CN1193744A

CN1193744A - Color filter with negative double refraction

Info

Publication number: CN1193744A
Application number: CN 96111696
Authority: CN
Inventors: 邵喜斌; 袁剑锋; 吴渊; 富淑清; 马凯; 马振军; 朱希玲; 黄锡珉
Original assignee: CHANGCHUN PHYS INST CHINESE
Current assignee: CHANGCHUN PHYS INST CHINESE
Priority date: 1996-08-29
Filing date: 1996-08-29
Publication date: 1998-09-23

Abstract

A colour filter with negative birefraction nature is made up by dispersing pigment or dye into polyimide as matrix which has negative birefraction, and features that the wavelength of penetrated light can be chosen while it also has phase compensation action, so widening the visual angle of LCD device.

Description

A kind of birefringent colored filter of negativity that has

The invention belongs to a kind of LCD.

LCD is with its complanation, low driving voltage, the performance that low-power consumption etc. are superior and developing rapidly.Visual angle and colorize are two big subject matters of constraint LCD development.LCD is by modulating the realization demonstration to transmitted light and reflected light.Realize colored the demonstration, generally need be divided into three parts to a picture dot, corresponding with three primary colours zone on the colored filter respectively, by selecting the bright dark attitude of three partial-pixels respectively, synthetic needed color.The optical filter of manufacturing at present only plays the effect of selecting to see through optical wavelength.Narrow viewing angle is twisted nematic liquid crystal display (TNLCD), the main difficulty that Supertwist liquid crystal display (STLCD) so that active matrix liquid crystal display (AMLCD) are faced.People propose a lot of methods and enlarge the visual angle, as the multidomain method, and curved arrangement method, lack of alignment method, polymer stabilizing dispersion method etc.The first two kind method manufacturing process complexity wherein, back two kinds of method contrasts reduce and poor stability, all do not realize suitability for industrialized production.Method is simple to utilize the compensation of birefringent polymer film, is widely adopted.But the thickness that this compensation method is used each coloured light is identical, can not satisfy the phase place requirement of each coloured light, and what adopt in the practical application is compromise, does not far reach perfect compensation effect.And up to now, colored filter and compensate film are discrete, need different technological processs, and this is disadvantageous to improving the finished product rate, reducing cost.

The invention provides and a kind ofly have the negativity birefringence (refractive index is No on the direction of membrane plane being parallel to, refractive index is Ne on perpendicular to the direction of film, the colored filter of characteristic of Ne＜No), compensate film and optical filter are integrated, reduce the technological process in the liquid crystal display device manufacturing significantly.Simultaneously, three primary colours light is selected for use different host materials or thicknesses of layers respectively, thereby all reach perfect compensation effect, make the visual angle of liquid crystal device obtain largest extension.

Colored filter composition material provided by the invention and manufacture method are as follows:

Its composition is pigment (or dyestuff) and has the negativity birefringence and be soluble in the polyimide substrate of organic solvent.Its manufacture method is pigment (or dyestuff) is disperseed by a certain percentage or to be dissolved in the corresponding polyimide solution, and mixed liquor is coated on the glass substrate, and utilization photoetching process or print process form needed figure, make colored filter.

The selection that this optical filter promptly has general optical filter sees through wavelength characteristic, has the negativity birefringence again, can realize TNLCD and AMLCD), the expansion at STNLCD visual angle.Use above-mentioned color filter film in the liquid crystal device manufacture process, reduced technological process, yield rate further improves.

Provide the embodiment of the invention below.

Embodiment one, to select polyimide for use be matrix, is dissolved in N-N ' dimethylacetamide solvent, makes 10% solution 100g, add spirit blue 1.8g, make mixed solution, be deposited on glass baseplate surface with whirl coating, the color film chromaticity coordinates that forms is (CIE1931) indigo plant: X=0.153, Y=0.109 is that the TNLCD of 5 μ m cooperates with thickness, obtains 90 ° of downwards angle of visibilities, 120 ° at visual angle, the left and right sides, relatively, be significantly improved with the visual angle of independent TNLCD (45 ° up and down, about 90 °).

Embodiment two, to select polyimide for use be matrix, be dissolved in N-N ' dimethylacetamide solvent, make 10% solution 100g, add the blue or green red pure pigment 1.3g of phthalein, make mixed solution, be deposited on glass baseplate surface with whirl coating, the color film chromaticity coordinates that forms is that (CIE1931) is red: X=0.625, and Y=0.340 cooperates with liquid crystal cell among the embodiment one, obtain 85 ° of downwards angle of visibilities, 115 ° at visual angle, the left and right sides.

Embodiment three, to select polyimide for use be matrix, be dissolved in N-N ' dimethylacetamide solvent, make 10% solution 100g, add the dark green G pigment of phthalein 1.2g, make mixed solution, be deposited on glass baseplate surface with whirl coating, the color film chromaticity coordinates that forms is that (CIE1931) is green: X=0.290, and Y=0.612 cooperates with liquid crystal cell among the embodiment one, obtain 91 ° of downwards angle of visibilities, 119 ° at visual angle, the left and right sides.

Claims

1. one kind has the birefringent colored filter of negativity, it is characterized in that with the polyimide with negativity birefringent characteristic be matrix, pigment or dyestuff are disperseed wherein, when selecting to see through optical wavelength, can change its phase place, play the effect of expansion visual angle of liquid crystal display.

2. according to the optical filter of the description manufacturing of claim 1, three primary colours light is selected different host materials or thickness respectively, to obtain the The optimal compensation effect.

3. according to the description of claim 1 and 2, have the liquid crystal display device of this optical filter.