Liquid crystal display device having a gray-scale voltage producing circuit
US6433768B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 20, 1999 |
| Grant date | Aug 13, 2002 |
| Priority date | — |
| Expiry date | Oct 20, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2310/027
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A liquid crystal display device includes plural pixels, video signal lines coupled to the pixels, a video signal line drive circuit, a power supply for supplying a time-varying gray scale voltage, and a display control circuit for supplying N-bit display data and N kinds of time-varying control signals. The video signal line drive circuit includes: plural switching circuits each associated with a respective one of the video signal lines and comprising N switching elements. The N switching elements each select one of the respective one of the N kinds of time control signals and a first fixed voltage in accordance with the display data. The N kinds of time control signals are such pulses as to uniquely determine a time represented by the display data based upon it. Plural logic circuits each associated with the respective video signal lines are supplied with the selected signals from the switching elements, and are configured so as to change state when all the selected signals are the first fixed voltage. The output circuits each associated with a respective one of the video signal lines are configured so as to supply a voltage level of the gray scale voltage at an instant when a cor…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.