Patent ID: 8144137
Filing Date: 2012-03-27
Classification: G09G

Abstract:
1. A display panel drive circuit comprising: a first display output terminal to be connected with a data line of a display panel; a first output stage connected with said first display output terminal and configured to generate and output a data signal having positive polarity with respect to a standard voltage level; a second output stage connected with said first display output terminal and configured to generate and output a data signal having negative polarity with respect to said standard voltage level; a first differential amplifier stage receiving a first grayscale voltage associated with a first display data; a second differential amplifier stage receiving a second grayscale voltage associated with a second display data; a first switch stage including a first switch and a second switch for connecting a controlling terminal of said first output stage with one of an output of said first differential amplifier stage and a first voltage level; a second switch stage including a third switch and a fourth switch for connecting a controlling terminal of said second output stage with one of an output of said second differential amplifier stage and a second voltage level; and a control circuit controlling said first and second output stages so that one of said first and second output stages is selectively activated while the other of said first and second output stages is deactivated, wherein: the first switch stage further includes a fifth switch for selectively connecting an output of the first output stage to an input of the first differential amplifier, the second switch stage further includes a sixth switch for selectively connecting an output of the first output stage to an input of the second differential amplifier, the first output stage comprises a first transistor, the second output stage comprises a second transistor, the controlling terminal of the first output stage controls a switching on or off of the first transistor, the controlling terminal of the second output stage controls a switching on or off of the second transistor, the first voltage level is higher than the second voltage level, the first switch connects the output of the first differential amplifier with the controlling terminal of the first output stage during a first time period, the second switch connects the first voltage with the controlling terminal of the first output stage during a second time period, and the fifth switch is on during the first time period and off during the second time period, and the sixth switch is off during the first time period and on during the second time period.