Patent US5233446A successfully refreshed from Google Patents.
US5233446A
Expired / Lapsed
US
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Display device
Assignee: Canon Inc
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Filing: 1991-01-16
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Granted: 1993-08-03
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Expires: 2011-01-16
Abstract
Abstract A display control unit is combined with a display device including X and Y side electrodes and a display element sandwiched between the X and Y side electrodes. The display control unit includes a plurality of lines for supplying voltages having different values to the X and Y side electrodes, a switch for connecting the lines with the electrodes or disconnecting the lines from the electrodes, and a unit for controlling the switch within a selection period of the X or Y side electrodes.
Inventors
- 👤 Hiroshi Inoue
- 👤 Hideo Kanno
- 👤 Atsushi Mizutome
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:00
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3611; G09G3/3674; G09G3/3681; G09G3/3622; G09G3/3629; G09G3/3685; G09G3/3692; G09G3/3696; 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: 8
Claim 1
Independent Claim
209 words
Display control apparatus comprising: a display device provided with scanning electrodes in a horizontal direction and signaling electrodes in a vertical direction separated from each other by a predetermined gap distance, with liquid crystal being filled in the gap between said scanning electrodes and said signaling electrodes; means for generating a signal which determines one horizontal scanning interval for said display device; scanning switch means, operating in response to a signal from said signal generating means, for applying a plurality of scanning drive voltages to said scanning electrodes for respective n-divided periods of said horizontal scanning interval; signaling switch means, operating in response to a signal from said signal generating means, for applying a plurality of signaling drive voltages to said signaling electrodes for respective n-divided periods of said horizontal scanning interval; scanning drive voltage supply means for applying a first predetermined referential drive voltage and first positive and negative drive voltages to said scanning electrodes, with ratios in voltage difference of the first positive and negative drive voltages to the first predetermined referential drive voltage being the same; and control means for controlling said display device with the scanning drive voltage supplied from said scanning switch means and the signaling drive voltage supplied from said signaling switch means.
Claim 2
Dependent Claim
209 words
Display control apparatus comprising: a display device provided with scanning electrodes in a horizontal direction and signaling electrodes in a vertical direction separated from each other by a predetermined gap distance, with liquid crystal being filled in the gap between said scanning electrodes and said signaling electrodes; means for generating a signal which determines one horizontal scanning interval for said display device; scanning switch means, operating in response to a signal from said signal generating means, for applying a plurality of scanning drive voltages to said scanning electrodes for respective n-divided periods of said horizontal scanning interval; signaling switch means, operating in response to a signal from said signal generating means, for applying a plurality of signaling drive voltages to said signaling electrodes for respective n-divided periods of said horizontal scanning interval; scanning drive voltage supply means for applying a first predetermined referential drive voltage and first positive and negative drive voltages to said scanning electrodes, with ratios in voltage difference of the first positive and negative drive voltages to the first predetermined referential drive voltage being the same; and control means for controlling said display device with the scanning drive voltage supplied from said scanning switch means and the signaling drive voltage supplied from said signaling switch means.
Claim 3
Dependent Claim
56 words
Display control apparatus according to claim 1, further comprising: signaling drive voltage supply means for applying a second predetermined referential drive voltage and second positive and negative drive voltages to said signaling electrodes, with ratios in voltage difference of the second positive and negative drive voltages to the second predetermined referential drive voltage being the same.
Claim 4
Dependent Claim
25 words
Display control apparatus according to claim 1, wherein said liquid crystal filled in the gap of said display device has a memory in bistable states.
Claim 5
Dependent Claim
34 words
Display control apparatus according to claim 1, wherein at least one of said scanning switch means and said signaling switch means switches the drive voltage corresponding to a drive state of said display device.
Claim 6
Dependent Claim
242 words
Display control apparatus comprising: a display device provided with scanning electrodes in a horizontal direction and signaling electrodes in a vertical direction separated from each other by a predetermined gap distance, with liquid crystal being filled in the gap between said scanning electrodes and said signaling electrodes; scanning drive voltage supply means for applying a first predetermined referential drive voltage and first positive and negative drive voltages to said scanning electrodes, with ratios in voltage difference of the first positive and negative drive voltages to the first predetermined referential drive voltage being the same; signaling drive voltage supply means for applying a second predetermined referential drive voltage and second positive and negative drive voltages to said signaling electrodes, with ratios in voltage difference of the second positive and negative drive voltages to the second predetermined referential drive voltage being the same; 1H signal generating means for generating a signal which determines one horizontal scanning interval for said display device; 1H/n signal generating means operating in response to the signal generated from said 1H signal generating means for generating signals for respective n-divided periods of said horizontal scanning interval, with n being a positive integer; and control means, operating in response to the signals generated from said 1H/n signal generating means, for controlling said display device by switching the scanning drive signal supplied from said scanning drive voltage supply means and the signaling drive voltage supplied from said signaling drive voltage supply means.
Claim 7
Dependent Claim
242 words
Display control apparatus comprising: a display device provided with scanning electrodes in a horizontal direction and signaling electrodes in a vertical direction separated from each other by a predetermined gap distance, with liquid crystal being filled in the gap between said scanning electrodes and said signaling electrodes; scanning drive voltage supply means for applying a first predetermined referential drive voltage and first positive and negative drive voltages to said scanning electrodes, with ratios in voltage difference of the first positive and negative drive voltages to the first predetermined referential drive voltage being the same; signaling drive voltage supply means for applying a second predetermined referential drive voltage and second positive and negative drive voltages to said signaling electrodes, with ratios in voltage difference of the second positive and negative drive voltages to the second predetermined referential drive voltage being the same; 1H signal generating means for generating a signal which determines one horizontal scanning interval for said display device; 1H/n signal generating means operating in response to the signal generated from said 1H signal generating means for generating signals for respective n-divided periods of said horizontal scanning interval, with n being a positive integer; and control means, operating in response to the signals generated from said 1H/n signal generating means, for controlling said display device by switching the scanning drive signal supplied from said scanning drive voltage supply means and the signaling drive voltage supplied from said signaling drive voltage supply means.
Claim 8
Dependent Claim
25 words
Display control apparatus according to claim 5, wherein said liquid crystal filled in the gap of the display device has a memory in bistable states.
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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) | 1996-08-02 | 1997-02-01 | 1997-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-02 | 2001-02-01 | 2001-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-02 | 2005-02-01 | 2005-08-03 | $7700.00 | Window Closed / Lapsed |