Pressure-sensitive detection circuit, pressure-sensitive detection circuit array, touch panel and detection method

A detection circuit and circuit technology, applied in the direction of measuring resistance/reactance/impedance, measuring electrical variables, measuring force, etc., can solve problems such as affecting accuracy, and achieve the effect of improving detection accuracy and solving the decrease of detection accuracy.

Active Publication Date: 2021-10-08
BOE TECH GRP CO LTD
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  • Description
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Problems solved by technology

Therefore, the leakage current of the ungated pressure-sensitive detection circuit affects the detection accuracy of the gated pressure-sensitive detection circuit

Method used

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  • Pressure-sensitive detection circuit, pressure-sensitive detection circuit array, touch panel and detection method
  • Pressure-sensitive detection circuit, pressure-sensitive detection circuit array, touch panel and detection method
  • Pressure-sensitive detection circuit, pressure-sensitive detection circuit array, touch panel and detection method

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Embodiment Construction

[0035] Please refer to figure 1 , shows an exemplary circuit structure diagram of a conventional pressure sensing circuit. like figure 1 As shown, the traditional pressure sensing circuit includes a piezoresistive sensor 12, a gate transistor 11 and a resistive voltage amplifier 13, and the resistance value of the piezoresistive sensor 12 is R X , the resistance of the resistor 14 connected in parallel with the amplifier 13 is R F , then the output V OUT for voltage. Therefore, it is possible to utilize V OUT The change of the resistance of the piezoresistive sensor 12 can be known, and then it can be judged whether there is external pressure. However, since the piezoresistive sensor is connected to the amplifier, the detection of the circuit is normally open, and the leakage current of the ungated pressure sensing circuit affects the detection accuracy of the gated pressure sensing circuit.

[0036] In view of the above shortcomings of the prior art, the present inven...

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Abstract

The present application discloses a pressure-sensitive detection circuit, a pressure-sensitive detection circuit array, a touch panel and a detection method. The pressure-sensing detection circuit includes a collection sub-circuit and a reading sub-circuit, the collection sub-circuit is used to receive an external pressure signal through a piezoresistive sensor according to the gating signal, and convert it into a corresponding voltage signal; the reading sub-circuit The circuit is used for receiving the voltage signal and outputting a detection output signal related to the voltage signal; the collecting sub-circuit and the reading sub-circuit are respectively powered by a constant current source. According to the technical solutions provided by the embodiments of the present application, by setting the constant current source on the acquisition sub-circuit and the reading sub-circuit respectively, the problem of the decrease of detection accuracy caused by the leakage current of the traditional detection circuit can be solved.

Description

technical field [0001] The present disclosure generally relates to the field of pressure sensing, and more particularly, to a pressure sensing circuit, a pressure sensing circuit array, a touch panel and a detection method. Background technique [0002] Pressure sensing technology is a technology for detecting external pressure. This technology is widely used in various fields, such as portable electronic devices such as mobile phones and tablets. [0003] A traditional piezoresistive detection circuit usually includes a piezoresistive sensor, a gate transistor, and a voltage amplifier, wherein the piezoresistive sensor, gate transistor, and voltage amplifier are connected in sequence, the voltage amplifier is connected in parallel with the feedback resistor, and the piezoresistive sensor is connected to a reference voltage, voltage The output terminal of the amplifier outputs a detection voltage signal. Since the piezoresistive sensor is connected to the amplifier, the det...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F3/041
CPCG06F3/0414G01L1/225G06F3/0416G06F3/04144G01R27/14G06F3/045G01L1/205
Inventor 郑智仁王海生郭玉珍丁小梁刘英明王鹏鹏曹学友
Owner BOE TECH GRP CO LTD
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