US4041481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scanning apparatus for an electrophoretic matrix display panel
Assignee: Panasonic Holdings Corp
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Filing: 1975-10-01
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Granted: 1977-08-09
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Expires: 1995-10-01
Abstract
Abstract A scanning apparatus for an electrophoretic matrix display panel, has a horizontal (X-line) electrode driving circuit to provide a selecting pulse, a vertical (Y-line) electrode driving circuit to provide a data pulse, and an information signal supply means. An electric field is imposed across cells of an electrophoretic suspension layer to change the optical reflective property of the cells in a predetermined sequence after a pause interval by the horizontal and vertical electrode driving circuits. This causes operation of the display panel without cross effect.
Inventors
- 👤 Teruo Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:47
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/3433; G09G3/344; G02; G02F; G02F1/00; G02F1/01; G02F1/165; G02F1/166; G02F1/167; G09G2300/00; G09G2300/06; G09G2310/00; G09G2310/02; G09G2310/0264; G09G2310/0267; G09G2310/027; G09G2310/06; G09G2310/061; G09G2310/063; G09G2310/065; G09G2310/068; G09G2320/00; G09G2320/02; G09G2320/0209
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
237 words
A scanning apparatus for an electrophoretic matrix display panel having opposed spaced X-line and Y-line electrodes and having a multiplicity of display cells located between said X-line and Y-line electrodes, said scanning apparatus comprising an X-line electrode driving circuit adapted to be coupled to said X-line electrodes and having a set of X-line drivers for supplying an X-erasing pulse and a selecting pulse with a pause interval to an X-line electrode, said pause interval being supplied before said selecting pulse is supplied and after said X-erasing pulse is supplied so as to stop the supply of any voltage to said X-line electrode during said pause interval; a Y-line electrode driving circuit adapted to be coupled to said Y-line electrodes and having a set of Y-line drivers for supplying a Y-erasing pulse and a data pulse with a pause interval to a Y-line electrode, said Y-erasing pulse, pause interval and data pulse supplied to said Y-line electrode being synchronized with said X-erasing pulse, pause interval and selecting pulse supplied to said X-line electrode, respectively, so as to stop the supply of any voltage to the display cell at the intersection of said X-line electrode and said Y-line electrode during said pause interval, the voltage difference between said selecting pulse and said data pulse being applied as an information pulse to said display cell; and an information signal supply means coupled to said X-line and Y-line electrode driving circuits.
Claim 2
Dependent Claim
237 words
A scanning apparatus for an electrophoretic matrix display panel having opposed spaced X-line and Y-line electrodes and having a multiplicity of display cells located between said X-line and Y-line electrodes, said scanning apparatus comprising an X-line electrode driving circuit adapted to be coupled to said X-line electrodes and having a set of X-line drivers for supplying an X-erasing pulse and a selecting pulse with a pause interval to an X-line electrode, said pause interval being supplied before said selecting pulse is supplied and after said X-erasing pulse is supplied so as to stop the supply of any voltage to said X-line electrode during said pause interval; a Y-line electrode driving circuit adapted to be coupled to said Y-line electrodes and having a set of Y-line drivers for supplying a Y-erasing pulse and a data pulse with a pause interval to a Y-line electrode, said Y-erasing pulse, pause interval and data pulse supplied to said Y-line electrode being synchronized with said X-erasing pulse, pause interval and selecting pulse supplied to said X-line electrode, respectively, so as to stop the supply of any voltage to the display cell at the intersection of said X-line electrode and said Y-line electrode during said pause interval, the voltage difference between said selecting pulse and said data pulse being applied as an information pulse to said display cell; and an information signal supply means coupled to said X-line and Y-line electrode driving circuits.
Claim 3
Dependent Claim
36 words
A scanning apparatus as claimed in claim 1 wherein the voltage of said information pulse is 3V, and the display cell is supplied with at most a voltage V in the absence of said information pulse.
Claim 4
Dependent Claim
53 words
A scanning apparatus as claimed in claim 1 wherein said X-line and Y-line electrode driving circuits comprise means for supplying all of said X-line and Y-line electrodes with alternating X-erasing pulses and with alternating Y-erasing pulses having the opposite polarity to said alternating X-erasing pulses, respectively, at the start of updating of display.
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) | 1980-08-08 | 1981-02-07 | 1981-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-08 | 1985-02-07 | 1985-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-08 | 1989-02-07 | 1989-08-09 | $7700.00 | Window Closed / Lapsed |