LIQUID CRYSTAL DISPLAY DEVICE
Document Type and Number:
Japanese Patent JP3897121
PROBLEM TO BE SOLVED: To remove voltage variation of an OFF-setting power source due to an influence of a load current.
SOLUTION: Constitution wherein the voltage of the OFF setting power source VGL turning OFF a thin-film transistor varies according to the change of the voltage of a VCOM is equipped with a 3rd capacitor C3 where the output of a voltage follower 16 is led to one terminal and VGL is outputted from the other terminal and a 3rd voltage dividing circuit 13 which applies the center voltage of the VGL to the other terminal of the 3rd capacitor C3, and a bias voltage applied to an input terminal 151 of a DC amplifying circuit 15 by a 1st voltage dividing circuit 11 is set to a voltage within a range wherein the output impedance of the voltage follower 16 is not raised even when the voltage outputted from the voltage follower 16 is one of two kinds of voltages.
January 05, 2007
November 30, 2004
FUNAI ELECTRIC CO LTD
G09G3/36; G02F1/133; G09G3/20; G09G3/36; G02F1/13; G09G3/20