Title:
REFERENCE VOLTAGE GENERATION CIRCUIT FOR DISPLAYING GRAY SCALE AND LIQUID CRYSTAL DISPLAY DEVICE USING THE SAME
Document Type and Number:
Japanese Patent JP3495960
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To alter a γ-correction characteristic according to characteristics of a liquid crystal material and a liquid crystal panel.
SOLUTION: Resister elements R0-R7 have resistance ratios for γ-correction and generates γ-corrected intermediate voltages based on the voltage across both input terminals V0, V64. γ-correction adjusting circuits 42 adjust the γ- corrected intermediate voltages upward or downward based on the data for adjustment latched by a data latch circuit 43. In such a manner, the γ-correction characteristic can be altered according to the characteristics of the liquid crystal material and liquid crystal panel without modifying a design of a source driver, by providing the data latch circuit 43 with adjustment data in accordance with the characteristics of the liquid crystal material and liquid crystal panel.
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Inventors:
Tomoaki Nakao
Application Number:
JP35145999A
Publication Date:
February 09, 2004
Filing Date:
December 10, 1999
Export Citation:
Assignee:
Sharp Corporation
International Classes:
G02F1/133; G09G3/20; G09G3/36; H04N5/66; (IPC1-7): G09G3/36; G09G3/20; H04N5/66
Domestic Patent References:
| JP798577A | ||||
| JP973283A | ||||
| JP3259115A | ||||
| JP6348235A | ||||
| JP8172549A |
Attorney, Agent or Firm:
Aoyama Ryo (1 person outside)