Patent ID: 7940238

Claim:
A pixel structure of a display, comprising: a first data line and a second data line located adjacent thereto; a first gate line and a second gate line located adjacent thereto; a photo element generating a photo signal; a transistor having a first on-off state, a first terminal electrically connected to said second gate line, a second terminal electrically connected to said photo element and a third terminal electrically connected to said second data line; a first switch having a second on-off state; and a second switch having a third on-off state, wherein: said second data line is electrically connected to a data driver on one end thereof and to a readout circuit, having a first input terminal and a second input terminal, on the other end thereof; said second data line is electrically connected to said data driver through said first switch and to said first input terminal of said readout circuit through said second switch; said second input terminal of said readout circuit continuously receives a same fixed negative reference voltage at any time; said second on-off state and said third on-off state are complementary; and whenever said first on-off state is in a first on state and said third on-off state is in a second on state, a difference between said photo signal and said fixed negative reference voltage is read by said readout circuit.