EP0234429A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Liquid crystal device with a charge strage structure
Assignee: Semiconductor Energy Laboratory Co Ltd
•
Filing: 1987-02-12
•
Granted: —
•
Expires: 2007-02-12
Abstract
Abstract An improved liquid crystal device which is driven by applying electric field thereon is shown. The device includes a liquid crystal layer (5) which is separated into pixels and whose optical nature is changed by the electric field induced therein. Contiguous to the liquid crystal layer, a semiconductor charge storage film (6) is provided to give hysteresis to the device.
Inventors
- 👤 Shunpei Yamazaki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 17:49
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/137; G02F1/1333; G02F1/133345
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
49 words
A liquid crystal device comprising: a transparent substrate; an opposed substrate; a liquid crystal layer whose optical property changes with electric field induced therein; electrode arrangment for inducing electric field in said liquid crystal layer; and a charge strage region adjacent to said electrode arrangment with an insulator inbetween.
Claim 2
Dependent Claim
49 words
A liquid crystal device comprising: a transparent substrate; an opposed substrate; a liquid crystal layer whose optical property changes with electric field induced therein; electrode arrangment for inducing electric field in said liquid crystal layer; and a charge strage region adjacent to said electrode arrangment with an insulator inbetween.
Claim 3
Dependent Claim
15 words
A device of claim 1 wherein said charge strage region is made of a semiconductor.
Claim 4
Dependent Claim
15 words
A device of claim 1 wherein said charge strage region is made of a metal.
Claim 5
Dependent Claim
16 words
A device of claim 1 wherein said charge strage region is made of a metallic compound.
Claim 6
Dependent Claim
16 words
A device of claim 4 wherein said charge strage region is made of a metal silicide.
Claim 7
Dependent Claim
16 words
A device of claim 1 wherein said charge strage region is made of a gerumanium compound.
Claim 8
Dependent Claim
22 words
A device of claim 3 wherein said metal is selected from a group consisting of Pt, Mo, Ta, Al, In and Sn.
Claim 9
Dependent Claim
16 words
A device of claim 1 wherein said liquid crystal layer consists of a ferroelectric liquid crystal.
Claim 10
Dependent Claim
12 words
A device of claim 1 wherein said optical characteristic is light transmissivity.
Claim 11
Dependent Claim
12 words
A device of claim 1 wherein said optical characteristic is absorption anisotoropy.
Claim 12
Dependent Claim
23 words
A device of claim 1 wherein said charge strage region is a film disposed between said electrode arrangement and said liquid crystal layer.
Claim 13
Dependent Claim
23 words
A device of claim 1 wherein said charge strage region is a clusters disposed between said electrode arrangement and said liquid crystal layer.
Claim 14
Dependent Claim
20 words
A device of claim 1 further comprising another insulator disposed between said charge strage region and said liquid crystal layer.
Claim 15
Dependent Claim
30 words
A device of claim 13 wherein the conductances of said insulators are so chosen that electric charge is drifted into said charge strage region through only one of said insulators.
Claim 16
Dependent Claim
14 words
A device of claim 2 wherein said semiconductor region is made from silicon semiconductor.
Claim 17
Dependent Claim
14 words
A device of claim 2 wherein said semoconductor region is made from gerumanium semiconductor.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.