US3938136A
Expired / Lapsed
US
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Method and device for driving a matrix type liquid crystal display element
Assignee: Hitachi Ltd
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Filing: 1974-01-04
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Granted: 1976-02-10
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Expires: 1994-01-04
Abstract
Abstract A method and device for driving a matrix type liquid crystal display element, wherein an alternating voltage -/+1/6V O of one-sixth times as great as a selected voltage VO is applied to a non-selected X line, an alternating voltage +/-1/6V O opposite in phase to the alternating voltage applied to the non-selected X line is applied to a non-selected Y line, an alternating voltage +/-1/2VO opposite in phase to the alternating voltage applied to the non-selected X line is applied to a selected X line, and an alternating voltage -/+1/2VO opposite in phase to the alternating voltage applied to the selected X line is applied to a selected Y line, whereby an alternating voltage of +/- VO is applied to a selected dot at an intersection of the selected X and Y lines.
Inventors
- 👤 Hideaki Kawakami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:24
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3611; G09G3/3674; G09G3/3622
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
202 words
A method for driving a matrix type liquid crystal display element driven by the predetermined number of X lines and the predetermined number of Y lines, comprising the step of applying to a non-selected X line an alternating voltage ∓1/6V 0 of one-sixth times as great as a voltage V 0 required for rendering the liquid crystal opaque, the step of applying to a non-selected Y line an alternating voltage ±1/6V 0 opposite in phase to the alternating voltage applied to the non-selected X line, the step of applying to a selected X line an alternating voltage ±1/2V 0 opposite in phase to the alternating voltage applied to the non-selected X line, and the step of applying to a selected Y line an alternating voltage ∓1/2V 0 opposite in phase to the alternating voltage applied to the selected X line, whereby an alternating voltage of ±V 0 is applied to a selected dot at an intersection of the selected X and Y lines to render the selected dot opaque, and an alternating voltage having an absolute amplitude value of 1/3 V 0 is applied to the dots other than said selected dot to prevent cross talk between the X and Y lines.
Claim 2
Independent Claim
202 words
A method for driving a matrix type liquid crystal display element driven by the predetermined number of X lines and the predetermined number of Y lines, comprising the step of applying to a non-selected X line an alternating voltage ∓1/6V 0 of one-sixth times as great as a voltage V 0 required for rendering the liquid crystal opaque, the step of applying to a non-selected Y line an alternating voltage ±1/6V 0 opposite in phase to the alternating voltage applied to the non-selected X line, the step of applying to a selected X line an alternating voltage ±1/2V 0 opposite in phase to the alternating voltage applied to the non-selected X line, and the step of applying to a selected Y line an alternating voltage ∓1/2V 0 opposite in phase to the alternating voltage applied to the selected X line, whereby an alternating voltage of ±V 0 is applied to a selected dot at an intersection of the selected X and Y lines to render the selected dot opaque, and an alternating voltage having an absolute amplitude value of 1/3 V 0 is applied to the dots other than said selected dot to prevent cross talk between the X and Y lines.
Claim 3
Dependent Claim
42 words
A method according to claim 1, wherein the X lines are scanned in a time division fashion by periodically scanning each one of the X lines as the selected X line while scanning the other X lines as the non-selected X line.
Claim 4
Independent Claim
197 words
A device for driving a matrix type liquid crystal display element driven by the predetermined number of X lines and the predetermined number of Y lines, comprising means for applying to a non-selected X line an alternating voltage ∓1/6V 0 of one-sixth times as great as a voltage V 0 required for rendering the liquid crystal opaque, means for applying to a non-selected Y line an alternating voltage ±1/6V 0 opposite in phase to the alternating voltage applied to the non-selected X line, means for applying to a selected X line an alternating voltage ±1/2V 0 opposite in phase to the alternating voltage applied to the non-selected X line, and means for applying to a selected Y line an alternating voltage ∓1/2V 0 opposite in phase to the alternating voltage applied to the selected X line, whereby an alternating voltage of ±V 0 is applied to a selected dot at an intersection of the selected X and Y lines to render the selected dot opaque, and an alternating voltage having an absolute amplitude value of 1/3V 0 is applied to the dots other than said selected dot to prevent cross talk between the X and Y lines.
Claim 5
Independent Claim
197 words
A device for driving a matrix type liquid crystal display element driven by the predetermined number of X lines and the predetermined number of Y lines, comprising means for applying to a non-selected X line an alternating voltage ∓1/6V 0 of one-sixth times as great as a voltage V 0 required for rendering the liquid crystal opaque, means for applying to a non-selected Y line an alternating voltage ±1/6V 0 opposite in phase to the alternating voltage applied to the non-selected X line, means for applying to a selected X line an alternating voltage ±1/2V 0 opposite in phase to the alternating voltage applied to the non-selected X line, and means for applying to a selected Y line an alternating voltage ∓1/2V 0 opposite in phase to the alternating voltage applied to the selected X line, whereby an alternating voltage of ±V 0 is applied to a selected dot at an intersection of the selected X and Y lines to render the selected dot opaque, and an alternating voltage having an absolute amplitude value of 1/3V 0 is applied to the dots other than said selected dot to prevent cross talk between the X and Y lines.
Claim 6
Dependent Claim
146 words
A device according to claim 3, further comprising a first voltage generating circuit for generating an alternating voltage of ±1/2V 0 , a second voltage generating circuit for generating an alternating voltage of ∓1/6V 0 opposite in phase to the alternating voltage of ±1/2V 0 , an X line selecting circuit for selecting the X lines, an X line driving switch unit for selecting outputs from said first and second voltage generating circuits in response to an output from said X line selecting circuit to apply the selected output to a corresponding X line, a Y line selecting circuit for selecting the Y lines, and a Y line driving switch unit for selecting phase-inverted voltages of outputs from said first and second voltage generating circuits in response to an output from said Y line selecting circuit to apply the selected output to a corresponding Y line.
Claim 7
Dependent Claim
46 words
A device according to claim 3, further comprising means for scanning the X lines in a time division fashion so as to periodically scan each one of the X lines as the selected X line while scanning the other X lines as the non-selected X line.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-09 | 1979-08-11 | 1980-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-09 | 1983-08-11 | 1984-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-09 | 1987-08-11 | 1988-02-10 | $7700.00 | Window Closed / Lapsed |