Dr Pan: Welcome to DISPLAY Museum. I am Dr Pan, the curator of Museum.
Greg: Hello, Dr Pan. I am Greg. I came here to learn about analog 4-wire resistive touch screen.
Dr Pan: Hello, Greg. Analog 4-wire resistive touch screen is the most common and basic touching technology.
Dr Pan: The most vivid feature is 4-wire FPC.
Dr Pan: It is going to need two layers to achieve the touch function: Top sheet ITO film and Bottom sheet ITO glass. It is supposed that bottom layer is X electrode and top layer is Y electrode, anode end is 5.0 V and cathode end is 0 V.
Dr Pan: When we touch the surface of the screen, it gets X1 in the X electrode and Y1 in the Y electrode according to the variation of voltages.
Dr Pan: The contacting position can be calculated since the values in both X and Y electrodes are noted.
Greg: Dr Pan, I heard analog 4-wire resistive touch screen isn’t serving as long as capacitive touch screen. Why?
Dr Pan: When we press the surface of resistive touch screen, ITO film will be deformed by the pressure.
Dr Pan: As the time goes by, eventually, ITO film will be damaged by the deformation, and both X and Y electrodes can’t detect the corresponding voltages, therefore it can’t be used any more.
Dr Pan: But every coin has two sides. Analog 4-wire resistive touch screen is very cheap and high resolution.
Dr Pan: It can be used in the hostile environment: dust, humidity, greasy dirt, etc.
Greg: Thank you, Dr Pan. Now I got it.
Dr Pan: Welcome to contact us if you have any question.