Liquid crystal display having trapezoidal color filters formed from a low-temperature curing polyamino resin having a photosensitive group

• US 5,568,293 A
• Filed: 04/28/1995
• Issued: 10/22/1996
• Est. Priority Date: 08/30/1986
• Status: Expired due to Term

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Kamio, Masaru, Tamura, Miki, Murata, Tatsuo, Takao, Hideaki, Kanbe, Junichiro, Sekimura, Nobuyuki, Kikuchi, Yoshiki
• Primary Examiner(s): Gross, Anita Pellman
• Assistant Examiner(s): TRICE, RONALD
• Application Number:
  US08/430,422
• Time in Patent Office: 543 Days
• Field of Search: 359/67, 359/68, 359/74, 359/100
• US Class Current: 349/106
• CPC Class Codes: G02F 1/133514 Colour filters

Abstract

Surface Stability Ferroelectric Liquid Crystal Device having color filters assembled avoids, generation of alignment defect ocurring in the initial alignment control step by providing space of 0-5 microns between adjacent trapezoidal color filters having prescribed taper angle and thickness.

Claims

1. A liquid crystal device comprising:

(a) plural transparent electrodes having a plurality of confronting portions formed therebetween;

(b) a pair of substrates supporting said transparent electrodes;

(c) a group of plural color filters arranged on the inner side of at least one of the above pair of substrates and arranged at positions corresponding to each of said plurality of confronting portions, said color filters being formed in trapezoidal shapes, provided that the relationships of 0°

<

θ

<

90° and

0<

W≦

d/tan θ

are satisfied where d (μ

m) is the thickness of said color filters, θ

(degrees) is the sectional taper angle between the lower bottoms of the color filters and the diagonal sides thereof and W (μ

m) is the overlapping width between adjacent color filters, said color filters comprising a colorant material dispersed in a low-temperature-curing polyamino resin having a photosensitive group in the molecule; and

(d) a chiral smectic liquid crystal arranged between said pair of substrates.

2. A liquid crystal device according to claim 1, wherein said polyamino type resin is an aromatic polyamide resin or polyimide resin having photosensitive group in the molecule and is capable of giving a cured film at 200°

C. or lower.

3. A liquid crystal device according to claim 1, wherein a protective film is provided between said color filters and said electrodes.

4. A liquid crystal device according to claim 1, wherein an alignment control film is provided for said chiral smectic liquid crystal.

5. A liquid crystal device according to claim 4, wherein a monoaxial alignment treatment axis is imparted to said alignment control film.

6. A liquid crystal device according to claim 5, wherein said monoaxial alignment treatment axis is a rubbing axis.

7. A liquid crystal device according to claim 1, wherein the film thickness of said color filters is in the range of from 0.5 μ

m to 5 μ

m.

8. A liquid crystal device according to claim 1, wherein said color filters exhibit one of blue, green or red color per color filter.

9. A liquid crystal device according to claim 8, wherein the film thicknesses of the color filters exhibiting one of blue, green or red colors are equal to each other.

10. A liquid crystal device according to claim 1, wherein the formation of the spiral structure of said chiral smectic liquid crystal is suppressed.