US4805995A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal display with small carbon particles in its mark
Assignee: Alps Alpine Co Ltd
•
Filing: 1988-01-21
•
Granted: 1989-02-21
•
Expires: 2008-01-21
Abstract
Abstract A liquid crystal display device comprises a black mask layer formed by ink wherein particles of carbon have a diameter ranging from about 0.1 to about 0.3 microns. The carbon particle size is effective to inhibit carbon particles from aggregating themselves into a projection which may establish electric connection between a common electrode and a segment electrode of the liquid crystal display device. This improves the reliability of the liquid crystal display device and the yield upon production of liquid crystal display devices.
Inventors
- 👤 Tsunemitsu Torigoe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:05
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/133509; G02F1/133512; Y; Y10; Y10T; Y10T428/00; Y10T428/25
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
In a liquid crystal display device wherein a black mask layer is formed on an inner face of a substrate, the improvement wherein particles of carbon in ink which forms said black mask layer have a diameter ranging from about 0.1 to about 0.3 microns.
Claim 2
Dependent Claim
45 words
In a liquid crystal display device wherein a black mask layer is formed on an inner face of a substrate, the improvement wherein particles of carbon in ink which forms said black mask layer have a diameter ranging from about 0.1 to about 0.3 microns.
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) | 1992-02-21 | 1992-08-22 | 1993-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-21 | 1996-08-22 | 1997-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-21 | 2000-08-22 | 2001-02-21 | $7700.00 | Window Closed / Lapsed |