Self-capacitance compensation circuit and touch signal identification method of touch chip

By adopting a combination of a driving voltage generation circuit, a voltage driver and a parallel current discharge branch in the self-capacitor compensation circuit, the problems of slow speed and large area of ​​the traditional self-capacitor compensation scheme are solved, faster compensation time and smaller chip area are achieved, and the scanning speed of the touch screen is improved and the cost is reduced.

CN119668429APending Publication Date: 2025-03-21SHENZHEN AIXIESHENG TECH CO LTD
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Patent Information

Application Number
CN202411674991.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-21
Publication Date
2025-03-21

AI Technical Summary

Technical Problem

The traditional self-capacitor compensation scheme has the problem of slow compensation speed and large chip area, which leads to limited scanning speed and high cost of touch screens.

Method used

The self-capacitor compensation circuit including a driving voltage generation circuit, a voltage driver and a plurality of parallel current discharge branches are adopted to generate the driving voltage through a current rudder charge pump or a digital analog converter, and the load capacity is enhanced through the voltage driver, and the current discharge branch is driven to accurately compensate the electrode self-capacitance of the touch chip.

Benefits of technology

A significant reduction in compensation time and chip area are achieved, which improves the scanning speed of the touch screen and reduces costs.

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Abstract

A self-capacitance compensation circuit disclosed by the present invention comprises a driving voltage generation circuit, a voltage driver and a compensation branch, the compensation branch comprises a plurality of current discharge branches connected in parallel, and the voltage driver is connected between the driving voltage generation circuit and the compensation branch. Each current discharge branch is connected with an upper pole plate of a TX electrode of one channel of the touch chip through a first driving switch, and at least one current discharge branch is also connected with a TX electrode of the other channel of the touch chip or an upper pole plate of an RX electrode of the other channel or an upper pole plate of the RX electrode of the same channel through a second driving switch; and the driving voltage generation circuit is used for outputting driving voltage and driving the plurality of current discharge branches to discharge the self-capacitance of each electrode of the touch chip. According to the invention, voltage compensation is carried out on TX and RX electrodes in a plurality of touch channels by combining a voltage generation driver and a plurality of current discharge branches which are connected in parallel, and the compensation time can be greatly shortened by the circuit structure layout.
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