Patent US5247290A successfully refreshed from Google Patents.
US5247290A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of operation for reducing power, increasing life and improving performance of epids
Assignee: AUO Corp
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Filing: 1991-11-21
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Granted: 1993-09-21
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Expires: 2011-11-21
Abstract
Abstract Method for operating an electrophoretic display panel in a hold mode that reduces power required , increases display life and improves performance which entails applying a voltage to the anode electrode structure during the "hold" mode of operation which is substantially lower in amplitude than the voltage applied to the anode structure during a "write" mode of operation.
Inventors
- 👤 Frank J. Di Santo
- 👤 Denis A. Krusos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:02
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/3433; G09G3/344; G09G3/3446; G09G2310/00; G09G2310/06; G09G2310/061; G09G2330/00; G09G2330/02; G09G2330/021
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
90 words
A method for reducing the power composition of an electrophoretic display in a hold mode having an anode electrode and grid and cathode electrodes at least two of said electrodes forming an X-Y matrix comprising the steps of: applying a positive voltage to the anode electrode which voltage is at least 50 times less than the voltage applied to said anode electrode during a write mode of said display; and operating the grid electrodes of said display at a negative potential with respect to the cathode electrodes of said display.
Claim 2
Independent Claim
90 words
A method for reducing the power composition of an electrophoretic display in a hold mode having an anode electrode and grid and cathode electrodes at least two of said electrodes forming an X-Y matrix comprising the steps of: applying a positive voltage to the anode electrode which voltage is at least 50 times less than the voltage applied to said anode electrode during a write mode of said display; and operating the grid electrodes of said display at a negative potential with respect to the cathode electrodes of said display.
Claim 3
Dependent Claim
29 words
The method for operating an electrophoretic display panel according to claim 1 wherein the positive voltage applied has an value in the range between positive 1.5 and 3.0 volts.
Claim 4
Dependent Claim
28 words
The method according to claim 1 wherein said electrophoretic display further includes a mesh electrode and applying said positive voltage to said mesh electrode during said hold mode.
Claim 5
Dependent Claim
31 words
The method according to claim 3 further including the step of applying an AC voltage to said mesh electrode of a magnitude and frequency to remove pigment particles from said mesh.
Claim 6
Dependent Claim
22 words
The method according to claim 4 wherein said AC voltage has a magnitude of 100 vrms and a frequency of 60 Hz.
Claim 7
Dependent Claim
22 words
The method according to claim 5 wherein said AC voltage is applied to said mesh for a period of about 100 milliseconds.
Claim 8
Dependent Claim
19 words
The method according to claim 6 wherein said AC voltage is applied to said mesh during a "write" mode.
Claim 9
Dependent Claim
19 words
The method according to claim 6 wherein said AC voltage is applied to said mesh after a "write" mode.
References Cited (Backward Citations)
US5053763A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-09-20 | 1997-03-22 | 1997-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-09-20 | 2001-03-22 | 2001-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-09-20 | 2005-03-22 | 2005-09-21 | $7700.00 | Window Closed / Lapsed |