Capacitive touch screen signal sampling system and method based on FPGA

Abstract

The embodiment of the invention provides a capacitive touch screen signal sampling system and method based on an FPGA, and belongs to the technical field of touch screens. The system comprises: a screen receiving signal connector used for acquiring a screen receiving signal; the chip selection signal module that is used for sequentially carrying out multi-path screen receiving signal parallel gating according to the gating instruction issued by the FPGA control module; the charge transfer method measuring circuit that is used for receiving the multi-path screen receiving signals in parallel, converting the multi-path screen receiving signals into multi-path analog signals and sending the multi-path analog signals to the ADC sampling module in parallel; the ADC sampling module that is used for receiving the multiple paths of analog signals in parallel, converting each path of analog signal into a differential digital signal and sending the differential digital signal to the FPGA control module; and the FPGA control module that is used for decoding each path of differential digital signal and processing data obtained by decoding. The system provided by the scheme of the invention is simple and reliable in structure and can be flexibly applied to capacitive touch screens of various sizes, and the response rate of the capacitive touch screen is greatly improved.

Description

technical field [0001] The invention relates to the technical field of touch screens, in particular to an FPGA-based capacitive touch screen signal sampling system and an FPGA-based capacitive touch screen signal sampling method. Background technique [0002] With the development and wide application of smart device technology, more and more smart device control methods use touch screen control methods. The capacitive touch screen technology that uses the current induction of the human body to work is one of the most widely used technologies. For capacitive touch screens of different sizes and resolutions, the number of sensing and receiving channels of the screen sensor is different. How to quickly receive and process the analog signals from these channels is very critical. To reduce the response time of the touch and improve the touch performance of the touch screen, has significant meaning. In the traditional capacitive touch screen, all the channel signals are received ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the embodiment of the present invention is to provide an FPGA-based capacitive touch screen signal sampling system and method, to at least solve the problem that the current capacitive touch screen technology cannot adapt to the enlargement and control complexity of the capacitive touch screen

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