Projection-type capacitive touch screen system time domain noise reduction method by space differentiation

Abstract

The invention discloses a projection-type capacitive touch screen system time domain noise reduction method by space differentiation. The method includes the steps that (1), a plurality of identical artificial circuit processing elements and relevant selection controllers are arranged inside a touch screen control chip; (2), a reference inducing line set of any target touch screen inducing line set to be processed in a touch screen inducing line array is selected according to space distribution; (3), identical imitation processors are used for driving and reading a target sensor and a reference sensor simultanously; (4), information of the target sensor and the reference sensor is judged; (5), the steps of (2), (3) and (4) are repeated until all target inducing lines of the touch screen are processed to finish one frame; (6) according to the distribution of status values of the inducing lines of the frame, finger touch points are calculated and judged, and time or space misinformation touch points are eliminated according to former frame information; and (7), according to the state of a current frame, the step (2) is returned or other operation is performed. According to the projection-type capacitive touch screen system time domain noise reduction method by the space differentiation, the system performance can be effectively improved, and the power consumption is reduced.

Description

technical field [0001] The invention belongs to the field of projected capacitive touch screens and touch screen control systems, and in particular relates to a time-domain noise reduction method utilizing spatial differences, which is used to accurately eliminate the influence of noise on touch systems and improve the anti-interference ability of capacitive screens. Background technique [0002] The projected capacitive touch screen system consists of a projected capacitive screen (hereinafter referred to as "capacitive screen") and a touch screen controller (hereinafter referred to as "touch circuit"). A capacitive screen consists of a substrate and a sensor array. Substrate materials include glass, PET, etc., including opaque substrates. The sensor array is an array formed by the regular arrangement of multiple sensing lines with specific shapes, and the sensing lines are made of indium tin alloy (ITO) or carbon or other conductive materials. In terms of electrical conn...

AI Technical Summary

Problems solved by technology

The second type of noise interference is caused by human fingers approaching or touching the capacitive touch screen sensor

Although this technology uses the concept of adjacent differential, due to the limitation of the number of analog processors used and the limitation that adjacent sensing lines cannot effectively eliminate the noise introduced by fingers, the effect of noise elimination needs to be further improved

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