Capacitance detection circuit, touch device and terminal equipment
A capacitance detection and touch device technology, applied in the field of detection, can solve the problem that capacitance cannot be detected by capacitance
Active Publication Date: 2021-09-10
SHENZHEN GOODIX TECH CO LTD
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Problems solved by technology
[0005] In view of this, one of the technical problems solved by the embodiments of the present application is to provide a capacitance detection circuit, a touch device and a terminal device to overcome the problem in the prior art that capacitance detection cannot be performed when the self-capacitance is large
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[0028] In order to make the purpose, features, and advantages of the embodiments of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, The described embodiments are only some of the embodiments of the present application, but not all of them. Based on the embodiments of the present application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the embodiments of the present application.
[0029] The specific implementation of the embodiment of the present application will be further described below in conjunction with the accompanying drawings of the embodiment of the present application.
[0030] like figure 1 As shown, the capacitance detection circuit includes a charging circui...
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Embodiments of the present application provide a capacitance detection circuit, a touch device, and a terminal device. The capacitance detection circuit includes: a charging circuit, which is used to charge the capacitor to be tested, so that the voltage difference between the two ends of the capacitor to be tested is a first preset voltage value; a discharge circuit, which is used to make the charged capacitor The capacitor to be tested releases a first amount of charge, wherein the first amount of charge is smaller than the amount of charge corresponding to the first preset voltage value; a signal detection circuit is used to detect the charge of the discharge circuit after being discharged. and a voltage difference between the voltage value on the capacitor to be tested and a second preset voltage value, so as to determine the capacitance variation of the capacitor to be tested according to the voltage difference. The capacitance detection circuit can perform capacitance detection when the self-capacitance is large.
Description
technical field [0001] The embodiments of the present application relate to the technical field of detection, and in particular to a capacitance detection circuit, a touch control device, and a terminal device. Background technique [0002] In recent years, with the popularity of smart mobile terminals, the performance requirements for capacitive touch screens are getting higher and higher. Correspondingly, the detection requirements for capacitive touch screens, especially the self-capacitance detection requirements for capacitive touch screens are also increasing. high. [0003] In the prior art, the architecture for self-capacitance has poor performance. With the development of capacitive touch screens, the self-capacitance of capacitive sensors (sensors) is getting larger and larger. From within 50pF at the beginning, it has gradually increased to 100pF, and now the mainstream 200pF and the self-capacitance of the latest capacitive sensors have reached as high as 500pF...
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IPC IPC(8): G01R27/26
CPCG01R27/2605G06F3/0416G06F3/044G06F3/0444
Inventor 蒋宏
Owner SHENZHEN GOODIX TECH CO LTD