CN1982953A

CN1982953A - Method for adjusting display device white balance and liquid-crystal display device

Info

Publication number: CN1982953A
Application number: CN 200510022353
Authority: CN
Inventors: 高明; 李铁; 周秋桂
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2005-12-16
Filing date: 2005-12-16
Publication date: 2007-06-20

Abstract

The present invention relates to a method for adjusting white balance, which can enhance color depth. Its main content is to change the brightness of the three primary colors by changing the photoresist area or thickness of the three primary colors without changing the photoresist material, thereby adjusting the position of the white balance on the chromaticity diagram; by properly adjusting the white balance point, that is The display effect of the liquid crystal display can be improved. The invention relates to a liquid crystal display, at least one of the geometric dimensions of the photoresist materials corresponding to the three primary colors is different from at least another one.

Description

A kind of method and a kind of LCD of regulating display device white balance

[technical field]

The present invention relates to a kind of regulator solution crystal display white balance point optimum position method, and the LCD that adopts this method.

[background technology]

LCD (LCD) is because it has the brightness height, and low in energy consumption, advantages such as portability are occupied more and more important position in various moving electronic components, and its output also sharply expands, associated various technology fast developments.Its developing direction is also towards colorize, wide visual angle, and high brightness, high-contrast, the low-power consumption develop rapidly, various correlation techniques are maked rapid progress.Each LCD factory all is devoted to improve technology and produces yield to improve, thereby obtains maximum profit.

The main composition of LCD device is: upper and lower base plate, the liquid crystal layer between the two substrates, and the alignment film of auxiliary liquid crystal molecular orientation, the SiO of an insulation and protective effect ₂Overlay.The electrode pattern that the using light lithography forms on last lower glass substrate, for realizing colorize, upper strata glass uses the colored filter that is made of RGB three primary colors photoresistance material, each RGB constitutes a pixel, white light is decomposed, realize colorize thereby under different voltage, demonstrate different colors.

By sealant upper and lower base plate is linked together, the sept between the upper and lower base plate (spacer) keeps uniform cell gap (cell gap).Change by voltage on the electrode that is formed on upper and lower base plate drives liquid crystal molecule, and the amount of the light that passes the liquid crystal layer projection is controlled with display image.

Color is by light wavelength decision, from ruddiness (wavelength 635nm) to blue light (wavelength 435nm), about distinguishable more than the 100 kind of color that go out of people.The coloured light of this single wavelength is very bright-coloured, and people are called pure color.The actual coloured light great majority of seeing are that the light by many kinds of wavelength mixes.For example the continuous spectrum of sunshine from ruddiness to the blue light formed.

In just discovery of people a long time ago, human eye is a not really accurate optical identifier, and it is usually regarded the coloured light of different spectral components with a kind of color as.For example naked eyes can not divide any white light to be made up of the sunshine continuous spectrum, anyly are made up of three kinds of coloured light of red, green, blue, and this is the metamerism phenomenon.Experiment showed, to appoint and get three kinds and can not can form any coloured light that human eye can be differentiated by other two kinds of coloured light that mix mutually.Three primary colors phenomenon that Here it is also is that we manually realize colored basis.Common color display system all selects for use red, green, blue as three primary colors.

Select primary colors red (R), green (G), blue (B).r＝R/(R+G+B)，g＝G/(R+G+B)，b＝B/(R+G+B)。Because r+g+b=1, so, just can determine a kind of color uniquely only with the value that provides r and g.Here it is usually said chromatic diagram can direct representation brightness size in order to make coordinate figure, and international lighting association regulation adopts another kind of chromaticity coordinate X, Y, Z, and has linear conversion relation between R, G, B.If, the various colours of occurring in nature are measured its x, y numerical value by the colorimetric experimental method, and are painted in this coordinate plane as plane coordinate system with x, y, just can obtain chromatic diagram shown in Figure 1.Any point on this chromatic diagram edge ligulate curve is all represented the tone of a certain wavelength light, and any point in the curve is all represented the color of a certain mixed light that human eye can be seen.

The colored expression range of certain display device is by the cartographic represenation of area in the triangle that coordinate surrounded of its red, green, blue three look materials in chromatic diagram, as the triangle among Fig. 1 is exactly the colored expression range of TSC-system CRT colour TV, the chromaticity coordinate of its red, green, blue three-color phosphor is respectively (0.67,0.33), (0.21,0.71), (0.14,0.08).And the number of colours that display device can be represented is the notion of digital signal processing, representative be the figure place of the interface red, green, blue tristimulus signal of display and graphics processing unit, as common red, green, blue respectively denotable number of colours of system of 8 be (3 * 8) power of 2=16.7,1,000,000 looks.Theoretically, very little in a chromatic diagram triangle can be represented infinite multiple color, but this is nothing but numbers game, and real colored expressive force is to be decided by the triangle area size in the chromatic diagram.As long as the red, green, blue signal respectively reaches 8 and just can be described as true color, Duo figure place ordinary people's eyes have been not easy to distinguish again in the vitascan

The CRT TV is to realize by red, green, blue three-color phosphor stimulated luminescence, so its colored expressive force can reach the TSC-system CRT colour TV level of (being called for short NTSC), chromaticity coordinate as PDP red, green, blue three-color phosphor commonly used is respectively (0.641,0.356), (0.182,0.732), (0.147,0.067).

The colour of LCD TV is realized by the red, green, blue three-colour filter by white backlight, the spectral characteristic of CCFL (cold-cathode fluorescence lamp) backlight that adopts is also bad at present, the best colored expression range that can reach is 75% NTSC, so when LCD and PDP and CRT colour TV are put together, can feel significantly that the bright-colored degree of LCD TV is relatively poor.

White light by colored filter is divided into the RGB three primary colors, and the color that all LCD can show all is that three primary colors combine by different brightness thus.In case the photoresist of colored filter is determined, the coordinate of RGB three primary colors on chromatic diagram promptly decided thereupon, the color that this LCD can show is combined with appropriate brightness by three primary colors, when three kinds of brightness all reach maximal value, if three primary colors are theoretical values separately, then should display white, but we know, the trichromatic chromaticity coordinates that LCD can show can only reach about 70% of NTSC, this means three primary colors with the very big gap that has of theory, thereby the white of its demonstration has big gap with theoretical value.

Usually the method for adjusting colour gamut has the renewal photoresist, use the back light of high-quality more, obtained certain effect, but in Progress in technique and production cost, the cycle aspect of research and development will produce tremendous influence, for example use LED just can not realize commercialization because of its fancy price as backlight.

Traditional colored filter is made up of the rgb light resistance material that area and thickness equate fully, as shown in Figure 2.Because the photoresist performance limitations, the RGB three primary colors are realized the monochromatic light on the XYZ chromaticity diagram, and the difference of the optical property of three kinds of materials directly has influence on the real colour degree when constituting other color mixtures with three primary colors.

[summary of the invention]

The purpose of this invention is to provide a kind of method and a kind of LCD of regulating display device white balance, realize the white balance of higher level with simple method.

For achieving the above object, the method for regulator solution crystal display white balance of the present invention comprises the steps:

The physical dimension of the pairing photoresist of one or more primary colors in A, the regulator solution crystal display makes its physical dimension with the pairing photoresist of another primary colors at least variant, thereby regulates the position of white balance point;

B, measure the CIE characteristic of the colored filter of making of this kind method, observe white balance point moving on chromatic diagram

C, repeating step A, B move to needed position on the chromatic diagram up to white balance point.

This method can also comprise following feature:

The physical dimension of photoresist described in the steps A is meant the area and/or the thickness of photoresist.

Described photoresist has three kinds, corresponds respectively to three primary colors.

The Method for Area of photoresist comprises the steps: that (A1) makes the color filter mask version in the described regulator solution crystal display, makes the area of the pairing photoresist of three primary colors have one at least with another is variant at least; (A2) utilize above-mentioned color filter mask version to make colored filter, can obtain the photoresist that the photoresistance area is conditioned.

For achieving the above object, the present invention also proposes a kind of LCD, comprise the liquid crystal layer between upper and lower base plate, the upper and lower base plate, the three primary colors colored filter is arranged on upper substrate, correspond respectively to trichromatic photoresist on the optical filter, it is characterized in that: the physical dimension of the pairing photoresist of wherein one or more primary colors is variant with the physical dimension of the pairing photoresist of another primary colors at least, thereby regulates the position of white balance point.

This LCD can also comprise following feature: the physical dimension of described photoresist is meant the area and/or the thickness of photoresist.

The invention has the advantages that: do not changing employed photoresist, only by area that changes photoresist or the better white balance effect that thickness is realized LCD, by the trichromatic area of appropriate design, can produce more high performance colored filter, simultaneously can not improve original cost, thereby realize better display effect, and need not make big change, thereby reduced production cost present production procedure.The present invention can be implemented in better effect when showing white the screen, under the condition of photoresist that does not change colored filter itself and back light, only by the control of CF processing procedure process, just can realize easily.

[description of drawings]

Fig. 1 is CIE (international lighting association) 1931 chromatic diagram synoptic diagram.

Fig. 2 is the colored filter cell schematics.

Fig. 3 changes photoresistance area synoptic diagram.

Fig. 4 changes photoresistance thickness synoptic diagram.

[embodiment]

In liquid crystal indicator, every kind of color mixture is all synthetic with appropriate brightness by three primary colors, primaries brightness difference when different light to be matched colors reaches coupling, and available colour equation is represented:

C＝R(R)+G(G)+B(B) (1-1)

C represents light to be matched colors in the formula; (R), (G), (B) representative produce the unit quantity of the Red Green Blue of color mixture; R, G, B are respectively coupling wait the to match colors quantity of needed Red Green Blue, are called tristimulus values:

The brightness that every kind of photoresist sees through is relevant with the area and the thickness of photoresist, area is big more, the thin more then light transmission rate of thickness is big more, brightness is high more, and therefore, we can adjust the light percent of pass by optimal design different photoresistance size and thickness, regulate the R (R) in the formula (1-1), G (G), three constituents of B (B), thereby the display effect that realization is optimized with identical photoresist.

As an example of above patented method, following example has provided concrete design philosophy.

The purpose of optimal design is as much as possible near theoretical value when showing color mixture, liquid crystal indicator can show all colours in the triangle that three primary colors constitute, eight digit number word display device can show 16.7 hundred ten thousand looks, and its quantity can be thought near infinite look, and is promptly very color.We know if display device approaches theoretical white when being shown as white, the wavelength that is the Red Green Blue of International Commission on Illumination (CIE) regulation is respectively 700nm, 546.1nm, 435.8nm, in the color-match experiment, the equal-energy white that when the relative brightness ratio of this primaries is 1.0000: 4.5907: 0.0601, matches, so CIE chooses the unit quantity of this ratio as Red Green Blue, i.e. (R): (G): (B)=1: 1: 1.Although at this moment trichromatic brightness value does not wait, CIE treats the brightness value of each primary colors as a unit, so Red Green Blue light equal proportion mixing resultant is a white light in the coloured light additive color process, i.e. (R)+(G)+(B)=(W).

Concrete implementation step is as follows:

1. make the different color filter mask version of rgb light resistance area, as shown in Figure 3, the area S that is exemplified as the green photoresist of change is less than red and blue photoresist area, or the thickness b and the two outer two kinds of photoresists that change certain photoresist produce differences, and this change will be regulated as standard with the effect of actual displayed white balance;

2. measure the CIE characteristic of the colored filter of making of this kind method, observe white balance point moving on chromatic diagram;

3. the CIE characteristic that obtains according to actual measurement changes CF mask RGB size again, and determines area ratio and the thickness proportion of RGB at last;

4. use the mask parameter of determining based on the CIE actual characteristic to make colored filter.

In the design of colored filter, use the photoresistance area of the innovation that this patent proposed and thickness to adjust method to regulate the white balance of colored filter, can realize adjusting to display effect.

By regulating the method for test, measure the size and the thickness of different photoresistances the unit quantity of Red Green Blue is regulated, realize that white light shows accurately, can realize true coloured light proportioning.

According to above description as can be known, when white point changed in the photoresistance size, its essence was the mobile of position on chromatic diagram, showed as the position of the middle intersection point of Fig. 1 on figure and moved, and can detect pure white light by instrument, thereby provide the s and the b value of optimal design.And then, in the processing procedure of colored filter,, realize different photoresistance patterns, and then realize that the white balance of optimizing shows by changing mask.

By utilizing said method, we have made a kind of novel LCD, its distinguishing feature is variant corresponding to the physical dimension of the trichromatic photoresist of RGB (area, thickness), rather than, form optical filter by the rgb light resistance material that area and thickness equate fully as prior art.

Claims

1. a method for adjusting liquid crystal display white balance, it is characterized in that comprising the steps:

A. Adjust the geometric size of the photoresist material corresponding to one or more primary colors in the liquid crystal display to make it different from the geometric size of the photoresist material corresponding to at least another primary color, thereby adjusting the position of the white balance point;

B. Measure the CIE characteristics of the color filter made by this method, and observe the movement of the white balance point on the chromaticity diagram

C. Repeat steps A and B until the white balance point moves to the desired position on the chromaticity diagram.

2. The method for adjusting the white balance of a liquid crystal display according to claim 1, wherein the geometric size of the photoresist material in step A refers to the area (S) and/or thickness (b) of the photoresist material.

3. The method for adjusting the white balance of a liquid crystal display according to claim 1 or 2, characterized in that: there are three types of photoresist materials corresponding to the three primary colors.

4. the method for adjusting liquid crystal display white balance as claimed in claim 3 is characterized in that: the method for the area of described adjustment photoresist material in the liquid crystal display comprises the steps:

(A1) Make a color filter mask, so that at least one area (S) of the photoresist material corresponding to the three primary colors is different from at least another;

(A2) Making a color filter by using the above color filter mask to obtain a photoresist material with an adjusted photoresist area.

5. A liquid crystal display, comprising upper and lower substrates, and a liquid crystal layer between the upper and lower substrates. There are three primary color filters on the upper substrate, and photoresist materials respectively corresponding to the three primary colors are arranged on the filter. It is characterized in that: one of Or the geometric dimensions of the photoresist material corresponding to the plurality of primary colors are different from the geometric dimensions of the photoresist material corresponding to at least one other primary color, so as to adjust the position of the white balance point.

6. The method for adjusting the white balance of a liquid crystal display according to claim 5, wherein the geometric size of the photoresist material refers to the area and/or thickness of the photoresist material.