US4962376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Display control apparatus having a plurality of driving voltage supplying means
Assignee: Canon Inc
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Filing: 1988-03-30
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Granted: 1990-10-09
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Expires: 2008-03-30
Abstract
Abstract A display control unit is combined with a display device including a display element and electrodes for applying an electric field to the display element. The display control unit includes a control unit for changing and setting a plurality of voltages applied to the electrodes such that one of the plurality of voltages is fixed, and differences between the fixed voltage and other voltages are kept at a predetermined ratio.
Inventors
- 👤 Hiroshi Inoue
- 👤 Hideo Kanno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:23
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3611; G09G3/3696; G09G3/3622; G09G3/3629; G09G3/3644; G09G3/3674; G09G3/3681; G09G3/3685; G09G3/3692; G09G2310/00; G09G2310/02; G09G2310/0232; G09G2310/0243; G09G2310/0245; G09G2310/04; G09G2310/06; G09G2310/061; G09G2310/062; G09G2310/065; G09G2320/00; G09G2320/02; G09G2320/0209; G09G2320/04; G09G2320/041; G09G2330/00; G09G2330/02; G09G2330/021
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
253 words
A display control apparatus comprising: display means including a scan electrode disposed in a first direction and a signal electrode disposed in a second direction substantially orthogonal to the first direction, with said signal electrode being separated from said scan electrode by a predetermined distance, and a gap between said scan electrode and signal electrode being filled with liquid crystal; driving voltage supplying means for supplying a driving voltage; scan side driving voltage supplying means for generating plus and negative driving voltages on the basis of the driving voltage supplied by said driving voltage supplying means, wherein a ratio of a potential difference between the plus driving voltage and a predetermined reference voltage and a potential difference between the negative driving voltage and a predetermined reference voltage is the same, and for supplying the generated plus and negative driving voltages to said scan electrode; signal side driving voltage supplying means for generating plus and negative driving voltages on the basis of the driving voltage supplied by said driving voltage supplying means, wherein a ratio of a potential difference between the plus driving voltage and a predetermined reference voltage and a potential difference between the negative driving voltage and the reference voltage is the same, and for supplying the generated plus and negative driving voltages to said signal electrode; and control means for controlling said display means so as to change the driving voltage supplied by said scan side driving voltage supplying means and the driving voltage supplied by said driving voltage supplying means.
Claim 2
Dependent Claim
253 words
A display control apparatus comprising: display means including a scan electrode disposed in a first direction and a signal electrode disposed in a second direction substantially orthogonal to the first direction, with said signal electrode being separated from said scan electrode by a predetermined distance, and a gap between said scan electrode and signal electrode being filled with liquid crystal; driving voltage supplying means for supplying a driving voltage; scan side driving voltage supplying means for generating plus and negative driving voltages on the basis of the driving voltage supplied by said driving voltage supplying means, wherein a ratio of a potential difference between the plus driving voltage and a predetermined reference voltage and a potential difference between the negative driving voltage and a predetermined reference voltage is the same, and for supplying the generated plus and negative driving voltages to said scan electrode; signal side driving voltage supplying means for generating plus and negative driving voltages on the basis of the driving voltage supplied by said driving voltage supplying means, wherein a ratio of a potential difference between the plus driving voltage and a predetermined reference voltage and a potential difference between the negative driving voltage and the reference voltage is the same, and for supplying the generated plus and negative driving voltages to said signal electrode; and control means for controlling said display means so as to change the driving voltage supplied by said scan side driving voltage supplying means and the driving voltage supplied by said driving voltage supplying means.
Claim 3
Dependent Claim
41 words
A display control apparatus according to claim 1, further comprising temperature detecting means for detecting a temperature of said display means, wherein said control means changes the driving voltage on the basis of the temperature detected by said temperature detecting means.
Claim 4
Dependent Claim
28 words
A display control apparatus according to claim 1, wherein said liquid crystal is a liquid crystal with a memory function having a bistable function for an electric field.
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) | 1993-10-08 | 1994-04-09 | 1994-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-08 | 1998-04-09 | 1998-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-08 | 2002-04-09 | 2002-10-09 | $7700.00 | Window Closed / Lapsed |