GB2103003A
Expired / Lapsed
GB
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Improvements in liquid crystal displays and methods of driving
Assignee: Suwa Seikosha KK
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Filing: 1982-08-02
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Granted: —
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Expires: 2002-08-02
Abstract
No abstract record available.
Inventors
- 👤 Tomio Sonehara
- 👤 Masami Murata
- 👤 Tadashi Ota
Bibliographic Details
Application Number
—
Jurisdiction
GB
Data Source
google_patents
Last Synchronized
2026-10-25 15:47
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3611; G09G3/367
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
122 words
An electric-optical matrix type liquid crystal display device and a non-linear driving and addressing system therefor wherein the time during which selection of a picture element is effected is shortened and the average value of the driving voltage during non-selected periods is maintained substantially free of variation by dividing the scanning period as herein defined into at least two fine scanning periods as herein defined, the voltage applied during at least one fine scanning period in a scanning period being of one pre-determined level and that applied during other fine scanning periods being of the display signal level, the selecting signal level during each of said other fine scanning periods being reversed with respect to that of the preceding fine scanning period.
Claim 2
Dependent Claim
122 words
An electric-optical matrix type liquid crystal display device and a non-linear driving and addressing system therefor wherein the time during which selection of a picture element is effected is shortened and the average value of the driving voltage during non-selected periods is maintained substantially free of variation by dividing the scanning period as herein defined into at least two fine scanning periods as herein defined, the voltage applied during at least one fine scanning period in a scanning period being of one pre-determined level and that applied during other fine scanning periods being of the display signal level, the selecting signal level during each of said other fine scanning periods being reversed with respect to that of the preceding fine scanning period.
Claim 3
Dependent Claim
19 words
Apparatus as claimed in claim 1 wherein the scanning period is divided into two equal fine 85 scanning periods.
Claim 4
Dependent Claim
20 words
Apparatus as claimed in claim 1 wherein the scanning period is divided into more than two equal fine scanning periods.
Claim 5
Dependent Claim
20 words
Apparatus as claimed in claim 1 wherein the 90 division of the scanning period into fine scanning periods is disparate.
Claim 6
Dependent Claim
31 words
Apparatus as claimed in any of the preceding claims and which is such that the values of the voltage levels in the selection signal for selection or non-selection can be varied.
Claim 7
Dependent Claim
37 words
Apparatus as claimed in any of the preceding claims and which is such that the voltage levels in the display signal for effecting lighting or non- lighting of picture elements in the 100 display can be varied.
Claim 8
Dependent Claim
25 words
Apparatus as claimed in claim 1 wherein the fine scanning periods do not together occupy a whole scanning time but leave a pause period therein.
Claim 9
Dependent Claim
28 words
Apparatus as claimed in any of the preceding claims and including means for effecting voltage or time modulation to enable the apparatus to produce a grey scale display.
Claim 10
Independent Claim
89 words
A method of driving a liquid crystal matrix type electro-optical device by driving means including an element of non-linear characteristics and driving at least one substrate of a liquid crystal display panel by scanning it in two scanning frame periods with signals having alternating current bias, the two frame scanning periods together occupying a scanning period, characterised in that the average of the voltages applied to picture elements in a non-selected period during one frame period are made substantially equal in absolute value for all elements or parts thereof.
Claim 11
Independent Claim
89 words
A method of driving a liquid crystal matrix type electro-optical device by driving means including an element of non-linear characteristics and driving at least one substrate of a liquid crystal display panel by scanning it in two scanning frame periods with signals having alternating current bias, the two frame scanning periods together occupying a scanning period, characterised in that the average of the voltages applied to picture elements in a non-selected period during one frame period are made substantially equal in absolute value for all elements or parts thereof.
Claim 12
Dependent Claim
73 words
A method as claimed in claim 9, wherein all or part of each half-scanning period is equally divided by the number of scanning electrodes to constitute a certain period which is further divided into a plurality of fine scanning periods, the scanning signal applied being at a selecting level in some fine scanning periods during said certain period and a non- selecting level in the remaining fine scanning periods during said certain period.
Claim 13
Dependent Claim
96 words
A method of driving liquid crystal display as claimed in claim 9 or 10, wherein the display signal applied is respectively at lighting level or at nonlighting level in dependence upon whether the picture element is in the ON or OFF condition in a period synchronised with the fine scanning period and said scanning signal is at selecting level, said display signal being respectively at the nonlighting level or at lighting level in converse correspondence with the condition of the picture element in another period synchronized with the remaining fine scanning period in the scanning period.
Claim 14
Dependent Claim
54 words
A method as claimed in claim 9, 10 or 11, wherein the times in which the selecting and the nonselecting levels occur are equal, said selecting level being applied in some of the fine scanning periods produced by dividing the scanning period and said non-selecting level being applied in the remaining fine scanning periods.
Claim 15
Independent Claim
26 words
A method of driving liquid crystal display device as claimed in any of claims 9 to 12, wherein said fine scanning period is divided in half.
Claim 16
Dependent Claim
63 words
Methods of driving matrix type liquid crystal display devices and apparatus for putting such methods into effect substantially as herein described with reference to Figures 7 to 13 inclusive of the accompanying drawings. Printed for Her Majesty's Stationery Office by the Courier Press, Leamington Spa, 1983. Published by the Patent Office, 25 Southampton Buildings, London, WC2A lAY, from which copies may be obtained
Claim 17
Dependent Claim
63 words
Methods of driving matrix type liquid crystal display devices and apparatus for putting such methods into effect substantially as herein described with reference to Figures 7 to 13 inclusive of the accompanying drawings. Printed for Her Majesty's Stationery Office by the Courier Press, Leamington Spa, 1983. Published by the Patent Office, 25 Southampton Buildings, London, WC2A lAY, from which copies may be obtained
References Cited (Backward Citations)
No citation records indexed.
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