Anti-interference multipoint capacitance touch-control membrane system

Abstract

The invention discloses an anti-interference multipoint capacitance touch-control membrane system which comprises a multipoint capacitance touch-control membrane and a measuring circuit board, wherein the multipoint capacitance touch-control membrane is connected with the measuring circuit board through a flexible printed circuit board; the measuring circuit board is connected with a computer through a USB (Universal Serial Bus) line; two layers of PET membranes are arranged as the substrates of the multipoint capacitance touch-control membrane; a plurality of nanometer leads are uniformly distributed between the two layers of PET membranes along X and Y directions; the measuring circuit board is composed of a high-precision measuring module, a measuring module shielding shell, a high-speed USB module and a USB power filtering module. The anti-interference multipoint capacitance touch-control membrane system has the characteristics of multipoint touch control, strong anti-interference property, strong instantaneity, high communication rate, and the like.

Description

technical field [0001] The patent of the invention relates to an anti-interference multi-point capacitive touch film system, which belongs to the field of computer hardware and software, and specifically relates to a touch film and a measurement circuit board based on projected mutual capacitance technology. Background technique [0002] Compared with traditional touch screens, the existing projected capacitive touch film uses fine nanowires as capacitive sensors. Since the capacitance value is directly proportional to the area of ​​the capacitor pole plate, and the nanowire is a pole plate of the capacitor, the capacitance value is extremely weak, about 10pF. The finger of the human body is also a very weak capacitance (capacitance value is at the pF level). When the finger of the human body is close to the nanowire, the capacitance of the finger will be superimposed on the original capacitance of the nanowire. The nano-touch film system measures this capacitance value, an...

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Problems solved by technology

[0003] Because the measured capacitance value is very weak, a precise measurement circuit module is required, so it is easy to be interfered by external electromagnetic waves. In addition, the power supply system of the measurement circuit usually has high-frequency interference, which will also have great interference to it.

[0004] Due to the use of self-capacitance technology, it is impossible to achieve multi-point in the true sense. The so-called two-point in the market is also realized through the upper-level algorithm, and there are inevitably ghost points.

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