Patent US1986298A successfully refreshed from Google Patents.
Patent EP0424030A2 successfully refreshed from Google Patents.
EP0424030A2
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Method of driving a liquid crystal display
Assignee: Panasonic Holdings Corp
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Filing: 1990-10-11
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Granted: —
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Expires: 2010-10-11
Abstract
Abstract In a method of driving a liquid crystal matrix panel, the number of shifts of a voltage applied to each signal electrode from the ON level to the OFF level and vice versa is minimized in variation so that the variation in the polarity inversion (or frequency) of a (driving) voltage applied to a corresponding pixel can be controlled. Accordingly, the disturbing effect of electrode resistance and liquid crystal capacitance will be reduced and thus, the uniformity of display will be ensured.
Inventors
- 👤 Yoshinori Kobayashi
- 👤 Yoshihiro Gohara
- 👤 Shozo Fujiwara
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 03:28
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3611; G09G3/3685; G09G3/3692; G09G3/3622; G09G2320/00; G09G2320/02; G09G2320/0209; G09G3/2007; G09G3/2014
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
135 words
A method of driving a liquid crystal display for use with a liquid crystal panel having a liquid crystal material interposed between a pair of substrates incorporating a signal electrode array and a scanning electrode array respectively which are in turn arranged for constituting pixels at intersecting points therebetween, the signal electrodes array being adapted for receiving ON and OFF voltages for lighting on and off a corresponding pixel respectively, characterized in that a first mode in which a period of applying either the ON or OFF voltage is allocated to the beginning part of one scanning period and a second mode in which the period of applying either the ON or OFF voltage is allocated to the end part of one scanning period occur alternately at intervals of a specific number of scanning periods.
Claim 2
Independent Claim
135 words
A method of driving a liquid crystal display for use with a liquid crystal panel having a liquid crystal material interposed between a pair of substrates incorporating a signal electrode array and a scanning electrode array respectively which are in turn arranged for constituting pixels at intersecting points therebetween, the signal electrodes array being adapted for receiving ON and OFF voltages for lighting on and off a corresponding pixel respectively, characterized in that a first mode in which a period of applying either the ON or OFF voltage is allocated to the beginning part of one scanning period and a second mode in which the period of applying either the ON or OFF voltage is allocated to the end part of one scanning period occur alternately at intervals of a specific number of scanning periods.
Claim 3
Dependent Claim
33 words
A method according to claim 1, wherein the period of ON voltage application in the scanning period is varied corresponding to a level of intermediate gradation for exhibiting a display of intermediate gradation.
Claim 4
Dependent Claim
20 words
A method according to claim 1, wherein said first and second modes are altered at intervals of one scanning period.
Claim 5
Dependent Claim
34 words
A method according to claim 1, wherein the display of intermediate gradation is executed with the use of illuminated and not-illuminated fields in combination, a plurality of which being employed as a display unit.
Claim 6
Dependent Claim
31 words
A method according to Claim 1, wherein the polarity inversion of a voltage applied to a pixel is carried out one time during the scanning period regardless of the display data.
Claim 7
Dependent Claim
37 words
A method according to Claim 2, wherein a period of applying ON or OFF voltage to the signal electrode array is provided at the beginning or end part of the scanning period regardless of the display data.
References Cited (Backward Citations)
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