CN101191955B - LCD device - Google Patents

Abstract

The present invention provides a liquid crystal display device, comprising a liquid crystal display panel and a backlight module. The backlight module and the liquid crystal display panel are stacked. The backlight module comprises a circuit and a light source array. The circuit comprises a first port supplying power for the light source array. The light source array comprises a plurality of red light emitting diodes, a plurality of green light emitting diodes and a plurality of blue light emitting diodes, which are connected with each other in series, wherein, the numbers of the red, green and blue light emitting diodes are respectively a, b and c. The backlight module can coordinate with the liquid crystal display device to display a coordinate of the preconcerted color, and the values of a, b and c can be determined through the chromaticity coordinate of the coordinate in preconcerted color. The present invention is low in cost.

Description

Liquid crystal indicator

Technical field

The present invention is about a kind of liquid crystal indicator.

Background technology

Liquid crystal indicator has characteristics such as low diathermaneity, compact and power consumption are low because of it, thus day by day extensive in the use, and along with the ripe and innovation of correlation technique, its kind is also various day by day.LCD is as a kind of non-self-emission display apparatus, and generally comprising provides a module backlight that shows required planar light and a display panels that is used for display image.

In this module backlight, provide the light source of light be generally the cold cathode fluorescent tube (ColdCathode Fluorescent Lamp, CCFL) or light emitting diode (Light Emittlng Diode, LED).Wherein, because the red, green, blue Tricolor LED has very high color saturation as back light, now be subjected to concern widely gradually.

Seeing also Fig. 1 is that this liquid crystal indicator 1 of liquid crystal indicator structural representation that a kind of prior art discloses comprises a display panels 10 and a module 11 backlight, this module backlight 11 and these display panels 10 stacked settings, and provide display light for this display panels 10.

This display panels 10 comprises one first substrate 100, one second substrate 120 and a liquid crystal layer 110.This first substrate 100 is oppositely arranged with this second substrate 120, and this liquid crystal layer 110 is interposed between this first substrate 100 and second substrate 120.This first substrate 100 comprises a chromatic filter layer 130, and this chromatic filter layer 130 is arranged on this first substrate 100 near on the surface of this liquid crystal layer 110.This chromatic filter layer 130 comprises a plurality of red filter units 131, a plurality of green filter unit 132 and a plurality of blue filter unit 133, in order to full-color display image.

Seeing also Fig. 2, is the back light module unit structure synoptic diagram of Fig. 1 liquid crystal indicator.This module 11 backlight comprises feed circuit 111 and an array of source 112.These feed circuit 111 comprise one first port one 13, one second port one 14 and one the 3rd port one 15.This array of source 112 comprises a plurality of red light emitting diodes 116, a plurality of green LED 117 and a plurality of blue LED 118 of equal number, these a plurality of red light emitting diodes 116 are connected in series in this first port one 13, these a plurality of green LEDs 117 are connected in series in this second port one 14, and these a plurality of blue LEDs 118 are connected in series in the 3rd port one 15.

Because this red, green, blue look light emitting diode 116,117 is identical with 118 quantity and have different frequency spectrums respectively, in order to make this module 11 outgoing white lights backlight, need provide these red, green, blue look light emitting diode 116,117 operating voltage different to control the luminous intensity of this red, green, blue look light emitting diode 116,117 and 118 respectively with 118.So this first port one 13, second port one 14 provide different voltage respectively with the 3rd port one 15, make this red, green, blue look light emitting diode 116,117 have different working currents respectively, can be mixed into the purpose that shows required white light to reach three coloured light that this red, green, blue look light emitting diode 116,117 and 118 sent with 118.

But, in this module 11 backlight, need provide three different port ones 13,114 and 115 of voltage to power for the red, green, blue look light emitting diode 116,117 of this same number and 118, make the power supply circuit construction complexity, cost is higher.

Summary of the invention

In order to solve above-mentioned liquid crystal indicator power supply circuit construction complexity, the cost problem of higher is necessary to provide a kind of power supply circuit construction simple, lower-cost liquid crystal indicator.

A kind of liquid crystal indicator, it comprises a display panels and a module backlight, this module backlight and the stacked setting of this display panels; This module backlight comprises a circuit and an array of source, this circuit comprises one first port, it is this array of source power supply, this array of source comprises a plurality of red light emitting diodes that are connected in series, a plurality of green LEDs and a plurality of blue LED, wherein, this is red, green, the number of blue LED is respectively a, b, c, this module backlight can cooperate this liquid crystal indicator to show the predetermined color coordinate, and this a, b, the c value can be determined by this predetermined color coordinate chromaticity coordinate, the frequency spectrum of this red light emitting diodes is S (R), the frequency spectrum of this green LED is S (G), the frequency spectrum of this blue LED is S (B), and the frequency spectrum that penetrates that this display panels is in when showing red status is τ _R(λ), the frequency spectrum that penetrates that is in when showing green state is τ _G(λ), the frequency spectrum that penetrates that is in when showing blue color states is τ _R(λ), this display panels show red chromaticity coordinate be predetermined value be (xR, yR), this display panels show green chromaticity coordinate be predetermined value be (xG, yG), this display panels show blue chromaticity coordinate be predetermined value be (xB, yB),

Be spectral tristimulus value, A, B, C are unknown quantity, by the solving equation group:

$\left\{\begin{array}{c}\mathrm{Xin}=S\left(n\right){\mathrm{\τ}}_n\left(\mathrm{\λ}\right)\stackrel{\‾}{x}\left(\mathrm{\λ}\right)\\ \mathrm{Yin}=S\left(n\right){\mathrm{\τ}}_n\left(\mathrm{\λ}\right)\stackrel{\‾}{y}\left(\mathrm{\λ}\right)\\ \mathrm{Zin}=S\left(n\right){\mathrm{\τ}}_n\left(\mathrm{\λ}\right)\stackrel{\‾}{z}\left(\mathrm{\λ}\right)\end{array}\right.,i=\mathrm{1,2,3},n=R,G,B$

$\mathrm{XRR}=(A,B,C)\·\left[\begin{array}{c}X1R\\ X2R\\ X3R\end{array}\right]$ $\mathrm{XGR}=(A,B,C)\·\left[\begin{array}{c}X1G\\ X2G\\ X3G\end{array}\right]$ $\mathrm{XBR}=(A,B,C)\·\left[\begin{array}{c}X1B\\ X2B\\ X3B\end{array}\right]$

$\mathrm{YRG}=(A,B,C)\·\left[\begin{array}{c}Y1R\\ Y2R\\ Y3R\end{array}\right]$ $\mathrm{YGG}=(A,B,C)\·\left[\begin{array}{c}Y1G\\ Y2G\\ Y3G\end{array}\right]$ $\mathrm{YBG}=(A,B,C)\·\left[\begin{array}{c}Y1B\\ Y2B\\ Y3B\end{array}\right]$

$\mathrm{ZRB}=(A,B,C)\·\left[\begin{array}{c}Z1R\\ Z2R\\ Z3R\end{array}\right]$ $\mathrm{ZGB}=(A,B,C)\·\left[\begin{array}{c}Z1G\\ Z2G\\ Z3G\end{array}\right]$ $\mathrm{ZBB}=(A,B,C)\·\left[\begin{array}{c}Z1B\\ Z2B\\ Z3B\end{array}\right]$

$\mathrm{xR}=\frac{\mathrm{XRR}}{\mathrm{XRR}+\mathrm{YRG}+\mathrm{ZRB}},$ $\mathrm{yR}=\frac{\mathrm{YRG}}{\mathrm{XRR}+\mathrm{YRG}+\mathrm{ZRB}}$

$\mathrm{xG}=\frac{\mathrm{XGR}}{\mathrm{XGR}+\mathrm{YGG}+\mathrm{ZGB}},$ $\mathrm{yG}=\frac{\mathrm{YGG}}{\mathrm{XGR}+\mathrm{YGG}+\mathrm{ZGB}}$

$\mathrm{xB}=\frac{\mathrm{XBR}}{\mathrm{XBR}+\mathrm{YBG}+\mathrm{ZBB}},$ $\mathrm{yB}=\frac{\mathrm{YBG}}{\mathrm{XBR}+\mathrm{YBG}+\mathrm{ZBB}}$

Determine this A: B: C, then a, b, c are for satisfying the integer solution of A: B: C in the permissible error scope.

Compared with prior art, liquid crystal indicator of the present invention is owing to adopted this first port to provide a voltage to be this array of source power supply, and carry out corresponding design at the number of this red, green, blue look light emitting diode and realized that prior art needs the effect of three port workings realizations, has reduced cost.And this circuit only has voltage of output, makes power supply circuit construction simple.

Description of drawings

Fig. 1 is the liquid crystal indicator structural representation that a kind of prior art discloses.

Fig. 2 is the back light module unit structure synoptic diagram of Fig. 1 liquid crystal indicator.

Fig. 3 is the structural representation of first embodiment of the invention liquid crystal indicator.

Fig. 4 is the back light module unit structure synoptic diagram of liquid crystal indicator shown in Figure 3.

Fig. 5 is the 1391CIE-xy chromatic diagram that International Commission on Illumination announces.

Fig. 6 is the back light module unit structure synoptic diagram of second embodiment of the invention liquid crystal indicator.

Embodiment

Seeing also Fig. 3, is the structural representation of first embodiment of the invention liquid crystal indicator.This liquid crystal indicator 2 comprises a display panels 20 and a module 21 backlight.This module backlight 21 and these display panels 20 stacked settings, and provide display light for this display panels 20.

This display panels 20 comprises one first substrate 200, one second substrate 220 and a liquid crystal layer 210.This first substrate 200 is oppositely arranged with this second substrate 220, and this liquid crystal layer 210 is interposed between this first substrate 200 and second substrate 220.

This first substrate 200 is provided with one first polaroid 290 away from the surface of this liquid crystal layer 210.This first substrate 200 is sequentially provided with a chromatic filter layer 230, a common electrode layer 240 and one first both alignment layers 250 near on the surface of this liquid crystal layer 210.Wherein, this chromatic filter layer 230 comprises a plurality of red filter units 231, a plurality of green filter unit 232 and a plurality of blue filter unit 233, and with certain regular repeated arrangement.

This second substrate 220 is provided with one second polaroid 219 away from the surface of this liquid crystal layer 210.This second substrate 220 is sequentially provided with a pixel electrode layer 221 and one second both alignment layers 222 near on the surface of this liquid crystal layer 210.

Seeing also Fig. 4, is the back light module unit structure synoptic diagram of liquid crystal indicator shown in Figure 3.This module 21 backlight comprises feed circuit 211 and an array of source 214.These feed circuit 211 have one first port 212, and it provides a voltage to be these array of source 214 power supplies.This array of source 214 comprises a plurality of red light emitting diodes 215, a plurality of green LED 216 and a plurality of blue LED 217.These a plurality of red light emitting diodes 215, a plurality of green LED 216 and a plurality of blue LED 217 are connected in series in regular turn, and are connected this first port 212.Wherein, these a plurality of red light emitting diodes 215 numbers are a, and a plurality of green LED 216 numbers are b, and a plurality of blue LED 217 numbers are c.

Seeing also Fig. 5, is the synoptic diagram of the 1391CIE-xy chromatic diagram of International Commission on Illumination's announcement.Arbitrarily the visible light of wavelength can be with unique the representing of the chromaticity coordinate of 1931CIE-XYZ standard colorimetric system among the figure.Above-mentioned red, green, blue look light emitting diode 215,216 and 217 number a, b, definite need of c make the emergent light of this module 21 backlight cooperate this display panels 20 can show predetermined red, green, blue look and other color.Wherein, the chromaticity coordinate of the 1931CIE-XYZ standard colorimetric system that can be announced by International Commission on Illumination of this predetermined red, green, blue look and other color is measured.

Illustrate how to determine before this a, b, the c, at first briefly narrate the key concept and the principle of 1931CIE-XYZ standard colorimetric system.

Arbitrary hue can be expressed by following formula:

C＝X[X]+Y[Y]+Z[Z]

Wherein, this C represents arbitrary hue, and this [X], [Y], [Z] are the three primary colours of unit quantity, and X, Y, Z are tristimulus values.

Tristimulus values can be determined by following formula:

$\left\{\begin{array}{c}X=\mathrm{k\ΣS}\left(\mathrm{\λ}\right)\mathrm{\τ}\left(\mathrm{\λ}\right)\stackrel{\‾}{x}\left(\mathrm{\λ}\right)\mathrm{\Δ\λ}\\ Y=\mathrm{k\ΣS}\left(\mathrm{\λ}\right)\mathrm{\τ}\left(\mathrm{\λ}\right)\stackrel{\‾}{y}\left(\mathrm{\λ}\right)\mathrm{\Δ\λ}\\ Z=\mathrm{k\ΣS}\left(\mathrm{\λ}\right)\mathrm{\τ}\left(\mathrm{\λ}\right)\stackrel{\‾}{z}\left(\mathrm{\λ}\right)\mathrm{\Δ\λ}\end{array}\right.---\left(1\right)$

τ(λ)＝∏τ _i(λ)

Wherein,

Be called spectral tristimulus value, S (λ) is the light source frequency spectrum, and τ (λ) is for penetrating frequency spectrum, and k is a parameter, and λ is a wavelength.

The chromaticity coordinate formula of 1931CIE-XYZ standard colorimetric system can be expressed as:

$x=\frac{X}{X+Y+Z},$ $y=\frac{Y}{X+Y+Z}---\left(2\right)$

Describe the step that this red, green, blue look light emitting diode number is determined below in detail.

One, at first obtains desired parameters;

Obtain single this red, green, blue look light emitting diode 215,216 with 217 under identical working current corresponding light source frequency spectrum S (R), S (G), S (B), this first polaroid 290 penetrate frequency spectrum τ ₂(λ), second polaroid 219 penetrates frequency spectrum τ ₃(λ), pixel electrode layer 221 penetrates frequency spectrum τ ₄(λ), common electrode layer 240 penetrates frequency spectrum τ ₄(λ), first both alignment layers 250 penetrates frequency spectrum τ ₅(λ), second both alignment layers 222 penetrates frequency spectrum τ ₆(λ), chromatic filter layer 230 red filter units 231 penetrates frequency spectrum τ _1R(λ), green filter unit 232 penetrates frequency spectrum τ _1G(λ), red filter unit 233 penetrates frequency spectrum τ _1B(λ) and the spectral tristimulus value table.

When two, calculating single this red, green, blue look light emitting diode 215,216 and 217 respectively as light source, this liquid crystal indicator 2 shows the tristimulus values of red, green, blue look;

Suppose single this red light emitting diodes 215 as this array of source 214, make this liquid crystal indicator 2 show corresponding red, green, blue look by this red, green, blue look filter unit 231,232 and 233 respectively, calculate the tristimulus values of shown red, green, blue look according to formula (1).Be changed to single this green LED 216 and blue LED 217 in regular turn, calculate identical content.That is, calculate the value of listed each variable of following table:

Three, according to superposition principle, when calculating many light emitting diodes as light source, this liquid crystal indicator 2 shows the tristimulus values of red, green, blue look;

According to the Grassman law, the eye response of human eye should be depended on the three-component algebraic sum of red, green, blue, and promptly its ratio has determined the color of vision.So these a plurality of red light emitting diodes 215 numbers of hypothesis are a, a plurality of green LED 216 numbers are b, and a plurality of blue LED 217 numbers are c.According to superposition principle, when calculating it as this array of source 214, this liquid crystal indicator 2 shows each tristimulus values of red, green, blue look.That is, calculate the value of listed each variable of following table:

Wherein, the concrete computing formula of each variable with matrix representation is:

$\mathrm{XRR}=(a,b,c)\·\left[\begin{array}{c}X1R\\ X2R\\ X3R\end{array}\right]$ $\mathrm{XGR}=(a,b,c)\·\left[\begin{array}{c}X1G\\ X2G\\ X3G\end{array}\right]$ $\mathrm{XBR}=(a,b,c)\·\left[\begin{array}{c}X1B\\ X2B\\ X3B\end{array}\right]$

$\mathrm{YRG}=(a,b,c)\left[\begin{array}{c}Y1R\\ Y2R\\ Y3R\end{array}\right]$ $\mathrm{YGG}=(a,b,c)\·\left[\begin{array}{c}Y1G\\ Y2G\\ Y3G\end{array}\right]$ $\mathrm{YBG}=(a,b,c)\·\left[\begin{array}{c}Y1B\\ Y2B\\ Y3B\end{array}\right]$

$\mathrm{ZRB}=(a,b,c)\·\left[\begin{array}{c}Z1R\\ Z2R\\ Z3R\end{array}\right]$ $\mathrm{ZGB}=(a,b,c)\·\left[\begin{array}{c}Z1G\\ Z2G\\ Z3G\end{array}\right]$ $\mathrm{ZBB}=(a,b,c)\·\left[\begin{array}{c}Z1B\\ Z2B\\ Z3B\end{array}\right]---\left(3\right)$

Its result of calculation is to contain the equation of not determining amount a, b, c.

Four, with the chromaticity coordinate that is converted to of tristimulus;

According to formula (2), the tristimulus values of calculating above is converted to chromaticity coordinate.

Promptly $\mathrm{xR}=\frac{\mathrm{XRR}}{\mathrm{XRR}+\mathrm{YRG}+\mathrm{ZRB}},$ $\mathrm{yR}=\frac{\mathrm{YRG}}{\mathrm{XRR}+\mathrm{YRG}+\mathrm{ZRB}}$

$\mathrm{xG}=\frac{\mathrm{XGR}}{\mathrm{XGR}+\mathrm{YGG}+\mathrm{ZGB}},$ $\mathrm{yG}=\frac{\mathrm{YGG}}{\mathrm{XGR}+\mathrm{YGG}+\mathrm{ZGB}}$ (4)

$\mathrm{xB}=\frac{\mathrm{XBR}}{\mathrm{XBR}+\mathrm{YBG}+\mathrm{ZBB}},$ $\mathrm{yB}=\frac{\mathrm{YBG}}{\mathrm{XBR}+\mathrm{YBG}+\mathrm{ZBB}}$

Five,, find the solution the proportionate relationship a of unknown quantity a, b, c: b: c with the chromaticity coordinate value substitution of standard colorimetric system;

Definite need of this red, green, blue look light emitting diode 215,216 and 217 numbers make the emergent light of this module 21 backlight cooperate this display panels 20 can show predetermined red, green, blue look and other color.So chromaticity coordinate and (3) formula substitution (4) formula with the pairing 1931CIE-XYZ standard colorimetric system of predetermined color, obtain a system of homogeneous linear equations about a, b, c, because the system of homogeneous linear equations tool does not have unique solution, can only determine the proportionate relationship of a, b, c, i.e. a: b: c=A: B: C.Former all this a: b: c=A: B that satisfies: a of C condition, b, a c number average can reach and cooperate this display panels 20 can show the desirable red, green, blue look and the purpose of other color.

Six, determine a, b, c;

The above-mentioned A that tries to achieve, B, C may not be integers, and this a, b, c are red, green, blue look light emitting diode 215,216 and 217 numbers in the actual conditions, be integer, so this a, b, c can choose one group of integer in certain precision, make its ratio a: b: c and this A: B: C are the most approaching.Again because and the most approaching integer a, b, the c of A: B: C may not meet actual conditions for large numbers of integers, so choose one group of quantity less and and comparatively approaching integer a, the b of A: B: C, the needs that c promptly can satisfy actual conditions.

By above-mentioned steps, finish determining of this red, green, blue look light emitting diode 215,216 and 217 numbers in this module 21 backlight.

In addition, consider the red of close quantity, green, blue LED 215,216 and 217 according to certain rule mixing arrangement, can obtain good even light mixing, so this is red choosing, green, blue LED 215,216 and 217 o'clock, can choose the red of suitable frequency spectrum, green, blue LED 215,216 and 217, make by above-mentioned steps determine red, green, blue LED 215,216 and 217 numbers than A: B: C as far as possible near 1: 2: 1, to reach red after the arrangement, green, blue LED 215,216 and 217 can realize even mixed light.

Compared to prior art, liquid crystal indicator 2 of the present invention is owing to adopted this first port to provide a voltage to be this array of source power supply, and carry out corresponding design at the number of this red, green, blue look light emitting diode and realized that prior art needs the effect of three port workings realizations, has reduced cost.And this circuit only has voltage of output, makes power supply circuit construction simple.

Seeing also Fig. 6, is the back light module unit structure synoptic diagram of second embodiment of the invention liquid crystal indicator.The difference of the module backlight 21 of this module 31 backlight and the first embodiment liquid crystal indicator 2 is: this module 31 backlight also comprises a fine setting array 313.These feed circuit 311 also comprise one second port 310, are these fine setting array 313 power supplies.This fine setting array 313 comprises a red light emitting diodes 318 and a green LED 319.This red light emitting diodes 318 is connected in series with this green LED 319, and is connected this second port 310.

Because the described principle of first embodiment, the red, green, blue look light emitting diode number a of this array of source 314, b, c must be integer, and its ratio might not exclusively equate with the A that calculates: B: C.The voltage that this second port 310 provides is low than the voltage of this first port 312, can make the red light emitting diodes 318 and the green LED 319 of this fine setting array 313 be operated in lower power, make this red light emitting diodes 318 and green LED 319 practical functions less than single red, green LED in this array of source 314.

Compared to first embodiment, the liquid crystal indicator of present embodiment is owing to adopted this fine setting array 313 and second port 310, on the basis of existing array of source 314, cooperate array of source 314 to finely tune, the chromaticity coordinate that makes display light is more near ideal value.

But liquid crystal indicator of the present invention is not limited to first embodiment and second embodiment is described, and wherein this fine setting array comprises in the red, green, blue look light emitting diode at least one.The output voltage of this second port also can be higher than the voltage of this first port.

Claims (9)

1. liquid crystal indicator, it comprises a display panels and a module backlight, this module backlight and the stacked setting of this display panels; This module backlight comprises a circuit and an array of source, it is characterized in that: this circuit comprises one first port, it is this array of source power supply, this array of source comprises a plurality of red light emitting diodes that are connected in series, a plurality of green LEDs and a plurality of blue LED, this is red, green, the number of blue LED is respectively a, b, c, this module backlight can cooperate this liquid crystal indicator to show the predetermined color coordinate, and this a, b, the c value can be determined by this predetermined color coordinate chromaticity coordinate, the frequency spectrum of this red light emitting diodes is S (R), the frequency spectrum of this green LED is S (G), the frequency spectrum of this blue LED is S (B), and the frequency spectrum that penetrates that this display panels is in when showing red status is τ _R(λ), the frequency spectrum that penetrates that is in when showing green state is τ _G(λ), the frequency spectrum that penetrates that is in when showing blue color states is τ _B(λ), this display panels show red chromaticity coordinate be predetermined value be (xR, yR), this display panels show green chromaticity coordinate be predetermined value be (xG, yG), this display panels show blue chromaticity coordinate be predetermined value be (xB, yB),

Be spectral tristimulus value, A, B, C are unknown quantity, by the solving equation group:

$\left\{\begin{array}{c}\mathrm{Xin}=S\left(n\right){\mathrm{\τ}}_n\left(\mathrm{\λ}\right)\stackrel{\‾}{x}\left(\mathrm{\λ}\right)\\ \mathrm{Yin}=S\left(n\right){\mathrm{\τ}}_n\left(\mathrm{\λ}\right)\stackrel{\‾}{y}\left(\mathrm{\λ}\right)\\ \mathrm{Zin}=S\left(n\right){\mathrm{\τ}}_n\left(\mathrm{\λ}\right)\stackrel{\‾}{z}\left(\mathrm{\λ}\right)\end{array}\right.,i=\mathrm{1,2,3},n=R,G,B$

$\mathrm{XRR}=(A,B,C)\·\left[\begin{array}{c}X1R\\ X2R\\ X3R\end{array}\right]$ $\mathrm{XGR}=(A,B,C)\·\left[\begin{array}{c}X1G\\ X2G\\ X3G\end{array}\right]$ $\mathrm{XBR}=(A,B,C)\·\left[\begin{array}{c}X1B\\ X2B\\ X3B\end{array}\right]$

$\mathrm{YRG}=(A,B,C)\·\left[\begin{array}{c}Y1R\\ Y2R\\ Y3R\end{array}\right]$ $\mathrm{YGG}=(A,B,C)\·\left[\begin{array}{c}Y1G\\ Y2G\\ Y3G\end{array}\right]$ $\mathrm{YBG}=(A,B,C)\·\left[\begin{array}{c}Y1B\\ Y2B\\ Y3B\end{array}\right]$

$\mathrm{ZRB}=(A,B,C)\·\left[\begin{array}{c}Z1R\\ Z2R\\ Z3R\end{array}\right]$ $\mathrm{ZGB}=(A,B,C)\·\left[\begin{array}{c}Z1G\\ Z2G\\ Z3G\end{array}\right]$ $\mathrm{ZBB}=(A,B,C)\·\left[\begin{array}{c}Z1B\\ Z2B\\ Z3B\end{array}\right]$

$\mathrm{xR}=\frac{\mathrm{XRR}}{\mathrm{XRR}+\mathrm{YRG}+\mathrm{ZRB}},$ $\mathrm{yR}=\frac{\mathrm{YRG}}{\mathrm{XRR}+\mathrm{YRG}+\mathrm{ZRB}}$

$\mathrm{xG}=\frac{\mathrm{XGR}}{\mathrm{XGR}+\mathrm{YGG}+\mathrm{ZGB}},$ $\mathrm{yG}=\frac{\mathrm{YGG}}{\mathrm{XGR}+\mathrm{YGG}+\mathrm{ZGB}}$

$\mathrm{xB}=\frac{\mathrm{XBR}}{\mathrm{XBR}+\mathrm{YBG}+\mathrm{ZBB}},$ $\mathrm{yB}=\frac{\mathrm{YBG}}{\mathrm{XBR}+\mathrm{YBG}+\mathrm{ZBB}}$

Determine this A: B: C, then a, b, c are for satisfying the integer solution of A: B: C in the permissible error scope.

2. liquid crystal indicator as claimed in claim 1, it is characterized in that: this circuit further comprises a fine setting array and second port for this fine setting array power supply, and this fine setting array comprises in red light emitting diodes, green LED and the blue LED at least one.

3. liquid crystal indicator as claimed in claim 1 is characterized in that: this each spectral tristimulus value and each chromaticity coordinate are spectral tristimulus value and each chromaticity coordinate in the 1931CIE-XYZ standard colorimetric system.

4. liquid crystal indicator as claimed in claim 1 is characterized in that: adjust the value of the frequency spectrum of this red, green and blue look light emitting diode, make the A that determines by this system of equations: B: C equals 1: 2: 1.

5. liquid crystal indicator as claimed in claim 1 is characterized in that: this display panels is a sandwich construction, and it penetrates the product that penetrate frequency spectrum of frequency spectrum for each layer structure.

6. liquid crystal indicator as claimed in claim 5 is characterized in that: the sandwich construction of this display panels comprises a chromatic filter layer, and this chromatic filter layer comprises that a plurality of frequency spectrums that penetrate are τ _1RRed filter unit (λ), a plurality of frequency spectrum that penetrates are τ _1GGreen filter unit (λ) and a plurality of frequency spectrum that penetrates are τ _1BBlue filter unit (λ), in this sandwich construction except that chromatic filter layer the product that penetrates frequency spectrum of other each layer be ∏ τ _i(λ), should

τ _R(λ)＝τ _1R(λ)∏τ _i(λ)

τ _G(λ)＝τ _1G(λ)∏τ _i(λ)

τ _B(λ)＝τ _1B(λ)∏τ _i(λ)。

7. liquid crystal indicator as claimed in claim 6 is characterized in that: this sandwich construction also comprises one first polaroid, one second polaroid, a liquid crystal layer, one first both alignment layers, one second both alignment layers.

8. liquid crystal indicator as claimed in claim 7 is characterized in that: this also comprises a common electrode layer and a pixel electrode layer this sandwich construction.

9. liquid crystal indicator as claimed in claim 2 is characterized in that: the voltage of this second port is less than the voltage of first port.

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