Edge coordinate algorithm and position sensing system of touch panel

Abstract

The invention discloses an edge coordinate algorithm and a position sensing system of a touch panel. The edge coordinate algorithm of the touch panel comprises the following steps of: firstly, providing dummy sense lines to surround the touch panel; determining x and y coordinate ranges of a plurality of x-direction and y-direction sense lines of the touch panel; when the touch panel is touched, finding out corresponding x-direction and y-direction sense lines, and finding out a dummy sensing capacitance value generated by the dummy sense lines; then, judging whether an x-direction sensing capacitance value corresponding to the x-direction sense line is not more than the x-direction dummy sensing capacitance value, if so, finding out an x coordinate according to the x-direction sensing capacitance value and the dummy sensing capacitance value; and then, judging whether a y-direction sensing capacitance value corresponding to the y-direction sense line is not more than a y-direction dummy sensing capacitance value, if so, finding out an interpolated y coordinate according to the y-direction sensing capacitance value and the dummy sensing capacitance value.

Description

technical field [0001] The present invention relates to a coordinate algorithm and a position sensing system of a touch panel, and in particular to a coordinate algorithm and a position sensing system for coordinate positioning of an edge area of ​​a touch panel. Background technique [0002] As the demand for multi-touch technology increases, the projected capacitive touch technology has become one of the mainstream touch panel technologies. Since the human body is an excellent conductor, if the human body is close to the projected capacitive touch panel, the capacitance generated by the capacitive coupling between the transparent electrode (ITO) of the projected capacitive touch panel and the human body will increase. By detecting the capacitance change of the sensing line on the projected capacitive touch panel, the position of the touched point can be known. [0003] Generally speaking, in order to sense sufficient body capacitance, the projected capacitive touch panel ...

AI Technical Summary

Problems solved by technology

[0004] However, the aforementioned coordinate value interpolation method can only be realized when the user's touch operation simultaneously triggers a capacitance change on two (or more than two) sensing lines.

In this way, when the user's touch operation is triggered on the edge area of ​​the capacitive touch panel, and only one sensing line has a capacitance change, the aforementioned method cannot be realized.

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