Method of determining touch detection mode and touch controller

Patent metadata

Field	Value
Publication number	US-11036334-B2
Application number	US-201816107139-A
Country	US
Kind code	B2
Filing date	Aug 21, 2018
Priority date	Jul 20, 2017
Publication date	Jun 15, 2021
Grant date	Jun 15, 2021

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 (S 110 ), 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 (S 120 ), 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;
detecting a touch point on the touch screen in the touch detection mode during the detection period, wherein the touch detection mode includes a single-finger touch detection mode or a multi-finger touch detection mode;
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; or
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;
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, the 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 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.

4. The method according to claim 1 , 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.

5. The method according to claim 1 , 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.

6. 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 processor, 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
the processor, configured to detect a touch point on the touch screen in the touch detection mode during the detection period,
wherein the touch detection mode includes a single-finger touch detection mode or a multi-finger touch detection mode;
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; or
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;
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, the 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.

7. The touch controller according to claim 6 , 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.

8. The touch controller according to claim 6 , wherein the processor is configured to:
use a touch detection result corresponding to the single-finger touch detection mode as a touch detection result corresponding to the detection period if only one touch point or no touch point is detected on the touch screen in the single-finger touch detection mode.

9. The touch controller according to claim 6 , wherein the processor is further configured to:
re-detect a touch point on the touch screen in the single-finger touch detection mode 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

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

• G06F3/041662 Primary

  using alternate mutual and self-capacitive scanning · CPC title

• G06F3/044 Primary

  by capacitive means · CPC title