KR20110077245A - Liquid crystal display device - Google Patents

Abstract

PURPOSE: A liquid crystal display device is provided to improve brightness and a color gamut of the liquid crystal display device using an LED as a light source. CONSTITUTION: A liquid crystal display device includes as follows. A liquid crystal panel includes an array substrate with a thin film transistor and a color filter substrate(114) which has a color filter pattern of a red, green, and blue. A backlight unit is comprised of a reflection plate located on the lower part of the liquid crystal panel, a light emitting diode arranged on the reflection plate and a plurality of optical sheet located on upper part of the light emitting diode. A color filter pattern of the red is formed by using the red pigment which red 254 pigment and red 177 is mixed.

Description

Liquid crystal display device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display, and more particularly, to an improvement in luminance and color reproducibility of a liquid crystal display using an LED as a light source.

Liquid crystal display devices (LCDs), which are used for TVs and monitors due to their high contrast ratio and are advantageous for displaying moving images, are characterized by optical anisotropy and polarization of liquid crystals. The principle of image implementation by

Such a liquid crystal display is an essential component of a liquid crystal panel bonded through a liquid crystal layer between two side-by-side substrates, and realizes a difference in transmittance by changing an arrangement direction of liquid crystal molecules with an electric field in the liquid crystal panel. 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 including a light source is disposed on the back of the liquid crystal panel.

Here, a cold cathode fluorescent lamp (CCFL), an external electrode fluorescent lamp (LED), and a light emitting diode (LED) are used as a light source of the backlight unit. .

Among them, LEDs are particularly widely used as light sources for displays with features such as small size, low power consumption, and high reliability.

1 is a cross-sectional view of a liquid crystal display device using a general LED as a light source.

As illustrated, a general liquid crystal display device includes a liquid crystal panel 10, a backlight unit 20, a support main 30, a cover bottom 50, and a top cover 40.

The liquid crystal panel 10 is a part that plays a key role in image expression and is composed of first and second substrates 12 and 14 bonded to each other with a liquid crystal layer interposed therebetween.

Although not shown in the drawings, a first substrate 12, commonly referred to as a lower substrate or an array substrate, is provided with a thin film transistor (TFT), and a second substrate 14 called an upper substrate or a color filter substrate. As an example corresponding to each pixel, a color filter pattern and a black matrix of red (R), green (G), and blue (B) colors are provided on the inner surface.

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

The backlight unit 20 includes an LED assembly 29 arranged along at least one edge length direction of the support main 30, a white or silver reflecting plate 25 seated on the cover bottom 50, and a reflecting plate ( A light guide plate 23 seated on 25 and a plurality of optical sheets 21 interposed thereon.

At this time, the LED assembly 29 is configured on one side of the light guide plate 23, a plurality of LEDs 29a for emitting white light, and the LED PCB (printed circuit board: 29b, hereinafter, PCB) is mounted on which the LED (29a) is mounted. It includes).

The LED assembly 29 is fixed in position by bonding or the like so that the light emitted from the plurality of LEDs 29a faces the light incident part of the light guide plate 23.

In addition, the liquid crystal panel 10 and the backlight unit 20 have a top cover 40 covering the top edge of the liquid crystal panel 10 with the edges surrounded by the rectangular main frame support 30, and the backlight unit 20. Cover cover 50 that covers the back of the) is respectively coupled to the front and rear is integrated through the support main 30.

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

Therefore, the light emitted from the backlight unit 20 is displayed in the form of a color image by reflecting the color combination of the color filter in the process of passing through the liquid crystal panel 10.

On the other hand, the LED (29a) used as a light source of the liquid crystal display device is composed of a large LED chip and a phosphor, and when light is emitted from the LED chip, the emitted light excites the phosphor to emit white light.

Recently, the LED (29a) has been using a lot of yellow phosphor to improve the brightness. However, when the yellow phosphor is used in this way, the luminance is increased but the color reproducibility is reduced.

Therefore, the liquid crystal display device using the LED 29a as a light source does not satisfy the color coordinate of BT.709, which is a color coordinate system representing the color reproducibility of HDTV (High Definition Television).

The present invention has been made to solve the above problems, and an object of the present invention is to improve luminance and color reproducibility of a liquid crystal display device using an LED as a light source.

In order to achieve the above object, the present invention provides a liquid crystal panel comprising an array substrate having a thin film transistor and a color filter substrate on which color filter patterns of red (R), green (G) and blue (B) are formed; ; And a backlight unit including a reflective plate positioned below the liquid crystal panel, a light emitting diode arranged on the reflective plate, and a plurality of optical sheets positioned above the light emitting diode, wherein the color filter pattern of red (R) includes: Provided is a liquid crystal display device formed by using a red (R) pigment in which a Red 254 pigment and a Red 177 pigment are mixed.

In this case, the green (G) color filter pattern is formed using a green (G) pigment in which Green 36 pigment and Yellow 150 pigment are mixed, and the blue (B) color filter pattern is blue (B) of Blue 15: 6 pigment. ) Is formed using a pigment.

The Red 254 pigment and the Red 177 pigment are mixed at a ratio of 46:54, and the Green 36 pigment and the Yellow 150 pigment are mixed at a ratio of 90:10.

The LED may include a blue LED chip and a yellow phosphor, and further include a light guide plate under the plurality of optical sheets, and the LED may be positioned to face the light incident part of the light guide plate.

In addition, the inner surface of the array substrate includes a gate and a data wiring crossing each other to define a pixel region, the thin film transistor connected to the two wires, and a pixel electrode connected to the thin film transistor. A black matrix corresponding to the gate, data wiring, and thin film transistor is formed on the inner side of the substrate, and a common electrode covering the color filter pattern and the black matrix is formed.

As described above, in the present invention, the red (R) color filter pattern of the color filter layer is formed of a red color pigment in which Red 254 pigment and Red 177 pigment are mixed in a predetermined ratio, and the green (G) color filter pattern is Green 36 pigments and Yellow 150 pigments are mixed and mixed in a predetermined ratio, and the blue (B) color filter pattern is formed with a blue color pigment consisting of Blue 15: 6 pigment, thereby using LED as a light source. There is an effect of improving the color reproducibility of the liquid crystal display device, and the effect of satisfying the color coordinate of BT.709.

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 module according to an exemplary embodiment of the present invention, and FIG. 3 is a partially exploded perspective view of the liquid crystal panel of FIG. 2.

As shown in FIG. 2, the LCD module includes a liquid crystal panel 110, a backlight unit 220, a support main 230, a cover bottom 250, and a top cover 240.

First, the liquid crystal panel 110 will be described in more detail with reference to FIG. 3, which is an exploded perspective view of the liquid crystal panel 110. On one surface of the array substrate 112, a plurality of data lines 118 and gate lines 116 vertically and horizontally cross each other. Define the area P.

The thin film transistor T is provided at the intersection of the two wirings 116 and 118 so as to be connected one-to-one with the transparent pixel electrode 124 provided in each pixel region P. FIG.

In addition, a non-display element such as a data line 118, a gate line 116, and a thin film transistor T of the array substrate 112 may be disposed on one surface of the color filter substrate 114 facing the liquid crystal layer 150 therebetween. A black matrix 132 having a lattice shape that surrounds the pixel region P is formed to expose only the pixel electrode 124 while covering.

In addition, a transparent common electrode covering the red (R), green (G), and blue (B) color filter layers 134 and all of them are sequentially arranged in order to correspond to each pixel region P in the lattice. 136.

Polarizing plates 119a and 119b for selectively transmitting only specific light are attached to the outer surfaces of the array substrate and the color filter substrate 112 and 114.

Although not clearly shown in the drawings, the upper and lower alignment layers for determining the initial molecular alignment direction of the liquid crystal are interposed between the array substrate and the color filter substrate 112 and 114 and the liquid crystal layer 150. Seal patterns (not shown) are formed along edges of both substrates 112 and 114 to prevent leakage of the liquid crystal layer 150 filled between the substrate and the color filter substrates 112 and 114.

In particular, since the dual array substrate 112 has a larger size than the color filter substrate 114, one side edge of the array substrate 112 is exposed to the outside when they are bonded to each other, and each of the plurality of data wires 118 and A plurality of data pads 122 connected to each other and a plurality of gate pads (not shown) connected to the plurality of gate wirings 116 are positioned.

In this case, the plurality of data pads 122 and the gate pads (not shown) are respectively connected to the external printed circuit board 218 through a connection member 216 such as a tape carrier package (TCP). The printed circuit board 218 is equipped with a timing controller, a gamma voltage generator, and the like, which primarily process various signal information input from an external device such as a computer to supply a signal voltage required for image display.

The printed circuit board 218 is folded and adhered to the side of the support main 230 or the back of the cover bottom 250 during the modularization process.

In addition, the connection member 216 is transferred to the image signal and the gate wiring 116 transmitted to the data wiring 118 of the liquid crystal panel 110 through the signal voltage transmitted from the printed circuit board 218 and the thin film transistor T A data driver and gate driver IC for generating and outputting a scan signal including an on / off signal) is mounted.

Accordingly, the signals for turning on / off the thin film transistor T are sequentially scanned and applied to the gate wiring 16, so that the image signal of the data wiring 118 is selected. When the image signal is transmitted to the electrode 124, the liquid crystal molecules between the array substrate and the color filter substrates 112 and 114 are driven by the electric field therebetween, and various images can be displayed by the change in the transmittance of light. .

In addition, the liquid crystal display module according to the present invention is provided with a backlight unit 220 for supplying light from the rear side of the liquid crystal panel 110 so that the difference in transmittance is expressed to the outside.

The backlight unit 220 includes an LED assembly 229, a white or silver reflector 225, a light guide plate 223 seated on the reflector 225, and a plurality of optical sheets 221 interposed thereon. Include.

The above-described LED assembly 229 is located on one side of the light guide plate 223 so as to face the light-receiving portion of the light guide plate 223, and the LED assembly 229 includes a plurality of LEDs 229a for emitting light and LEDs thereof. 229a) includes a PCB 229b mounted at regular intervals.

Here, the LED 229a is composed of an LED chip (not shown) and a phosphor (not shown) that emits large light. When light is emitted from the LED chip (not shown), the emitted light excites the phosphor (not shown). It will shine.

At this time, the LED chip (not shown) is a blue LED chip, the phosphor (not shown) is YAG (Y) aluminum (Al) garnet doped with cerium (Ce) doped with a wavelength of 530 ~ 570nm: A yellow phosphor of Ce (T ₃ Al ₅ O ₁₂ : Ce) series is used.

Here, the dominant wavelength is referred to as the wavelength of the phosphor that generates the highest luminance in each of red (R), green (G), and blue (B).

The light guide plate 223 evenly spreads the light incident from the LED 229a to the wide area of the light guide plate 223 while propagating through the light guide plate 223 by several total reflections to provide the surface light source to the liquid crystal panel 110.

The light guide plate 223 may include a pattern of a specific shape on the rear surface to supply a uniform surface light source.

The reflecting plate 225 is disposed on the rear surface of the light guide plate 223, and reflects light passing through the rear surface of the light guide plate 223 toward the liquid crystal panel 110 to improve the brightness of the light.

The plurality of optical sheets 221 formed on the light guide plate 223 include a diffusion sheet, at least one light collecting sheet, and the like, and diffuse or collect light passing through the light guide plate 223 to provide a more uniform surface light source. To be incident on (110).

The liquid crystal panel 110 and the backlight unit 220 are modularized through the top cover 240, the support main 230, and the cover bottom 250. The top cover 240 is the top and side surfaces of the liquid crystal panel 110. A rectangular frame having a cross section bent in a shape of “a” so as to cover an edge thereof is configured to open an entire surface of the top cover 240 to display an image implemented in the liquid crystal panel 110.

In addition, the liquid crystal panel 110 and the backlight unit 220 are seated, and the cover bottom 250, which is the basis for assembling the entire apparatus of the liquid crystal display device module, has a rectangular plate shape and one side edge thereof is vertically bent at a predetermined height. Configure.

A support main 230 having a rectangular frame shape seated on the cover bottom 250 and surrounding the edges of the liquid crystal panel 110 and the backlight unit 220 is combined with the top cover 240 and the cover bottom 250.

In this case, the top cover 240 may also be referred to as a case top or a top case, and the support main 230 may also be referred to as a guide panel or a main support and a mold frame, and the cover bottom 250 may be referred to as a bottom cover or a lower cover. It is also built.

Meanwhile, the liquid crystal display of the present invention uses BT 2709a including a yellow phosphor (not shown) for reducing the color reproducibility as a light source, but BT.709 is a color coordinate system showing the color reproducibility of HDTV (High Definition Television). The color coordinate of is satisfied.

This is because the pigments of red (R), green (G), and blue (B) color filter layers 134 formed on the color filter substrate 114 of the liquid crystal panel 110 are newly satisfied to satisfy the color coordinates of BT.709. It is because it mixes.

That is, the color filter layer 134 of the present invention is formed of a red (R) pigment in which a red (R) color filter pattern is mixed and blended in a ratio of Red 254 pigment and Red 177 pigment in a ratio of 46:54, and green (G) color. The filter pattern is formed of a green (G) pigment in which Green 36 pigment and Yellow 150 pigment are mixed in a ratio of 90: 10, and the blue (B) color filter pattern is a blue (B) pigment composed of Blue 15: 6 pigment. It is characterized by being formed.

This will be described in more detail with reference to the method of forming the color filter layer 134.

The color filter substrate 114 is manufactured by a method such as a pigment dispersion method, a dyeing method, an electrodeposition method, or a thermal transfer method. In general, the pigment dispersion method is widely used because of its excellent precision and reproducibility.

4A to 4D, the manufacturing method of the color filter substrate by the pigment dispersion method will be briefly described.

As shown in FIG. 4A, the first to third openings are sequentially repeated through photolithography after depositing (coating) a metal material or a black resin material on the transparent color filter substrate 114. Black Matrx 132 having (140a, 140b, 140c) is formed.

The black matrix 132 is to prevent light leakage caused by abnormal action of the liquid crystal molecules in portions other than the pixel electrode (124 of FIG. 2) on the array substrate (112 of FIG. 3).

Next, as shown in FIG. 4B, red (R), green (G), and blue colors are formed on the color filter substrate 114 on which the black matrix 132 having the first to third openings 140a, 140b, and 140c is formed. One of (B), for example, a red (R) pigment is applied to the entire surface by a spin coating method or a bar coating method to apply a red (R) color filter layer 133a. ).

Thus, after forming the red (R) color filter layer 133a on the color filter substrate 114, a mask (not shown) having a transmission region through which light passes and a blocking region to block light therethrough is shown in the color filter substrate 114. ) By exposing and developing the red (R) color filter layer 133a, and as shown in FIG. 4C, the red (R) color filter pattern 134a, which is repeated at regular intervals, is black matrixed. It is formed in the region of the first opening 140a of 132.

At this time, the red (R) pigment is composed of a red (R) pigment in which Red 254 pigment and Red 177 pigment is preferably mixed in a ratio of 46:54, wherein Red 177 pigment has a lower luminance than Red 254 pigment. Has characteristics.

Therefore, by mixing the Red 254 pigment and Red 177 pigment in a ratio of 46:54, the red (R) pigment of the present invention is to implement a deep red color (deep red color).

Table (1) below shows the color coordinates of the deep red color pigments of the present invention, and is shown in comparison with the color coordinates of the existing general red color pigments.

Condition Red Green Blue White BT.709
Nesting ratio Pigment x y Y x y Y x y Y x y Y R1 0.6362 0.3366 84.0
0 0.3014 0.6026 360.72 0.1509 0.0578 50.17 0.2849 0.2890 496.26 96.9% R2 0.6468 0.3312 80.61 0.3041 0.6026 360.72 0.1509 0.0578 50.17 0.2755 0.2878 489.1 98.9%

Table (1)

R1 is a color coordinate of a general red (R) pigment, and R2 is a color coordinate of a red (R) pigment according to an embodiment of the present invention.

Referring to Table (1), it can be seen that the color coordinates of R2 are different than R1.

This can be more easily confirmed by referring to a graph showing the spectrum of the red (R) pigment of FIG. 5A.

This change in color coordinates improves the overlap ratio of BT.709. Referring to Table (1), it can be seen that the BT.709 overlap ratio of R2 is 98.9%, which is higher than the 96.9% of the BT.709 overlap ratio of R1.

Through this, the red (R) pigment of the present invention satisfies the color coordinate of BT.709, which is the color coordinate system of the color definition of HDTV (High Definition Television), and the color reproduction is improved compared to the existing red (R) pigment. Able to know.

Here, the color gamut refers to a range of colors that can be expressed by a display device including a liquid crystal display device, which measures color coordinates and luminance of red (R), green (G), and blue (B) states, respectively. Color Reproduction can be obtained for three primary colors.

Here, the color coordinate is a scientific quantity that is usually measured in order to measure color and then distinguished from each other. The coordinate values of red (700 nm), green (546.1 nm), and blue (435.8 nm) are converted into CIE: The International Commission on Illumination, shown above the coordinate system specified in 1931.

In more detail about the color reproducibility, as shown in Figure 5b by connecting the color coordinates of each of the red (R), green (G), blue (B) determined on the color coordinate, it is possible to calculate the area of the triangle, The color gamut can be calculated by comparing the area above with the area of the NTSC color coordinates.

In other words, the color reproducibility is expressed as the ratio of the relative area when the value of the color coordinate area of NTSC is assumed to be 100.

For this reason, if the color coordinate of BT.709, which is the color coordinate system representing the color reproducibility of HDTV (High Definition Television), is embodied as the area of A, the general red (R) pigment is embodied as the area of B on the color coordinate. According to the example, the red (R) pigment is realized by the area of C.

Therefore, the BT.709 overlap ratio is the amount overlapping the area of A on the color coordinate, and it can be seen that the area of C overlaps the area of A by about 7% more than the area of B.

Through this, the red (R) pigment of the present invention more satisfies the color coordinates of BT.709, which is the color coordinate system representing the color reproduction rate of HDTV (High Definition Television), and the color reproduction rate of the existing red (R) pigment It can be seen that compared to the improvement.

Next, as shown in FIG. 4D, the process proceeds in the same manner as the method of forming the red color filter pattern 134a, and the green (G) and blue (B) pigments are applied, exposed, and developed, respectively, to be repeated at predetermined intervals. (G) and blue (B) color filter patterns 134b and 134c are formed in the second and third openings 140b and 140c between the black matrix 132 on the color filter substrate 114.

Accordingly, the color filter layer 134 is formed on the color filter substrate 114 in which red (R), green (G), and blue (B) color filter patterns 134a, 134b, and 134c are sequentially formed.

At this time, the green (G) pigment is composed of a green (G) pigment in which Green 36 pigment and Yellow 150 pigment is preferably mixed in a ratio of 90:10, and the blue (B) pigment is composed of Blue 15: 6 pigment. It is characterized by.

Here, the green (G) pigment contains a large amount of Green 36 pigment, so that the green (G) pigment also implements a deep green color.

In addition, the blue (B) pigment also implements a deep blue color.

Here, the existing blue (B) pigment is used by mixing and mixing the blue 15: 6 pigment and auxiliary pigment violet 23, violet 23 acts as a factor to decrease the contrast ratio.

Thus, as the blue (B) pigment of the present invention is composed of only the Blue 15: 6 pigment, it is to implement a deep blue color (deep blue color).

Therefore, the area on the color coordinates of the green (G) pigment and the blue (B) pigment also overlaps the color coordinate area of BT.709 more than the conventional green (G) and blue (B) pigments, and thus, The green (G) and blue (B) pigments according to the embodiment also satisfy the color coordinates of BT.709, which is the color coordinate system representing the color reproduction ratio of HDTV (High Definition Television), and the color reproduction ratio is higher than that of the existing green ( Compared to the G) and blue (B) pigments.

Table (2) below shows the color coordinates of the deep blue color pigments of the present invention, and is shown in comparison with the color coordinates of conventional blue (B) pigments.

Condition Red Green Blue White BT.709
Nesting ratio Pigment x y Y x y Y x y Y x y Y B1 0.646
8 0.3312 80.61 0.304
One 0.602
6 360.7
2 0.150
9 0.057
8 50.17 0.2755 0.2878 489.51 98.9% B2 0.643
2 0.329
4 86.45 0.294
2 0.605
0 358.4
0 0.148
7 0.005
9 48.00 0.2747 0.2877 489.33 99.3%

Table (2)

B1 is a color coordinate of a general blue (B) pigment, and B2 is a color coordinate of a blue (B) pigment according to an embodiment of the present invention.

Referring to the table (2), it can be seen that the color coordinate of B2 is different from that of B1.

This can be more easily confirmed by referring to a graph showing the spectrum of the blue (B) pigment of FIG. 6A.

This change in color coordinates improves the overlap ratio of BT.709. Referring to Table 1, it can be seen that the BT.709 overlap ratio of B2 is 99.3%, which is higher than the BT.709 overlap ratio of B1, 98.9%.

For this reason, if the color coordinate of BT.709, which is the color coordinate system representing the color reproducibility of HDTV (High Definition Television) as shown in FIG. 6B, is realized as the area of A ', a general blue (B) pigment is represented by B' on the color coordinate. It is embodied in the area, the blue (B) pigment according to the embodiment of the present invention is to be embodied in the area of C '.

Therefore, the BT.709 overlap ratio is an amount overlapping the area of A 'on the color coordinate, and it can be seen that the area of C' overlaps the area of A 'by about 2% more than the area of B'.

Through this, the blue (B) pigment of the present invention also satisfies the color coordinates of BT.709, which is the color coordinate system representing the color reproduction ratio of HDTV (High Definition Television), compared to the existing blue color pigments. You can see that it improved.

Next, as shown in FIG. 4E, indium-tin, which is a transparent conductive material on the entire surface, over the color filter layer 134 of the red (R), green (G), and blue (B) color filter patterns 134a, 134b, and 134c. An oxide (ITO) or indium-zinc-oxide (IZO) is deposited to form a common electrode 136.

In this case, an overcoat layer (not shown) may be further formed between the common electrode 136 and the color filter layer 134 to protect and planarize the color filter layer 134.

As described above, in the present invention, the red (R) pigment in which the red (R) color filter pattern 134a of the color filter layer 134 is mixed and blended in a ratio of 46:54 is preferably Red 254 pigment and Red 177 pigment. The green (G) color filter pattern 134b is formed of a green (G) pigment in which a Green 36 pigment and a Yellow 150 pigment are preferably mixed in a ratio of 90:10, and the blue (B) color filter. The pattern 134c is formed of a blue (B) pigment made of a Blue 15: 6 pigment, thereby improving color reproduction of a liquid crystal display device using an LED (129a in FIG. 3) as a light source.

This satisfies the color coordinates of BT.709, the color coordinate system representing the color reproduction ratio of HDTV (High Definition Television).

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

1 is a cross-sectional view of a liquid crystal display device using a general LED as a light source.

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

3 is an exploded perspective view of a part of a liquid crystal panel;

4A to 4E are cross-sectional views schematically showing a manufacturing method of a color filter substrate according to an exemplary embodiment of the present invention.

5A is a graph showing the spectrum of a red color pigment.

5B is a graph showing an area on a color coordinate of a red color pigment.

6A is a graph showing the spectrum of a blue color pigment.

6B is a graph showing an area on a color coordinate of a blue color pigment.

Claims (8)

A liquid crystal panel including an array substrate having a thin film transistor and a color filter substrate on which color filter patterns of red (R), green (G), and blue (B) are formed; A backlight unit comprising a reflector plate positioned below the liquid crystal panel, a light emitting diode arranged on the reflecting plate, and a plurality of optical sheets positioned on the light emitting diode. Wherein the color filter pattern of red (R) is formed using a red (R) pigment in which Red 254 pigment and Red 177 pigment are mixed. The method of claim 1, The green (G) color filter pattern is formed using a green (G) pigment in which Green 36 pigment and Yellow 150 pigment are mixed. The method of claim 1, The blue (B) color filter pattern is formed using a blue (B) pigment of Blue 15: 6 pigment. The method of claim 1, The Red 254 pigment and Red 177 pigment is mixed in a ratio of 46:54. The method of claim 2, Wherein the Green 36 pigment and Yellow 150 pigment are mixed in a ratio of 90:10. The method of claim 1, The LED includes a blue LED chip and a yellow phosphor. The method of claim 1, And a light guide plate beneath the plurality of optical sheets, wherein the LED is positioned to face the light incident part of the light guide plate. The method of claim 1, On the inner side of the array substrate, A gate and data wiring crossing each other to define a pixel region, the thin film transistor connected to the two wirings, and a pixel electrode connected to the thin film transistor are formed. On the inner side of the color filter substrate, And a black matrix corresponding to the gate, data wiring, and thin film transistor, and a common electrode covering the color filter pattern and the black matrix.

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