Method and apparatus for operating an electrophoretic display between a display and a non-display mode
US4746917A · kind A · utility
171Cited by
4References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 14, 1986 |
| Grant date | May 24, 1988 |
| Priority date | — |
| Expiry date | Jul 14, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2320/043
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
There is shown a method and apparatus for operating an electrophoretic display. The display is operated in a first mode where essentially it operates as a display having normal DC voltages applied to its electrodes. During a non-display mode, a suitable alternating voltage of a given frequency and magnitude is AC coupled to the anode electrode of the display for a predetermined time interval to cause pigment particles to settle between the anode and cathode whereby the effective life of said display is increased. The transfer of the display mode to the second mode is afforded by suitable switching circuitry.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.