Method and device for improving accuracy of edge coordinates of projection-type capacitive touch panel

Abstract

A method for improving coordinate accuracy of a touch panel having sensing lines arranged to form an array includes the steps of: detecting existence of a touch point influencing at least one sensing line; determining existence of an edge sensing line; providing signal strengths to the at least one sensing line and a sensing line immediately adjacent to the at least one sensing line; generating a virtual sensing line extending out the touch panel and immediately adjacent to the at least one sensing line; providing a signal strength to the virtual sensing line; and obtaining actual coordinate of the touch point by weighing coordinates of the at least one sensing line, the sensing line immediately adjacent to the at least one sensing line and the virtual sensing line via system generated coordinates.

Description

technical field

[0001] The present application relates to coordinate calculation of a projected capacitive touch panel, and in particular to a method and device for improving the accuracy of edge coordinates of a projected capacitive touch panel. Background technique

[0002] At present, the calculation of the touch coordinates of the projected capacitive touch panel mostly adopts the weighted average method. Such a calculation method can meet the accuracy requirements in various applications. However, when the touch position is close to the edge of the touch panel, this calculation method will cause a large error in the calculated edge coordinates, so that when using or cause false touches on the application interface.

[0003] figure 1 An example of a method for calculating touch coordinates of a projected capacitive touch panel in the prior art is schematically shown. Taking a sensor array with 6 rows and 8 columns as an example, P11, P12, and P13 respectively represen...

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