The design principle of the four-wire resistive touch screen is to build two transparent coatings in the x-axis and y-axis directions, with the x-plane resistance formed by the x+ and x- ends on the x-axis, and the y+, y-, and the y-plane resistance formed at the end is combined into a switch with more functions using a thin-film key switch. When a certain point of the transparent touch panel is pressed, the contact points of the two-layer resistance at this time are transferred to the electrodes at the four ends. The formed resistance is changed to determine the position, and the electronic controller detects the relative position of the force point or a preset electronic function that should be made. This transparency can be widely used in various control panels to save space occupied by the control keyboard and increase a product’s convenience.
The eight-wire product is actually an extension of the four-wire product. To prevent errors in the voltage reading due to environmental influences or other peripheral equipment, an additional sense is added to the four leads of the upper and lower conductive layers for a total of eight survey lines. As a result, more realistic voltage values can be read to improve the accuracy of the operation.
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The design principle of the five-wire resistive touch screen uses a special form of surface resistance to enable distribution on the bottom conductive glass while using the upper coating to make contact. When the transparent touch screen is under pressure, the message is transmitted to the electronic controller through the four corners of the bottom layer. The change in resistance formed by the four electrodes is used to detect the relative position of the force point or make various preset electronic functions. In addition to the characteristics of this product and that the upper layer determines the contact effect, the bottom layer can also determine the contact effect, thus maintaining the established function even if the upper layer is abnormally damaged, which can greatly extend the product’s life.
The design principle of the matrix resistive touch screen is similar to the form of a thin-film key switch, except that the printed conductive circuit is replaced by a transparent coating. Furthermore, the use of transparency allows the product to have more diverse designs and applications. When a certain point of the transparent touch screen is pressed, the electronic controller can accurately detect and determine a variety of preset electronic functions due to the difference between the upper and lower connection lines. In addition to this product’s transparency, the principle of a matrix in different areas can be adopted, and a variety of key patterns can be designed according to consumer needs. It also allows the product to put multi-function design concept applications on the same touch switch.
