality of LEDs on a printed circuit board and at least one light-incident portion having LED grooves for inserting the LEDs; a reflection plate positioned on a back surface of the light guide plate; And a backlight unit including a plurality of optical sheets interposed in an upper portion of the backlight unit,
The back surface of the light guide plate
A first section in which the plurality of LEDs are positioned at a predetermined distance from the light-incident section, a second section formed in the first section and including a plurality of first patterns for increasing brightness, And a third section including a plurality of second patterns formed inside the second section and exhibiting a uniform constant luminance,
The second section
A first region in which light emitted from each of the plurality of LEDs reaches, and a second region in which light emitted from each of the plurality of LEDs does not reach,
Wherein the plurality of first patterns are formed such that a pattern is not formed in the first region, a size of the pattern is decreased as the second region is further away from the plurality of LEDs, and the interval between the patterns is increased.
The method according to claim 1,
The LED groove
And a plurality of LED grooves corresponding to each of the plurality of LEDs.



delete The method according to claim 1,
The third section
And a third region corresponding to the second region and overlapping with the light emitted from each of the plurality of LEDs,
The third region
The plurality of second patterns having the same size and uniform density are formed.
5. The method of claim 4,
The third section, excluding the third area,
Wherein a plurality of third patterns are formed such that the distance between the plurality of LEDs becomes uniform as the distance from the plurality of LEDs increases.
The method according to claim 1,
The light-
Includes two light-incident portions facing each other,
On the back surface of the light guide plate
Wherein the first section, the second section and the third section are symmetrical with respect to each other about a center in a second direction perpendicular to the first direction in which the plurality of LEDs are arranged.
In a light guide plate for a backlight unit including a plurality of LEDs as a light source,
A plurality of LEDs formed in the first section and a plurality of LEDs formed in the plurality of LEDs, the LEDs being inserted into the plurality of LEDs; And a third section including a plurality of second patterns formed inside the second section and exhibiting a uniform constant luminance, wherein the second section includes a plurality of first patterns including a plurality of second patterns,
The second section
A first region in which light emitted from each of the plurality of LEDs reaches, and a second region in which light emitted from each of the plurality of LEDs does not reach,
Wherein the plurality of first patterns are formed such that a pattern is not formed in the first region, a size of the pattern is decreased as the second region is further away from the plurality of LEDs, and the spacing between the patterns is increased.


delete 8. The method of claim 7,
The third section
And a third region corresponding to the second region and overlapping with the light emitted from each of the plurality of LEDs,
The third region
And the plurality of second patterns having the same size and uniform density are formed.
10. The method of claim 9,
The third section, excluding the third area,
Wherein a plurality of third patterns are formed such that the distance between the plurality of LEDs becomes uniform as the distance from the plurality of LEDs increases.

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