Patent ID: 7876291
Filing Date: 2011-01-25
Classification: G09G

Abstract:
1. A drive device for driving a display panel, comprising: an output stage circuit, including an output circuit connected with a scanning electrode of the display panel, and a drive circuit including a selector and shift register for controlling the output circuit, wherein the output stage circuit is driven by a high side logic voltage and a low side logic voltage, the high side logic voltage has an amplitude between a high power source voltage and a high ground voltage, the low side logic voltage has an amplitude between a low power source voltage and a low ground voltage, and the high power source voltage and the high ground voltage are higher than the low power source voltage and the low ground voltage, respectively, wherein the drive circuit includes a first drive circuit for low side use and a second drive circuit for high side use, which respectively control the low side and high side of the output circuit, the first drive circuit for low side use being driven by the low side logic voltage and the second drive circuit for high side use being driven by the high side logic voltage, wherein one of the first and second drive circuits includes a level shifter circuit for sharing one of a high side logic signal and a low side logic signal, wherein the level shifter circuit is constituted by first, second, third and fourth P-channel MOSFETs, and first and second N-channel MOSFETs, the source and substrate of the first and second P-channel MOSFETs are respectively connected with the high side power source, the drain outputs of the first and second P-channel MOSFETs are respectively connected with the source and substrate of the third and fourth P-channel MOSFETs, and the drain outputs of the third and fourth P-channel MOSFETs are respectively connected with the source and substrate of the first and second N-channel MOSFETs.