Patent EP0285402A2 successfully refreshed from Google Patents.
EP0285402A2
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EP
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Display device
Assignee: Canon Inc
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Filing: 1988-03-30
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Granted: —
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Expires: 2008-03-30
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 non-selected scanning line and a selected information signal line to a voltage applied to an intersection between a selected scanning line and a selected information signal line is variably changed in accordance with a temperature change detected by a sensor (19E).
Inventors
- 👤 Hiroshi Inoue
- 👤 Tadashi Mihara
- 👤 Atsushi Mizutome
- 👤 Osamu Taniguchi
- 👤 Yoshihiro Onitsuka
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 18:10
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: 20
Claim 1
Independent Claim
48 words
A display control unit combined with a display device including scanning and signal electrodes and a display element sandwiched between said scanning and signal electrodes, comprising means for setting drive waveforms for driving said scanning and/or signal electrodes prior to drive timings of said scanning and signal electrodes.
Claim 2
Dependent Claim
48 words
A display control unit combined with a display device including scanning and signal electrodes and a display element sandwiched between said scanning and signal electrodes, comprising means for setting drive waveforms for driving said scanning and/or signal electrodes prior to drive timings of said scanning and signal electrodes.
Claim 3
Dependent Claim
36 words
A unit according to claim 1, wherein said setting means changes at least one of drive time of said electrodes, drive voltages, and waveforms defining data for defining the drive waveforms to set the drive waveforms.
Claim 4
Dependent Claim
25 words
A unit according to claim 1 or 2, wherein said setting means sets the drive waveforms in accordance with a temperature of said display device.
Claim 5
Dependent Claim
55 words
A unit according to any one of claims 1 to 3, wherein said setting means sets the drive waveforms before display driving of a head line according to the temperature but after display driving of a last line of an effective display area of said display device including said scanning and signal electrodes is completed.
Claim 6
Dependent Claim
28 words
A unit according to any one of claims 1 to 4, wherein said display element comprises an optical modulation element having a bistable function for an electric field.
Claim 7
Dependent Claim
39 words
A unit according to any one of claims 1 to 5, wherein said optical modulation element comprises a ferroelectric liquid crystal element and said display device is arranged such that said ferroelectric liquid crystal element has a memory function.
Claim 8
Dependent Claim
107 words
A liquid display device comprising scanning and information signal lines, a liquid crystal element comprising a ferreoelectric liquid crystal sandwiched between said scanning and information signal lines, and 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, wherein a ratio of a voltage applied to an intersection between a non-selected scanning line and a selected information signal line to a voltage applied to an intersection between a selected scanning line and a selected information signal line is variably changed in accordance with a temperature change.
Claim 9
Dependent Claim
107 words
A liquid display device comprising scanning and information signal lines, a liquid crystal element comprising a ferreoelectric liquid crystal sandwiched between said scanning and information signal lines, and 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, wherein a ratio of a voltage applied to an intersection between a non-selected scanning line and a selected information signal line to a voltage applied to an intersection between a selected scanning line and a selected information signal line is variably changed in accordance with a temperature change.
Claim 10
Dependent Claim
57 words
A device according to claim 7, 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 11
Dependent Claim
26 words
A device according to claim 7, wherein a value of the ratio at a high temperature side is smaller than that at a low temperature side.
Claim 12
Dependent Claim
31 words
A device according to claim 7, 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 13
Dependent Claim
24 words
A device according to claim 10, wherein the amplitude of the voltage at a high temperature is lower than that at a low temperature.
Claim 14
Dependent Claim
32 words
A device according to claim 7, 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 15
Dependent Claim
25 words
A device according to claim 12, wherein the pulse width of the voltage at a high temperature is smaller than that at a low temperature.
Claim 16
Dependent Claim
24 words
A device according to claim 7, wherein a predetermined time interval for sequentially applying the scanning signals to said scanning lines is periodically repeated.
Claim 17
Dependent Claim
17 words
A device according to claim 7, wherein the ferroelectric liquid crystal is a chiral smectic liquid crystal.
Claim 18
Dependent Claim
21 words
A device according to claim 15, wherein the chiral smectic liquid crystal is a chiral smectic C- or H-phase liquid crystal.
Claim 19
Dependent Claim
81 words
A display apparatus comprising a liquid crystal display having rows of scanning electrodes and columns of information electrodes arranged to provide a matrix of picture elements, a drive circuit for supplying pulsed scanning signals to the scanning electrodes and information signals to the information electrodes so that pulsed element signals are provided at the picture elements, means for detecting the temperature of the display, and means for controlling the pulse strength of the element signals in dependence upon the detected temperature.
Claim 20
Dependent Claim
81 words
A display apparatus comprising a liquid crystal display having rows of scanning electrodes and columns of information electrodes arranged to provide a matrix of picture elements, a drive circuit for supplying pulsed scanning signals to the scanning electrodes and information signals to the information electrodes so that pulsed element signals are provided at the picture elements, means for detecting the temperature of the display, and means for controlling the pulse strength of the element signals in dependence upon the detected temperature.
References Cited (Backward Citations)
No citation records indexed.
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