Patent US4824212A successfully refreshed from Google Patents.
US4824212A
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Liquid crystal display device having separate driving circuits for display and non-display regions
Assignee: Sharp Corp
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Filing: 1988-03-14
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Granted: 1989-04-25
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Expires: 2008-03-14
Abstract
Abstract A liquid crystal display device comprising a display screen and liquid crystal element-driving circuits. The display screen has an effective display region with a plurality of transparent electrodes on both sides of liquid crystal elements to make characters visible and a non-display region that is the region other than the effective display region. The driving circuits are divided into two groups. One group is for driving the liquid crystal elements in the effective display region to display desired characters, and the other group is for driving the liquid crystal elements in the non-display region to make the non-display region dark or bright.
Inventors
- 👤 Kouki Taniguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:35
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1343; G02F1/134309; G02F1/134336; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3611; G09G3/3622; G09G3/3644; G09G2310/00; G09G2310/02; G09G2310/0232
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
90 words
A liquid crystal display device, comprising: a display section comprising an effective display region having a plurality of transparent electrodes arranged on both sides of liquid crystal elements so as to make characters visible and a non-display region other than said effective display region; and liquid crystal driving means comprising first driving circuits for driving the liquid crystal elements in said effective display region to display desired characters, and second driving circuits for driving the liquid crystal elements in said non-display region to make said non-display region dark or bright.
Claim 2
Dependent Claim
90 words
A liquid crystal display device, comprising: a display section comprising an effective display region having a plurality of transparent electrodes arranged on both sides of liquid crystal elements so as to make characters visible and a non-display region other than said effective display region; and liquid crystal driving means comprising first driving circuits for driving the liquid crystal elements in said effective display region to display desired characters, and second driving circuits for driving the liquid crystal elements in said non-display region to make said non-display region dark or bright.
Claim 3
Dependent Claim
25 words
The liquid crystal display device of claim 1, wherein said display section is of either normally black type or normally white type selectable as desired.
Claim 4
Dependent Claim
38 words
The liquid crystal display device of claim 2, wherein when said display section is of said normally black type, said non-display region is driven to become bright by said second driving circuits of the liquid crystal driving means.
Claim 5
Dependent Claim
32 words
The liquid crystal display device of claim 2, wherein when said display section is of said normally white type, said non-display region is driven to become dark by said second driving circuits.
Claim 6
Dependent Claim
17 words
The liquid crystal display device of claim 1, wherein said non-display region defines said effective display region.
References Cited (Backward Citations)
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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 |