TOUCH POSITIONING METHOD FOR TOUCH DISPLAY DEVICE, AND TOUCH DISPLAY DEVICE

• US 20160195998A1
• Filed: 10/24/2014
• Published: 07/07/2016
• Est. Priority Date: 08/18/2014
• Status: Active Grant

• Current Assignee: Beijing BOE Optoelectronics Technology Co Ltd. (BOE Technology Group Co., Ltd.), BOE Technology Group Co., Ltd.
• Original Assignee: Beijing BOE Optoelectronics Technology Co Ltd. (BOE Technology Group Co., Ltd.), BOE Technology Group Co., Ltd.
• Inventors: BAI, Jian, SUN, Wei, MENG, Zhaohui
• Granted Patent: US 9,703,421 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G06F 2203/04104 Multi-touch detection in digitiser, i.e. details about the simultaneous detection of a plurality of touching locations, e.g. multiple fingers or pen and finger
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04182 Filtering of noise external to the device and not generated by digitiser components
• CPC Class Codes: G06F 3/044 by capacitive means

Abstract

The present disclosure provides a touch positioning method for a touch display device, and the touch display device. When it is detected that a touch operation has been made on a touch panel, whether or not the touch operation is effective is determined. When the touch operation is effective, coordinate information about a touch point are sampled multiple times, so as to acquire a plurality of initial coordinates of the touch point. A grouping calculation is performed on the plurality of initial coordinates of the touch point, so as to determine final coordinates of the touch point.

Claims

1. A touch positioning method for a touch display device, comprising steps of:

when it is detected that a touch operation has been made on a touch panel, determining whether or not the touch operation is effective;

when the touch operation is effective, sampling coordinate information about a touch point multiple times, so as to acquire a plurality of initial coordinates of the touch point; and

performing a grouping calculation on the plurality of initial coordinates of the touch point, so as to determine final coordinates of the touch point.

2. The touch positioning method according to claim 1, wherein the step of, when it is detected that the touch operation has been made on the touch panel, determining whether or not the touch operation is effective comprises:

when the touch operation has been made, acquiring a count change value for a channel capacitance corresponding to a touch region; and

when a difference between a maximum value of the count change value and an original reference value is greater than a first threshold, determining that the touch operation is effective, the original reference value being an average value of a plurality of channel capacitances obtained within a predetermined time period before the touch operation, and the first threshold being a predetermined percentage of the original reference value.

3. The touch positioning method according to claim 1, wherein the step of performing the grouping calculation on the plurality of initial coordinates of the touch point so as to determine the final coordinates of the touch point comprises:

dividing horizontal coordinates and longitudinal coordinates of the initial coordinates into N groups, respectively, so as to obtain N groups of classified coordinates, respectively, N being divisible by the number of sampling times of coordinate information about the touch point;

for the N groups of classified coordinates of horizontal coordinates and for the N groups of classified coordinates of longitudinal coordinates, performing, respectively, steps of;

calculating an average value of each group of classified coordinates;

calculating a difference between the average values of any two groups of classified coordinates, and acquiring an absolute value of the difference;

determining two groups of classified coordinates corresponding to a minimum absolute value of the difference; and

determining an average value of the initial coordinates recorded in the two groups of classified coordinates as a corresponding component of the final coordinates.

4. The touch positioning method according to claim 3, wherein the step of performing the grouping calculation on the plurality of initial coordinates of the touch point so as to determine the final coordinates of the touch point further comprises:

determining a relation between the absolute value of the difference and a second threshold, and when the absolute value of the difference is less than or equal to the second threshold, performing the subsequent step of determining the two groups of classified coordinates corresponding to the minimum absolute value of the difference.

5. The touch positioning method according to claim 4, wherein the number of sampling times is 9, N is 3 and the second threshold is 3.

6. The touch positioning method according to claim 2, wherein for a mutual-capacitive touch panel, the channel capacitance is a coupling capacitance at a position where a touch driving electrode overlaps a touch sensing electrode, and for a self-capacitive touch panel, the channel capacitance is a capacitance of a sensing unit itself at a certain potential.

7. The touch positioning method according to claim 2, wherein the predetermined time period is a time period for 20 frames before the touch operation.

8. The touch positioning method according to claim 2, wherein the first threshold is 5% to 30% of the original reference value.

9. A touch display device, comprising:

a determination module configured to, when it is detected that a touch operation has been made on a touch panel, determine whether or not the touch operation is effective;

an acquisition module configured to, when the touch operation is effective, sample coordinate information about a touch point multiple times, so as to acquire a plurality of initial coordinates of the touch point; and

a calculation module configured to perform a grouping calculation on the plurality of initial coordinates of the touch point, so as to determine final coordinates of the touch point.

10. The touch display device according to claim 9, wherein the determination module comprises:

an acquisition unit configured to, when the touch operation has been made, acquire a count change value for a channel capacitance corresponding to a touch region; and

a first determination unit configured to, when a difference between a maximum value of the count change value and an original reference value is greater than a first threshold, determine that the touch operation is effective, the original reference value being an average value of a plurality of channel capacitances obtained within a predetermined time period before the touch operation, and the first threshold being a predetermined percentage of the original reference value.

11. The touch display device according to claim 10, wherein the calculation module comprises:

a grouping unit configured to divide horizontal coordinates and longitudinal coordinates of the initial coordinates into N groups, respectively, so as to obtain N groups of classified coordinates, respectively, N being divisible by the number of sampling times of coordinate information about the touch point;

a first calculation unit configured to an average value of each group of classified coordinates;

a second calculation unit configured to calculate a difference between the average values of any two groups of classified coordinates, and acquire an absolute value of the difference;

a second determination unit configured to determine two groups of classified coordinates corresponding to a minimum absolute value of the difference; and

a third determination unit configured to determine an average value of the initial coordinates recorded in the two groups of classified coordinates as a corresponding component of the final coordinates.

12. The touch display device according to claim 11, wherein the calculation module further comprises:

a fourth determination unit configured to determine a relation between the absolute value of the difference and a second threshold, and when the absolute value of the difference is less than or equal to the second threshold, trigger the second determination unit to determine the two groups of classified coordinates corresponding to the minimum absolute value of the difference.

13. The touch display device according to claim 12, wherein the fourth determination unit is further configured to, when all the absolute values of the differences are greater than a second threshold, determine that the initial coordinates in the groups of classified coordinates as ineffective data, and abandon the ineffective data.

14. The touch display device according to claim 12, wherein the second threshold is 3.