Touch sensor, scanning method and electronic equipment

CN119536548APending Publication Date: 2025-02-28SHENZHEN CHIPSAILING TECH CO LTD
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Patent Information

Application Number
CN202411441044.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-10-15
Publication Date
2025-02-28

AI Technical Summary

Technical Problem

While reducing the number of pins, existing capacitive touch sensors have poor noise resistance and are difficult to effectively apply in low-cost electronic devices.

Method used

A touch sensor is designed, including an induction layer and a shielding layer. The induction layer is provided with an induction electrode close to the touch area. The shielding electrode is provided with a shielding electrode at intervals. The shielding electrode has a first state and a second state. In the first state, a shielding capacitor is formed with the induction layer and in the second state, and in a high-resistance state, for selectively de-shielding of part of the induction layer.

Benefits of technology

By reducing the number of pins of the control chip, the hardware cost is reduced. At the same time, by changing the state of the shielding electrode, the noise resistance of the sensor is improved and the accuracy of the touch signal is enhanced.

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    Figure CN119536548A_ABST
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Abstract

The invention provides a touch sensor, a scanning method and electronic equipment, an induction layer of the touch sensor is arranged close to a touch area, and an induction electrode is arranged in the induction layer; the shielding layers are arranged on the side, close to the touch area, of the induction layer at intervals, shielding electrodes are arranged in the shielding layers and have a first state and a second state, and in the first state, the shielding electrodes are connected to a fixed potential and used for shielding induction of the induction layer to touch signals; in the second state, the shielding electrode is in a high-resistance state, and the sensing layer is used for sensing a touch signal; the self-capacitance value is changed by sensing an external touch signal through the sensing layer, and each sensing electrode does not need to be connected with a pin of a control chip, so that the number of the pins of the control chip is reduced; the shielding effect on part of the induction layer is selectively relieved by changing the state of the shielding electrode, so that when the current induction electrode works, the nearby induction electrode is shielded, and the anti-noise capability of the sensor is improved.
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