KR101885929B1 - Backlight unit and liquid crystal display device having the same - Google Patents

Abstract

The present invention relates to a liquid crystal display device having a backlight unit. In order to achieve the above object, the backlight unit according to the present invention includes a plurality of white light sources selectively driven according to ambient brightness, And at least one second light source unit including a plurality of light sources different in color from the white light source; A light guide plate disposed so as to be spaced apart from the first and second light source portions and to transmit light emitted from the first and second light source portions in the upward direction; A plurality of optical sheets arranged on the light guide plate; A guide panel disposed above the first and second light sources and supporting the liquid crystal panel; And a lower cover in which the first and second light source units and the light guide plate are housed.

Description

BACKLIGHT UNIT AND LIQUID CRYSTAL DISPLAY DEVICE HAVING THE SAME [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display (LCD), and more particularly, to a backlight unit and a liquid crystal display having the same.

Of the many flat panel display devices developed so far, liquid crystal display devices are widely used in various fields ranging from notebooks, monitors, televisions, spacecrafts and aircrafts.

Liquid crystal display devices applied to these various application fields are roughly divided into a liquid crystal panel, a driving circuit portion, and a backlight unit.

Here, the liquid crystal panel functions to display an image by adjusting the amount of transmitted light, and the driving circuit unit applies a signal to the liquid crystal panel to control various signals transmitted from the driving system to control the signals. do.

In addition, the backlight unit is used as a light control apparatus for uniformly irradiating light to the entire liquid crystal panel. The mounting of the backlight is inefficient in terms of thickness, weight, and power consumption, and much research is still being conducted.

Since such a liquid crystal display device is not a self-luminous display device, a light source such as a backlight is required.

There are two types of backlight units for liquid crystal display devices, namely direct-type and edge-type.

An edge type backlight unit is provided with a fluorescent lamp on the outer surface of a flat plate. Light is incident on the entire surface of the liquid crystal panel using a transparent light guide plate from a fluorescent lamp. On the other hand, since the backlight unit of the edge type uses a light guide plate, the thickness of the backlight unit is relatively small.

A direct-type backlight unit is a method of directly illuminating the entire surface of a liquid crystal panel by placing a light source on the back surface of the liquid crystal panel. It is possible to increase the brightness by arranging a plurality of light sources in comparison with the edge type, There are advantages.

However, in the case of the edge type, there is a disadvantage in that the light weight is heavier than the direct-type backlight unit due to the use of the light guide plate, and the light efficiency of the backlight unit is lowered due to the absorption and disappearance of light from the light guide plate. On the other hand, in the direct type, the light efficiency is better than the edge type, but it is pointed out that the high power consumption and heat generation due to the use of a large number of lamps are disadvantageous.

In addition, since the light guide plate does not exist between the lamp and the optical sheet, the direct type has a certain distance between the lamp and the optical lamp, thereby increasing the thickness of the backlight unit.

Such liquid crystal display devices include a light source such as a backlight, optical sheets for improving light efficiency by causing light from a light source in the direction of a liquid crystal panel, light guide plates as light paths for directing light from the light source toward the liquid crystal display panel , And cases for supporting and securing them are needed.

To this end, the liquid crystal display devices are assembled to the case by stacking the light source, the optical sheet, the light guide plate, and the like on the back surface of the liquid crystal panel.

Among these direct-type and edge-type backlight units, a liquid crystal display device having a conventional edge type backlight unit will be described with reference to FIGS. 1 and 2. FIG.

1 is a schematic cross-sectional view of a liquid crystal display device having a backlight unit according to the related art.

2 is a schematic plan view of a white LED and a backlight unit in a liquid crystal display device having a backlight unit according to the related art.

As shown in FIG. 1, a liquid crystal display device having a backlight unit according to the related art includes: a liquid crystal panel 10 in which an image is implemented; A guide panel 30 supporting an edge portion of the liquid crystal panel 10, a light source portion 20 provided at a lower portion of the liquid crystal panel 10, A light guide plate 26 for guiding the light incident from the light guide plate 20 toward the liquid crystal panel 10, a reflection sheet 24 disposed on the back surface of the light guide plate 26, A light source housing 22 surrounding the light source unit 20 and a lower cover 32 housing the light source unit 20 and the reflective sheet 24 and the light guide plate 26 and the optical sheet 11, (Not shown in FIG. 2, refer to 50 in FIG. 2).

The liquid crystal panel 10 includes a color filter substrate 13, an array substrate 15 and a liquid crystal layer (not shown) formed therebetween. An upper polarizing sheet 14a is formed on the color filter substrate 13, And a lower polarizing sheet 14b is attached to the rear surface of the array substrate 15. [

The top case 34 is fastened to the top edge of the liquid crystal panel 10 and the guide panel 30 to be wrapped.

Referring to FIG. 2, the light source unit 20 includes a plurality of LED elements 16 and an LED substrate 18 on which the LED elements 16 are mounted.

Here, the plurality of LED elements 16 are composed of a white LED element for emitting light of one color. The white LED elements are coated with a yellow fluorescent material on the LED chip, .

The plurality of optical sheets 11 includes a lower diffusion sheet 11a for diffusing the light emitted from the light guide plate 26 to the entire area and a light guide plate for guiding the progress angle of the light diffused by the diffusion sheet 11a, Two prism sheets 11b and 11c that vertically raise the prism sheet 10 and an upper diffusion sheet 11d that diffuses light passed through the two prism sheets 11b and 11c.

The reflective sheet 24 reflects light incident through the back surface of the light guide plate 26 toward the light guide plate 26 to reduce light loss.

The light source 20, the reflective sheet 24, the light guide plate 26, the optical sheet 11, and the like are accommodated in the lower cover 32.

However, according to the related art backlight unit having the above-described configuration, since a plurality of LED elements used as a light source employs one kind of white light source, brightness can be adjusted only according to the surrounding environment. In other words, the luminance is lowered by lowering the LED current in the room, and the luminance is increased by increasing the current in the outdoor environment.

Therefore, it is difficult to maintain the transmittance of the panel at a certain level or more because there is a need to have a basic color representation capability. For example, to achieve a color reproduction rate of 70%, a certain level of cell transmission should be set.

Therefore, according to the backlight unit according to the related art, since only one light source, which is a white LED, is used, luminance and color characteristics are determined according to the light source, so there are many restrictions on controlling the color and brightness according to the surrounding environment .

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a white light source and a plurality of different color light sources, A backlight unit capable of achieving an optimal color by selectively driving a light source of a different color from a white light source and a liquid crystal display device having the backlight unit.

According to an aspect of the present invention, there is provided a backlight unit including at least one first light source unit including a plurality of white light sources selectively driven according to ambient brightness, and at least one light source unit including a plurality of light sources different in color from the white light source, One second light source unit; A light guide plate disposed so as to be spaced apart from the first and second light source portions and to transmit light emitted from the first and second light source portions in the upward direction; A plurality of optical sheets arranged on the light guide plate; A guide panel disposed above the first and second light sources and supporting the liquid crystal panel; And a lower cover in which the first and second light sources and the light guide plate are housed.

According to an aspect of the present invention, there is provided a liquid crystal display device including a backlight unit. At least one first light source unit including a plurality of white light sources selectively driven according to ambient brightness, and at least one second light source unit including a plurality of light sources different in color from the white light source; A light guide plate disposed so as to be spaced apart from the first and second light source portions and to transmit light emitted from the first and second light source portions in the upward direction; A plurality of optical sheets arranged on the light guide plate; A guide panel disposed above the first and second light sources and supporting the liquid crystal panel; And a lower cover in which the first and second light sources and the light guide plate are housed.

The backlight unit and the liquid crystal display device having the same according to the present invention have the following effects.

According to the backlight unit and the liquid crystal display device having the same according to the present invention, a plurality of white light sources and a plurality of different color light sources are provided instead of using only one white light source, ) Can optimize the brightness by driving a white light source to optimize the luminance by driving a light source of different color, for example RG (Red-Green) LED when the surroundings are dark .

Therefore, according to the present invention, a plurality of white light sources and a plurality of different color light sources are provided instead of using only one white light source as in the prior art, and a light source of a different color from the white light source is selectively driven according to the surrounding brightness, It is possible to realize an optimal color.

1 is a schematic cross-sectional view of a liquid crystal display device having a backlight unit according to the related art.
2 is a schematic plan view of a white LED and a backlight unit in a liquid crystal display device having a backlight unit according to the related art.
3 is a schematic exploded perspective view of a liquid crystal display device having a backlight unit according to an embodiment of the present invention.
4 is a schematic cross-sectional view of a liquid crystal display device having a backlight unit according to an embodiment of the present invention.
5 is a schematic plan view of a plurality of white LEDs and a plurality of different color LEDs and a backlight unit in a liquid crystal display device having a backlight unit according to an embodiment of the present invention.
FIG. 6 is a simulation graph showing brightness and color of a liquid crystal display device having a backlight unit according to an exemplary embodiment of the present invention, in which a plurality of white LEDs and a plurality of different color LEDs are provided.
7 is a schematic plan view of a plurality of white LEDs and a plurality of different color LEDs and a backlight unit in a liquid crystal display device having a backlight unit according to another embodiment of the present invention.
8 is a schematic plan view of a plurality of white LEDs and a plurality of different color LEDs and a backlight unit in a liquid crystal display device having a backlight unit according to another embodiment of the present invention.

Hereinafter, a liquid crystal display device having a backlight unit according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

3 is a schematic exploded perspective view of a liquid crystal display device having a backlight unit according to an embodiment of the present invention.

4 is a schematic cross-sectional view of a liquid crystal display device having a backlight unit according to an embodiment of the present invention.

5 is a schematic plan view of a plurality of white LEDs and a plurality of different color LEDs and a backlight unit in a liquid crystal display device having a backlight unit according to an embodiment of the present invention.

As shown in FIGS. 3 and 4, a liquid crystal display device having a backlight unit according to the present invention includes: a liquid crystal panel 106 that implements an image; A guide panel 130 on which the edges of the liquid crystal panel 106 are seated and supported and a first light source unit 130 disposed on both sides of the lower portion of the liquid crystal panel 106 and including a plurality of white LEDs 116, A second light source 140 configured by a plurality of different color LEDs 120 and a plurality of different color LEDs 146 and a light guide plate 130 for guiding light incident from the first and second light sources 120 and 140 to the liquid crystal panel A reflective sheet 124 disposed on the back surface of the light guide plate 126; an optical sheet 114 laminated on the light guide plate 126; And a backlight unit 150 including a lower cover 132 in which the reflective sheet 118 and the light guide plate 126 and the optical sheet 114 are housed.

Here, the guide panel 130 is made of a molding material, and a locking portion (not shown) is formed on an inner upper edge of the guide panel 130 so that the edge portion of the liquid crystal panel 106 is seated and supported.

The first and second light sources 120 and 140 and the light source housings 122 and 162 surrounding the first and second light sources 120 and 140 are disposed under the guide panel 130, The light guide plate 126 is disposed adjacent to the first and second light source units 120 and 140.

The first light source unit 120 includes a plurality of white LEDs 116 serving as white light and an LED substrate 118 having the white LEDs 116 mounted thereon.

The second light source 140 may include a plurality of RG-LEDs 146 having a different color from a white light source, for example, RG (Red-Green) color, and LED substrates 148 ). In this case, an RGB-LED or a Quantum Dot LED may be used in addition to the RG-LED as an LED of a different color from the white light source. Here, the RG LED is an LED in which red and green phosphors are applied to a blue chip, and RGB LEDs are red chips, green chips, and blue LED (blue chip), and QD LED is a quantum dot LED.

A first light source part 120 composed of a plurality of white LEDs 116 as the white light source and a plurality of RG-LEDs 146 having a red-green color different from the white light source, (140) are disposed at positions corresponding to each other, for example, adjacent to both side surfaces of the light guide plate.

Further, the light guide plate 116 serves to advance the light incident from the first and second light source units 120 and 140 toward the liquid crystal panel 106. In particular, the light guide plate 116 provides a light path so that light generated from the first and second light source units 120 and 140 spreads over the entire lower surface of the liquid crystal panel 106. The light guide plate 116 is mainly made of poly methyl methacrylate (PMMA).

The first and second light source units 120 and 140 and the light source housings 122 and 162 are disposed on both sides of the light guide plate 116, that is, on a light incident surface (not shown), and are used as a light source of the liquid crystal panel 106 .

The light generated from the first and second light source units 120 and 140 is incident on the light guide plate 116 through a light incident surface (not shown) formed on both sides of the light guide plate 116.

The light source housings 122 and 162 are formed to surround the first and second light sources 120 and 140 and the light generated from the first and second light sources 120 and 140 may be incident on the light guide plate 116 And is reflected toward the light incident surface formed on both side surfaces.

The liquid crystal panel 106 includes an upper substrate 103 and a lower substrate 105. The liquid crystal is injected between the upper substrate 103 and the lower substrate 105 of the liquid crystal panel 106, And a spacer (not shown) for maintaining a constant distance between the upper substrate 103 and the lower substrate 105.

Although not shown in the drawing, a color filter, a common electrode, a black matrix, and the like are formed on the upper substrate 103 of the liquid crystal panel 106. Although not shown in the figure, signal wirings such as data wirings and gate wirings are formed on the lower substrate 105 of the liquid crystal panel 106, and thin film transistors (TFTs) are formed on the intersections of the data wirings and the gate wirings. : TFT) is formed.

The thin film transistor switches the data signal to be transmitted from the data line to the liquid crystal cell in response to the scan signal (or gate pulse) from the gate line.

A pixel electrode is formed in a pixel region between the data line and the gate line.

In addition, a signal line pad region (not shown) is formed on one side of the liquid crystal panel 106, to which data lines and gate lines are connected. In the pad region, a driver driving integrated circuit (Tape Carrier Package) 108 on which the tape carrier package 110 is mounted. The tape carrier package 108 supplies a data signal to the data lines from the driver driving integrated circuit 110 and supplies a scan signal to the gate lines.

An upper polarizing sheet 104a is attached to the upper substrate 103 of the liquid crystal panel 106 and a lower polarizing sheet 104b is attached to the lower surface of the lower substrate 105. [

The top case 134 is formed in the shape of a rectangular band having a flat portion and a side portion bent at right angles and is fastened to the edge portion of the liquid crystal panel 106 and the guide panel 130 to be wrapped.

The lower cover 132 houses the first and second light sources 120 and 140, the reflective sheet 124, the light guide plate 126, and the optical sheet 114, An FPCB substrate (Flexible Printed Circuit Board) (not shown) is attached, and a buyer system (not shown) is fastened to the center of the outer surface.

The reflective sheet 124 reflects the light incident on the reflective sheet 124 to the light guide plate 126 through the back surface of the light guide plate 126 to reduce light loss. That is, the light emitted from the first and second light source units 120 is vertically caused to improve light efficiency.

For this purpose, a progressive angle of the light diffused by the lower diffusion sheet 114a and the lower diffusion sheet 114a diffusing the light emitted from the light guide plate 126 to the entire area is raised perpendicularly to the liquid crystal panel 106 Prism sheets 114b and 114c and an upper diffusion sheet 114d for diffusing light transmitted through the two prism sheets 114b and 114c. Accordingly, the light emitted from the light guide plate 126 is incident on the liquid crystal panel 106 via the plurality of optical sheets 114a, 114b, 114c, and 114d.

According to the backlight unit of the present invention and the liquid crystal display device having the same, the light source for emitting light to the liquid crystal panel 106 is not limited to using only one white LED light source, And a second light source unit 140 composed of a plurality of LEDs 146 of different colors, for example, an RG-LED 146,

Among the first and second light source units 120 and 140 configured as described above, the first light source unit 120 including a plurality of white LEDs 116 is driven to optimize brightness when the surroundings are bright (i.e., outdoors).

In order to optimize the color saturation when the surroundings are dark (i.e., indoors) or when moving images are implemented, the first light source unit 120 composed of the plurality of white LEDs 116 is not driven, For example, a plurality of RG-LEDs 146. The RG-

FIG. 6 is a simulation graph showing brightness and color of a liquid crystal display device having a backlight unit according to an exemplary embodiment of the present invention, in which a plurality of white LEDs and a plurality of different color LEDs are provided.

As shown in FIG. 6, when the first light source unit 120 composed of a plurality of white LEDs 116 is driven when the surroundings are bright (i.e., outdoors), CG is about 50% It can be seen that the second light source 140 having a different color from the white light, for example, a plurality of RG-LEDs 146, is applied at a level of about 70%.

That is, in general, when the color reproduction rate is high, the transmittance of the panel is lowered, so that the luminance is lowered. Therefore, when the surroundings are bright, a light source capable of raising the luminance rather than increasing the color reproduction rate is selected, and a light source capable of increasing the color reproduction rate is used in order to view a relatively dark or colorful color image or photograph.

Therefore, according to the backlight unit and the liquid crystal display device having the same according to the present invention, a plurality of white LEDs 116 and a plurality of LEDs 146 of different colors can be provided without using only one white LED, When the surroundings are bright (that is, outdoors), a plurality of white LEDs 116 are selectively driven to optimize brightness. When the surroundings are dark (that is, indoors) or when moving images are implemented, light sources of different colors, By selectively driving the RG-LED 146, the color tone can be optimized.

Therefore, according to the present invention, a plurality of white light sources and a plurality of different color light sources are provided instead of using only one white light source as in the prior art, and a light source of a different color from the white light source is selectively driven according to the ambient brightness, It is possible to realize an optimal color.

A liquid crystal display device having a backlight unit according to another embodiment of the present invention will be described with reference to FIG.

7 is a schematic plan view of a plurality of white LEDs and a plurality of different color LEDs and a backlight unit in a liquid crystal display device having a backlight unit according to another embodiment of the present invention.

Here, in the liquid crystal display device having the backlight unit according to another embodiment of the present invention, two first light source units including a plurality of white LEDs 216 are disposed on both sides of the backlight unit 250 corresponding to each other, Except for arranging two second light source portions composed of a plurality of RG-LEDs 246 of different colors from the white LEDs on the other side of the backlight unit 250 on the other side of the backlight unit 250, Is the same as that of the liquid crystal display device having the backlight unit according to the second embodiment.

 Referring to FIG. 7, a liquid crystal display device having a backlight unit according to another embodiment of the present invention includes two first light source units (not shown) each including a plurality of white LEDs 216, (Not shown) on both sides of the light guide plate (not shown), that is, on the left and right sides.

In addition, two second light sources (not shown) composed of a plurality of RG-LEDs 246 of a different color from the white LEDs 216 are disposed on the other side of the backlight unit 250, (Not shown) on the upper and lower sides of a light guide plate (not shown) as a side surface.

Therefore, according to the backlight unit and the liquid crystal display device having the same according to another embodiment of the present invention, instead of using only one white LED as before, two first light source units (not shown) Are arranged on both sides of the backlight unit corresponding to each other, and two second light source units (not shown) composed of a plurality of RG-LEDs 246 of a different color from the white LEDs are disposed on both sides of the backlight unit 250 (Not shown) composed of a plurality of white LEDs 216 when the periphery is bright (that is, outdoors) by arranging the first light source unit (not shown) (Not shown) composed of light sources of different colors, for example, a plurality of RG-LEDs 246 when the surroundings are dark (i.e., indoors) or when moving images are implemented, .

A liquid crystal display device having a backlight unit according to another embodiment of the present invention will be described with reference to FIG.

8 is a schematic plan view of a plurality of white LEDs and a plurality of different color LEDs and a backlight unit in a liquid crystal display device having a backlight unit according to another embodiment of the present invention.

Here, a liquid crystal display device having a backlight unit according to another embodiment of the present invention includes a plurality of white LEDs 316 and a plurality of RG-LEDs 346 of a different color from the white LEDs, The liquid crystal display device having the backlight unit according to the embodiment of the present invention is the same as that of the liquid crystal display device having the backlight unit according to the embodiment of the present invention.

 Referring to FIG. 8, a liquid crystal display device having a backlight unit according to another embodiment of the present invention includes a backlight unit 350, a plurality of light sources (not shown) on one side of a light guide plate (not shown) And a plurality of RG-LEDs 346 of different colors from the white LED 316 are disposed on one side of the backlight unit 350, that is, on one side of the light guide plate (not shown) (Not shown).

The plurality of RG-LEDs 346 constituting the light source unit (not shown) and the RG-LEDs 346 having a different color from the white LEDs are arranged such that the white LEDs 316 and the RG- Or a plurality of white LEDs 316 and a plurality of RG-LEDs 346 are disposed adjacent to each other.

Therefore, according to the backlight unit and the liquid crystal display device having the same according to yet another embodiment of the present invention, a plurality of white LEDs 316 and a plurality of colors different from the white LEDs The light source unit (not shown) composed of the RG-LED 346 of the backlight unit 350 is disposed adjacent to one side of the backlight unit 350, that is, one side of the light guide plate (not shown) (For example, indoor) or a moving image, a light source of a different color, for example, a plurality of RG-LEDs 346 ) Can be selectively driven to optimize the color.

As described above, according to the backlight unit and the liquid crystal display device having the same according to the present invention, a plurality of white light sources and a plurality of different color light sources are provided instead of using only one white light source, (Ie, outdoors), a white light source is driven to optimize the luminance, and when the surroundings are dark (that is, indoors) or when a moving picture is implemented, a different color light source, for example, a red- .

Therefore, according to the present invention, a plurality of white light sources and a plurality of different color light sources are provided instead of using only one white light source as in the prior art, and a light source of a different color from the white light source is selectively driven according to the surrounding brightness, It is possible to realize an optimal color.

106: liquid crystal panel 104: polarizing sheet
114: optical sheet 116: white LED
118, 148: LED substrate 120: first light source part
124: reflective sheet 126: light guide plate
130: Guide panel 132: Lower cover
134: top case 140: second light source part
146: RG-LED 150: Backlight unit
P: Display area

Claims (14)

At least one first light source unit including a plurality of white light sources selectively driven according to ambient brightness, and at least one second light source unit including a plurality of light sources different in color from the white light source;
A light guide plate disposed so as to be spaced apart from the first and second light source portions and to transmit light emitted from the first and second light source portions in the upward direction;
A plurality of optical sheets arranged on the light guide plate;
A guide panel disposed above the first and second light sources and supporting the liquid crystal panel; And
And a lower cover in which the first and second light sources and the light guide plate are housed,
Wherein the first light source unit includes a plurality of white LEDs and the second light source unit includes any one of a plurality of RG-LEDs, an RGB-LED, and a quantum dot (QD)
Wherein the first light source unit is selectively driven when the ambient brightness has a value equal to or higher than the setting illuminance and the second light source unit is selectively driven when the ambient brightness has a value less than the setting illuminance or when the moving image is implemented. delete delete The backlight unit according to claim 1, wherein the first light source unit and the second light source unit are disposed adjacent to light incident surfaces on both sides of the light guide plate corresponding to each other. The light guide plate according to claim 1, wherein the two first light source portions are disposed adjacent to the light incident surface corresponding to the light guide plate on both sides, and the second light source portions having two different colors are adjacent to the light incident surface corresponding to the other side of the light guide plate And the backlight unit. The backlight unit according to claim 1, wherein the first light source unit and the second light source unit are disposed adjacent to the light incident surface on one side of the light guide plate. The backlight unit according to claim 6, wherein the white LEDs constituting the first light source unit and the LEDs of different colors constituting the second light source unit are alternately arranged. A liquid crystal panel in which a screen is implemented;
At least one first light source unit including a plurality of white light sources selectively driven according to ambient brightness, and at least one second light source unit including a plurality of light sources different in color from the white light source;
A light guide plate disposed so as to be spaced apart from the first and second light source portions and to transmit light emitted from the first and second light source portions in the upward direction;
A plurality of optical sheets arranged on the light guide plate;
A guide panel disposed above the first and second light sources and supporting the liquid crystal panel; And
And a lower cover in which the first and second light sources and the light guide plate are housed,
Wherein the first light source unit includes a plurality of white LEDs and the second light source unit includes any one of a plurality of RG-LEDs, an RGB-LED, and a quantum dot (QD)
The first light source unit may be selectively driven when the ambient brightness has a value equal to or higher than the predetermined illumination level and the second light source unit may have a backlight unit having the ambient brightness less than the predetermined illumination level or selectively driven when the moving image is implemented A liquid crystal display device. delete delete The liquid crystal display device according to claim 8, wherein the first light source unit and the second light source unit are disposed adjacent to the light incident surface on both sides of the light guide plate corresponding to each other. The light guide plate according to claim 8, wherein the two first light source portions are disposed adjacent to the light incident surface corresponding to the light guide plate on both sides, and the second light source portions of two different colors are adjacent to the light incident surface corresponding to the other side of the light guide plate The liquid crystal display device comprising: a backlight unit; The liquid crystal display device according to claim 8, wherein the first light source unit and the second light source unit are disposed adjacent to the light incident surface on one side of the light guide plate. The liquid crystal display device according to claim 13, wherein the white LEDs constituting the first light source unit and the LEDs of different colors constituting the second light source unit are alternately arranged.

Images