US3976362A
Expired / Lapsed
US
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Method of driving liquid crystal matrix display device
Assignee: Hitachi Ltd
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Filing: 1974-10-15
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Granted: 1976-08-24
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Expires: 1994-10-15
Abstract
Abstract In a method of driving with a one-line-at-a-time scanning system a liquid crystal matrix display device in which the picture elements are defined by liquid crystal cell portions formed between the scanning and the signal electrodes arranged in the form of a matrix, the amplitude of the voltage applied to non-selected cells along a selected scanning electrode is made different from the amplitude of the voltage applied to non-selected cells along a selected signal electrode; the amplitude of the voltage (bias voltage) applied to non-selected cells along the selected signal electrode is made equal to the amplitude of the voltage applied to the remaining non-selected cells; and the bias voltage is determined depending on the number of the scanning electrodes, so that the operation margin is further improved.
Inventors
- 👤 Hideaki Kawakami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:28
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3611; G09G3/3622
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
111 words
A method of driving with a one-line-at-a-time scanning system a liquid crystal matrix display device in which the picture elements are defined by liquid crystal cell portions formed between the scanning and the signal electrodes arranged in the form of a matrix, characterized in that the amplitude of the DC voltage applied to non-selected cells along a selected scanning electrode is made different from the amplitude of the DC voltage applied to non-selected cells along a selected signal electrode and the amplitude of the DC voltage applied to non-selected cells along the selected signal electrode is made equal to the amplitude of the DC voltage applied to the remaining non-selected cells.
Claim 2
Independent Claim
111 words
A method of driving with a one-line-at-a-time scanning system a liquid crystal matrix display device in which the picture elements are defined by liquid crystal cell portions formed between the scanning and the signal electrodes arranged in the form of a matrix, characterized in that the amplitude of the DC voltage applied to non-selected cells along a selected scanning electrode is made different from the amplitude of the DC voltage applied to non-selected cells along a selected signal electrode and the amplitude of the DC voltage applied to non-selected cells along the selected signal electrode is made equal to the amplitude of the DC voltage applied to the remaining non-selected cells.
Claim 3
Independent Claim
194 words
A method of driving with a one-line-at-a-time scanning system a liquid crystal matrix display device in which the picture elements are defined by liquid crystal cell portions formed between the scanning and the signal electrodes arranged in the form of a matrix, characterized in that the amplitude of the voltage applied to non-selected cells along a selected scanning electrode is made different from the amplitude of the voltage applied to non-selected cells along a selected signal electrode and the amplitude of the voltage applied to non-selected cells along the selected signal electrode is made equal to the amplitude of the voltage applied to the remaining non-selected cells; and in the case where the amplitude of the voltage at the selected cell is V o , the amplitude of the voltage at the non-selected cells along a selected scanning electrode is chosen to be (1/b)V o and the amplitude of the voltage at the non-selected cells along a selected signal electrode and at the remaining non-selected cells to be (1/a)V o , and that the relationship between the constants a and is such that a ≠ b and (a/b) 2 = (a - 2) 2
Claim 4
Independent Claim
194 words
A method of driving with a one-line-at-a-time scanning system a liquid crystal matrix display device in which the picture elements are defined by liquid crystal cell portions formed between the scanning and the signal electrodes arranged in the form of a matrix, characterized in that the amplitude of the voltage applied to non-selected cells along a selected scanning electrode is made different from the amplitude of the voltage applied to non-selected cells along a selected signal electrode and the amplitude of the voltage applied to non-selected cells along the selected signal electrode is made equal to the amplitude of the voltage applied to the remaining non-selected cells; and in the case where the amplitude of the voltage at the selected cell is V o , the amplitude of the voltage at the non-selected cells along a selected scanning electrode is chosen to be (1/b)V o and the amplitude of the voltage at the non-selected cells along a selected signal electrode and at the remaining non-selected cells to be (1/a)V o , and that the relationship between the constants a and is such that a ≠ b and (a/b) 2 = (a - 2) 2
Claim 5
Dependent Claim
70 words
A method as claimed in claim 2, characterized in that with V 11 arbitrarily given, the following relations hold: V.sub.12 = V.sub.11 ±(2/a)V.sub.o, V.sub.21 = V.sub.11 ± V.sub.o, and V.sub.22 = V.sub.11 ± (1/a)V.sub.o, where V 21 and V 22 are the voltages applied to the selected and non-selected scanning electrodes respectively, and V 11 and V 12 are the voltages applied to the selected and non-selected signal electrodes respectively.
Claim 6
Dependent Claim
34 words
A method as claimed in claim 2, characterized in that the constant a is greater than 3 and made approximately equal to √N + 1, where N is the number of the scanning electrodes.
References Cited (Backward Citations)
US3776615A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-24 | 1980-02-23 | 1980-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-24 | 1984-02-23 | 1984-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-24 | 1988-02-23 | 1988-08-24 | $7700.00 | Window Closed / Lapsed |