0466506-A2 is referenced by 15 patents and cites 2 patents.

The present invention improves the drop of a contrast, the occurrence of cross-talk and the drop of a response speed by bringing the drive state of an electrooptical display device to theoretical values. In a display device including a display panel having common electrode groups and segment electrode groups, a common electrode drive circuit and a segment electrode drive circuit, the quantity of the current flowing through the display panel through the segment electrode drive circuit is detected by a current detection circuit consisting of a differential amplifier 101 and a resistor Ra and by a current detection circuit consisting of a differential amplifier 102 and the resistor Ra,; and the common electrode drive voltage applied to the common electrode groups through the common electrode drive circuit is controlled by a differential amplifier 103 on the basis of this current detection quantity, whereby the contrast is improve, cross-talk is eliminated, and remarkable effects are obtained.

Title
Electrooptical display device.
Application Number
EP19910306354 19910712
Publication Number
0466506 (A2)
Application Date
July 12, 1991
Publication Date
January 15, 1992
Inventor
Ebihara Heihachiro
JP
Assignee
Citizen Watch
JP
IPC
G09G 03/36
G09G 03/20
G09G 03/36
G09G 03/20
G09G 03/36
G09G 03/20
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