Electronic system for driving liquid crystal displays
US5739803A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 24, 1994 |
| Grant date | Apr 14, 1998 |
| Priority date | — |
| Expiry date | Jan 24, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2310/0291
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A novel electronic apparatus for driving passive x-y addressed liquid crystal displays (LCDs) and having improved display performance is disclosed and claimed. This apparatus is comprised of row driving integrated circuits capable of driving row lines of the LCD with a pattern of voltages corresponding to the basis vectors of a linear transform matrix. Column driver circuits containing analog CMOS pixel memory store video information and compute the linear transform of the pixel matrix. High voltage amplifier circuits to drive the column lines with voltages corresponding to the linear transform of the pixel matrix columns can be monolithically integrated with the transform computation circuitry. The LCD screen inherently performs the inverse transform and displays the desired pixel matrix. The speed and contrast of the LCD are improved, allowing the display of video rate images on passive LCD screens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.