Addressing liquid crystal cells using bipolar data strobe pulses
US4728947A · kind A · utility
25Cited by
22References
12Claims
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Assignee
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Key dates
| Filing date | Apr 2, 1986 |
| Grant date | Mar 1, 1988 |
| Priority date | — |
| Expiry date | Apr 2, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2320/0209
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of addressing a matrix addressed ferroelectric liquid crystal cell is described that uses parallel entry of balanced bipolar data pulses on one set of electrodes to co-operate with serial entry of unipolar strobe pulses on the other set of electrodes. Data entry is preceded with blanking (erasing) pulses applied to the strobe lines. The polarity of the strobing and blanking pulses is periodically reversed to maintain charge balance in the long term.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.