Patent ID: 7737940

Claim:
A liquid crystal display, comprising: a source driver generating a data signal voltage; a gate driver generating a scan signal; a plurality of pixel units arranged in a matrix, each pixel unit comprising a switch transistor for conducting the data signal voltage when turned on by the scan signal, and a liquid crystal capacitor having one end coupled to the switch transistor and the other end coupled to a common voltage end, the liquid crystal capacitor adjusting the arrangement of liquid crystal molecules disposed therein according to the data signal voltage; a plurality of detecting circuits, each electrically connected to one pixel unit, each detecting circuit comprising: a first transistor coupled to a constant voltage terminal and conducting a predetermined constant voltage from the constant voltage terminal when turned on by a control signal; a sensor unit coupled to the first transistor for generating a dynamic voltage; a second transistor coupled to the sensor unit for generating a dynamic current according to the dynamic voltage; and a third transistor coupled to the second transistor for conducting the dynamic current when turned on; and a decision unit coupled to the plurality of detecting circuits for determining the source of the dynamic currents by comparing all the dynamic currents output by the plurality of detecting circuits.