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What are the four wire, five wire and eight wire touch screens?

Author:admin Time:2017-07-28

In fact, these are resistive touch screens. And their differentiation can be seen through the touch screen. Now I will introduce their principles and differences.
One, four wire touch screen principle:
Four wire resistive touch screen is the most widely used and popular type of resistor family. The structure of the utility model is composed of a lower line conductive ITO layer and an upper line conductive ITO layer. The center of the upper and the lower circuits are in open circuit when the touch screen surface is free of pressure. Once the pressure is applied to the touch screen, the next line is conducted, the controller through the line of conductive ITO layer in the X direction of driving voltage applied, through the probe on line ITO conductive layer, the voltage detection in the X direction, the calculated coordinates of X contact. The direction of the applied voltage is changed by the controller, and the Y coordinate of the contact can be measured by the same direction so as to define the position of the contact.
Two, five wire resistance touch screen principle:
The structure of the five wire touch screen is similar to that of the four wire resistor. There is also a lower conductor (glass or film material) conductive ITO layer and upper line (film material) conductive ITO layer. The working principle of the five wire touch screen is different from that of the four wire resistor. The driving voltage of the five wire type X and the Y direction is generated by the ITO layer of the lower line, and the upper line layer acts only as a probe for detecting the voltage. Even if the circuit film layer is scratched or damaged, the touch screen can work properly, so the life of the five wire resistor is much longer than that of the four wire type.
Three, eight wire resistance touch screen principle:
The eight wire resistive touch screen is based on a four wire resistor type. It adds a reference lead to each of the four wire outlets, thus doubling the number of leads and reaching eight. Although the work of the eight wire resistor is similar to that of the four wire resistor, it has the advantage of being able to effectively avoid drift due to prolonged use or environmental factors. The additional four lead lines are auxiliary leads. Their function is to read the actual voltage generated by the driving voltage, so that the eight wire resistance controller can automatically correct the drift.

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