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EP0441591A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

A method for driving a liquid crystal panel

Assignee: Seiko Epson Corp
•
Filing: 1991-02-05
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Granted: —
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Expires: 2011-02-05
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Abstract

Abstract The invention provides a method for driving a liquid crystal panel having a plurality of scanning electrodes (Y1 to Y10) and a plurality of signalling electrodes (X1 to X10) intersecting one another to form a dot matrix, the method comprising applying a driving voltage to each dot of a display pattern such that each said display dot is lit or is not lit in every frame of a display period with the frequency of lighting or not lighting each display dot being varied cyclically within the display period for generating a grey scale tone display, and characterised by controlling the application of the driving voltage such that a plurality of the said display dots on each scanning electrode are lit or not lit in phase with one another, and applying a correction to the driving voltage determined according to the form of the display pattern for off setting disturbances generated in the driving voltage.

Inventors

  • 👤 Katsunori Yamazaki

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-09 16:57
CPC Classifications
H; H04; H04N; H04N3/00; H04N3/10; H04N3/12; H04N3/127; G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3611; G09G3/3622; G09G2320/00; G09G2320/02; G09G2320/0209; G09G2320/0247; G09G2320/04; G09G2320/041

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 151 words
A method for driving a liquid crystal panel having a plurality of scanning electrodes (Y1 to Y10) and a plurality of signalling electrodes (X1 to X10) intersecting one another to form a dot matrix, the method comprising applying a driving voltage to each dot of a display pattern such that each said display dot is lit or is not lit in every frame of a display period with the frequency of lighting or not lighting each display dot being varied cyclically within the display period for generating a grey scale tone display, and characterised by controlling the application of the driving voltage such that a plurality of the said display dots on each scanning electrode are lit or not lit in phase with one another, and applying a correction to the driving voltage determined according to the form of the display pattern for off setting disturbances generated in the driving voltage.
Claim 2
Dependent Claim 37 words
A method according to claim 1 characterised in that the step of applying the correction comprises applying a constant correction voltage to the driving voltage for a duration determined according to the form of the display pattern.
Claim 3
Dependent Claim 31 words
A method according to claim 1 or 2 characterised in that the correction is determined according to the difference in the number of display dots lit on successively selected scanning electrodes.
Claim 4
Independent Claim 42 words
A method according to any of claims 1 to 3 characterised in that the correction is determined according to the sum of the display dots lit on successively selected scanning electrodes minus the total number of dots available on any scanning electrode.
Claim 5
Independent Claim 43 words
A method according to any of claims 1 to 4 characterised in that a respective scanning voltage wave form is applied to each scanning electrode for generating the driving voltage, and in that the correction is applied to the scanning voltage wave form.
Claim 6
Dependent Claim 23 words
A method according to claim 5 characterised in that the correction is applied to a non-selection voltage of the scanning voltage wave form.
Claim 7
Independent Claim 43 words
A method according to any of claims 1 to 4 characterised in that a respective signalling voltage wave form is applied to each signalling electrode for generating the driving voltage, and in that the correction is applied to the signalling voltage wave form.
Claim 8
Dependent Claim 155 words
In a driving method for a liquid crystal panel, wherein each of a plurality of display dots of a liquid crystal panel of a dot matrix with said display dots constructed of a plurality of scanning electrodes (Y1 to Y10) and a plurality of signalling electrodes (X1 to X10) intersecting each other is lighted or kept from lighting at every frame, and with a term consisting of said frames as one period, a frequency of lighting or keeping from lighting said each display dot cyclically within the one period is changed to a tone display, characterised in that phases of cycles for lighting or non-lighting of said each display dot within said one period are equalised at every display dot on said each scanning electrode, a driving wave form of said liquid crystal panel is changed according to a display pattern such as character, graphic form or the like displayed by said liquid crystal panel.

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