Methods for driving electrophoretic display so as to avoid persistent unidirectional current through TFT switches
US7952558B2 · kind B2 · utility
22Cited by
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24Claims
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Key dates
| Filing date | Sep 28, 2007 |
| Grant date | May 31, 2011 |
| Priority date | — |
| Expiry date | Mar 30, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2310/0256
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Certain types of displays such as electrophoretic displays tend to deteriorate if their pixel units are persistently driven by currents flowing in only one direction for the purpose of maintaining (i.e. refreshing) a relatively constant optical state. A first method pulses the pixel unit with a drive pulse of opposed polarity but duration too short (i.e. less than 1/25 second) for a viewer to notice. A second method pulses the pixel unit with a drive pulse of opposed polarity but magnitude to small to effect change in optical state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.