Touch control point detection method

Abstract

The invention provides a touch control point detection method for a capacitive touch panel, which comprises the steps of: scanning sensing capacitors of the capacitive touch panel in a horizontal direction and a vertical direction, so as to obtain first difference signals and second difference signals corresponding to the sensing capacitors, accumulating the first difference signals of the sensing capacitors in the same line for generating row load signals corresponding to each line of the sensing capacitors, accumulating the second difference signals of the sensing capacitors in the same row for generating row load signals corresponding to each row of the sensing capacitors, and comparing the line load signal and the row load signal corresponding to one sensing capacitor for selecting the first difference signal or the second difference signal corresponding to the sensing capacitor, and determining whether the sensing capacitor is a touch control point on the basis of the selected difference signal and a touch control threshold. The touch control point detection method can obtain more accurate touch control point detection results.

Description

technical field [0001] The invention relates to a touch detection technology, in particular to a touch point detection method for a capacitive touch panel. Background technique [0002] In various consumer electronic products, touch panels have been widely used as input devices. Users can directly give instructions and operate on the objects or menus displayed on the touch panel through actions such as touching, sliding, and writing on the touch panel with a finger or a stylus, so as to provide more convenient user experience. machine operation interface. Differentiated by different sensing technologies, touch panels can be classified into capacitive, resistive, optical, and so on. Please refer to figure 1 , figure 1 It is a schematic diagram illustrating a capacitive touch panel 100 in the prior art. The capacitive touch panel 100 includes a sensing capacitor C 11 ~C MN , electrode X 1 ~X M with Y 1 ~Y N , where the sensing capacitance C 11 ~C MN with electrode...

AI Technical Summary

Problems solved by technology

However, due to the sense capacitance C 34 through electrodeX 3 Sensing capacitance (C 32 、C 36 with C 38 ) interference, so the sensing capacitance C 34 produce an incorrect sense signal S SEN1_34 , resulting in a difference signal S DIFF1_34 (8) Less than the touch threshold TH TOUCH (10)

At this time, although the corresponding sensing capacitance C 34 The difference signal S DIFF2_34 (18) greater than the touch threshold TH TOUCH (10), however, the touch point detection method in the prior art is based on the difference signal S DIFF1_34 (8), judge the sensing capacitance C 34 not a touch point

In other words, in the capacitive touch panel, when the user performs multi-touch, the touch point detection method in the prior art may not be able to detect the touch point correctly.

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