US4824211A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of driving a liquid crystal display device
Assignee: Sharp Corp
•
Filing: 1987-12-18
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Granted: 1989-04-25
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Expires: 2007-12-18
Abstract
Abstract A method of driving a liquid crystal display device by a voltage averaging method comprises the step of operating this device at a bias ratio which is larger than the theoretically optimum bias ratio for the device so that unevenness in contrast is reduced.
Inventors
- 👤 Tetsuo Murata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:22
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3611; G09G3/3622; G09G2320/00; G09G2320/02; G09G2320/0209
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
51 words
A method of reducing unevenness in contrast in driving a liquid crystal display device at a high duty ratio by voltage averaging, said method comprising the step of operating said device at a bias ratio 1.2-4 times as large as the theoretically optimum bias ratio of said liquid crystal display device.
Claim 2
Independent Claim
51 words
A method of reducing unevenness in contrast in driving a liquid crystal display device at a high duty ratio by voltage averaging, said method comprising the step of operating said device at a bias ratio 1.2-4 times as large as the theoretically optimum bias ratio of said liquid crystal display device.
Claim 3
Dependent Claim
17 words
The method of claim 1 wherein said device is driven at a duty cycle of about 1/200.
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) | 1992-04-24 | 1992-10-24 | 1993-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-24 | 1996-10-24 | 1997-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-24 | 2000-10-24 | 2001-04-25 | $7700.00 | Window Closed / Lapsed |