CN2226775Y

CN2226775Y - Electric control double-reflection mode liquid crystal display device

Info

Publication number: CN2226775Y
Application number: CN94213100U
Authority: CN
Inventors: 孙睿鹏; 黄锡珉; 马凯
Original assignee: CHANGCHUN PHYS INST CHINESE
Current assignee: CHANGCHUN PHYS INST CHINESE
Priority date: 1994-05-23
Filing date: 1994-05-23
Publication date: 1996-05-08
Anticipated expiration: 2004-05-23

Abstract

The utility model belongs to an electric control double-reflection mode liquid crystal display device (ECB to LCD). The design adopts a dielectric insulation layer replacing a parallel directed orientation layer. Compared with the traditional ECB-LCD, the design has the advantages of large view angle, good symmetry, high contrast, nonexistent dependency position, good colorized display color uniformity, simple device preparingprocess technology, high device yield, low cost, etc. The design can be applied to a transmission type liquid crystal display device and a reflection type liquid crystal display device and can also be applied to the fields of a colorized liquid crystal display device, a large area projection display device, etc.

Description

A kind of LCD of electrically controlled birefringence mode

The design belongs to liquid crystal display device, specifically, relates to a kind of LCD (ECB-LCD) of electrically controlled birefringence mode.

The kind of LCD (LCD) is a lot, and wherein electrically conerolled birefringence (ECB) pattern just can realize colored the demonstration by changing voltage (without color filter film), and simple in structure, and operating voltage is low, thereby is subjected to gazing at of people.Among traditional ECB-LCD along the coated on both sides parallel orientation oriented layer of face arrange type at substrate; Mix (Zhan Qu) arrange type one side on substrate and apply the parallel orientation oriented layer, another side applies the vertical orientation oriented layer.And friction makes it to liquid crystal molecule consistent directional orientation effect be arranged.The LCD of this structure has some shortcomings that himself can't overcome:

1. the visual angle is asymmetric, poor contrast, and the position dependence at visual angle is strong;

2. its color is inhomogeneous during colored the demonstration;

3. device preparation technology complexity, friction orientation are handled and are easily produced many unfavorable factors such as dust and static, and its homogeneity is bad during the inclination vapor deposition treatment, and the evaporation area is restricted, these problems have had a strong impact on the quality of device, and the yield rate of device is reduced, and have increased device cost.

The design's purpose is the liquid crystal display device of electrically conerolled birefringence (ECB) pattern that discloses a kind of new structure, and the liquid crystal display device of this structure can improve above-mentioned three kinds of shortcomings.

In order to realize this purpose, the design adopts following technical scheme:

In ECB-LCD along the coated on both sides high molecular polymer dielectric insulation layer of the substrate of face arrange type; The one side of mixing the substrate of (Zhan Qu) arrange type applies the high molecular polymer dielectric insulation layer, and another side applies the vertical orientation oriented layer.The selection of polymer dielectric insulating material also requires it to have good photopermeability, light stability, thermal stability and chemical stability except requiring superior dielectric insulation performance, and the surface after the film forming has the performance that liquid crystal molecule is arranged in parallel.Simultaneously also can avoid transparency conductive electrode to contact with the direct of liquid crystal material.The high molecular polymer that satisfies above-mentioned condition has a lot, as polyimide, polyamide, polyvinyl alcohol (PVA), polycarbonate, polystyrene etc.

In the liquid crystal display device of this structure, because the steric interaction of dielectric insulation material and liquid crystal molecule makes the liquid crystal molecule of dielectric insulation laminar surface be parallel to this substrate surface arrangement; But do not handle because this dielectric insulation layer carries out directional orientation, so this dielectric insulation layer does not have oriented parallel to arrange the ability of liquid crystal molecule, liquid crystal molecule is the unordered ordered state that is parallel to the surface in the arrangement of this dielectric insulation laminar surface like this.When applying electric field, liquid crystal molecule will be arranged along direction of an electric field, and its birefringence is changed, and the transmitance of light also changes, thereby realize liquid crystal display.

The design compares with traditional ECB-LCD, has following advantage:

1. the visual angle is big, and symmetry is good;

2. contrast height, no position dependence;

3. the colored color uniformity that shows is good;

4. device preparation technology is simple, the device yield height, and cost descends.

Below in conjunction with drawings and Examples the design is described in further detail.

Fig. 1 be the design along face arrange type ECB-LCD structural representation;

Fig. 2 is mixing (Zhan Qu) arrange type ECB-LCD structural representation of the design.

Embodiment one, and preparation is along face arrange type ECB-LCD.(1)-polaroid among Fig. 1, (2)-glass or polymer matrix film, (3)-ITO layer, (4)-dielectric insulation layer, (5)-liquid crystal.To be dissolved with this dielectric insulation material or its in advance the solution (weight concentration is 0.1%-80%) of material (as polyamic acid of synthesis of polyimides etc.) be coated in the two sides of glass or polymer matrix film by sol evenning machine.Also can adopt print process, infusion process etc. that this solution is coated on the substrate, the heating evaporation solvent is realized polymerization and film forming then.Heating-up temperature is decided on polymkeric substance, and generally speaking, the evaporating temperature of solvent is between 100-200 ℃, and polymerization temperature is between 200-300 ℃.The thickness of dielectric insulation layer is between 0.01-0.05 μ m.With the substrate preparation LCD screen that has this dielectric insulation layer, can realize the ECB-LCD of structure shown in Figure 1.

Embodiment two, and preparation mixes (Zhan Qu) arrange type ECB-LCD.(1)-polaroid among Fig. 2, (2)-glass or polymer matrix film, (3)-ITO layer, (4)-dielectric insulation layer, (5)-liquid crystal, (6)-vertical orientated layer.All the other are with embodiment one.

The design can be applicable to transmission-type and reflective two types liquid crystal display device, also can be applicable to fields such as colour LCD device and large tracts of land projection display device.

Claims

1. the liquid crystal display device of an electrically controlled birefringence mode comprises polaroid, substrate, and the ITO layer, liquid crystal is characterized in that the one side at least of substrate is a dielectric insulation layer.