Touch circuit, touch detection method, display panel and display device
View Patent ↗The present disclosure generally relates to the field of display technologies and, more particularly, to a touch circuit, a touch detection method, a display panel, and a display device. The touch circuit includes a touch electrode, a touch signal line, and a driving transistor. The driving transistor has a control terminal coupled to the touch electrode, a first terminal receiving a first power signal, and a second terminal coupled to the touch signal line, and is configured to output a current signal to the touch signal line based on a voltage signal of the touch electrode.
1. A touch circuit, comprising:
a touch electrode;
a touch signal line;
a driving transistor having a control terminal coupled to the touch electrode, a first terminal receiving a first power signal, and a second terminal coupled to the touch signal line, and the driving transistor being configured to output a current signal to the touch signal line based on a voltage signal of the touch electrode;
at least one first switching transistor having a control terminal receiving a first control signal, a first terminal coupled to the touch electrode, and a second terminal receiving a second power signal, and configured to charge the touch electrode with the second power signal in response to the first control signal;
a capacitor element having a first terminal coupled to the control terminal of the driving transistor, and a second terminal receiving a second control signal;
at least one second switching transistor having a control terminal receiving a third control signal, a first terminal coupled to the touch electrode, and a second terminal receiving the second power signal, and configured to charge the touch electrode with the second power signal in response to the third control signal, wherein:
the touch circuit is provided on a display panel comprising a gate driving circuit;
the first control signal, the second control signal, and the third control signal share a scan signal provided by the gate driving circuit; and
a driving timing of the second control signal is earlier than that of the third control signal and later than that of the first control signal.
2. A touch detection method for the touch circuit according to claim 1 , comprising:
charging the touch electrode;
converting a voltage signal of the touch electrode into a current signal by using the driving transistor; and
determining a touch position according to the current signal.
3. A display panel comprising a touch circuit and a gate driving circuit, wherein the touch circuit comprises:
a touch electrode;
a touch signal line;
a driving transistor having a control terminal coupled to the touch electrode, a first terminal receiving a first power signal, and a second terminal coupled to the touch signal line, and the driving transistor being configured to output a current signal to the touch signal line based on a voltage signal of the touch electrode;
at least one first switching transistor having a control terminal receiving a first control signal, a first terminal coupled to the touch electrode, and a second terminal receiving a second power signal, and configured to charge the touch electrode with the second power signal in response to the first control signal;
a capacitor element having a first terminal coupled to the control terminal of the driving transistor, and a second terminal receiving a second control signal;
at least one second switching transistor having a control terminal receiving a third control signal, a first terminal coupled to the touch electrode, and a second terminal receiving the second power signal, and configured to charge the touch electrode with the second power signal in response to the third control signal, wherein:
the touch circuit is provided on the display panel;
the first control signal, the second control signal, and the third control signal share a scan signal provided by the gate driving circuit; and
a driving timing of the second control signal is earlier than that of the third control signal and later than that of the first control signal.
4. The display panel according to claim 3 , further comprising a plurality of driving electrodes extending along a first direction and spaced apart from each other along a second direction, wherein:
each of the driving electrodes comprises a plurality of first electrode blocks and second electrode blocks arranged alternately and spaced apart from each other;
the first electrode block is used as the touch electrode; and
the second electrode block is configured to provide a power signal to a driving circuit of the display panel.
5. The display panel according to claim 4 , wherein a plurality of touch circuits coupled to a same one of the driving electrodes share a same touch signal line.
6. The display panel according to claim 4 , wherein a size of each of the touch electrodes in the first direction varies in the second direction.
7. A display device comprising a display panel having a touch circuit and a gate driving circuit, wherein the touch circuit comprises:
a touch electrode;
a touch signal line;
a driving transistor having a control terminal coupled to the touch electrode, a first terminal receiving a first power signal, and a second terminal coupled to the touch signal line, and the driving transistor being configured to output a current signal to the touch signal line based on a voltage signal of the touch electrode;
at least one first switching transistor having a control terminal receiving a first control signal, a first terminal coupled to the touch electrode, and a second terminal receiving a second power signal, and configured to charge the touch electrode with the second power signal in response to the first control signal;
a capacitor element having a first terminal coupled to the control terminal of the driving transistor, and a second terminal receiving a second control signal;
at least one second switching transistor having a control terminal receiving a third control signal, a first terminal coupled to the touch electrode, and a second terminal receiving the second power signal, and configured to charge the touch electrode with the second power signal in response to the third control signal, wherein:
the touch circuit is provided on the display panel;
the first control signal, the second control signal, and the third control signal share a scan signal provided by the gate driving circuit; and
a driving timing of the second control signal is earlier than that of the third control signal and later than that of the first control signal.
8. The display device according to claim 7 , wherein the display panel further comprises a plurality of driving electrodes extending along a first direction and spaced apart from each other along a second direction, wherein:
each of the driving electrodes comprises a plurality of first electrode blocks and second electrode blocks arranged alternately and spaced apart from each other; and
the first electrode block is used as the touch electrode, and the second electrode block is configured to provide a power signal to a driving circuit of the display panel.
9. The display device according to claim 7 , wherein a plurality of touch circuits coupled to a same one of the driving electrodes share a same touch signal line.
10. The display device according to claim 7 , wherein a size of each of the touch electrodes in the first direction varies in the second direction.