Patent ID: 8446379

Claim:
A liquid crystal display, comprising: a data line for delivering a data signal or a readout signal; a sensing unit directly connected to the data line for outputting the readout signal, the sensing unit comprising: a readout transistor comprising a first end directly connected to the data line, a gate end directly connected to a first gate line, and a second end; a first storage capacitor comprising a first end directly connected to the second end of the readout transistor and a second end for receiving a first bias voltage; a sensing transistor comprising a first end directly connected to the second end of the readout transistor, a gate end for receiving the first bias voltage, and a second end for receiving a second bias voltage; and a second storage capacitor directly connected between the first and second ends of the sensing transistor; a pixel unit directly connected to the data line for receiving the data signal; the first gate line, directly connected to the sensing unit, for delivering a first gate signal employed to control the sensing unit; a second gate line, directly connected to the pixel unit, for delivering a second gate signal employed to control the pixel unit; a source driver for providing the data signal; a readout signal processing unit for performing a signal processing operation on the readout signal; and a switch unit comprising a first end directly connected to the source driver, a second end directly connected to the readout signal processing unit, and a third end directly connected to the data line, the switch unit being employed to directly connect the third end with either the first end or the second end.