Method of detecting touch point and touch controller

Patent metadata

Field	Value
Publication number	US-11301084-B2
Application number	US-202117213556-A
Country	US
Kind code	B2
Filing date	Mar 26, 2021
Priority date	Jul 20, 2017
Publication date	Apr 12, 2022
Grant date	Apr 12, 2022

Abstract

A method of detecting a touch point and a touch controller is disclosed. The method includes: a touch detection mode is determined according to a first result at an initial time of a detection period (S110), the first result being a touch detection result corresponding to an adjacent detection period prior to the detection period; and a touch point on a touch screen is detected in the touch detection mode (S120), where the touch detection mode includes a single-finger touch detection mode and a multi-finger touch detection mode. A method of detecting a touch point could achieve a balance between power consumption and response speed, and accordingly, improve user experience.

First claim

What is claimed is:

1. A method of detecting a touch point, wherein a touch screen is configured with at least one first channel in a first direction and at least one second channel in a second direction, the first direction and the second direction being perpendicular, and an intersection of the at least one first channel and the at least one second channel being a capacitance node, wherein the method comprises:
determining a touch detection mode according to a first result at an initial time of a detection period, the first result being a touch detection result corresponding to an adjacent detection period prior to the detection period; and
detecting a touch point on a touch screen in the touch detection mode,
wherein the touch detection mode includes a single-finger touch detection mode and a multi-finger touch detection mode;
wherein the single-finger touch detection mode comprises a self-capacitance detection mode and a high speed mutual-capacitance detection mode, the multi-finger touch detection mode comprises a mutual-capacitance detection mode;
wherein the high speed mutual-capacitance detection mode refers to:
acquiring detection data of the at least one first channel in the first direction by transmitting a drive signal simultaneously along the at least one second channel; and acquiring detection data of the at least one second channel in the second direction by transmitting a drive signal simultaneously along the at least one first channel; and
wherein when there is no touch on a touch screen, a length of the detection period is increased to reduce the refresh rate of the touch detection; and when a touch occurs on the touch screen, the length of the detection period is reduced to improve the refresh rate of the touch detection.

2. The method according to claim 1 , wherein the single-finger touch detection mode refers to: determining a touch point on the touch screen by detection data in one direction or by combining detection data in multiple directions; and the multi-finger touch detection mode refers to: determining a touch point on the touch screen by detection data on a plane, wherein the detection data in each of the multiple directions comprises at least one detection data for representing a touch condition in a single direction, and the detection data on the plane comprises at least one detection data for representing a touch condition of planar coordinates.

3. The method according to claim 1 , wherein if the first result is that there is no touch point or one touch point, the determining the touch detection mode according to the first result comprises:
determining the touch detection mode as a single-finger touch detection mode.

4. The method according to claim 3 , wherein the method further comprises:
if only one touch point or no touch point is detected on the touch screen in the single-finger touch detection mode, using a touch detection result corresponding to the single-finger touch detection mode as a touch detection result corresponding to the detection period.

5. The method according to claim 3 , wherein the method further comprises:
if the first result is that there is no touch point, and only one touch point is detected on the touch screen in the single-finger touch detection mode, re-detecting a touch point on the touch screen in the single-finger touch detection mode; and using a re-detected touch detection result as a touch detection result corresponding to the detection period.

6. The method according to claim 3 , wherein the method further comprises:
if multiple touch points are detected on the touch screen in the single-finger touch detection mode, detecting a touch point on the touch screen in the multi-finger touch detection mode; and using a touch detection result corresponding to the multi-finger touch detection mode as a touch detection result corresponding to the detection period.

7. The method according to claim 3 , wherein the method further comprises:
acquiring detection data in a first direction a single-finger touch detection mode;
determining whether there is a touch on a touch screen according to the detection data in the first direction;
acquiring detection data in a second direction if there is a touch;
determining whether there is only one touch point according to the detection data in the first direction and the detection data in the second direction;
determining coordinates of the touch point according to the detection data in the first direction and the detection data in the second direction if there is only one touch point;
activating a multi-finger touch detection mode if there are multiple touch points, and
determining coordinates of the touch points by detection data in the multi-finger touch detection mode.

8. The method according to claim 1 , wherein if the first result is that there are multiple touch points, the determining the touch detection mode according to the first result comprises:
determining the touch detection mode as a multi-finger touch detection mode.

9. The method according to claim 1 , if the first result is that there is no touch point, the touch detection mode includes a high speed mutual-capacitance detection mode.

10. The method according to claim 1 , wherein the detection period is configured by a user.

11. A touch controller, wherein a touch screen is configured with at least one first channel in a first direction and at least one second channel in a second direction, the first direction and the second direction being perpendicular, and an intersection of the at least one first channel and the at least one second channel being a capacitance node, wherein the touch controller comprises:
a determination unit, configured to determine a touch detection mode according to a first result at an initial time of a detection period, the first result being a touch detection result corresponding to an adjacent detection period prior to the detection period; and
a detection unit, configured to detect a touch point on a touch screen in the touch detection mode,
wherein the touch detection mode includes a single-finger touch detection mode and a multi-finger touch detection mode;
wherein the single-finger touch detection mode comprises a self-capacitance detection mode and a high speed mutual-capacitance detection mode, the multi-finger touch detection mode comprises a mutual-capacitance detection mode;
wherein the high speed mutual-capacitance detection mode refers to:
acquiring detection data of the at least one first channel in the first direction by transmitting a drive signal simultaneously along the at least one second channel; and acquiring detection data of the at least one second channel in the second direction by transmitting a drive signal simultaneously along the at least one first channel; and
wherein when there is no touch on a touch screen, a length of the detection period is increased to reduce the refresh rate of the touch detection; and when a touch occurs on the touch screen, the length of the detection period is reduced to improve the refresh rate of the touch detection.

12. The touch controller according to claim 11 , wherein the single-finger touch detection mode refers to: determining a touch point on the touch screen by detection data in one direction or by combining detection data in multiple directions; and the multi-finger touch detection mode refers to: determining a touch point on the touch screen by detection data on a plane, wherein the detection data in each of the multiple directions comprises at least one detection data for representing a touch condition in a single direction, and the detection data on the plane comprises at least one detection data

Assignees

• Shenzhen Goodix Tech Co Ltd

Inventors

• Fang Jun

Classifications

• G06F3/0446

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

• G06F2203/04104

  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 title

• G06F3/044 Primary

  by capacitive means · CPC title

• G06F3/041662 Primary

  using alternate mutual and self-capacitive scanning · CPC title