KR20140075355A - Liquid crystal display device - Google Patents

Abstract

The present invention relates to a liquid crystal display device and, more particularly, to a liquid crystal display device having a narrow bezel. An end part of a liquid crystal panel is mounted on a guide panel to match with an end part of the guide panel and a light guide plate is provided between a backlight unit and the liquid crystal panel; thereby the narrow bezel can be implemented, and a light can be provided to the edge side of the liquid crystal panel mounted on the upper back of a back guide panel. Through this, a display area of the liquid crystal display device can be enlarged, and the display quality of the liquid crystal display device can be improved.

Description

[0001] Liquid crystal display device [0002]

The present invention relates to a liquid crystal display, and more particularly to a liquid crystal display having a narrow 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 having a light source is disposed on the back surface of the liquid crystal panel.

The backlight unit uses a cold cathode fluorescent lamp (CCFL), an external electrode fluorescent lamp, and a light emitting diode (LED) as a light source.

In particular, LEDs are widely used as light sources for displays, having characteristics such as small size, low power consumption, and high reliability.

Meanwhile, the general backlight unit is divided into a direct type and an edge type depending on the arrangement of the lamps. In the edge type, one or a pair of light sources is divided into one side of the light guide plate and two or two pairs The light source has a structure in which the light sources are disposed on both side portions of the light guide plate, and the direct light type structure has a structure in which several light sources are disposed under the liquid crystal panel.

Here, the direct type type is mainly used in a liquid crystal display device in which brightness is more important than thickness in view of thinness, and an edge type in which a light weight and thin type can be compared with a direct type type is used for a notebook PC or a monitor PC And is mainly used in a liquid crystal display device in which thickness is important.

1 is a cross-sectional view of a liquid crystal display including a backlight unit of a general edge type using an LED as a light source.

As shown in the figure, a liquid crystal display device including a backlight unit 20 of a general edge type includes a liquid crystal panel 10, a backlight unit 20, a guide panel 30, a cover bottom 50, 40).

The liquid crystal panel 10 is constituted by first and second substrates 12 and 14 which are in contact with each other with a liquid crystal layer interposed therebetween, which plays a key role in image display.

The backlight unit 20 is provided behind the liquid crystal panel 10.

The backlight unit 20 includes an LED assembly 29 arranged along the longitudinal direction of at least one edge of the guide panel 30 and composed of a PCB 29b on which a plurality of LEDs 29a and LEDs 29a are mounted, A reflective plate 25 of white or silver color resting on the reflective plate 50, a light guide plate 23 resting on the reflective plate 25 and an optical sheet 21 located thereon.

The liquid crystal panel 10 and the backlight unit 20 are covered with a top cover 40 covering the top edge of the liquid crystal panel 10 with the edges thereof being surrounded by a rectangular guide panel 30, The cover bottoms 50 are integrally joined to each other through the guide panel 30.

And reference numerals 19a and 19b denote polarizers attached to the front and back surfaces of the liquid crystal panel 10 to control the polarization direction of light, respectively.

At this time, the LED assembly 29 is disposed on one side of the light guide plate 23, and the light is distributed to the entire surface using the light guide plate 23 to supply the surface light source to the liquid crystal panel 10.

On the other hand, in recent years, such a liquid crystal display device has been widely used as a portable computer, a desktop computer monitor, and a wall-mounted television, and researches to have a massive weight and volume with a large display area It is actively proceeding.

Particularly, in recent years, a liquid crystal display device has been demanded for a liquid crystal display device having a narrow bezel in which a liquid crystal display device is lightweight and thin, a display area is wide, and a bezel area, which is a non-display area other than the display area, .

For this purpose, in order to maximize the display area by matching the end of the guide panel 30 with the starting point of the display area, the edge of the liquid crystal panel 10 located above the guide panel 30 is moved from the backlight unit 20 The provided light is intercepted by the guide panel 30 and an area in which an image is not normally realized occurs.

SUMMARY OF THE INVENTION It is a first object of the present invention to provide a liquid crystal display device having a lightweight, thin and narrow bezel.

A second object of the present invention is to enlarge the display area of the liquid crystal panel. It is a third object of the present invention to prevent the problem of deterioration of the display quality of the liquid crystal display device.

According to an aspect of the present invention, there is provided a backlight unit including a light guide plate, a backlight unit including an LED assembly disposed along the light incident surface of the light guide plate, A guide panel including a vertical portion covering a side surface of the backlight unit and a horizontal portion protruding inward from the vertical portion; A light guide plate having an edge supported by the horizontal portion of the guide panel; And an edge of the light guiding plate is supported by an adhesive pad. The ends of the liquid crystal panel and the light guiding plate coincide with the ends of the guide panel.

At this time, the light guide plate has fine patterns formed on its back surface, and the fine patterns are arranged adjacent to the back surface of the light guide plate corresponding to the longitudinal direction of the light guide plate, Prisms.

The prism shape is formed by first and second inclined surfaces, and the first inclined surface is formed to be inclined by 0 to 45 degrees with respect to the normal normal to the light guide plate, and the second inclined surface is formed with reference to the normal line 45 to 85 degrees, and the fine patterns are symmetrical with respect to the center of the light guide plate.

The fine pattern has a height of 15 to 500 mu m, a width of 15 to 500 mu m, and the fine pattern has irregular height and width.

Also, the light guide plate has a haze characteristic, the light guide plate has a refractive index of 1.3 to 1.7, and the liquid crystal panel is spaced apart from the light guide plate by a predetermined distance.

The edge of the light guide plate is attached and fixed to the horizontal portion through an optical clear adhesive, and a cover bottom is provided on a back surface of the backlight unit. The cover bottom is engaged with the guide panel do.

As described above, according to the present invention, the end of the liquid crystal panel is seated on the guide panel so as to be aligned with the end of the guide panel, and the light guide plate is further provided between the backlight unit and the liquid crystal panel. And it is also possible to provide light to the edge side of the liquid crystal panel which is seated on the guide panel.

Thereby, the display area of the liquid crystal display device can be widened, and the display quality of the liquid crystal display device can be improved.

1 is a cross-sectional view of a liquid crystal display including a backlight unit of a general edge type using an LED as a light source.
2 is an exploded perspective view of a liquid crystal display device according to an embodiment of the present invention.
3 is a cross-sectional view schematically showing the modularized cross-section of Fig.
4 is a cross-sectional view schematically showing the progress of light of a liquid crystal display device according to an embodiment of the present invention.
5A to 5C are cross-sectional views schematically showing the structure of a light guide plate according to an embodiment of the present invention.
6A to 6C are photographs for comparing display areas of a liquid crystal display device according to an embodiment of the present invention.

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

2 is an exploded perspective view of a liquid crystal display device according to an embodiment of the present invention.

1, the liquid crystal display device includes a liquid crystal panel 110, a backlight unit 120, a guide panel 130, a cover bottom 150, and a light guide plate 200.

First of all, the liquid crystal panel 110 plays a key role in image display, and includes first and second substrates 112 and 114 which are bonded to each other with a liquid crystal layer interposed therebetween .

At this time, a plurality of gate lines and data lines intersect with each other on the inner surface of the first substrate 112, which is usually referred to as a lower substrate or an array substrate, although not clearly shown in the figure, And a thin film transistor (TFT) is provided at each of the intersections, and is connected in a one-to-one correspondence with the transparent pixel electrodes formed in the respective pixels.

On the inner surface of the second substrate 114 called an upper substrate or a color filter substrate, color filters 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. In addition, a transparent common electrode covering these elements is provided.

Although not clearly shown in the drawing, an alignment film for determining the initial alignment direction of the liquid crystal is interposed at the boundary between the two substrates 112 and 114 of the liquid crystal panel 110 and the liquid crystal layer, and a liquid crystal layer A seal pattern is formed along edges of both the substrates 112 and 114 to prevent leakage of the substrate.

At this time, polarizers (not shown) are attached to the outer surfaces of the first and second substrates 112 and 114, respectively.

A backlight unit 120 for supplying light to the back surface of the liquid crystal panel 110 is provided so that a difference in transmittance represented by the liquid crystal panel 110 is externally manifested.

The backlight unit 120 includes an LED assembly 129 arranged along the longitudinal direction of at least one edge of the guide panel 130, a white or silver reflective plate 125, and a light guide plate 123 And an optical sheet 121 interposed therebetween.

The LED assembly 129 described above is a light source of the backlight unit 120 and is disposed at one side of the light guide plate 123 so as to face the light incident surface of the light guide plate 123. The LED assembly 129 includes a plurality of LEDs 129a, And a PCB 129b on which a plurality of LEDs 129a are mounted with a predetermined spacing therebetween.

The plurality of LEDs 129a emit light having colors of red (R), green (G), and blue (B) toward the front of the light guide plate 123, and the plurality of RGB LEDs 129a ) Can be turned on at once to realize white light by color mixing.

In particular, in recent years, a blue LED 129a including a blue LED chip having excellent luminous efficiency and brightness has been used for improving the luminous efficiency and brightness, and a phosphor such as yttrium aluminum garnet (YAG: Ce) doped with cerium, A blue LED 129a made of a yellow phosphor is used.

The blue light emitted from the LED 129a is mixed with the yellow light transmitted through the phosphor and emitted by the fluorescent material, thereby realizing white light.

The light guide plate 123 to which the light emitted from the plurality of LEDs 129a is incident is formed so that the light incident from the LED 129a is uniformly spread over a wide area of the light guide plate 123 while traveling in the light guide plate 123, And provides a surface light source to the liquid crystal panel 110.

At this time, the light guide plate 123 includes a pattern of a specific pattern on its back surface in order to supply a uniform surface light source. In order to guide light incident into the light guide plate 123, the pattern may include an elliptical pattern, A polygon pattern, a hologram pattern, and the like.

The reflection plate 125 is disposed on the back surface of the light guide plate 123 and reflects light passing 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 on the light guide plate 123 include a diffusion sheet and at least one light collecting sheet and diffuse or condense light passing through the light guide plate 123 to form a more uniform surface Allow the light source to enter.

Here, the characteristic construction of the present invention is that the light guide plate 200 is further provided on the upper part of the backlight unit 120, more precisely on the optical sheet 121.

The light guide plate 200 includes a plurality of fine patterns 210 for guiding light on one surface of the optical sheet 121 and diffuses and diffuses the light passing through the optical sheet 121 by refraction So that the light is guided to the liquid crystal panel 110 located above the guide panel 130.

The liquid crystal display device according to the present invention is configured to align the start point of the display area of the liquid crystal panel 110 with the end of the guide panel 130 to realize a narrow bezel, It is possible to provide light to the side of the edge of the liquid crystal panel 110, and to substantially widen the display area of the liquid crystal display device.

Let me take a closer look at this later.

The liquid crystal panel 110 and the backlight unit 120 and the light guide plate 200 are modularized through the guide panel 130 and the cover bottom 150. The liquid crystal panel 110 and the backlight unit 120, The cover bottom 150, on which the plate 200 is mounted and is the basis for assembling the entire structure of the liquid crystal display device, is composed of a horizontal plane and an edge portion whose edge is vertically bent.

A rectangular guide panel 130 mounted on the cover bottom 150 and covering the edge of the backlight unit 120 is coupled with the cover bottom 150.

Here, the guide panel 130 has a rectangular frame shape that is bent in a "A" shape in cross section so as to cover the upper surface of the LED assembly 129 and the upper edge of the light guide plate 123, surrounding the backlight unit 120.

The light guide plate 200 is attached and fixed on the guide panel 130 through the adhesive material 220 such as a double-sided tape (see FIG. 3) The liquid crystal panel 110 is attached and fixed to the upper portion through the adhesive pad 115 (see FIG. 3), so that the liquid crystal panel 110, the backlight unit 120, and the light guide plate 200 are integrally modularized.

At this time, the ends of the light guide plate 200 and the liquid crystal panel 110 are aligned with the ends of the guide panel 130.

Accordingly, the liquid crystal display of the present invention realizes a narrow bezel in which a display area is wide and a bezel area which is a non-display area other than the display area is formed as small as possible.

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

The liquid crystal display according to the embodiment of the present invention has a structure in which a top cover (not shown) is removed, and a light cover, a thin bezel, and a narrow bezel of a liquid crystal display device are possible through the removal of a top cover It has an effect that it can be simplified.

Further, the elimination of the top cover (not shown) made of a metal material can reduce the process cost.

The liquid crystal display according to the embodiment of the present invention can realize a narrow bezel by placing the end of the liquid crystal panel 110 on the guide panel 130 so as to be aligned with the end of the guide panel 130, The light guide plate 200 is further provided between the unit 120 and the liquid crystal panel 110 to provide light to the edge side of the liquid crystal panel 110 which is seated on the guide panel 130. [

Accordingly, the display area of the liquid crystal display device can be widened, and the display quality of the liquid crystal display device can be improved.

Since the characteristic configuration according to the embodiment of the present invention can be more easily expressed through the sectional structure, the liquid crystal display according to the embodiment of the present invention will be described in more detail with reference to the sectional configuration thereof.

FIG. 3 is a cross-sectional view schematically showing a section of FIG. 1 modularized, and FIG. 4 is a cross-sectional view schematically showing the progress of light of a liquid crystal display according to an embodiment of the present invention.

An LED assembly 129 including a reflection plate 125, a light guide plate 123, a PCB 129b on which the LED 129a and the LED 129a are mounted, and a light guide plate 123 on the light guide plate 123, 121 are stacked to form a backlight unit 120. [

A liquid crystal panel 110 in which a liquid crystal layer (not shown) is interposed between the first and second substrates 112 and 114 and the first and second substrates 112 and 114 are disposed on the backlight unit 120, And 114 are attached with polarizing plates 119a and 119b selectively transmitting only specific light.

Here, the backlight unit 120 is surrounded by the guide panel 130, and the cover bottom 150 is coupled to the backside thereof.

The guide panel 130 includes a vertical portion 131 that covers the side surface of the backlight unit 120 and a vertical portion 131 that protrudes inwardly of the vertical portion 131 to cover the upper edge of the LED assembly 129 and the upper edge of the light guide plate 123, And has a rectangular frame shape whose cross section is bent in the " a " shape.

The light guide plate 200 is fixed to the upper portion of the horizontal portion 133 of the guide panel 130 through the adhesive material 220 to support the edges.

The light guide plate 200 may be made of a plastic material such as polymethylmethacrylate (PMMA), which is one of acrylic transparent resins that can transmit light, or a plastic material such as polycarbonate (PC) And a polyethylene terephthalate (PET) series.

On the rear surface of the light guide plate 200, a plurality of fine patterns 210 for guiding the high-quality processed light through the backlight unit 120 are formed.

The fine patterns 210 are formed in a plurality of prism shapes that are arranged adjacent to each other across the back surface of the light guide plate 200 corresponding to the longitudinal direction of the light incidence surface of the light guide plate 123,

The fine pattern 210 has first and second inclined surfaces 211a and 211b which are inclined at a predetermined angle from the vertexes and the first inclined surface 211a is approximately And the second inclined surface 211b may be formed to be inclined by 45 to 85 degrees with respect to the normal line.

The fine pattern 210 is preferably formed to have a width w of 15 to 500 μm and to have a height h of 15 to 500 μm.

The light guide plate 200 can control the refraction angle of the light by the fine pattern 210.

That is, by the fine pattern 210 As the light guide plate 200  By refracting the incident light in an asymmetrical direction Condensed  At a more oblique angle of light To be spread  can do. Thereby, the light is dispersed to prevent the light from being partially concentrated.

In this case, the fine pattern 210 may be formed on the entire rear surface of the light guide plate 200. However, the fine pattern 210 formed on the back surface of the light guide plate 200, So that they are formed at a predetermined distance from the end.

That is, the light guide plate 200 mounted on the upper portion of the horizontal portion 133 of the guide panel 130 is attached to the horizontal portion 133 of the guide panel 130 through the adhesive material 220 such as a double- The edge of the light guide plate 200 attached and fixed through the horizontal portion 133 and the adhesive material 220 prevents the fine pattern 210 from being formed.

Accordingly, the light guide plate 200 can be more stably attached and fixed on the horizontal portion 133 of the guide panel 130. [

At this time, it is preferable that the adhesive material 220 does not restrict the light guide area when the entire light guide plate 200 guides the light by using an optical clear adhesive for optical purposes.

An adhesive pad 115 is formed between the liquid crystal panel 110 and the light guide plate 200 for the purpose of supporting the liquid crystal panel 110 on the upper part of the light guide plate 200.

The adhesive pad 115 is made of an adhesive material such as a double-sided tape to fix the liquid crystal panel 110 to the light guide plate 200.

At this time, the bonding pad 115 is formed to have a predetermined thickness, and the liquid crystal panel 110 is spaced apart from the light guide plate 200 by a predetermined distance.

The light guide plate 200 and the liquid crystal panel 110 are positioned so that the ends thereof coincide with the ends of the guide panel 130. This will result in the implementation of a narrow bezel.

That is, the liquid crystal display of the present invention can realize a narrow bezel by placing the end of the liquid crystal panel 110 on the guide panel 130 so as to be aligned with the end of the guide panel 130, The light guide plate 200 is provided between the liquid crystal panel 110 and the liquid crystal panel 110 to provide light to the edge side of the liquid crystal panel 110 that is seated on the guide panel 130.

Accordingly, the display area of the liquid crystal display device can be widened, and the display quality of the liquid crystal display device can be improved.

4, the light emitted from the LED 129a of the LED assembly 129 is processed into high-quality light through the light guide plate 123 and the optical sheet 121, The light is uniformly incident on the entire area of the liquid crystal panel 110 by diffracting light and diffusing and scattering light during the process of transmitting the light guide plate 200. [

That is, the light guide plate 200 diffuses and scatters the light transmitted through the backlight unit 120 by refraction, and thereby the light guide plate 200 has a larger area than the surface light source realized through the backlight unit 120 by the light guide plate 200 Thereby providing a uniform planar light source over the entire area of the liquid crystal panel 110. [0050] FIG.

Particularly, since the light guide plate 200 is positioned on the upper side of the guide panel 130, the light guide plate 200 is positioned above the guide panel 130 and uniformly transmits light even toward the edge of the liquid crystal panel 110, .

Accordingly, the display area of the liquid crystal display device can be widened and the display quality of the liquid crystal display device can be improved.

5A to 5C are cross-sectional views schematically showing the structure of a light guide plate according to an embodiment of the present invention.

As shown in the drawing, the light guide plate 200 is formed with a fine pattern 210 on its rear surface. The fine pattern 210 may be integrated with the light guide plate 200 as shown in FIG. 5A, The light guide plate 200 may be formed by injection molding used for molding a specific shape or may be formed by imprinting.

Alternatively, as shown in FIG. 5B, the film 230 on which the fine pattern 210 is formed may be attached to the back surface of the light guide plate 200.

5C, the fine patterns 210 may be formed such that the fine patterns 210 on both sides of the light guide plate 200 are symmetrical with respect to the center of the light guide plate 200.

The fine patterns 200 may be formed by inclining the first and second inclined surfaces 211a and 211b at the same angle with each other and the height of the fine pattern 210 The width (w in Fig. 4) may be irregularly formed to further enhance the light refraction effect.

In addition, the light guide plate 200 may have a haze characteristic.

The haze characteristic is a phenomenon in which, when light passes through a transparent material, light diffuses depending on the intrinsic properties of the material other than reflection or absorption depending on the type of material, and an opaque blurred image appears. The desired brightness and viewing angle can be achieved.

That is, when the haze value is 30% or less, the light diffusion rate is low and the viewing angle becomes narrow. When the haze value is 90% or more, the light transmittance is low and the luminance is low.

Here, the haze value of the light guide plate 200 may include a diffusion component such as a bead. The beads (not shown) may refract light incident on the light guide plate to change the light path have. The light guide plate 200 of the present invention may be formed to have a refractive index of 1.3 to 1.7 so that the light transmitted through the light guide plate 200 is totally reflected at the boundary of the light guide plate 200.

That is, as the light guide plate 200 and the liquid crystal panel 110 are spaced apart from each other by a predetermined distance, the light transmitted through the light guide plate 200 travels from a medium having a high refractive index to a medium having a low refractive index, The plate 200 has a refractive index of 1.3 to 1.7 and the refractive index of air in the spacing space between the light guide plate 200 and the liquid crystal panel 110 is 1. Thus the light transmitted through the light guide plate 200 has a refractive index And then proceeds to a medium having a small refractive index in a large medium.

Here, in the medium having a large refractive index, the light is totally reflected in the progress of light to a small medium.

Therefore, the light transmitted through the light guide plate 200 is refracted at a critical angle or more from the slope of the light guide plate 200, which is a boundary of the medium having a different refractive index, and the refraction effect of light can be further improved.

6A to 6C are photographs for comparing display areas of a liquid crystal display device according to an embodiment of the present invention.

6A shows a liquid crystal display device having a narrow bezel having a constant width at the four edges of the display area, FIG. 6B shows a liquid crystal display device having a narrow bezel, FIG. 6C is a cross- Showing a liquid crystal display device.

Here, comparing FIGS. 6B and 6C illustrating the same narrow bezel, FIG. 6B can realize a narrow bezel, but it can be confirmed that a normal image can not be realized at the edge of the display area.

On the contrary, FIG. 6C according to the embodiment of the present invention can realize a narrow bezel and realize a uniform image as a whole in the display area.

That is, in the liquid crystal display of the present invention, the narrow bezel can be realized by placing the end of the liquid crystal panel on the guide panel so as to coincide with the end of the guide panel, and further the light guide plate is further provided between the backlight unit and the liquid crystal panel It is possible to provide light up to the side of the edge of the liquid crystal panel that is seated on the upper portion of the guide panel, thereby widening the display area of the liquid crystal display device and improving the display quality of the liquid crystal display device.

The present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the spirit of the present invention.

110: liquid crystal panel (112, 114: first and second substrates, 119a, 119b: polarizer)
115: Adhesive pad
121: optical sheet, 123: light guide plate
130: guide panel 131 (vertical portion, 133: horizontal portion)
150: cover bolt
200: light guide plate
210: fine patterns 211a and 211b (first and second inclined surfaces)
220: Adhesive material

Claims (11)

A backlight unit including a light guide plate and an LED assembly positioned along the light incident surface of the light guide plate;
A guide panel including a vertical portion covering a side surface of the backlight unit and a horizontal portion protruding inward from the vertical portion;
A light guide plate having an edge supported by the horizontal portion of the guide panel;
And a liquid crystal panel having an edge supported by an adhesive pad on an upper portion of the light guide plate,
Wherein an end of the liquid crystal panel and the light guide plate coincide with an end of the guide panel.
The method according to claim 1,
Wherein the light guide plate has a fine pattern formed on a rear surface thereof.
3. The method of claim 2,
Wherein the fine pattern is formed in a plurality of prism shapes in which an obtuse angle and a valley are repeated in a transverse plane by being arranged adjacent to a rear surface of the light guide plate corresponding to a longitudinal direction of the light entrance surface of the light guide plate.
The method of claim 3,
The prism shape is formed by first and second inclined surfaces. The first inclined surface is formed by being inclined by 0 to 45 degrees with respect to a normal normal to the light guide plate. The second inclined surface is formed by 45 ~ And the liquid crystal display device is formed by inclining the liquid crystal display panel by 85 degrees.
5. The method of claim 4,
Wherein the fine patterns are symmetrical with respect to a center of the light guide plate.
The method according to claim 1,
Wherein the fine pattern has a height of 15 to 500 mu m and a width of 15 to 500 mu m.
The method according to claim 1,
Wherein the fine pattern is irregularly formed in height and width.
The method according to claim 1,
Wherein the light guide plate has a haze characteristic.
The method according to claim 1,
Wherein the light guide plate has a refractive index of 1.3 to 1.7, and the liquid crystal panel is spaced apart from the light guide plate by a predetermined distance.
The method according to claim 1,
And an edge of the light guide plate is attached and fixed to the horizontal portion through an optical clear adhesive for optical.
The method according to claim 1,
Wherein a cover bottom is provided on a back surface of the backlight unit, and the cover bottom is engaged with the guide panel.

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