Method and device for determining control parameters of offset branch, and touch detection device

Abstract

A method and device for determining control parameters of an offsetting branch, and a touch detection device. The method includes: inputting the first constant signal to the canceling branch and inputting the first excitation signal to the self-capacitance detection branch, and the back-end processing circuit of the self-capacitance detection branch to the output signal of the cancellation branch and the output of the self-capacitance detection branch The signal is at least differentially processed to obtain the first output signal; according to the first output signal, the self-capacitance detection branch and the sum of the phase delays generated when the back-end processing circuit responds to the first excitation signal are determined; the self-capacitance detection branch is input to the second constant signal, and input the second excitation signal to the cancellation branch, and the back-end processing circuit performs at least differential processing on the output signal of the cancellation branch and the output signal of the self-capacitance detection branch to obtain the second output signal; after determining according to the second output signal The phase delay generated when the terminal processing circuit responds to the second excitation signal; according to the sum of the phase delays and the phase delay, the control parameters of the canceling branch are determined.

Description

technical field [0001] The embodiments of the present application relate to the field of circuit technology, and in particular to a method for determining a control parameter of an offset branch, a device thereof, and a touch detection device. Background technique [0002] If touch control is applied to electronic products such as smart terminals, users can realize terminal operations only through gesture operations, getting rid of traditional mechanical keyboards and making human-computer interaction more straightforward. [0003] Since the touch control can be realized directly based on the influence of the human body on the electric field, capacitive touch technology has become one of the main means for realizing touch control on electronic products at present. In capacitive touch technology, part is based on mutual capacitive touch, and part is based on self-capacitive touch. Since the self-capacitance touch can improve waterproof, anti-interference, and reduce power co...

AI Technical Summary

Problems solved by technology

[0004] In self-capacitance detection, since the self-capacitance to be detected is formed between the detection channel and the system ground, there is often a relatively large original reference value. When a touch occurs, the capacitance value of the self-capacitance to be detected changes less Small or also known as a small change rate, which may further lead to lower accuracy of touch detection and poor user experience

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