Drive method and drive circuit of display device
US6344839B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 6, 1997 |
| Grant date | Feb 5, 2002 |
| Priority date | — |
| Expiry date | Oct 6, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2320/0266
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a subfield drive method, two subframes of the least brightness are arranged adjacently to each other to select and light up the display device in terms of the change in image brightness in the time axial direction. When, for example, the level of original signal changes from 7 to 8 or from 8 to 7, SF3, SF2, SF1 and SF1 are selected as subframes for level 8, and SF3, F2 and SF1 are selected as subframes for level 7. This prohibiting any continuous lighting or non-lighting at the levels 7 and 8, there is no substantial change in brightness nor degradation of picture quality at that time. Any distortion of moving image (pseudo contour) is removed by the correction circuit 20 having the frame memory 24 that delays by one frame, the correction constant set circuit 26 that outputs correction data, and the adder 28 that adds the correction data to the original image signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.