Invention Grant
- Patent Title: Gradation display reference voltage generating circuit and liquid crystal driving device
- Patent Title (中): 梯度显示参考电压发生电路和液晶驱动装置
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Application No.: US11447098Application Date: 2006-06-06
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Publication No.: US07659875B2Publication Date: 2010-02-09
- Inventor: Eisaku Miyazaki
- Applicant: Eisaku Miyazaki
- Applicant Address: JP Osaka
- Assignee: Sharp Kabushiki Kaisha
- Current Assignee: Sharp Kabushiki Kaisha
- Current Assignee Address: JP Osaka
- Agency: Harness, Dickey & Pierce, P.L.C.
- Priority: JP2005-166688 20050607
- Main IPC: G09G3/36
- IPC: G09G3/36 ; G09G5/00 ; G09G5/10 ; G06F3/038
Abstract:
In a gradation display reference voltage generating circuit, first reference voltages (VH0 to VH63) produced by resistors for positive polarity (RH0 to RH64) of a first ladder circuit in a first reference voltage producing section (LDH) are output from reference voltage output terminals (T0 to T63), respectively, at the positive polarity drive, while second reference voltages (VL0 to VL63) produced by resistors for negative polarity (RL0 to RL64) of a second ladder circuit in a second reference voltage producing section (LDL) are output from the reference voltage outputs (T0 to T63), respectively, at the negative polarity drive. A resistance ratio of the resistors for positive polarity (RH0 to RH64) is different from a resistance ratio of the resistors for negative polarity (RL0 to RL64).
Public/Granted literature
- US20060274005A1 Gradation display reference voltage generating circuit and liquid crystal driving device Public/Granted day:2006-12-07
Information query
IPC分类:
