发明名称 |
Liquid crystal display device |
摘要 |
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 (2n+1) first gradation voltages, a selector for selecting first gradation voltages adjacent to each other out of (2n+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 (2n+1) first gradation voltages unchanged, and a second gradation voltage generator for generating and outputting one of 2m-n gradation voltages dividing first gradation voltages adjacent to each other into 2m-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.
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申请公布号 |
US6232941(B1) |
申请公布日期 |
2001.05.15 |
申请号 |
US19980165742 |
申请日期 |
1998.10.05 |
申请人 |
HITACHI, LTD.;HITACHI DEVICE ENGINEERING CO., LTD. |
发明人 |
ODE YUKIHIDE;OGURA AKIRA;AGATA KENTARO;KUROKAWA KAZUNARI;FUJIOKA TAKAHIRO;KATAYANAGI HIROSHI;GOTO MITSURU |
分类号 |
G02F1/133;G09G3/36;(IPC1-7):G09G3/36 |
主分类号 |
G02F1/133 |
代理机构 |
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