Capacitance detection device, touch device and terminal equipment
A capacitance detection and capacitor technology, which is applied in electrical components, electrical digital data processing, amplifiers with semiconductor devices/discharge tubes, etc., can solve the problems of inability to achieve offset effects and reduce capacitance detection sensitivity
Active Publication Date: 2021-01-29
SHENZHEN GOODIX TECH CO LTD
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- Application Information
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Problems solved by technology
However, for the traditional Cancel circuit, there will be a transient overshoot at the moment of square wave coding, and the amplitude and slope of the overshoot voltage are related to the trace resistance and parasitic capacitance parameters of the detection electrode. Therefore, an effective offset effect cannot be achieved , which reduces the sensitivity of capacitance detection
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Embodiment Construction
[0042] The embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
[0043] figure 1 is a schematic structural diagram of a capacitance detection device 100 according to an embodiment of the present application, such as figure 1 As shown, the capacitance detection device 100 includes:
[0044] A charging module 110, configured to charge the basic capacitance 130 between the detection electrode and the system ground;
[0045] The integrating circuit 150 includes an amplifier 151 and an integrating capacitor 152, the integrating capacitor 152 is connected in parallel with the amplifier 151, and the integrating circuit 150 is used to integrate the charge transferred from the basic capacitor 130 through the integrating capacitor 152 ;
[0046] an offset capacitor 120, configured to offset the contribution of the base capacitor 130 to the output voltage of the amplifier 151;
[0047] The contro...
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The application discloses a capacitance detection device, a touch control device and a terminal device. The capacitance detection device includes: a charging module for charging the basic capacitance between the detection electrode and the system ground; an integration circuit including an amplifier and an integration capacitor, The integrating capacitor is connected in parallel with the amplifier, and the integrating circuit is used to integrate the charges transferred from the basic capacitor through the integrating capacitor; the canceling capacitor is used to cancel the output of the basic capacitor to the amplifier The contribution of the voltage; a control module, used to control the charging module to charge the basic capacitor in the first stage, control the charging module to disconnect and charge the basic capacitor in the second stage, and in the third stage Phase control transfers charge on the base capacitance to the integrating capacitor; wherein the charging voltage of the charging module, the capacitance of the integrating capacitor and the capacitance of the canceling capacitor make the base capacitance contribute to the amplifier's The contribution to the output voltage is zero.
Description
technical field [0001] The embodiments of the present application relate to the field of capacitance detection, and more specifically, to a capacitance detection device, a touch control device and a terminal device. Background technique [0002] Self-capacitance detection technology is widely used in the field of human-computer interaction of electronic products. Specifically, a capacitance (self-capacitance, or basic capacitance) will be formed between the detection electrode and the ground. When a conductor (such as a finger) approaches or touches the detection When the electrode is connected, the capacitance between the detection electrode and the ground will change, and the information of the conductor approaching or touching the detection electrode can be obtained by detecting the change in capacitance. [0003] In some scenarios, such as the touch screen of a smart phone, the sensitivity of capacitance detection is high. For example, the self-capacitance of the detecti...
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IPC IPC(8): G06F3/044
CPCG06F3/044G06F3/04166H03F3/45475H03F2203/45116H03F2203/45514G06F3/04182H03F2200/129G06F3/0416
Inventor 陈土江蒋宏
Owner SHENZHEN GOODIX TECH CO LTD