Liquid crystal display device
US6232941A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Oct 5, 1998 |
| Grant date | May 15, 2001 |
| Priority date | — |
| Expiry date | Oct 5, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/804
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A liquid crystal display device is capable of generating gradation voltages for multilevel gradation, such as 256-level gradation, without increasing the chip size of video signal line driving means. The video signal line driving means for applying video signal voltages for multilevel gradation in accordance with m-bit display data is provided with a first gradation voltage generator for generating (2.sup.n +1) first gradation voltages, a selector for selecting first gradation voltages adjacent to each other out of (2.sup.n +1) first gradation voltages generated by the first gradation voltage generator in accordance with the bit values of high-order n bits of the m-bit display data, while keeping the magnitude relationship between the (2.sup.n +1) first gradation voltages unchanged, and a second gradation voltage generator for generating and outputting one of 2.sup.m-n gradation voltages dividing first gradation voltages adjacent to each other into 2.sup.m-n voltages from the first gradation voltages adjacent to each other selected by the selector in accordance with the bit values of low-order (m-n) bits of the display data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.