Switched mode digital logic method, system and apparatus for directly driving LCD glass
US6683587B2 · kind B2 · utility
12Cited by
7References
46Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 31, 2001 |
| Grant date | Jan 27, 2004 |
| Priority date | — |
| Expiry date | Jan 11, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2320/041
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A digital circuit having a plurality of digital outputs coupled to backplane(s) and segments of a LCD glass in combination with a software program functions as a “switched mode” LCD driver. Alternating in polarity but equal in magnitude RMS voltage pulses are applied between segments and backplane(s) of the LCD glass. The voltage amplitude and time duration of these pulses determine whether a LCD segment is opaque or clear and the overall contrast of the LCD.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.