Hantouch is a Korean touch screen manufacturer producing high quality industrial touch screens. Hantouch has a wide selection of standard resistive touch screen products in both 4 and 5 wire technologies, between 5.7″ and 24″
4 Wire Resistive Overlays
5 wire Resistive Overlays
Capacitive Overlays
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4Wire Resistive Type
It is the most common type of touch screen technology, recognized the location by sensing the voltage change when the surface of the two transparent electrodes are pressed and two layers met.
Strength
- Low cost of mass production
- Easy structure, Simple detector circuit, High recognition
Challenge
- Low cost of mass production
- Easy structure, Simple detector circuit, High recognition
Operation principle
Apply the constant voltage on the top and bottom touch screen in sequence,(X-axis, Y-axis respectively), sense the touch screen after reading the electric potential of the opposite electrode.
Structure of the 4wire Resistive touch screen
- Top and bottom transparent conductive films are attached by double sided adhesive, Dot Spacers are placed with certain distance to prevent unnecessary short due to drooping of the top conductive film.
- Analog signal generated on the panel with touching is transmitted to controller through the FPCB.
Driving principle of the 4 wire resistive touch screen
Production method of the 4 wire resistive touch screen
| 1. Apply power between Vcc and GND on the top and bottom respectively (Touch: top and bottom short) |
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Touch Sensor/Controller
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| 2. X-axis voltage value Sensing and Digital change ( X,Y operation signal Switching) |
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| 3. Y-axis voltage value sensing and Digital change | ||
| 4. Data transmission |  |
Controller
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| 5. Displaying coordinate and Running event | |
Driver
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- Standby condition : Vcc and GND is applied on the top and bottom respectively to wait for touching.
X,Y driving signal switching and Coordinate detecting
- Equipotentiality : Constant and Continuos voltage change with being applied voltage on each X,Y-axis.
