Touch panel and touch detecting method therefor

Patent metadata

Field	Value
Publication number	US-9703428-B2
Application number	US-201414272430-A
Country	US
Kind code	B2
Filing date	May 7, 2014
Priority date	Jan 27, 2014
Publication date	Jul 11, 2017
Grant date	Jul 11, 2017

Abstract

The present invention discloses a touch panel having a multitude of driving and sensing electrodes and a touch detecting method therefor. The method includes: driving each driving electrode, and detecting a change in coupling capacitance between each driving electrode and each sensing electrode to determine at least one sensing electrode corresponding to a touch position; multiplexing each one of the at least one sensing electrode corresponding to the touch position to be a generated driving electrode, and multiplexing each driving electrode to be a generated sensing electrode; driving the generated driving electrode, and detecting a change in coupling capacitance between the generated driving electrode and each generated sensing electrode to determine at least one driving electrode corresponding to the touch position; driving each driving electrode corresponding to the touch position, and detecting a change in coupling capacitance between each driving electrode and each sensing electrode corresponding to the touch position to determine the touch position.

First claim

What is claimed is:

1. A touch detecting method for a touch panel, wherein the touch panel comprises a plurality of driving electrodes and a plurality of sensing electrodes, the touch detecting method comprising:
driving the plurality of driving electrodes simultaneously, and detecting a first change in a coupling capacitance between one said driving electrode and one said sensing electrode, wherein the first change is used to determine a first-type of sensing electrodes associated with a touch position and a second-type of sensing electrodes not associated with a touch position;
multiplexing the first-type of sensing electrodes associated with the touch position to be generated driving electrodes, and multiplexing each of the plurality of driving electrodes to be a generated sensing electrode, wherein the second-type of sensing electrodes not associated with the touch position are not multiplexed to be generated driving electrodes, wherein a number of the generated driving electrodes is smaller than a number of the generated sensing electrodes;
driving all the generated driving electrodes simultaneously, and detecting a second change in the coupling capacitance between each pair of one said generated driving electrode and one said generated sensing electrode to determine a first-type of drive electrodes associated with the touch position and a second-type of drive electrodes not associated with the touch position; and
sequentially driving the first-type of driving electrodes associated with the touch position, and detecting a third change in coupling capacitance between each pair of one said first-type of driving electrodes and one said first-type of sensing electrodes to determine the touch position, wherein a number of the first-type of driving electrodes is smaller than a number of the plurality of driving electrodes, and wherein a number of the first-type of sensing electrodes is smaller than a number of the plurality of sensing electrodes.

2. The touch detecting method of claim 1 , wherein detecting the first change in the coupling capacitance between each pair of one said driving electrode and one said sensing electrode comprises:
comparing the first change in the coupling capacitance with a predetermined threshold value, wherein when the first change in the coupling capacitance is greater than or equal to the predetermined threshold value, decide that the touch panel is touched; and
determining the first-type of sensing electrodes associated with the touch position and the second-type of sensing electrodes not associated with the touch position according to the first change of the coupling capacitance.

3. The touch detecting method of claim 1 , wherein detecting the second change in the coupling capacitance between one said generated driving electrode and one said generated sensing electrode comprises:
comparing the second change in the coupling capacitance with a predetermined threshold value, wherein when the second change in the coupling capacitance is greater than or equal to the predetermined threshold value, decide that the touch panel is touched; and
determining the first-type of driving electrodes associated with the touch position and the second-type of driving electrodes not associated with the touch position according to the second change in the coupling capacitance.

4. The touch detecting method of claim 1 , wherein detecting the third change in coupling capacitance between each pair of one said first-type of driving electrode and one said first-type of sensing electrode comprises:
comparing the third change in the coupling capacitance with a predetermined threshold value, wherein when the third change in the coupling capacitance is greater than or equal to the predetermined threshold value, decide that the touch panel is touched; and
determining the touch position from the first-type of driving electrodes associated with the touch position and the first-type of sensing electrodes associated with the touch position contributing to the third change.

5. The touch detecting method of claim 1 , further comprising:
grounding all sensing electrodes except the first-type of sensing electrodes associated with the touch position.

6. The touch detecting method of claim 1 , further comprising:
grounding all driving electrodes except for the first-type of driving electrodes associated with the touch position; and
grounding all sensing electrodes except for the first-type of sensing electrodes associated with the touch position.

7. A touch panel comprising a plurality of driving electrodes, a plurality of sensing electrodes, a plurality of driving lines connected with the plurality of driving electrodes, and a plurality of sensing lines connected with the plurality of sensing electrodes, the touch panel comprises:
a control unit comprising an integrated circuitry (IC) being electrically connected with all of the driving lines and all of the sensing lines;
wherein the driving lines are configured to respectively drive the driving electrodes, and the sensing lines are configured to respectively receive sense signals from the sensing electrodes;
wherein the control unit is configured to:
drive the plurality of driving electrodes simultaneously, and detect a first change in a coupling capacitance between one said driving electrode and one said sensing electrode, wherein the first change is used to determine a first-type of sensing electrodes associated with a touch position and a second-type of sensing electrodes not associated with a touch position;
multiplex the first-type of sensing electrodes associated with the touch position to be generated driving electrodes, and multiplex each of the plurality of driving electrodes to be a generated sensing electrode, wherein the second-type of sensing electrodes not associated with the touch position are not multiplexed to be generated driving electrodes, wherein a number of the generated driving electrodes is smaller than a number of the generated sensing electrodes;
drive all the generated driving electrodes simultaneously, and detect a second change in the coupling capacitance between each pair of one said generated driving electrode and each of the one said generated sensing electrode to determine a first-type of drive electrodes associated with the touch position and a second-type of driving electrodes not associated with the touch position; and
sequentially drive the first-type of driving electrodes associated with the touching position, and detect a third change in coupling capacitance between each pair of one said first-type of driving electrode and one said first-type of sensing electrode to determine the touch position, wherein a number of the first-type of driving electrodes is smaller than a number of the plurality of driving electrodes, and wherein a number of the first-type of sensing electrodes is smaller than a number of the plurality of sensing electrodes.

8. The touch panel of claim 7 , wherein the control unit is further configured to:
drive the plurality of driving electrodes simultaneously, and detect the first change in the coupling capacitance between each pair of one said driving electrode and one said sensing electrode;
compare the first change in the coupling capacitance with a predetermined threshold value, wherein when the change in the coupling capacitance is greater than or equal to the predetermined threshold value, decide that the touch panel is touched; and
determine the first-type of sensing electrodes associated with the touch position and second-type of sensing electrodes not associated with the touch position according to the first change of the coupling capacitance.

9. The touch panel of claim 7 , wherein the control unit is further co

Assignees

• Shanghai Avic Optoelectronics
• Tianma Microelectronics Co Ltd

Inventors

• Wang Xiangchun
• Wang Xupeng
• Cheng Jie

Classifications

• G06F3/044 Primary

  by capacitive means · CPC title

• G06F3/0416

  Control or interface arrangements specially adapted for digitisers · CPC title

• G06F3/0443

  using a single layer of sensing electrodes · CPC title

• G06F3/04166 Primary

  Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving (Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184) · CPC title

• G06F3/0446

  using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes · CPC title