CONTROL APPARATUS FOR A TOUCH PANEL AND CONTROL METHOD FOR THE TOUCH PANEL

• US 20150002459A1
• Filed: 06/26/2014
• Published: 01/01/2015
• Est. Priority Date: 06/28/2013
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Kasamatsu, Takehiko, Watanabe, Kyosuke
• Granted Patent: US 10,139,964 B2
• Time in Patent Office: Days
• US Class Current: 345/174
• CPC Class Codes: G06F 3/04186 Touch location disambiguation
• CPC Class Codes: G06F 3/0448 Details of the electrode shape, e.g. for enhancing the detection of touches, for generating specific electric field shapes, for enhancing display quality

Abstract

A determination is made, on the basis of an electrostatic capacitance value of an electrostatic sensor provided to electrostatic touch panel and a reference value, whether or not the electrostatic touch panel is operated, and the reference value is modified to be increased in a case where it is determined that the electrostatic touch panel is operated and a variation of the electrostatic capacitance value is higher than or equal to a first threshold.

Claims

1. An apparatus comprising:

a determination unit configured to determine, on the basis of an electrostatic capacitance value of an electrostatic sensor provided to an electrostatic touch panel and a reference value, whether or not the electrostatic touch panel is operated; and

a modifying unit configured to modify the reference value to be increased in a case where it is determined that the electrostatic touch panel is operated by the determination unit and a variation of the electrostatic capacitance value is higher than or equal to a first threshold.

2. The apparatus according to claim 1, wherein the determination unit determines that the electrostatic touch panel is operated in a case where a difference between the electrostatic capacitance value of the electrostatic sensor and the reference value is higher than or equal to a second threshold and determines that the electrostatic touch panel is not operated in a case where the difference is lower than the second threshold.

3. The apparatus according to claim 2, wherein the modifying unit modifies the reference value in a case where the variation of the electrostatic capacitance of the electrostatic sensor is higher than or equal to the first threshold and also the difference between the electrostatic capacitance value of the electrostatic sensor and the reference value is higher than or equal to the second threshold.

4. The apparatus according to claim 2, wherein the first threshold is set as a same value as the second threshold.

5. The apparatus according to claim 2, wherein a value obtained by adding a predetermined value to the second threshold is set as the first threshold.

6. The apparatus according to claim 2, wherein the modifying unit further sets another reference value obtained by adding a predetermined value to the reference value as a new reference value in a case where the difference between the electrostatic capacitance value of the electrostatic sensor and the reference value is lower than a third threshold that is lower than the second threshold.

7. The apparatus according to claim 2, wherein the modifying unit further sets another reference value obtained by subtracting a predetermined value from the reference value as a new reference value in a case where the difference between the electrostatic capacitance value of the electrostatic sensor and the reference value is lower than a third threshold that is lower than the second threshold.

8. The apparatus according to claim 2, wherein

the electrostatic sensor includes a plurality of electrostatic sensor patterns, and

the determination unit determines that the electrostatic touch panel is operated in a case where a number of the electrostatic sensor patterns in which the difference between the electrostatic capacitance value of the electrostatic sensor and the reference value is higher than or equal to a value of the second thresholds is higher than or equal to a predetermined number.

9. The apparatus according to claim 1, wherein the modifying unit modifies the reference value into an electrostatic capacitance value of the electrostatic sensor which is measured in a case where a variation of the electrostatic capacitance value of the electrostatic sensor within a predetermined time becomes higher than or equal to the first threshold.

10. The apparatus according to claim 1, wherein the modifying unit modifies the reference value into a value obtained by adding a predetermined value to an electrostatic capacitance value of the electrostatic sensor which is measured in a case where a variation of the electrostatic capacitance value of the electrostatic sensor within a predetermined time becomes higher than or equal to the first threshold.

11. The apparatus according to claim 1, wherein the electrostatic capacitance, measured for a first time after a power supply of the electrostatic touch panel is turned on, is set as the reference value.

12. The apparatus according to claim 1, further comprising:

a count unit configured to count an operation time in a case where the determination unit determines that the electrostatic touch panel is operated,

wherein the modifying unit performs an update in a case where the operation time counted by the count unit is longer than or equal to a predetermined time.

13. The apparatus according to claim 1, wherein the modifying unit modifies the reference value to be increased in a case where a decrease amount of the electrostatic capacitance value of the electrostatic sensor is higher than or equal to the first threshold.

14. The apparatus according to claim 1, wherein the modifying unit modifies the reference value in a case where a time during which the determination unit determines that the electrostatic touch panel is operated is longer than or equal to a predetermined time.

15. A method comprising:

determining, on the basis of an electrostatic capacitance value of an electrostatic sensor provided to electrostatic touch panel and a reference value, whether or not the electrostatic touch panel is operated; and

modifying the reference value to be increased in a case where it is determined that the electrostatic touch panel is operated and a variation of the electrostatic capacitance value is higher than or equal to a first threshold.

16. A non-transitory computer-readable recording medium storing a program for causing a computer to execute the method according to claim 15.