Patent ID: 7515148

Claim:
A display panel, comprising: a plurality of scan lines, disposed parallel to each other in a first direction; at least one redundancy scan line, disposed parallel to the scan lines; a plurality of data lines, disposed parallel to each other in a second direction crossing over the redundancy scan line and the scan lines; and at least one switching circuit, connected between the redundancy scan line and one of the scan lines, wherein when the display panel enters a compensation mode, the switching circuit is turned on; wherein a plurality of redundancy pixel circuits are disposed at a plurality of points where the data lines and the redundancy scan line cross over, and a plurality of display pixel circuits are disposed at plurality of points where the data lines and the scan lines cross over, wherein each of the display pixel circuits is substantially the same as each of the redundancy pixel circuits, and each of the display pixel circuits comprises: a first transistor, comprising a drain terminal and a gate terminal of the first transistor connected to one of the data lines and one of the scan lines respectively; a second transistor, comprising a gate terminal connected to a source terminal of the first transistor and grounded via a capacitor, and a drain terminal connected to a voltage source; an organic light emitting diode (OLED), comprising an anode terminal connected to a source terminal of the second transistor; a third transistor, comprising a drain terminal connected to a cathode terminal of the OLED and a source terminal connected to ground; a fourth transistor, comprising a drain terminal adapted for outputting a current substantially equal to a current through the OLED, a source terminal connected to ground, and a gate terminal connected to a gate terminal and the drain terminal of the third transistor; and a fifth transistor, comprising a drain terminal connected to the drain terminal of the fourth transistor, and a gate terminal connected to a select signal, wherein a source terminal and the drain terminal of the fifth transistor is turned on or turned off according to the select signal.