Analog 4-wire Resistive touch screen technology
Leave a message
Analog 4-wire resistive touch screen has the most basic sensing method of resistive technology.
Top and bottom transparent conductive sheets that have uniform resistance value, are facing each other with a gap. When the top sheet is touched, the touched point of the top sheet yields, and contact the bottom sheet. The contacted point is conducted, and its location is sensed.
As feature of analog 4wire resistive technology, one sheet has electrodes for the vertical direction while the other sheet has electrodes for the horizontal direction. Voltage of a touched point is measured by the other sheet. In this way, the touched point in X and Y directions is detected. The sensing process is as below.
4-Wire Resistive Technology Touch measurement in 4-wire resistive technology is made in two parts. Firstly, the distance along the X axis at the point of touch is measured by creating a horizontal voltage gradient on the top sheet, with the bottom layer acting as the return layer. Secondly, a vertical voltage gradient is created on the bottom layer for measuring the Y axis.
Advantages:
• 4-wire resistive touch screen is the cheapest technology as the technology and electronics are simple.
• 4-wire technology also enjoys the benefit of inherent low power consumption, and common availability of chipset controllers with support from imbedded operating systems.
Disadvantages:
• Both layers need Voltage gradient, so either of them damaged would stop functioning of the touch screen.
• Since both layers are made of plastic, damage can easily occur. This lack of durability means that 4-wire resistive touch screen cannot be used for applications like public access kiosks, industrial locations or on displays larger than 12’.
Resistive Technology : Analog 4-wire Resistive, Analog 5-Wire Resistive, Analog 7-wire Resistive, Analog 8-wire Resistive, Features of resistive technology
Capacitive Technology: Surface Capacitive touch technology, Projected Capacitive touch technology
