Driver integrated circuit for touch sensing and driving method thereof
A driver integrated circuit for touch sensing and a driving method thereof are provided. The driver integrated circuit includes a touch sensing control circuit. The driver integrated circuit is adapted for driving a touch panel with a touch sensor. The touch sensing control circuit is configured to drive the touch panel to execute a first detection operation. The touch sensing control circuit drives the touch panel to execute a scanning operation after receiving a touch signal. After executing the scanning operation, the touch sensing control circuit drives the touch panel to execute a second detection operation. A sampling frequency of the second detection operation is higher than a sampling frequency of the first detection operation.
1. A driver integrated circuit for touch sensing, adapted for driving a touch panel with a touch sensor, wherein the driver integrated circuit comprises:
a touch sensing control circuit, coupled to an application processor, and configured to drive the touch panel to execute a first detection operation,
wherein the touch sensing control circuit receives a touch signal, the touch sensing control circuit drives the touch panel to execute a scanning operation,
wherein after executing the scanning operation, the touch sensing control circuit drives the touch panel to execute a second detection operation, wherein a sampling frequency of the second detection operation is higher than a sampling frequency of the first detection operation.
2. The driver integrated circuit for touch sensing according to claim 1 , wherein when the touch panel executes the second detection operation, the touch sensing control circuit determines whether the touch signal is received,
in response to the touch sensing control circuit receiving the touch signal, the touch sensing control circuit drives the touch panel to execute the scanning operation,
in response to the touch sensing control circuit determining that the touch signal is not received, the touch sensing control circuit drives the touch panel to execute the first detection operation.
3. The driver integrated circuit for touch sensing according to claim 1 , wherein when the touch panel executes the first detection operation, the touch sensing control circuit determines whether the touch signal is received,
in response to the touch sensing control circuit receiving the touch signal, the touch sensing control circuit drives the touch panel to execute the scanning operation.
4. The driver integrated circuit for touch sensing according to claim 1 , wherein after the touch sensing control circuit drives the touch panel to execute the scanning operation, the touch sensing control circuit drives the touch panel to execute an extension operation, wherein the extension operation is for the touch panel to executing two-dimensional scanning during an extended sensing period.
5. The driver integrated circuit for touch sensing according to claim 4 , wherein when the touch panel executes the first detection operation, the application processor outputs a mode signal to the touch sensing control circuit, so that the touch sensing control circuit drives the touch panel to execute the second detection operation, wherein the sampling frequency of the second detection operation is 2 times to 7 times the sampling frequency of the first detection operation, wherein a detection period of the second detection operation is 2 times to 6 times the extended sensing period.
6. The driver integrated circuit for touch sensing according to claim 4 , wherein the scanning operation is for the touch sensing control circuit to drive the touch panel to execute the two-dimensional scanning to generate a touch coordinate signal,
wherein the touch sensing control circuit receives the touch coordinate signal, and then outputs the touch coordinate signal to the application processor.
7. The driver integrated circuit for touch sensing according to claim 4 , wherein the touch panel executes one of the scanning operation and the extension operation, and when the touch sensing control circuit receives the touch signal, the touch sensing control circuit drives the touch panel to execute the scanning operation.
8. The driver integrated circuit for touch sensing according to claim 1 , wherein the first detection operation is for the touch sensing control circuit to drive the touch panel to execute one-dimensional scanning.
9. The driver integrated circuit for touch sensing according to claim 8 , wherein the second detection operation is for the touch sensing control circuit to drive the touch panel to execute the one-dimensional scanning during a high-frequency sampling period.
10. The driver integrated circuit for touch sensing according to claim 9 , wherein when the touch sensing control circuit drives the touch panel to execute the one-dimensional scanning, the touch panel generates the touch signal in response to a touch event on the touch panel, and then outputs the touch signal to the touch sensing control circuit.
11. A driving method, adapted for a driver integrated circuit for touch sensing, wherein the driver integrated circuit is adapted for driving a touch panel with a touch sensor, wherein the driving method comprises:
driving the touch panel through a touch sensing control circuit to execute a first detection operation;
receiving a touch signal through the touch sensing control circuit, and driving the touch panel to execute a scanning operation through the touch sensing control circuit;
driving the touch panel through the touch sensing control circuit to execute a second detection operation after executing the scanning operation, wherein a sampling frequency of the second detection operation is higher than a sampling frequency of the first detection operation.
12. The driving method according to claim 11 , wherein executing the second detection operation through the touch panel comprises:
determining whether the touch signal is received through the touch sensing control circuit;
in response to the touch sensing control circuit receiving the touch signal, driving the touch panel to execute the scanning operation through the touch sensing control circuit;
in response to the touch sensing control circuit determining that the touch signal is not received, driving the touch panel to execute the first detection operation through the touch sensing control circuit.
13. The driving method according to claim 11 , wherein the touch panel executing the first detection operation comprises:
determining whether the touch signal is received through the touch sensing control circuit;
in response to the touch sensing control circuit receiving the touch signal, driving the touch panel to executing the scanning operation through the touch sensing control circuit.
14. The driving method according to claim 11 , wherein after driving the touch panel to execute the scanning operation through the touch sensing control circuit, the method comprises:
driving the touch panel to execute an extension operation through the touch sensing control circuit, wherein the extension operation is for the touch panel to executing two-dimensional scanning during an extended sensing period.
15. The driving method according to claim 14 , further comprising:
outputting a mode signal to the touch sensing control circuit through the application processor when executing the first detection operation through the touch panel;
driving the touch panel through the touch sensing control circuit to execute the second detection operation,
wherein the sampling frequency of the second detection operation is 2 times to 7 times the sampling frequency of the first detection operation,
wherein a detection period of the second detection operation is 2 times to 6 times the extended sensing period.
16. The driving method according to claim 14 , wherein the scanning operation is driving the touch panel to execute the two-dimensional scanning through the touch sensing control circuit to generate a touch coordinate signal;
receiving the touch coordinate signal through the touch sensing control circuit, and then outputting the touch coordinate signal to the application processor.
17. The driving method according to claim 14 , wherein one of the scanning operation and the extension operation is executed through the touch panel, and when the touch signal is received through the touch sensing control circuit, the touch panel is driven through the touch sensing control circuit to execute the scanning operation.
18. The driving method according to claim 11 , wherein the first detection operation is to drive the touch panel to execute one-dimensional scanning through the touch sensing control circuit.
19. The driving method according to claim 18 , wherein the second detection operation is for the touch sensing control circuit to drive the touch panel to execute the one-dimensional scanning during a high-frequency sampling period.
20. The driving method according to claim 19 , wherein driving the touch panel to execute the one-dimensional scanning through the touch sensing control circuit comprises:
generating the touch signal through the touch panel in response to a touch event on the touch panel, and then outputting the touch signal to the touch sensing control circuit.