Patent US3891306A successfully refreshed from Google Patents.
US3891306A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for driving liquid cell display panel
Assignee: Hitachi Ltd
•
Filing: 1973-07-20
•
Granted: 1975-06-24
•
Expires: 1993-07-20
Abstract
Abstract A method for driving a liquid cell in a scanning liquid cell display panel in which the liquid cell is interposed between two scanning electrode groups comprises the step of applying a DC voltage and an AC voltage having a frequency above the limiting frequency of the liquid crystal to said two scanning electrode groups during a period of semi-selection of the scanning while applying said DC voltage thereto during a period of full selection, an amplitude ratio of said AC to DC voltages during said period of semi-selection ranging from 1 to 2.
Inventors
- 👤 Isamu Mitomo
- 👤 Tetsunori Kaji
- 👤 Masakazu Fukushima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:12
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3611; G09G3/3622
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
168 words
A method for driving a liquid cell display panel including a plurality of first electrodes arranged in parallel to each other, a plurality of second electrodes respectively intersecting with each of said first electrodes and arranged in parallel to each other, and liquid cells of nematic type disposed at the respective intersections of said first electrodes with said second electrodes, said method comprising the step of applying a voltage to a predetermined liquid cell of said liquid cells through said first and second electrodes to drive said predetermined liquid cell, wherein said voltage includes a DC voltage and a high frequency voltage superimposed thereon during periods of two types of semi-selection of said liquid cell and said voltage includes at least a DC voltage during a period of full selection thereof, an amplitude ratio of said high frequency voltage to DC voltage during the period of at least one of said two types of semi-selection being in the range of at least 1 and not more than 2.
Claim 2
Independent Claim
168 words
A method for driving a liquid cell display panel including a plurality of first electrodes arranged in parallel to each other, a plurality of second electrodes respectively intersecting with each of said first electrodes and arranged in parallel to each other, and liquid cells of nematic type disposed at the respective intersections of said first electrodes with said second electrodes, said method comprising the step of applying a voltage to a predetermined liquid cell of said liquid cells through said first and second electrodes to drive said predetermined liquid cell, wherein said voltage includes a DC voltage and a high frequency voltage superimposed thereon during periods of two types of semi-selection of said liquid cell and said voltage includes at least a DC voltage during a period of full selection thereof, an amplitude ratio of said high frequency voltage to DC voltage during the period of at least one of said two types of semi-selection being in the range of at least 1 and not more than 2.
Claim 3
Dependent Claim
20 words
A driving method as set forth in claim 1, wherein a low frequency voltage is substituted for said DC voltage.
Claim 4
Dependent Claim
44 words
A driving method as set forth in claim 1 including applying a DC voltage having a high frequency voltage superimposed thereon to a first electrode or a second electrode associated with a respective liquid cell during the period of semi-selection of said liquid cell.
Claim 5
Dependent Claim
33 words
A driving method as set forth in claim 1, wherein the DC voltage and the high frequency voltage are applied during the entire period of semi-selection so as to provide said amplitude ratio.
Claim 6
Dependent Claim
24 words
A driving method as set forth in claim 1, wherein the amplitude ratio of the high frequency voltage to the DC voltage is 2.
Claim 7
Dependent Claim
32 words
A method as set forth in claim 1, wherein the amplitude ratio of high frequency voltage to DC voltage is in the range of more than 1 and not more than 2.
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) | 1978-06-23 | 1978-12-23 | 1979-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-23 | 1982-12-23 | 1983-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-23 | 1986-12-23 | 1987-06-24 | $7700.00 | Window Closed / Lapsed |