US3863221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of driving liquid cell display panel
Assignee: Hitachi Ltd
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Filing: 1973-03-28
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Granted: 1975-01-28
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Expires: 1993-03-28
Abstract
Abstract In case of addressing the predetermined liquid cells of a liquid cell display panel comprising a plurality of parallel X-axis electrodes, a plurality of parallel Y-axis electrodes disposed perpendicular to said X-axis electrodes, and liquid cells disposed at the points where said X-axis electrodes cross said Yaxis electrodes, a D.C. voltage whose polarity is inverted three times during one horizontal scanning period is sequentially and periodically applied to the X-axis electrodes while a D.C. voltage whose polarity is inverted three times only during the predetermined horizontal scanning periods is applied to the Yaxis electrodes, so that the light permeability of the addressed liquid cells may be changed.
Inventors
- 👤 Tetsunori Kaji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:13
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3611; G09G3/3674; G09G3/3681; G09G3/3622
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
225 words
A method of driving a liquid cell display panel having a plurality of X-axis electrodes, a plurality of Y-axis electrodes disposed perpendicular to the X-axis electrodes respectively, and liquid cells disposed respectively at the points where the X-axis electrodes cross the Y-axis electrodes, the method comprising producing a scanning signal voltage having a first voltage portion to be applied to the liquid cell when the liquid cell is addressed and a second voltage portion to be applied to the liquid cell when the liquid cell is not addressed, the polarities of the first and second voltage portions being opposite to each other with respect to a predetermiNed reference level and being inverted every predetermined number of time frames, producing a display signal voltage having a third voltage portion to be applied to the liquid cell when the liquid cell is addressed and a fourth voltage portion to be applied to the liquid cell when the liquid cell is not addressed, the polarities of the third and fourth voltage portions being opposite to each other with respect to the predetermined reference level and being inverted every predetermined number of time frames, and applying the scanning signal voltage to each X-axis electrodes sequentially and periodically while applying the display signal voltage of a predetermined display information to each Y-axis electrode for driving the liquid cell display panel.
Claim 2
Independent Claim
225 words
A method of driving a liquid cell display panel having a plurality of X-axis electrodes, a plurality of Y-axis electrodes disposed perpendicular to the X-axis electrodes respectively, and liquid cells disposed respectively at the points where the X-axis electrodes cross the Y-axis electrodes, the method comprising producing a scanning signal voltage having a first voltage portion to be applied to the liquid cell when the liquid cell is addressed and a second voltage portion to be applied to the liquid cell when the liquid cell is not addressed, the polarities of the first and second voltage portions being opposite to each other with respect to a predetermiNed reference level and being inverted every predetermined number of time frames, producing a display signal voltage having a third voltage portion to be applied to the liquid cell when the liquid cell is addressed and a fourth voltage portion to be applied to the liquid cell when the liquid cell is not addressed, the polarities of the third and fourth voltage portions being opposite to each other with respect to the predetermined reference level and being inverted every predetermined number of time frames, and applying the scanning signal voltage to each X-axis electrodes sequentially and periodically while applying the display signal voltage of a predetermined display information to each Y-axis electrode for driving the liquid cell display panel.
Claim 3
Dependent Claim
44 words
A method according to claim 1, including providing the first voltage portion with a value with respect to the predetermined reference level which is substantially three times as large as the value of the second voltage portion with respect to the predetermined reference level.
Claim 4
Dependent Claim
43 words
A method according to claim 1, wherein the first voltage portion has a value with respect to the predetermined reference level which is substantially three times as large as the value of the fourth voltage portion with respect to the predetermined reference level.
Claim 5
Dependent Claim
43 words
A method according to claim 1, wherein the third voltage portion has a value with respect to the predetermined reference level which is substantially three times as large as the value of the fourth voltage portion with respect to the predetermined reference level.
Claim 6
Dependent Claim
25 words
A method according to claim 1, wherein the first and second voltage portions and the third and fourth voltage portions are inverted each time frame.
Claim 7
Independent Claim
231 words
A system for driving a liquid cell display panel having a plurality of X-axis electrodes, a plurality of Y-axis electrodes disposed perpendicular to the X-axis electrodes, respectively, and liquid cells disposed respectively at the points where the X-axis electrodes cross the Y-axis electrodes, the system comprising means for producing a scanning signal voltage having a first voltage portion to be applied to the liquid cell when the liquid cell is addressed and a second voltage portion to be applied to the liquid cell when the liquid cell is not addressed, the polarities of the first and second voltage portions being opposite to each other with respect to a predetermined reference level and being inverted every predetermined number of time frames, means for producing a display signal voltage having a third voltage portion to be applied to the liquid cell when the liquid cell is addressed and a fourth voltage portion to be applied to the liquid cell when the liquid cell is not addressed, the polarities of the third and fourth voltage portions being opposite to each other with respect to the predetermined reference level and being inverted every predetermined number of time frames, and means for applying the scanning signal voltage to each X-axis electrodes sequentially and periodically while applying the display signal voltage of a predetermined display information to each Y-axis electrode for driving the liquid cell display panel.
Claim 8
Independent Claim
231 words
A system for driving a liquid cell display panel having a plurality of X-axis electrodes, a plurality of Y-axis electrodes disposed perpendicular to the X-axis electrodes, respectively, and liquid cells disposed respectively at the points where the X-axis electrodes cross the Y-axis electrodes, the system comprising means for producing a scanning signal voltage having a first voltage portion to be applied to the liquid cell when the liquid cell is addressed and a second voltage portion to be applied to the liquid cell when the liquid cell is not addressed, the polarities of the first and second voltage portions being opposite to each other with respect to a predetermined reference level and being inverted every predetermined number of time frames, means for producing a display signal voltage having a third voltage portion to be applied to the liquid cell when the liquid cell is addressed and a fourth voltage portion to be applied to the liquid cell when the liquid cell is not addressed, the polarities of the third and fourth voltage portions being opposite to each other with respect to the predetermined reference level and being inverted every predetermined number of time frames, and means for applying the scanning signal voltage to each X-axis electrodes sequentially and periodically while applying the display signal voltage of a predetermined display information to each Y-axis electrode for driving the liquid cell display panel.
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) | 1978-01-27 | 1978-07-29 | 1979-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-27 | 1982-07-29 | 1983-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-27 | 1986-07-29 | 1987-01-28 | $7700.00 | Window Closed / Lapsed |