Method and device for determining control parameters of counteracting branch circuit and touch control detection device

Abstract

An embodiment of the invention provides a method and device for determining control parameters of a counteracting branch circuit and a touch control detection device. The method includes inputting first constant signals to the counteracting branch circuit and inputting first excitation signals to a self-capacitance detecting branch circuit, wherein a rear end processing circuit of the self-capacitance detecting branch circuit at least performs differential treatment on output signals of the counteracting branch circuit and output signals of the self-capacitance detecting branch circuit determining phase delay sum generated when the self-capacitance detecting branch circuit and the rear end processing circuit of the self-capacitance detecting branch circuit respond to the first excitation signals according to the first output signals; inputting second constant signals to the self-capacitance detecting branch circuit and inputting second excitation signals to the counteracting branch circuit, wherein the rear end processing circuit of the self-capacitance detecting branch circuit at least perform differential treatment on output signals of the counteracting circuit and output signalsof the self-capacitance detecting branch circuit so as to obtain second output signals; determining phase delay generated by the rear end processing circuit in response to the second excitation signals according to the second output signals; determining control parameters of the counteracting branch circuit according to the phase delay sum and the phase delay generated by the rear end processingcircuit in response to the second excitation signals so as to at least counteract or reduce an original reference value of to-be-detected self capacitance.

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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