US4952032A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Display device
Assignee: Canon Inc
•
Filing: 1988-03-29
•
Granted: 1990-08-28
•
Expires: 2008-03-29
Abstract
Abstract A display control unit is combined with a display device including scanning and signal electrodes and a display element sandwiched between the scanning and signal electrodes and includes a key or the like for setting drive waveforms for driving the scanning and/or signal electrodes prior to drive timings of the scanning and signal electrodes. In the display device, a ratio of a voltage applied to an intersection between a selected scanning line and a selected information signal line to a voltage applied to an intersection between a non-selected scanning line and a selected information signal line is variably changed in accordance with a temperature change.
Inventors
- 👤 Hiroshi Inoue
- 👤 Tadashi Mihara
- 👤 Atsushi Mizutome
- 👤 Osamu Taniguchi
- 👤 Yoshihiro Onitsuka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:09
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3611; G09G3/3696; G09G3/3622; G09G3/3629; 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: 11
Claim 1
Independent Claim
182 words
A liquid crystal display device comprising: scanning and information signal lines; a liquid crystal element comprising a ferroelectric liquid crystal sandwiched between said scanning and information signal lines; means for sequentially selecting said scanning lines and applying an information signal to said information signal lines in synchronism with an application of a scanning signal to said selected scanning line; memory means for storing applied voltage data adapted to apply voltage to an intersection of a scanning line and a signal line in accordance with a temperature change; and control means operating in accordance with a temperature change, for varying a ratio of a voltage applied to an intersection of a non-selected scanning line and a selected information signal line to a voltage applied to an intersection of a selected scanning line and a selected information signal line in accordance with the applied voltage data stored in said memory means after display-driving the last scanning line in an effective display area of the device formed by said scanning and information lines, but before display-driving the first scanning line in the effective display area.
Claim 2
Dependent Claim
182 words
A liquid crystal display device comprising: scanning and information signal lines; a liquid crystal element comprising a ferroelectric liquid crystal sandwiched between said scanning and information signal lines; means for sequentially selecting said scanning lines and applying an information signal to said information signal lines in synchronism with an application of a scanning signal to said selected scanning line; memory means for storing applied voltage data adapted to apply voltage to an intersection of a scanning line and a signal line in accordance with a temperature change; and control means operating in accordance with a temperature change, for varying a ratio of a voltage applied to an intersection of a non-selected scanning line and a selected information signal line to a voltage applied to an intersection of a selected scanning line and a selected information signal line in accordance with the applied voltage data stored in said memory means after display-driving the last scanning line in an effective display area of the device formed by said scanning and information lines, but before display-driving the first scanning line in the effective display area.
Claim 3
Dependent Claim
57 words
A device according to claim 1, wherein the voltage applied to said selected scanning line is a voltage of one or the other polarity with respect to the voltage applied to said non-selected scanning line, and the information signal is applied to said information signal lines in synchronism with the voltage of one or the other polarity.
Claim 4
Dependent Claim
26 words
A device according to claim 1, wherein a value of the ratio at a high temperature side is smaller than that at a low temperature side.
Claim 5
Dependent Claim
31 words
A device according to claim 1, wherein an amplitude of the voltage applied to the intersection between the selected scanning and information signal lines is variable in accordance with temperature changes.
Claim 6
Dependent Claim
24 words
A device according to claim 4, wherein the amplitude of the voltage at a high temperature is lower than that at a low temperature.
Claim 7
Dependent Claim
32 words
A device according to claim 1, wherein a pulse width of the voltage applied to the intersection between said selected scanning and information signal lines is variable in accordance with temperature changes.
Claim 8
Dependent Claim
25 words
A device according to claim 6, wherein the pulse width of the voltage at a high temperature is smaller than that at a low temperature.
Claim 9
Dependent Claim
24 words
A device according to claim 1, wherein a predetermined time interval for sequentially applying the scanning signals to said scanning lines is periodically repeated.
Claim 10
Dependent Claim
17 words
A device according to claim 1, wherein the ferroelectric liquid crystal is a chiral smectic liquid crystal.
Claim 11
Dependent Claim
21 words
A device according to claim 9, wherein the chiral smectic liquid crystal is a chiral smectic C- or H-phase liquid crystal.
References Cited (Backward Citations)
US3921162A
Cited
US4057325A
Cited
US4462027A
Cited
US4338600A
Cited
US4655561A
Cited
US4719457A
Cited
US4725129A
Cited
US4778260A
Cited
US4764027A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-08-27 | 1994-02-26 | 1994-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-27 | 1998-02-26 | 1998-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-27 | 2002-02-26 | 2002-08-28 | $7700.00 | Window Closed / Lapsed |