Cellphone Touch Screen

4-Wire resistive touch screen is the preferred solution for low cost applications. It consists of a conductive bottom layer (ITO Glass or Film) and aconductive top layer (ITO Film) . The two layers are suspended by many very small spacer dots. When a certain point is touched, the top layer contacts the bottom layer and a voltage charged by the controller is applied to the bottom layer's electrodes. The coordinate X axis of the touch point can be detected by measuring the voltage value thru the top ITO layer and the coordinate Y axis of the touch point can be detected in the same way by changing voltage input to the top layer's electrodes.
Specification
Circuiting Rating: 5V DC, 35mA
Surface Hardness: 3H
Light Transmission: Film + Film > 75%
Hitting Life Expectancy: Over 1 million
Film + Glass > 80%
Scoring Life Expectancy: Over 100, 000
Contact Bounce: <5ms
Resolution: 4096x4096
Linearity: 1. 5% (<1. 0% By Request)
Choices of Glass Thickness: 0. 7mm, 1. 1mm, 2. 0mm, 3. 0mm
Operating Force: 10g~100g
Choices of Glass: Normal Glass, Chemically strengthened glass