Portable electronic device and touch control chip and touch control method thereof
A portable electronic device includes a touch sensing circuit, a substrate, a conductive layer on the substrate, a resistance measuring circuit and a control circuit. The conductive layer includes a plurality of sensing electrodes. The touch sensing circuit determines whether a touch point occurs according to a plurality of capacitance changes of the plurality of sensing electrodes. The resistance measuring circuit measures a resistance value of at least a part of the conductive layer. The control circuit determines whether the touch sensing circuit should enter a correction mode according to the resistance value.
1. A portable electronic device, comprising:
a substrate;
a conductive layer, formed on the substrate, comprising a plurality of sensing electrodes;
a touch sensing circuit, determining whether a touch point occurs according to a plurality of capacitance changes of the plurality of sensing electrodes;
a resistance measuring circuit, measuring a resistance value of at least a part of the conductive layer; and
a control circuit, determining whether the touch sensing circuit should enter a correction mode according to the resistance value,
wherein when the touch sensing circuit enters the correction mode, the control circuit causes at least one sensing result outputted by the touch sensing circuit to be omitted or to cause the touch sensing circuit to stop outputting the sensing result.
2. The portable electronic device according to claim 1 , wherein the resistance measuring circuit periodically measures the resistance value of the conductive layer.
3. A portable electronic device, comprising:
a substrate;
a conductive layer, formed on the substrate, comprising a plurality of sensing electrodes;
a touch sensing circuit, determining whether a touch point occurs according to a plurality of capacitance changes of the plurality of sensing electrodes;
a resistance measuring circuit, measuring a resistance value of at least a part of the conductive layer; and
a control circuit, determining whether the touch sensing circuit should enter a correction mode according to the resistance value,
wherein each time the touch sensing circuit detects an abnormal touch pattern, the resistance measuring circuit starts measuring the resistance value of the conductive layer.
4. The portable electronic device according to claim 1 , wherein when the resistance value satisfies a significant change condition, the control circuit causes the touch sensing circuit to enter the correction mode.
5. The portable electronic device according to claim 1 , wherein in the correction mode, the control circuit requests the touch sensing circuit to re-evaluate a capacitance threshold for determining whether a touch point occurs.
6. The portable electronic device according to claim 1 , wherein the control circuit further determines whether to cause the touch sensing circuit to enter a mist mode according to a mutual capacitance value of the plurality of sensing electrodes.
7. The portable electronic device according to claim 6 , wherein when the touch sensing circuit enters the mist mode, a capacitance threshold for determining whether a touch point occurs is increased.
8. The portable electronic device according to claim 6 , wherein when the touch sensing mode enters the mist mode, the control circuit dynamically adjusts a capacitance threshold according to which the touch sensing circuit determines whether a touch point occurs according to the plurality of capacitance values of the plurality of sensing electrodes.
9. The portable electronic device according to claim 1 , wherein the conductive layer comprises a guard ring surrounding the sensing electrodes, and the resistance measuring circuit measures a resistance value of the guard ring.
10. The portable electronic device according to claim 1 , wherein the conductive layer is an indium tin oxide (ITO) structure.
11. A control method, applied to a portable electronic device comprising a touch sensing circuit and a conductive layer, the conductive layer comprising a plurality of sensing electrodes, the touch sensing circuit determining whether a touch point occurs according to a plurality of capacitance changes of the plurality of sensing electrodes, the control method comprising:
a) measuring a resistance value of at least a part of the conductive layer;
b) determining whether the touch sensing circuit should enter a correction mode according to the resistance value; and
determining whether to cause the touch sensing circuit to enter a mist mode according to a mutual capacitance value of the plurality of sensing electrodes.
12. The control method according to claim 11 , wherein step (a) is periodically performed.
13. The control method according to claim 11 , wherein each time the touch sensing circuit detects an abnormal touch pattern, step (a) is performed.
14. The control method according to claim 11 , wherein step (b) comprises:
causing the touch sensing circuit to enter the correction mode when the resistance value satisfies a significant change condition.
15. The control method according to claim 11 , further comprising:
in the correction mode, re-evaluating a capacitance threshold according to which the touch sensing circuit determines whether a touch point occurs.
16. The control method according to claim 11 , further comprising:
in the correction mode, causing at least one sensing result outputted by the touch sensing circuit to be omitted or causing the touch sensing circuit to stop outputting the sensing result.
17. The control method according to claim 11 , further comprising:
when the touch sensing circuit enters the mist mode, increasing a capacitance threshold for determining whether a touch point occurs.
18. The control method according to claim 11 , further comprising:
when the touch sensing circuit enters the mist mode, dynamically adjusting a capacitance threshold according to which the touch sensing circuit determines whether a touch point occurs according to the plurality of capacitance values of the plurality of sensing electrodes.