Apparatus and method for controlling contrast in a dot-matrix liquid crystal display
US6057820A · kind A · utility
9Cited by
9References
32Claims
0Family size
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Key dates
| Filing date | Jun 16, 1998 |
| Grant date | May 2, 2000 |
| Priority date | — |
| Expiry date | Jun 16, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2320/066
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An apparatus and method for controlling the contrast in a dot-matrix liquid crystal display (LCD) is provided wherein the voltages applied to the electrodes is phase shifted. The phase shifted electrode voltages avoids the problem that rows of the dot-matrix LCD may have long periods when the voltage on the front electrode and the back electrode are different polarities so that the contrast of the dot-matrix LCD across the rows is improved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.