Touching apparatus and touching detecting method thereof

Patent metadata

Field	Value
Publication number	US-9389738-B2
Application number	US-201314056975-A
Country	US
Kind code	B2
Filing date	Oct 18, 2013
Priority date	Mar 15, 2013
Publication date	Jul 12, 2016
Grant date	Jul 12, 2016

Abstract

A touching apparatus and a touching detecting method thereof are provided. The touching detecting method is adapted for a touch panel. The touch panel has a plurality of touching rows and a plurality of touching columns. The touching detecting method includes: performing a mutual-capacitor touching detection and a self-capacitor touching detection alternatingly to the touch panel for obtaining a mutual-capacitor detection result and a self-capacitor detection result, respectively; and obtaining position information of at least one touch point on the touch panel by an operation based on the mutual-capacitor detection result and the self-capacitor detection result.

First claim

What is claimed is:

1. A touching detecting method for a touch panel having a plurality of touching rows and a plurality of touching columns, the method comprises:
performing a mutual-capacitor touching detection and a self-capacitor touching detection alternatingly to the touch panel for obtaining a mutual-capacitor detection result and a self-capacitor detection result, respectively;
obtaining position information of at least one touch point on the touch panel by performing an operation based on the mutual-capacitor detection result and the self-capacitor detection result;
determining whether none of absolute values of the plurality of mutual-capacitor capacitance variations included in the mutual-capacitor detection result falls within an invalid detecting range after the step of performing the mutual-capacitor touching detection is completed;
performing the mutual-capacitor touching detection continuously merely when none of the absolute values of the plurality of mutual-capacitor capacitance variations falls within the invalid detecting range; and
performing the self-capacitor touching detection merely when at least one of the absolute values of the plurality of mutual-capacitor capacitance variations falls within the invalid detecting range.

2. The touching detecting method of claim 1 , wherein the step of performing the mutual-capacitor touching detection comprises:
setting the plurality of touching rows or the plurality of touching columns as a plurality of driving channels, and setting the plurality of touching rows or the plurality of touching columns not set as the plurality of driving channels as a plurality of detecting channels;
providing a driving signal sequentially and respectively to the plurality of driving channels, and obtaining a plurality of mutual-capacitor capacitance variations sequentially and respectively through the plurality of detecting channels; and
generating the mutual-capacitor detection result based on the plurality of mutual-capacitor capacitance variations.

3. The touching detecting method of claim 1 , wherein the step of performing the self-capacitor touching detection comprises:
measuring capacitance variations for the plurality of touching rows and the plurality of touching columns sequentially to obtain a plurality of self-capacitor capacitance variations; and
generating the self-capacitor detection result based on the plurality of self-capacitor capacitance variations.

4. A touch apparatus, comprising:
a touch panel having a plurality of touching rows and a plurality of columns; and
a controller coupled to the touch panel, the controller performing a mutual-capacitor touching detection and a self-capacitor touching detection alternatingly to the touch panel for obtaining a mutual-capacitor detection result and a self-capacitor detection result, respectively; the controller obtaining position information of at least one touch point on the touch panel by performing an operation based on the mutual-capacitor detection result and the self-capacitor detection result; the controller determining whether none of absolute values of the plurality of mutual-capacitor capacitance variations included in the mutual-capacitor detection result falls within an invalid detecting range after the mutual-capacitor touching detection is performed and completed; the controller performing the mutual-capacitor touching detection continuously merely when none of the absolute values of the plurality of mutual-capacitor capacitance variations falls within the invalid detecting range; and the controller performing the self-capacitor touching detection merely when at least one of the absolute values of the plurality of mutual-capacitor capacitance variations falls within the invalid detecting range.

5. The touch apparatus of claim 4 , wherein when the mutual-capacitor touching detection is performed, the controller sets the plurality of touching rows or the plurality of touching columns as a plurality of driving channels, and sets the plurality of touching rows or the plurality of touching columns not set as the plurality of driving channels as a plurality of detecting channels; and the controller provides a driving signal sequentially and respectively to the plurality of driving channels, and obtains a plurality of mutual-capacitor capacitance variations sequentially and respectively through the plurality of detecting channels; and the controller generates the mutual-capacitor detection result based on the plurality of mutual-capacitor capacitance variations.

6. The touch apparatus of claim 4 , wherein when the self-capacitor touching detection is performed, the controller measures capacitance variations for the plurality of touching rows and the plurality of touching columns sequentially, so as to obtain a plurality of self-capacitor capacitance variations; and the controller generates the self-capacitor detection result based on the plurality of self-capacitor capacitance variations.

7. A touching detecting method for a touch panel having a plurality of touching rows and a plurality of touching columns, the method comprises:
performing a mutual-capacitor touching detection and a self-capacitor touching detection alternatively to the touch panel for obtaining a mutual-capacitor detection result and a self-capacitor detection result, respectively;
obtaining position information of at least one touch point on the touch panel by performing an operation based on the mutual-capacitor detection result and the self-capacitor detection result;
determining whether none of absolute values of the plurality of mutual-capacitor capacitance variations included in the mutual-capacitor detection result falls within an invalid detecting range and detecting whether an amount of the least one touch point on the touch panel is 1 after the step of performing the mutual-capacitor touching detection is completed;
performing the mutual-capacitor touching detection continuously merely when none of the absolute values of the plurality of mutual-capacitor capacitance variations falls within the invalid detecting range and the amount of the least one touch point on the touch panel is not 1; and
performing the self-capacitor touching detection merely when at least one of the absolute values of the plurality of mutual-capacitor capacitance variations falls within the invalid detecting range and/or the amount of the at least one touch point is 1.

8. The touching detecting method of claim 7 , further comprising:
detecting whether the amount of the at least one touch point is 1 after the step of performing the self-capacitor touching detection is completed;
performing the self-capacitor touching detection continuously merely when the amount of the at least one touch point is 1; and
performing the mutual-capacitor touching detection merely when the amount of the at least one touch point is not 1.

9. A touch apparatus, comprising:
a touch panel having a plurality of touching rows and a plurality of columns; and
a controller coupled to the touch panel, the controller performing a mutual-capacitor touching detection and a self-capacitor touching detection alternatingly to the touch panel for obtaining a mutual-capacitor detection result and a self-capacitor detection result, respectively; the controller obtaining position information of at least one touch point on the touch panel by performing an operation based on the mutual-capacitor detection result and the self-capacitor detection result; the controller determining whether none of absolute values of the plurality of mutual-capacitor capacitance variations included in the mutual-capacitor detection result falls within an invalid detecting range, and detecting whether an amount of the least one

Assignees

• Novatek Microelectronics Corp

Inventors

• Chang Chih-Yuan
• Hsia Chih-Peng
• Chang Hui-Hung

Classifications

• G06F3/0418 Primary

  for error correction or compensation, e.g. based on parallax, calibration or alignment · CPC title

• G06F3/044 Primary

  by capacitive means · 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

• G06F3/041662

  using alternate mutual and self-capacitive scanning · CPC title