KR101946263B1 - Liquid crystal display device - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display (LCD), and more particularly, to improvement in brightness and color gamut of a liquid crystal display device using an LED as a light source.
A feature of the present invention is that the red (R) color filter pattern of the color filter layer is formed of red (R) pigment mixed with Red 254 pigment and Red 177 pigment in a ratio of 50:50, and the green (G) (B) color filter pattern was formed of a mixture of Blue 15: 6 pigment and Violet Dye pigment in a ratio of 87:13 in a ratio of 80:20, (B) pigment, and the LED as the light source is formed of a Y_silicate + R fluorescent material (not shown) mixed with a blue LED chip (not shown) and a silicate type yellow fluorescent material and a red fluorescent material, And the color reproducibility of the liquid crystal display device can be improved.
Accordingly, the color coordinate system of BT.709, which is a color coordinate system indicating the color reproduction ratio of HDTV (High Definition Television), is satisfied.

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 (LCD), and more particularly, to improvement in brightness and color gamut of a liquid crystal display device 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, And the like.

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

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

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

In particular, LEDs are widely used as light sources for displays, having characteristics 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 shown, a typical 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 constituted by first and second substrates 12 and 14 which are in contact with each other with a liquid crystal layer interposed therebetween, which plays a key role in image display.

Although not shown in the drawings, a thin film transistor (TFT) is provided on a first substrate 12, which is usually called a lower substrate or an array substrate, and a second substrate 14 called an upper substrate or a color filter substrate On the inner surface, for example, a color filter pattern of red (R), green (G), and blue (B) colors and a black matrix are provided.

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

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

The LED assembly 29 is formed on one side of the light guide plate 23 and includes a plurality of LEDs 29a for emitting white light and an LED PCB 29b for mounting a plurality of LEDs 29a, Quot;).

The LED assembly 29 is fixed in position by an adhesive or the like so that the light emitted from the plurality of LEDs 29a faces the light-incoming portion of the light guide plate 23. [

The liquid crystal panel 10 and the backlight unit 20 are covered with a top cover 40 and a backlight unit 20 which surround the top edge of the liquid crystal panel 10 in a state in which the edge is surrounded by the support main body 30 having a rectangular- And the cover bottom 50 covering the back surface of the cover main body 30 are joined to each other through the support main body 30.

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

Accordingly, 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 pattern in the process of passing through the liquid crystal panel 10. [

The LED 29a used as a light source of the liquid crystal display device is composed of an LED chip emitting light and a phosphor. When light is emitted from the LED chip, the emitted light excites the phosphor to emit white light.

The LED 29a has recently been using RG phosphors mixed with a red phosphor and a green phosphor in order to improve luminance.

However, the liquid crystal display device using the LED 29a using the RG fluorescent material as the light source has a problem that the luminance is increased but the color reproduction rate is reduced.

That is, the color reproduction rate realized when the white light emitted from the LED 29a using the RG fluorescent material passes through the color filter patterns of the red (R), green (G) and blue (B) colors of the liquid crystal panel 10 And the color coordinates of BT.709, which is a color coordinate system indicating the color reproduction ratio of HDTV (High Definition Television), are not satisfied.

In particular, the transmittance at a wavelength range of 480 to 580 nm is low, and the color recall ratio deviates much from the color coordinates of BT.709.

It is an object of the present invention to improve the brightness and color gamut 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 color filter comprising a red color filter pattern formed through a red pigment comprising Red 254 pigment and Red 177 pigment, a green color filter pattern comprising Green 58 pigment and Yellow 138 pigment A liquid crystal panel including a green color filter pattern formed through a green pigment and a color filter substrate having a blue color filter pattern formed through a blue pigment composed of a Blue 15: 6 pigment and a Violet Dye pigment; A LED disposed on the lower surface of the liquid crystal panel, an LED disposed on the reflection plate, the LED including a blue LED chip, a silicate type yellow phosphor, and a red phosphor; And a backlight unit made of an optical sheet that is made of an optical sheet.

At this time, the red pigment is mixed at a ratio of 50:50, the green pigment is mixed at a ratio of 80:20, the blue pigment is mixed at a ratio of 87:13, and the silicate type yellow Yellow) The phosphor is composed of M2SiO4: Eu2 + (M = Ca, Sr, Ba, Zn ....).

The red phosphor is made of CaSiN ₂ : Eu ²⁺ or Sr (Ba) Si ₅ N ₈ : Eu ²⁺ , and further includes a light guide plate under the optical sheet, As shown in FIG.

A gate electrode and a data line crossing each other and defining a pixel region are formed on the inner surface of the array substrate. The thin film transistor connected to the two lines and the pixel electrode connected to the thin film transistor are formed. A black matrix corresponding to the gate, the data wiring and the thin film transistor, and a common electrode covering the color filter pattern and the black matrix are formed on the inner side of the gate electrode.

As described above, the red (R) color filter pattern of the color filter layer according to the present invention is formed of red (R) pigment mixed with Red 254 pigment and Red 177 pigment in a ratio of 50:50, The color filter pattern was formed of a green (G) pigment mixed with a Green 58 pigment and a Yellow 138 pigment in a ratio of 80:20, and a blue (B) color filter pattern was formed with a blue 15: 6 pigment and a Violet Dye pigment in a ratio of 87:13 (B) pigment mixed with a red phosphor and a Y_silicate + R phosphor (not shown) mixed with a blue LED chip (not shown) and a silicate type yellow phosphor and a red phosphor to form an LED as a light source , High brightness can be realized, and color reproduction ratio of the liquid crystal display device can be improved.

This has the effect of satisfying the color coordinate system of BT.709, which is the color coordinate system indicating the color reproduction ratio of HDTV (High Definition Television).

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 device according to an embodiment of the present invention.
3 is a partially exploded perspective view of the liquid crystal panel of Fig.
4 is a graph showing a spectrum of an LED including an RG phosphor and a Y_silicate + R phosphor according to an embodiment of the present invention.

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

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

As shown, the liquid crystal display device includes a liquid crystal panel 110, a backlight unit 220, a support main body 230, a cover bottom 250, and a top cover 240.

3, which is a partially exploded perspective view of the liquid crystal panel 110, a plurality of data lines 118 and a plurality of gate lines 116 are vertically and horizontally crossed on one surface of an array substrate 112, And defines an area P.

A thin film transistor T is provided at the intersection of these two wirings 116 and 118 and is connected in a one-to-one correspondence with the transparent pixel electrode 124 provided in each pixel region P.

A data line 118 and a gate line 116 of the array substrate 112 and a non-display element such as a thin film transistor T are formed on one surface of the color filter substrate 114 facing the liquid crystal layer 150, Shaped black matrix 132 that covers the pixel region P so as to expose only the pixel electrode 124 while covering the pixel electrode 124. [

A color filter layer 134 of red (R), green (G), and blue (B), and a transparent common electrode 134 covering all of the color filter layers 134 are sequentially and repeatedly arranged in correspondence to the pixel regions P in the lattices. (136).

The red color filter pattern of the red (R), green (G) and blue (B) color filter layers 134 of the present invention is obtained by mixing Red 254 pigment and Red 177 pigment in a ratio of 50:50 And the green (G) color filter pattern is formed of a green (G) pigment mixed with a green 58 pigment and a yellow 138 at a ratio of 80:20.

The blue (B) color filter pattern is also characterized in that the blue 15: 6 pigment and the Violet Dye pigment are formed of a blue (B) pigment mixed at a ratio of 87:13.

Thus, the liquid crystal display of the present invention can realize high luminance. Let me take a closer look at this later.

On the outer surfaces of the array substrate 112 and the color filter substrate 114, polarizers 119a and 119b for selectively transmitting only specific light are attached.

Although not clearly shown in the figure, the upper and lower alignment films for determining the initial alignment direction of the liquid crystal are interposed at the boundary between the array substrate 112 and the color filter substrate 114 and the liquid crystal layer 150, A seal pattern (not shown) is formed along the edges of both substrates 112 and 114 to prevent leakage of the liquid crystal layer 150 filled between the array substrate 112 and the color filter substrate 114.

At this time, the array substrate 112 has a size larger than that of the color filter substrate 114, and one side edge of the array substrate 112 is exposed to the outside at the time of adhering them, A plurality of connected data pads 122 and a plurality of gate pads (not shown) connected to the plurality of gate lines 116 are located.

The plurality of data pads 122 and gate pads (not shown) are connected to an external printed circuit board 218 via a connection member 216 such as a tape carrier package (TCP) The circuit board 218 is mounted with a timing controller, a gamma voltage generator, and the like that processes various kinds of signal information input from an external device such as a computer and supplies signal voltages necessary for image display.

The printed circuit board 218 is brought into close contact with the side of the support main body 230 or the backside of the cover bottom 250 during the modularization process.

An image signal transmitted to the data line 118 of the liquid crystal panel 110 and a gate line 116 are transmitted to the connection member 216 through the signal voltage transmitted from the printed circuit board 218, And a gate driver IC for generating and outputting a scan signal including an on / off signal of an on / off switch (not shown).

A signal for on / off of the thin film transistor T is sequentially scanned by the gate wiring 16 so that the image signal of the data wiring 118 is applied to the pixel of the selected pixel region P When an 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 due to the change of light transmittance.

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

The backlight unit 220 includes an LED assembly 229, a white or silver reflective plate 225, a light guide plate 223 resting on the reflective plate 225, and an optical sheet 221 interposed therebetween .

The LED assembly 229 is disposed at one side of the light guide plate 223 so as to face the light incident portion of the light guide plate 223. The LED assembly 229 includes a plurality of LEDs 229a for emitting light, 229a are spaced apart from each other by a predetermined distance.

The LED 229a includes an LED chip (not shown) and a phosphor (not shown) that emits light. When light is emitted from an LED chip (not shown), the emitted light excites a phosphor Light is emitted.

The LED 229a is formed of a Y_silicate + R phosphor (not shown) in which a blue LED chip (not shown) and a silicate type yellow phosphor and a red phosphor are mixed to improve brightness wherein the yellow phosphor is a silicate (silicate) type of M ₂ SiO _4: consists of ^{Eu 2 + (M = Ca,} Sr, Ba, Zn ...) phosphor, a red phosphor CaSiN _2: Eu ²⁺ or Sr ( Ba) Si ₅ N ₈ : Eu ^{2 +} phosphor.

Here, a silicate type yellow phosphor emits light having a peak intensity in a wavelength range of about 540 to 590 nm, and a red phosphor emits light having a peak intensity in a wavelength range of about 590 to 690 nm Release.

Here, the LED including the Y_silicate + R phosphor is a white light mixed with a blue color of a wavelength band of 430 to 480 nm, a red color of a wavelength band of 645 to 655 nm, and a green color of a wavelength band of 520 to 540 nm In particular, the main peak of the green color has a wavelength of 536 nm.

Therefore, the liquid crystal display of the present invention more satisfies the color coordinate of BT.709, which is the color coordinate system in which the color reproduction rate realized by the image shows the color reproduction rate of HDTV (High Definition Television). Let me take a closer look at this later.

The light guiding plate 223 uniformly spreads the light incident from the LED 229a to the wide area of the light guide plate 223 through the light guide plate 223 by total reflection to provide a surface light source to the liquid crystal panel 110. [

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

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 110 to further improve the brightness of light.

The plurality of optical sheets 221 formed on the light guide plate 223 include a diffusion sheet and at least one light condensing sheet and the like, and the light that has passed through the light guide plate 223 is diffused or condensed, (110).

The liquid crystal panel 110 and the backlight unit 220 are modularized through the top cover 230, the support main 240 and the cover bottom 250. The liquid crystal panel 110 and the backlight unit 220 The support main body 240 has a square tee shape.

The cover bottom 250 provides a horizontal plane 251 on which the backlight unit 220 including the liquid crystal panel 110 and the support main 240 are mounted to support the entire liquid crystal display device, And the edge of the horizontal plane 251 is vertically bent to form a side surface 253.

Here, the cover bottom 250 functions to stably guide the support main 240 so as to prevent the modularized liquid crystal display device from shaking and maintain a stable fixed state.

The top cover 230 prevents the liquid crystal panel 110 and the backlight unit 220 from being attached and detached forward and removes light leakage that may occur at intervals between the liquid crystal panel 110 and the support main 240 As shown in FIG.

The top cover 230 has a rectangular frame shape bent in a "? &Quot; shape so as to cover the upper surface edge and the side surface of the liquid crystal panel 110. The top cover 230 is opened at the liquid crystal panel 110 And displays an image to be implemented.

Accordingly, the top cover 230, the support main 240, and the cover bottom 250 of the present invention are assembled and fastened to each other to modularly integrate the liquid crystal panel 110 and the backlight unit 220 together.

In this case, the top cover 240 may be referred to as a case top or a top case, and the support main 230 may be referred to as a guide panel or a main support or a mold frame. The cover bottom 250 may be referred to as a bottom cover or a bottom cover I will.

Meanwhile, the liquid crystal display device of the present invention includes an LED 229a including a blue LED chip (not shown), a Y_silicate + R phosphor (not shown) in which a silicate type yellow phosphor and a red phosphor are mixed, The red color filter pattern of the color filter layer 134 of the liquid crystal panel 110 is used as a red color pigment mixed with the Red 254 pigment and the Red 177 pigment in a ratio of 50:50 The green (G) color filter pattern is formed of a green (G) pigment mixed with a green 58 pigment and a yellow 138 pigment in a ratio of 80:20, and the blue (B) color filter pattern is formed of a blue 15: (R), green (G), and blue (B) pigments of the liquid crystal panel 110 can be realized by forming a blue (B) pigment mixed with a Dye pigment in a ratio of 87:13, (B) -color color filter layer 134 is a color coordinate system that represents the color reproduction ratio of the HDTV (High Definition Television) The color coordinates of BT.709 are very satisfactory.

In more detail, the liquid crystal display of the present invention is blended in an optimal state so as to improve the transmittance of color filter patterns of red (R), green (G) and blue (B) do.

As a result, the luminance is improved, thereby realizing a liquid crystal display device of high luminance.

That is, in order to improve the transmittance of red color and green color having low transmittance, a red (R) color filter pattern is formed by mixing red (R ) Pigment, and the green (G) color filter pattern is mixed with Green 58 pigment and Yellow 138 at a ratio of 80:20.

At this time, the Yellow 138 pigment has a higher transmittance than the Yellow 150 pigment.

Therefore, the yellow 150 pigment is omitted from the red (R) pigment and the yellow 150 pigment of the green (G) pigment is changed to the yellow 138 pigment, thereby improving the transmittance of the red color and the green color.

In addition, the blue (B) color filter pattern replaces the V23 pigment having a small particle size to form a Violet Dye pigment that can reduce scattering of light, thereby reducing light scattering and reducing the amount of light lost, And also improves.

Therefore, by improving the transmittance of the pigment of the red (R), green (G), and blue (B) color filter patterns of the present invention, the luminance can be improved.

Condition Relative luminance Sample 1 100% Sample 2 105%

In Table 1, Sample 1 shows that the red (R) pigment and the green (G) pigment contain Yellow 150 pigment and the blue (B) pigment contains red (R) (B). Sample 2 is a liquid crystal display device comprising a red (R) color filter pattern according to an embodiment of the present invention, a red (R) color filter and a Red 177 pigment mixed in a ratio of 50:50 (G) color filter pattern is formed of a green (G) pigment mixed with a green 58 pigment and a yellow 138 pigment in a ratio of 80:20, and a blue (B) color filter pattern is formed with a blue : 6 pigment and Violet Dye pigment were formed through a blue (B) pigment mixed at a ratio of 87:13.

Referring to the above table (1), when the luminance of Sample 1 is 100%, it can be confirmed that the luminance of Sample 2 is increased to 105%.

This is because the transmittance of the red (R), green (G), and blue (B) color filter patterns is improved.

By changing the phosphor (not shown) of the LED 229a, which is the light source of the backlight unit 220, in accordance with the color filter layer 134 of the optimal combination for achieving such high luminance, The color coordinates of BT.709, which is a color coordinate system in which the recall ratio shows the color reproduction ratio of HDTV (High Definition Television), is very satisfactory.

Here, the color recall ratio refers to a range of colors that a display device including a liquid crystal display device can express, which measures the color coordinates and luminance of red (R), green (G), and blue (B) Color Reproduction can be obtained for 3 Primary Colors.

That is, the LED 229a according to the embodiment of the present invention is formed of a Y_silicate + R phosphor (not shown) in which a blue LED chip (not shown), a silicate type yellow phosphor and a red phosphor are mixed. The LED 229a increases the content of the red phosphor and decreases the content of the green phosphor compared to the conventional RG phosphor, so that the entire color wavelength band is shifted.

In particular, the main peak of the green color is shifted from 530 nm to 536 nm.

4 is a graph showing a spectrum of an LED including an RG phosphor and a Y_silicate + R phosphor according to an embodiment of the present invention.

Referring to FIG. 4, a blue color having a wavelength of 430 to 480 nm, a red color having a wavelength of 645 to 655 nm, and a red color having a wavelength of 520 to 540 nm are formed from an LED including an RG phosphor and a Y_silicate + The green light of the wavelength band is emitted. In contrast to the spectrum of the white light emitted from the LED including the RG phosphor, the LED including the Y_silicate + R phosphor according to the embodiment of the present invention It can be confirmed that the color wavelength band of the spectrum of the white light emitted from the light source is shifted as a whole.

It can also be seen that the main peak in the wavelength range of 520 to 540 nm and the wavelength of green is also shifted from 530 nm to 536 nm.

Therefore, the white light emitted from the LED (229a in Fig. 1) configured as described above is incident on the red (R), green (G) and blue (B) color filter layers (134 in Fig. 2) The chromaticity of BT.709, which is a color coordinate system that represents the color reproduction ratio of HDTV (High Definition Television), is very satisfactory.

Tables (2) and (3) below show the comparison of the overlap ratio of BT.709 with the color coordinates of a conventional liquid crystal display device and a liquid crystal display device according to an embodiment of the present invention.

Condition Red (Red) Green Blue Pigment Light source x y Y X y y x y Y Sample 1 Blue chip + RG phosphor 0.638 0.334 49 0.315 0.621 173 0.152 0.065 19 Sample 2 Blue chip + (Y_silicate + R phosphor) 0.660 0.329 50 0.313 0.594 180 0.149 0.071 23

Condition
White (White)
BT.709 overlap ratio Pigment Light source x y Y Sample 1 blue chip + RG phosphor 0.313 0.333 241 95.6% ample 2 blue chip + (Y_silicate + R phosphor) 0.312 0.325 253 97.1%

Sample 1 contains red (R) pigment and green (G) pigment include Yellow 150 pigment and blue (B) pigment contains red (R), green (G), and blue (B) (Not shown) of a blue LED (229a in FIG. 1) and an RG phosphor. Sample 2 is a liquid crystal display device in which a Red 254 pigment and a Red 177 pigment are mixed according to an embodiment of the present invention. A green (G) pigment mixed with Green 58 pigment and a Yellow 138 pigment in a ratio of 80:20 and a Blue 15: 6 pigment with a Violet Dye pigment in a ratio of 87:13 Green (G) and blue (B) color filter patterns made of blue (B) pigments mixed with a blue LED (not shown), and the LED (229a in FIG. 1) And a Y_silicate + R phosphor.

Referring to Table (2) and Table (3), it can be seen that the color coordinates of Red, Green and Blue of Sample 1 and Sample 2 are different.

That is, when the Yellow 150 pigment is omitted from the red (R) pigment, the Yellow 150 pigment of the green (G) pigment is changed to the Yellow 138 pigment, and the V23 pigment of the blue (B) pigment is formed of the Violet Dye pigment, . ≪ / RTI >

In addition, it can be seen that the overlap ratio of BT.709 is changed as the color coordinates are changed. It can be seen that the BT.709 overlap ratio of Sample 2 is 97.1%, which is higher than the BT.709 overlap ratio of Sample 1, which is 95.6% .

Accordingly, the liquid crystal display of the present invention includes an LED (229a in FIG. 1) including a blue LED chip (not shown), a Y_silicate + R phosphor (not shown) in which a silicate type yellow fluorescent material and a red fluorescent material are mixed, (R) pigment mixed with Red 254 pigment and Red 177 pigment in a ratio of 50:50, a green (G) pigment mixed with Green 58 pigment and Yellow 138 in a ratio of 80:20, Blue 15 : As the 6 pigment and the Violet Dye pigment penetrate the red (R), green (G), and blue (B) color filter layers (134 in FIG. 2) formed of a blue (B) pigment mixed at a ratio of 87:13 It can be seen that the implemented color gamut is more satisfactory than that of BT.709, which is a color coordinate system showing the color gamut of HDTV (High Definition Television).

As described above, the present invention is characterized in that the red (R) color filter pattern of the color filter layer (134 in Fig. 2) is formed of red (R) pigment mixed with Red 254 pigment and Red 177 pigment in a ratio of 50:50, The green (G) color filter pattern was formed of a green (G) pigment mixed with Green 58 pigment and Yellow 138 pigment in a ratio of 80:20, and the blue (B) color filter pattern was formed of a mixture of Blue 15: 6 pigment and Violet Dye pigment (B) pigment mixed at a ratio of 8:15 to 87:13, and the LED (229a in FIG. 1) as a light source is formed of a blue LED chip (not shown) and a Y_silicate + R phosphor (not shown), high brightness can be realized and the color reproduction rate of the liquid crystal display device can be improved. Accordingly, the color coordinate system of BT.709, which is a color coordinate system indicating the color reproduction ratio of HDTV (High Definition Television), is satisfied.

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.

112: array substrate, 114: color filter substrate
116: gate wiring, 118: data wiring,
119a, 119b: polarizer, 122: data pad, 124: pixel electrode,
132: black matrix, 134: color filter layer, 136: common electrode
150: liquid crystal layer

Claims (6)

A red color filter pattern formed by a red pigment consisting of Red 254 pigment and Red 177 pigment, a green color filter pattern formed by a green pigment consisting of Green 58 pigment and Yellow 138 pigment, : A liquid crystal panel including a color filter substrate on which a blue color filter pattern formed through a blue pigment composed of 6 pigments and a Violet Dye pigment is formed;
A LED disposed on the lower surface of the liquid crystal panel, an LED disposed on the reflection plate, the LED including a blue LED chip, a silicate type yellow phosphor, and a red phosphor; And a backlight unit
/ RTI >
The red pigment is mixed at a ratio of 50:50, the green pigment is mixed at a ratio of 80:20, and the blue pigment is mixed at a ratio of 87:13.
delete The method according to claim 1,
The silicate type yellow phosphor is composed of M2SiO4: Eu2 + (M = Ca, Sr, Ba, Zn).
The method according to claim 1,
Wherein the red phosphor is CaSiN ₂ : Eu ²⁺ or Sr (Ba) Si ₅ N ₈ : Eu ²⁺ .
The method according to claim 1,
Further comprising a light guide plate disposed under the optical sheet, wherein the LED is positioned to face the light entrance portion of the light guide plate.
The method according to claim 1,
On the inner surface of the array substrate,
A gate electrode and a data line crossing each other and defining a pixel region, the thin film transistor connected to the two lines, and the pixel electrode connected to the thin film transistor,
On the inner surface of the color filter substrate,
A black matrix corresponding to the gate and data lines and the thin film transistor, and a common electrode covering the color filter pattern and the black matrix.

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