Detection circuit for capacitance sensing line detection, capacitive touch screen and detection method

Abstract

Embodiments of the invention disclose a detection circuit for capacitance sensing line detection, a capacitive touch screen and a detection method. The detection circuit comprises a signal generation module, an RC oscillation module and a comparison and judgment module. The signal generation module is used for generating and outputting a driving alternating-current signal; the RC oscillation module is electrically connected with the signal generation module, and is electrically connected with a to-be-detected capacitance sensing line to form an RC bridge resonance circuit, the RC bridge resonance circuit generates a corresponding sensing alternating-current signal according to the driving alternating-current signal received by the RC oscillation module, and the sensing alternating-current signal is output through the capacitance sensing line; and the comparison and judgment module is electrically connected with the to-be-detected capacitance sensing line and the signal generation module, and is used for comparing the sensing alternating-current signal and the driving alternating-current signal and judging whether the comparison result is within a preset threshold range so as to get a line detection result according to the judgment result. There is no need to use a capacitor in line detection. The detection method can also be applied to the situation of low-frequency signal transmission, and lines are not scratched. The detection method meets the area and cost demands of ICs.

Description

technical field [0001] Embodiments of the present invention relate to touch screen detection technology, and in particular to a detection circuit for detecting a capacitive sensing line in a capacitive touch screen, a capacitive touch screen and a detection method. Background technique [0002] During the production and preparation process of the capacitive touch screen, the sensing circuit often has scratches, short circuits, resistance, etc., resulting in malfunction of the capacitive touch screen, wherein the sensing circuit includes the sensing electrode and its wiring. In order to ensure the quality of the capacitive touch screen, the manufacturer will test the sensing circuit of the capacitive touch screen before leaving the factory. There are mainly three types of existing detection technologies for detecting sensing lines of a capacitive touch screen. [0003] The first detection technique is to directly obtain the capacitance value of each sensing line and judge wh...

AI Technical Summary

Problems solved by technology

[0006] Embodiments of the present invention provide a detection circuit, a capacitive touch screen, and a detection method for detecting a capacitance sensing line in a capacitive touch screen, so as to solve the problem of poor detection effect, increased defect rate of the touch screen, and unsuitability for low-frequency transmission in the prior art. Signal and other issues

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