Method and device for reducing poor linearity in location detection

摘要

The changes of capacitances of a plurality of detecting locations on a touch screen are detected for determining a profile corresponding to each external object approaching or touching the touch screen. Then the location of each external object is generated separately by two or four values in the corresponding profile.

主权项

1. A method for location detection of a touch screen comprising:
detecting changes in capacitances of a plurality of detecting locations on the touch screen, wherein each change in capacitances corresponds to a coordinate; and determining a profile corresponding to each external object based on the changes in capacitances of the detecting locations on the touch screen, and generating a coordinate data of each external object based on two values in the corresponding profile, wherein the coordinate data is (C1×X1+C3×X3)/(C1+C3), wherein X1 and X3 are the coordinates for C1 and C3, respectively, and C1 and C3 correspond to two values in the profile of each external object, respectively, wherein C1 is the value immediately preceding a largest value C2 in the profile, C3 is the value immediately following the largest value C2 in the profile.