Patent ID: 8390655

Claim:
A method for driving an active matrix liquid crystal display device for converting an input data into a new data by generating two different gamma signals in a sub-pixel to obtain a target gamma signal, to obtain a dark color gray scale signal, wherein each sub-pixel comprises: a first pixel; a second pixel; a first thin film transistor coupled between the first pixel and a source line, having a gate coupled to a gate line; an electrostatic capacitor coupled between the first pixel and the gate line; and a second thin film transistor and a third thin film transistor connected in series, coupled between the second pixel and a signal line, wherein a gate of the second thin film transistor is coupled to the gate line and a gate of the third thin film transistor is coupled to the source line, wherein the first pixel is controlled to switch on/off by the first thin film transistor and the second pixel is controlled to switch on/off by the second thin film transistor and the third thin film transistor, thereby generating the two different gamma signals for the first pixel and the second pixel, the method comprising: turning on the gate line; setting a voltage of the source line to a low voltage level; setting the voltage of the source line from the low voltage level to a high voltage level; reversing a voltage of the signal line; setting the voltage of the source line from the high voltage level to the low voltage level and setting a voltage of the second pixel to a voltage level that is equal to the reversed voltage of the signal line, so as to obtain a black color display state for the second pixel; and setting the voltage of the source line from the low voltage level to the high voltage level and fixing the voltage of the second pixel that has been set to the voltage level.