Patent ID: 7432922

Claim:
A source driver for LCD devices, used for driving at least one data line, comprising: at least one driving input for receiving a predetermined voltage level; at least one driving output being electrically connected to the data line and having a first output voltage level; a voltage clamping circuit for clamping the first output voltage level within a range between a first voltage level and a second voltage level, wherein the second voltage level is larger than the first voltage level; a first differential amplifier having two first inputs and a first output, the two first inputs respectively used for receiving the predetermined voltage level from the driving input and the clamped first output voltage level from the driving output, wherein the first differential amplifier is electrically connected to the driving output through the first output for increasing the clamped first output voltage level at the driving output toward the predetermined voltage level while the predetermined voltage level is larger than the clamped first output voltage level; and a second differential amplifier having two second inputs and a second output, the two second inputs respectively used for receiving the predetermined voltage level from the driving input and the clamped first output voltage level from the driving output, wherein the second differential amplifier is electrically connected to the driving output through the second output for decreasing the clamped first output voltage level at the driving output toward the predetermined voltage level while the predetermined voltage level is smaller than the clamped first output voltage level.