Patent ID: 9542049
Date: 2017-01-10
CPC Classifications: G06F,G09G

Claim:
1. A touch sensing circuit, comprising: a touch sensing unit, an output control unit and a detection unit; the touch sensing unit is connected with a first control line, a first power source, a second power source and the output control unit, for providing a touch current, and the touch current is transmitted to the output control unit; the output control unit is connected with a second control line, a read-out line, the touch sensing unit and the detection unit, for outputting the touch current to the detection unit through the read-out line; the detection unit is connected with a reference voltage terminal, an output terminal, the read-out line and the output control unit, for detecting significant change in a voltage output by the output control unit, thereby determining a location where a touch occurs, wherein the touch sensing unit comprises: a first transistor, a second transistor, a touch electrode, a first capacitor, and a second capacitor; a second electrode of the first transistor is connected to a first terminal of the first capacitor; a control electrode of the second transistor is connected to the touch electrode, a first electrode of the second transistor is connected to the first power source, and a second electrode of the second transistor is connected to the output control unit; a second terminal of the first capacitor is connected to the touch electrode; and a first terminal of the second capacitor is connected to the touch electrode, and a second terminal of the second capacitor is connected to the second power source.