US4764766A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for driving and liquid crystal display device including dot matrix display part and fixed pattern display port
Assignee: Hitachi Ltd
•
Filing: 1986-02-03
•
Granted: 1988-08-16
•
Expires: 2006-02-03
Abstract
Abstract A method is disclosed for driving a liquid crystal display provided, in the same liquid crystal panel, with a dot matrix display part and a fixed pattern or segment display part. The dot matrix display part is driven in a time-multiplexed fashion, while the fixed pattern or segment display part is driven in a static fashion using driving voltage waveforms in common with the dot matrix display part.
Inventors
- 👤 Naofumi Aoyama
- 👤 Kiyoshige Kinugawa
- 👤 Yoshihiro Nozaki
- 👤 Hiroshi Sakurada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:12
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3611; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/133391
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
268 words
A method for driving a liquid crystal display device which, in a liquid crystal panel, is provided with a dot matrix display part composed of a plurality of picture elements which are constituted as a dot matrix by intersections of scanning electrodes arranged in a striped pattern and signal electrodes also arranged in a striped pattern and opposed to said scanning electrodes, and a fixed pattern display part composed of at least one electrode arranged in a pattern that represents information and at least one electrode opposed to said electrode arranged in said pattern or a segment display part composed of a plurality of segment electrodes constituting said pattern and at least one electrode opposed to said segment electrodes, said method comprising the steps of: sequentially selecting said scanning electrodes of said dot matrix display part, and applying a selected signal electrode voltage or a predetermined signal electrode voltage insufficient for selection to said signal electrodes of said dot matrix display part in accordance with information to be displayed, so that said dot matrix display part is driven in a time-multiplexed fashion; and constantly applying said predetermined signal electrode voltage to one electrode of an opposed pair of electrodes which constitute said fixed pattern display part or said segment display part, and applying said selected or predetermined signal electrode voltages to the other electrode of said opposed pair of electrodes which constitute said fixed pattern display part or said segment display part in accordance with the information to be displayed, so that said fixed pattern display part or said segment display part is driven in a static fashion.
Claim 2
Independent Claim
268 words
A method for driving a liquid crystal display device which, in a liquid crystal panel, is provided with a dot matrix display part composed of a plurality of picture elements which are constituted as a dot matrix by intersections of scanning electrodes arranged in a striped pattern and signal electrodes also arranged in a striped pattern and opposed to said scanning electrodes, and a fixed pattern display part composed of at least one electrode arranged in a pattern that represents information and at least one electrode opposed to said electrode arranged in said pattern or a segment display part composed of a plurality of segment electrodes constituting said pattern and at least one electrode opposed to said segment electrodes, said method comprising the steps of: sequentially selecting said scanning electrodes of said dot matrix display part, and applying a selected signal electrode voltage or a predetermined signal electrode voltage insufficient for selection to said signal electrodes of said dot matrix display part in accordance with information to be displayed, so that said dot matrix display part is driven in a time-multiplexed fashion; and constantly applying said predetermined signal electrode voltage to one electrode of an opposed pair of electrodes which constitute said fixed pattern display part or said segment display part, and applying said selected or predetermined signal electrode voltages to the other electrode of said opposed pair of electrodes which constitute said fixed pattern display part or said segment display part in accordance with the information to be displayed, so that said fixed pattern display part or said segment display part is driven in a static fashion.
Claim 3
Dependent Claim
102 words
A method according to claim 1, wherein said selected signal electrode voltage is alternately V 111 and V 112 with a predetermined period, said predetermined signal electrode voltage is alternately V 121 and V 122 with said predetermined period, and V.sub.121 =V.sub.111 +2/a V.sub.0 V.sub.122 =V.sub.112 -2/a V.sub.0 wherein V 0 is an amplitude of an alternating voltage applied across a liquid crystal layer at a selected picture element, a is an arbitrary constant larger than 3, and V 111 and V 112 are arbitrary values under the condition that V 111 ≠-1/a V 0 and V 112 ≠-1/a V 0 .
Claim 4
Dependent Claim
244 words
A liquid crystal display device comprising: a liquid crystal panel which is provided with a dot matrix display part composed of a plurality of picture elements which are constituted as a dot matrix by intersections of scanning electrodes arranged in a striped pattern and signal electrodes also arranged in a striped pattern and opposed to said scanning electrodes, and a fixed pattern display part composed of at least one electrode arranged in a pattern that represents information and at least one electrode opposed to said electrode arranged in said pattern or a segment display part composed of a plurality of segment electrodes constituting said pattern and at least one electrode opposed to said segment electrodes; a scanning electrode driving circuit for sequentially selecting said scanning electrodes of said dot matrix display part; a signal electrode driving circuit for applying a selected signal electrode voltage or a predetermined signal electrode voltage insufficient for selection to said signal electrodes of said dot matrix display part in accordance with information to be displayed; first circuit means for applying said predetermined signal electrode voltage to one electrode of an opposed pair of electrodes which constitute said fixed pattern display part or said segment display part; and second circuit means for applying said selected or predetermined signal electrode voltages to the other electrode of said opposed pair of electrodes which constitute said fixed pattern display part or said segment display part in accordance with the information to be displayed.
Claim 5
Dependent Claim
244 words
A liquid crystal display device comprising: a liquid crystal panel which is provided with a dot matrix display part composed of a plurality of picture elements which are constituted as a dot matrix by intersections of scanning electrodes arranged in a striped pattern and signal electrodes also arranged in a striped pattern and opposed to said scanning electrodes, and a fixed pattern display part composed of at least one electrode arranged in a pattern that represents information and at least one electrode opposed to said electrode arranged in said pattern or a segment display part composed of a plurality of segment electrodes constituting said pattern and at least one electrode opposed to said segment electrodes; a scanning electrode driving circuit for sequentially selecting said scanning electrodes of said dot matrix display part; a signal electrode driving circuit for applying a selected signal electrode voltage or a predetermined signal electrode voltage insufficient for selection to said signal electrodes of said dot matrix display part in accordance with information to be displayed; first circuit means for applying said predetermined signal electrode voltage to one electrode of an opposed pair of electrodes which constitute said fixed pattern display part or said segment display part; and second circuit means for applying said selected or predetermined signal electrode voltages to the other electrode of said opposed pair of electrodes which constitute said fixed pattern display part or said segment display part in accordance with the information to be displayed.
Claim 6
Dependent Claim
105 words
A liquid crystal display device according to claim 3, wherein said selected signal electrode voltage is alternately V 111 and V 112 with a predetermined period, said predetermined signal electrode voltage is alternately V 121 and V 122 with said predetermined period, and V.sub.121 =V.sub.111 +2/a V.sub.0 V.sub.122 =V.sub.112 -2/a V.sub.0 where V 0 is an amplitude of an alternating voltage applied across a liquid crystal layer at a selected picture element, a is an arbitrary constant larger than 3, and V 111 and V 112 are arbitrary values under the condition that V 111 ≠-1/a V 0 and V 112 ≠-1/a V 0 .
References Cited (Backward Citations)
US3738099A
Cited
US4224615A
Cited
DE3036861A1
Cited
US4390872A
Cited
US4412214A
Cited
JPS57161522A
Cited
GB2119994A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-08-16 | 1992-02-15 | 1992-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-16 | 1996-02-15 | 1996-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-16 | 2000-02-15 | 2000-08-16 | $7700.00 | Window Closed / Lapsed |