US4286266A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Display device
Assignee: Fort James Corp
•
Filing: 1978-12-13
•
Granted: 1981-08-25
•
Expires: 1998-12-13
Abstract
Abstract In a liquid crystal display device which upon controlling with direct voltage shows a memory effect that can be erased by alternating voltage, the written area can expand beyond the edge of the electrode so that edge zones can no longer be erased readily. This disadvantage is avoided by covering the edges of the electrodes with an insulating layer.
Inventors
- 👤 Maarten de Zwart
- 👤 Johannes L. A. M. Heldens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:03
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/137; G02F1/13718; G02F1/133; G02F1/1333; G02F1/133345; G02F1/13756
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
110 words
A display device comprising at least two supporting plates; a plurality of control electrodes formed in a pattern on at least one of said supporting plates, said control electrodes being individually energized, a counter electrode formed on the other of said supporting plates; a layer of liquid crystal disposed between said supporting plates and in direct contact with said electrodes; a semi-permanent visible disturbance being induced in said liquid crystal by means of direct voltage and being erased by means of alternating voltage; and insulating means for covering at least the edges of said control electrodes said remaining surfaces of said electrodes remaining in direct contact with said liquid crystal.
Claim 2
Dependent Claim
110 words
A display device comprising at least two supporting plates; a plurality of control electrodes formed in a pattern on at least one of said supporting plates, said control electrodes being individually energized, a counter electrode formed on the other of said supporting plates; a layer of liquid crystal disposed between said supporting plates and in direct contact with said electrodes; a semi-permanent visible disturbance being induced in said liquid crystal by means of direct voltage and being erased by means of alternating voltage; and insulating means for covering at least the edges of said control electrodes said remaining surfaces of said electrodes remaining in direct contact with said liquid crystal.
Claim 3
Dependent Claim
22 words
A display device according to claim 1, wherein said insulating means also covers surfaces of said supporting plate between said control electrodes.
Claim 4
Dependent Claim
16 words
A display device according to claim 1, wherein said insulating means is a layer of polyparaxylylene.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-24 | 1985-02-23 | 1985-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-24 | 1989-02-23 | 1989-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-24 | 1993-02-23 | 1993-08-25 | $7700.00 | Window Closed / Lapsed |