Patent ID: 8810531
Filing Date: 2014-08-19
Classification: G06F

Abstract:
1. A method of determining multi-touch in a touch panel, the method comprising: utilizing a plurality of sense channels to detect touch points on the touch panel for generating corresponding sense values; determining number of touch points on the touch panel; finding a first local maximum and a second local maximum from the sense values of the plurality of sense channels; comparing the first local maximum and the second local maximum with a first reference and a second reference for confirming the number of touch points on the touch panel; confirming the touch panel has two touch points when the first local maximum and the second local maximum are greater than the first reference; maintaining the determined number of touch points when the first local maximum is greater than the first reference, and the second local maximum is between the first reference and the second reference; confirming the touch panel has one touch point when the first local maximum is greater than the first reference, and the second local maximum is less than the second reference; maintaining the determined number of touch points when the first local maximum is between the first reference and the second reference, and the second local maximum is greater than the first reference; maintaining the determined number of touch points when the first local maximum and the second local maximum are between the first reference and the second reference; confirming the touch panel has one touch point when the first local maximum is between the first reference and the second reference, and the second local maximum is less than the second reference; confirming the touch panel only has one touch point when the first local maximum is less than the second reference, and the second local maximum is greater than the first reference; confirming the touch panel has one touch point when the first local maximum is less than the second reference, and the second local maximum is between the first reference and the second reference; and confirming the touch panel has one touch point when the first local maximum and the second local maximum are less than the second reference; wherein the first reference is greater than the second reference.