4-Wire Resistive Touch Screen
How it works
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 a conductive 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.
Electronics Characteristic
This specification suit analog resistance touch panel. Which used in LCD module
Apply To Specification
- Surface Hardness：3H
- Optical Clarity：80 %↑
- Operating Temperature ：-10°C ~ 60°C
- Endurance Test strikes ：Over 1 million
- Operating Voltage： DC5V
- Resistance：200W ~ 900W
- Linearity< 1.5%
- Faceplate Surface ：Anti-glare coating
- Operation Pressure ： 15 ~ 70g
- Storage Temperature：-20°C ~ 70°C
- Message Noise：5 m sec ~ 15 m sec
- Operating Current：5mA ~ 25mA
- Isolation Resistance：20MW↑ ＠DC25V
Dimension Size
| NO. | Contents |
| A,D | TOUCH PANEL OUTSIDE |
| B,E | VIEW AREA |
| C,F | ACTIVE AREA |
Optical Performance
Light transparency should keep above 80%↑ under the visible wave when the wave length is 550nm
Electrical Performance
- Connector Resistance
200Ω< X Axis <800Ω
300Ω< Y Axis <900Ω - Insulation Resistance
20MΩ↑ @ DC 25V - Electrostatic Endurance
No abnormal appearance after 10kv, 100W, 250PF electrostatic used. - Linearity
X Axis：1.5% ↓
Y Axis：1.5% ↓ - Operating Voltage
3V ~ 7V DC - Operating Current
5mA ~ 25mA
