Weighted frame rate control with dynamically variable driver bias voltage for producing high quality grayscale shading on matrix displays
US6184854A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 10, 1995 |
| Grant date | Feb 6, 2001 |
| Priority date | — |
| Expiry date | Jul 10, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2330/028
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system for improving the grayshading of matrix displays that effect grayshading by frame rate control (i.e., temporal dithering) includes a computer program which dynamically controls the bias voltage of the electrodes that define the pixels of the display. Per frame rate control principles, an image is established by a plurality of sequentially displayed frames, with the energization of the pixels of the frames being dithered so that the frames together establish a desired grayshading for the image. In accordance with the present invention, the electrode bias voltage to the display is dynamically varied for each frame and/or row to provide for an increased number of grayshades vis-a-vis frame rate control systems that have a constant bias voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.