KR20140089267A - Liquid crystal display device - Google Patents

Abstract

The present invention provides a liquid crystal display device comprising: a reflection plate; a light guide plate settled on an upper part of the reflection plate; an LED assembly comprising a plurality of LEDs arranged along a light entering surface of the light guide plate and outputting light towards the light entering surface and an LED FPCB, where the plurality of LEDs are mounted, is overlapped with an upper surface of one end of the light guide plate; a plurality of optical sheets settled on the light guide plate having a diffuser sheet; a liquid crystal panel settled on the plurality of optical sheets; a support main surrounding the edge of the liquid crystal panel; a cover bottom consisting of a lower surface closely contacting a rear surface of the support main and a side surface thereof, wherein a groove is formed on one surface of the LED FPCB, and the extended part of one end of the optical sheet is settled on the groove without being protruded from the LED FPCB surface.

Description

[0001] Liquid crystal display device [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device in which a hot spot defect is improved in using an LED as a light source.

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, As shown in Fig.

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 in order to display the difference in transmittance as an image. To this end, a backlight unit with a light source is disposed on the back surface of the liquid crystal panel.

The backlight unit of the liquid crystal display device is divided into a direct type and an edge type depending on the arrangement of the lamps.

In the edge type method, one or a pair of light sources has a structure in which one side of a light guide plate and two or two pairs of light sources are disposed on both sides of a light guide plate, and a direct light type structure is a structure in which several light sources are disposed under a liquid crystal panel .

In this case, the direct-type type is mainly used in a liquid crystal display device in which brightness is more important than a thickness of a screen because of its limited thickness, and the edge type that is thinner than the direct type is thicker than a notebook PC or a monitor PC It is mainly used in important liquid crystal display devices.

BACKGROUND ART In recent years, researches on thin type liquid crystal display devices have been actively conducted, and research on an edge type backlight unit has been actively conducted.

Particularly, as an edge type backlight unit, an LED light source has characteristics such as small size, low power consumption, and high reliability, and thus it is in recent trends widely used as a light source for a lightweight thin type liquid crystal display device.

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

As shown in the figure, an edge type liquid crystal display device 1 using a conventional LED 29a as a light source mainly includes a liquid crystal panel 10, a backlight unit 20, a support main body 30, 50 and a top cover 40.

The liquid crystal panel 10 is composed of first and second substrates 12 and 14 which are in contact with each other with a liquid crystal layer (not shown) interposed therebetween, And polarizing plates 19a and 19b for controlling the direction of polarization.

A backlight unit 20 is disposed behind the liquid crystal panel 10.

The backlight unit 20 includes a flexible printed circuit board (LED FPCB) 29b and LEDs 29a mounted thereon, which are overlapped with the upper surface of the light guide plate 23 along the longitudinal direction of at least one side edge of the support main body 30 A light guide plate 23 that is seated on the reflector 25 and a plurality of optical sheets 23 that are interposed between the reflectors 25 and 25, (21).

The liquid crystal panel 10 and the backlight unit 20 are covered with a top cover 40 covering the upper edge of the liquid crystal panel 10 in a state where the edge is surrounded by the support main 30 having a rectangular frame shape, And the cover bottoms 50 covering the cover main body 30 are coupled to each other through the support main body 30 to form the liquid crystal display device 1.

However, in recent years, the display device has been required to have a narrow bezel type in which the area of the display area is increased and the width of the non-display area around the display area is reduced.

Accordingly, the liquid crystal display device also realizes a narrow bezel in order to realize the narrow bezel. In order to realize the narrow bezel, the width of the non-display area is reduced to increase the brightness of the other area in the area where the light guide plate and the LED lamp face each other Hot spot defects are frequent.

The hot spot is caused by the spacing distance between the LED and the LED, and the light emitted from the LED is incident on the light guide plate due to the edge of the package due to the characteristics of the LED package. Therefore, And portions where light is not irradiated are generated.

That is, in the case of a backlight using an LED as a light source, a light diffusion distance of at least a certain size is required on the characteristics of the LED package. When the light diffusion distance is smaller than a certain size, Hot spot irregularities of alternating portions are generated.

Such hot spots can be suppressed when the non-display area has a width sufficiently larger than the light diffusion distance of the LED. However, in the case of a narrow-bezel type liquid crystal display device, The hot spot defect occurs because the width is smaller than the minimum gap required to suppress the occurrence of hot spot, that is, the light diffusion distance.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a liquid crystal display device capable of realizing a narrow bezel while suppressing the occurrence of hot spot unevenness.

According to an aspect of the present invention, there is provided a liquid crystal display comprising: a reflection plate; A light guide plate mounted on the reflection plate; A plurality of LEDs arranged along the light incident surface of the light guide plate and emitting light toward the light incident surface, LEDs FPCB arranged to overlap the upper surface of one end of the light guide plate, Assembly; A plurality of optical sheets seated on the light guide plate and including a diffusion sheet; A liquid crystal panel mounted on the plurality of optical sheets; A support main body covering an edge of the liquid crystal panel; And a cover bottom formed to be in close contact with the support main back surface and a side surface of the support bottom. The LED FPCB is provided with a groove on one surface thereof, and an extended portion of one end of the diffusion sheet is inserted into the groove, And is seated without protruding with respect to the surface.

At this time, the groove provided in the LED FPCB has a depth corresponding to the thickness of the diffusion sheet.

Wherein a width of a groove provided in the LED FPCB is larger than a width of the diffusion sheet overlapping the groove.

Further, a light shielding tape is further attached to one surface of the LED FPCB and the surface of the diffusion sheet overlapping the LED FPCB.

The other surface of the LED FPCB is further provided with an ink layer for reflecting light emitted from the plurality of LEDs.

As described above, the liquid crystal display device according to an embodiment of the present invention overlaps with the LED FPCB in which the LED FPCB overlaps with one surface of the LGP, and one end of the diffusion sheet overlaps with the LGP again, And the spot defect in the display area of the nearest portion is suppressed.

Further, the liquid crystal display device according to an embodiment of the present invention has a structure in which the LED FPCB and the diffusion sheet are not overlapped with each other, thereby improving the adhesion uniformity of the light-shielding tape. There is an effect of further suppressing hot spot defects by minimizing the area of the generated portion.

1 is a cross-sectional view of an edge-type liquid crystal display device having a backlight unit using a conventional LED as a light source.
2 is an exploded perspective view of a liquid crystal display device according to a first embodiment of the present invention.
3 is a cross-sectional view of a liquid crystal display device according to a first embodiment of the present invention.
4 is an exploded perspective view of a liquid crystal display device according to a second embodiment of the present invention;
5 is a cross-sectional view of a liquid crystal display device according to a second embodiment of the present invention

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

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

The liquid crystal display 100 according to the first embodiment of the present invention includes a liquid crystal panel 110, a backlight unit, a top cover for modularizing the liquid crystal panel 110 and the backlight unit 120 140, a support main body 130, and a cover bottom 150.

The liquid crystal panel 110 is a part that plays a key role in image display. The liquid crystal panel 110 includes a first substrate 112 (see FIG. 1) And a second substrate 114, as shown in FIG.

At this time, a plurality of gate wirings (not shown) and data wirings (not shown) cross each other on the inner surface of the first substrate 112, which is usually referred to as a lower substrate or an array substrate, And a thin film transistor (TFT) is provided in each pixel at each intersection of the gate and the data line (not shown), and is connected in a one-to-one correspondence with the transparent pixel electrode formed in each pixel have.

The inner surface of the second substrate 114, which is called an upper substrate or a color filter substrate, includes color filters of red (R), green (G), and blue (B) And a black matrix for covering non-display elements such as a gate line (not shown), a data line (not shown), and a thin film transistor (not shown).

Further, transparent common electrodes (not shown) are provided to cover them.

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

A connection member 116 such as a flexible printed circuit board (FPCB) or a tape carrier package (TCP) is provided along at least one edge of the liquid crystal panel 110 having such a configuration The printed circuit board 117 is connected to the support main body 130 so as to be suitably bent on the side or back surface of the support main body 130 during the modularization process.

When the thin film transistor (not shown) selected for each gate line is turned on by the on / off signal of the gate driving circuit, the signal voltage of the data driving circuit is applied to the corresponding pixel electrode And the alignment direction of the liquid crystal molecules in the liquid crystal layer (not shown) is changed by the electric field between the pixel electrode (not shown) and the common electrode (not shown), thereby showing a difference in transmittance.

The liquid crystal display 100 according to the first embodiment of the present invention is provided with a backlight unit 120 for supplying light from the backside of the liquid crystal display panel 100 so that the difference in transmittance represented by the liquid crystal panel 110 is externally expressed.

The backlight unit 120 includes a white or silver reflection plate 125, a light guide plate 123 mounted on the reflection plate 125, an LED assembly 129 positioned on one side or both sides of the light guide plate 123, And a plurality of optical sheets 121 interposed on the light guide plate 123.

The LED assembly 129 is disposed on one side or both sides of the light guide plate 123 so as to face a side surface of the light guide plate 123.

The LED assembly 129 includes a plurality of LEDs 128 having a predetermined spacing and an LED FPCB 190 on which the plurality of LEDs 128 are mounted.

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 optical sheet 121 on the light guide plate 123 includes a diffusion sheet 121a and at least one light condensing sheet 121b and 121c and diffuses or condenses light passing through the light guide plate 123 So that a more uniform surface light source is incident on the liquid crystal panel 110.

The liquid crystal panel 110 and the backlight unit 120 are modularized through the top cover 140, the support main body 130 and the cover bottom 150. The top cover 140 is formed on the upper surface of the liquid crystal panel 110 And a side surface of the top cover 140 is opened so as to display an image to be displayed on the liquid crystal panel 110. [

The cover bottom 150 on which the liquid crystal panel 110 and the backlight unit 120 are mounted and which is the basis for assembling the entire structure of the liquid crystal display device 100 is formed into a rectangular plate shape having a vertically bent edge portion A horizontal surface 151 closely attached to the back surface of the backlight unit 120, and a side surface 153 whose edge is vertically bent upward.

The support main body 130 having a square shape and having one side opened to cover the edges of the liquid crystal panel 110 and the backlight unit 120 is mounted on the cover bottom 150, And the cover valve 150 are connected to each other.

In this case, 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. The cover bottom 150 may be a bottom cover or a bottom cover It is also called.

One of the most characteristic structures of the liquid crystal display device 100 according to the first embodiment of the present invention having such a configuration is that the LED FPCB 190 is arranged on one side of the light guide plate 123 And is overlapped with the upper surface of the light guide plate 123 by a predetermined width.

The diffusing sheet 123a, which is one of the plurality of optical sheets 123, is formed at one end thereof with a wider width than the other optical sheets 123b and 123c, And is formed to overlap with the LED FPCB 190 on the upper surface of one side of the LED chip 123.

The flow of the LED FPCB 190 and the diffusion sheet 121a is suppressed at a portion where the LED FPCB 190 and the diffusion sheet 121a are overlapped with each other and at the same time, 185) is attached to the upper surface of the housing.

Another feature is that an ink layer 192 for guiding light emitted from the LED 128 is formed on the FPCB 200 on which the LED 128 is mounted.

The ink layer 192 formed on the surface of the LED FPCB 190 reflects the light emitted from the LED 128 in the upward direction of the LED 128 to the inside of the light guide plate 123, This ink layer 192 is formed by coating the ink using a silk screen technique.

The ink layer 192 reflects the light emitted from the LED assembly 129 and is incident on the light guide plate 123 to enhance the brightness characteristic. However, the ink layer 192 is not necessarily formed on the LED FPCB 190 May be omitted.

The liquid crystal display according to the first embodiment of the present invention has the above-described constitutional characteristic, that is, the LED FPCB 190 is overlapped with one surface of the light guide plate 123, and one end of the diffusion sheet 121a The hot spot defect in the display area of the portion closest to the LED assembly 129 is suppressed by overlapping with the LED FPCB 190 overlapping with the light guide plate 123 again.

However, in the case of the liquid crystal display device 100 according to the first embodiment of the present invention, the hot spot defect is solved to some extent, but the diffusion sheet 121a located at the lowermost one of the optical sheets 121 is called the LED FPCB The light-shielding tape 185 is protruded from the surface of the LED FPCB 190 by the thickness of the diffusion sheet 121a by overlapping the light-shielding tape 190 and the light guide plate 123, The protruding configuration increases the area of the lifted portion between the diffusion sheet 121a and the light guide plate 123, and further, the uniformity of the attachment of the light-shielding tape 185 is lowered.

Accordingly, it is possible to suppress lifting between the diffusion sheet 121a and the light guide plate 123, which is generated in the liquid crystal display device according to the first embodiment, while suppressing hot spot defects through the second embodiment of the present invention, Which can improve the adhesion uniformity of the liquid crystal display device.

FIG. 4 is an exploded perspective view of a liquid crystal display device according to a second embodiment of the present invention, and FIG. 5 is a cross-sectional view of a part of a liquid crystal display device according to a second embodiment of the present invention.

The liquid crystal display 200 according to the second embodiment of the present invention includes a liquid crystal panel 210, a backlight unit 220 including an LED assembly 229, a liquid crystal panel 210, A top cover 240 and a support main body 130 for modularizing the main body 220.

The liquid crystal panel 110 is a part that plays a key role in image display and includes a first substrate 212 and a second substrate 214 which are bonded to each other with a liquid crystal layer (not shown) therebetween, do.

At this time, a plurality of gate wirings (not shown) and data wirings (not shown) cross each other on the inner surface of the first substrate 212 to define pixels, and the gate and data wirings A thin film transistor (TFT) is provided at each of the intersections of the TFTs and the TFTs to be connected to the transparent pixel electrodes formed on the pixels in a one-to-one correspondence manner.

On the inner surface of the second substrate 214, color filters of red (R), green (G), and blue (B) colors corresponding to the respective pixels and a color filter And a black matrix (not shown) for covering non-display elements such as a data line (not shown) and a thin film transistor (not shown).

In addition, a transparent common electrode covering these elements is provided.

Meanwhile, the liquid crystal panel 210 having such a configuration can be variously modified.

Although common electrodes (not shown) are provided on the second substrate 214 in the second embodiment of the present invention, the common electrodes (not shown) may be formed on the first substrate 212.

For example, when the common electrode is provided on the first substrate 212, the liquid crystal panel 210 may be formed so as to alternate with the pixel electrodes (not shown) provided in the respective pixels. In this case, And operates in an electric-field mode.

In addition, the common electrode (not shown) may be provided on the first substrate 212 via the pixel electrode (not shown) and an insulating layer (not shown). In this case, Or a common electrode (not shown) has a plurality of openings (not shown) in the form of a bar in each pixel, thereby operating in a fringe field switching mode.

On the outer surface of the liquid crystal panel 210 having various configurations, polarizing plates 219a and 219b selectively transmit only specific light.

A printed circuit board 217 is connected to at least one edge of the liquid crystal panel 110 having such a configuration via a connection member 216 such as a flexible circuit board or a tape carrier package (TCP) So that the support main body 230 is appropriately bent and brought into contact with the side surface or the back surface of the support main body 230.

In the liquid crystal display device 200 according to the second embodiment of the present invention, a backlight unit 220 is provided for supplying light from the rear surface of the liquid crystal display panel 200 so that a difference in transmittance represented by the liquid crystal panel 110 is externally expressed .

The backlight unit 220 includes a white or silver reflection plate 225, a light guide plate 223 that is seated on the reflection plate 225, an LED assembly 229 located on one side or both sides of the light guide plate 223, And a plurality of optical sheets 121 interposed on the light guide plate 223 and including at least one diffusion sheet 221a.

The light guide plate 223 may be formed of a plastic material such as polymethylmethacrylate (PMMA) or polycarbonate (PC), which is an acrylic transparent resin, which is one of transparent materials capable of transmitting light. (Flat type).

The light guide plate 223 includes a pattern (not shown) having a specific shape on its back surface to supply a uniform surface light source. The pattern (not shown) guides the light incident into the light guide plates 223 and 123 An elliptical pattern, a polygon pattern, a hologram pattern, and the like.

 The reflection plate 225 is disposed on the back surface of the light guide plate 223 and reflects light passing through the back surface of the light guide plate 223 toward the liquid crystal panel 210 to improve the brightness of light.

The LED assembly 229 (200a, 200b) is located on one side or both sides of the light guide plate 223 so as to face a side surface of the light guide plate 223.

The LED assembly 229 includes a plurality of LEDs 228 having a predetermined spacing and an LED FPCB 290 on which the LEDs 228 are mounted.

As a characteristic feature of the liquid crystal display device 200 according to the second embodiment of the present invention, one end of the surface of the LED FPCB 290 opposite to the surface provided with the plurality of LEDs 228 is referred to as a reference A groove portion hm having a predetermined width and reduced in thickness compared to other regions is formed.

It is preferable that the depth of the groove portion hm be equal to the thickness of the diffusion sheet 221a which is extended and seated on the LED FPCB 290. The width of the groove is equal to the thickness of the diffusion sheet 221a extended and seated on the LED FPCB 290, And has a larger value than the width of the portion overlapping with the upper surface 221a.

As described above, the LED FPCB 290 is provided with a groove hm on one surface thereof to prevent hot spots due to the LEDs 228 which are spaced apart from each other. The diffusion sheet 221a does not protrude above the surface of the LED FPCB 290 with respect to the surface of the LED FPCB 290 even if one side of the LED FPCB 221a is extended and overlapped with the LED FPCB 290.

Therefore, even if the light-shielding tape 285 is attached to the overlapping portion of the LED FPCB 290 and the diffusion sheet 221a seated in the groove portion hm of the LED FPCB 290, there is no protruded portion, (285) is attached to the flat surface without protrusions, thereby improving the adhesion uniformity.

The height of the LED FPCB 290 on which the diffusion sheet 221a is mounted is reduced with respect to the surface of the light guide plate 223 so that the light guide plate 223 of the diffusion sheet 221a, The area where the lifting is generated is reduced, thereby further reducing the occurrence of hot spots.

In the liquid crystal display according to the first and second embodiments of the present invention, nine luminance measurement points are set on the line within 3 mm from the light-incident portion of the light guide plate having the LED assembly, As a result of measuring the luminance uniformity at these 18 set points, it was found that the liquid crystal display according to the first embodiment of the present invention has an average brightness uniformity of 73%. In the second embodiment of the present invention The liquid crystal display device according to the present invention has an average luminance uniformity of 78%.

Accordingly, it can be seen that the liquid crystal display according to the second embodiment of the present invention is improved by about 5% from the first embodiment in terms of luminance uniformity.

In the case of a conventional narrow bezel type liquid crystal display device (a configuration in which the LED FPCB and the diffusion sheet do not overlap), in the same method of measuring the luminance uniformity in the liquid crystal display devices according to the first and second embodiments of the present invention As a result of measuring the luminance uniformity, it was experimentally found that the luminance uniformity was less than 50%. Such a conventional narrow bezel type liquid crystal display device and the liquid crystal display device according to the first and second embodiments of the present invention, It can be understood that the liquid crystal display according to the first and second embodiments of the present invention has an effect of improving by 20% or more.

On the other hand, the diffusion sheet 221a is seated on the groove portion hm of the LED FPCB 290 as described above, and the light-shielding tape 285 is mounted on the LED FPCB 290 and the diffusion sheet 221a, In the liquid crystal display device 200 according to the second embodiment of the present invention having the corresponding structure, the reflection plate 225 is positioned on the back surface of the light guide plate 223 and passes through the back surface of the light guide plate 223 And one light is reflected toward the liquid crystal panel 210 to improve the brightness of light.

The optical sheet 121 seated on the light guide plate 223 includes at least one light collecting sheet 221b and 221c in addition to the diffusion sheet 221a. Light emitted from the light guide plate 223 And a more uniform planar light source is incident on the liquid crystal panel 210. In this case,

The diffusion sheet 221a of the optical sheet 221 further extends from one side of the optical sheets 221b and 221c to the groove hm on the upper surface of the LED FPCB 290. [

The optical sheets (121 and 221 in Fig. 3) provided in the liquid crystal display devices 100 and 200 according to the first and second embodiments of the present invention, The diffusion sheets 121a and 221a shown in Fig. 3 have a larger width than the other sheets (121b, 121c, 221b and 221c in Fig. 3) 121b, 121c, 221b, 221c of the LED FPCB 290 may be formed to overlap with the LED FPCB 290.

This configuration helps to suppress the occurrence of hot spots.

The liquid crystal panel 120 and the backlight unit 220 are modularized through the top cover 240, the support main body 230, and the cover bottom 250.

At this time, the top cover 240 is formed in a rectangular shape having a cross-section bent in a "? "Form so as to cover the upper and side edges of the liquid crystal panel 210, And is configured to display an image that is implemented in the panel 210.

The cover bottom (250), on which the liquid crystal panel (210) and the backlight unit (220) are mounted and is the basis for assembling the entire structure of the liquid crystal display device (200), has a rectangular plate shape A horizontal plane 151 closely attached to the back surface of the backlight unit 220, and a side 153 vertically bent upward.

The support main 230 having a square shape and having one side opened to cover the edges of the liquid crystal panel 210 and the backlight unit 220 is mounted on the cover bottom 250 having the above- (240) and the cover bottom (250).

An ink layer 292 for guiding light emitted from the LED 128 may be selectively formed on the LED FPCB 290 having the LED 128 mounted thereon.

The ink layer 292 formed on one surface of the LED FPCB 290 and more precisely on the LED mounting surface of the light guide plate 223 may emit light emitted upward from the LED 128, And reflects it to the inside.

The liquid crystal display device 200 according to the second embodiment of the present invention having such a configuration is characterized in that the LED FPCB 290 is overlapped with one surface of the light guide plate 223, Is overlapped with the LED FPCB (290) which overlaps with the light guide plate (223), spot defect in the display area of the nearest portion to the LED assembly (229) is suppressed, and furthermore, the LED FPCB (290) The diffusion uniformity of the light shielding tape 285 is improved and the area of the portion where the diffusion sheet 221a is lifted from the light guide plate 223 is set to be Thereby minimizing hot spot defects.

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.

200: liquid crystal display
210: a liquid crystal panel
212, 214: first and second substrates
219a, 219b: First and second polarizing plates
221: Optical sheet
221a: diffusion sheet
221b and 221c:
225: reflector
228: LED
229: LED assembly
230: Support Main
240: Top cover
250: cover bolt
285: Shading tape
290: LED FPCB
292: ink layer
hm: Groove

Claims (5)

A reflector;
A light guide plate mounted on the reflection plate;
A plurality of LEDs arranged along the light incident surface of the light guide plate and emitting light toward the light incident surface, LEDs FPCB arranged to overlap the upper surface of one end of the light guide plate, Assembly;
A plurality of optical sheets seated on the light guide plate and including a diffusion sheet;
A liquid crystal panel mounted on the plurality of optical sheets;
A support main body covering an edge of the liquid crystal panel;
A cover bottom surface formed by a bottom surface in close contact with the support main back surface and a side surface thereof;
Wherein a groove is formed on one surface of the LED FPCB and an extended portion of one end of the diffusion sheet is seated in the groove without protruding with reference to the surface of the LED FPCB. .
The method according to claim 1,
Wherein a depth of the groove provided in the LED FPCB is equal to a thickness of the diffusion sheet.
The method according to claim 1,
Wherein a width of a groove provided in the LED FPCB is larger than a width of the diffusion sheet overlapping the groove.
The method according to claim 1,
Wherein a light shielding tape is further attached to one surface of the LED FPCB and a surface of the diffusion sheet overlapping with the LED FPCB.
The method according to claim 1,
And the other surface of the LED FPCB is further provided with an ink layer that reflects light emitted from the plurality of LEDs.

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