Dongguan CJTouch Electronic Co., Ltd
Dongguan CJTouch Electronic Co., Ltd
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How does a resistive touch screen work?
In simple terms, a Resistive Touch Screen is a touch-sensitive computer display that responds by applying pressure.When contact is made to the surface of the touchscreen, these two sheets are pressed together. Each sheet has horizontal and vertical lines that register the precise location of the touch.
The sensing process is as below.
The sensing process Voltage is imposed between the electrode X1 and X2 on the top sheet. Then, there will be formed on the top sheet an equipotential distribution that is parallel to the X1 and X2.
Assuming that the electrode X1 is 0V (Ground), then impose 5V to the electrode X2. If the central point between the right and left electrodes is touched, 2.5V would be measured by the bottom sheet. If a point 1/5 away from X1 (4/5 away from X2) is touched, 1V would be measured by the bottom sheet. The X coordinate point is detected in this way.
After detecting the coordinate point in X direction, Voltage is imposed between the electrode Y1 and Y2 on the bottom sheet. The point between Y1 and Y2 (Y coordinate) would be measured by the top sheet, just in the same manner as X coordinate in the step 1-2.
As the set of step 1, 3 is repeated, the X and Y coordinate points of touched locations keeps being detected.
Is there structural difference between 4-wire and 5-wire technologies?
Just same as analog 4-wire resistive technology, an analog 5-wire resistive sensor consists of top and bottom sheets which are facing each other with a gap in between. Unlike analog 4-wire resistive technology, electrodes are placed on four corners of the bottom sheet in analog 5-wire technology. The sensing process is as below
Main Feature
Specification of Product
| 4 Wires Resistive Touch Panel Specification | |
| General Size | 5.7 inch To 22 inch |
| Fit in with | Panel display device |
| Mechanical | |
| Input Method | Finger or gloved hand (rubber ,cloth or leather) |
| Active Force | Stylus or Finger or Similar <45g~110g |
| Ball Impact | ø13.0. Steel Ball/9g, Height=30cm, 1 time, no damage [Impact at center area] |
| Durability | >35 million touches |
| Positional Accuracy | <1.5% |
| Optical | |
| Light Transmission | 82% |
| Clear surface | <3% |
| Anti-glare Surface | <4% |
| Anti-Newton | <10% |
| Gloss | 90±20 gloss units tested on a hard-coated front surface Accordance with ASTM D 2457 |
| Electrical | |
| Supply voltage | DC5V |
| Circuit Resistance | X:20~25Ω0, Y:20~250Ω |
| Linearity | X<1.5%, Y<1.5% |
| Response | <15ms |
| Insulation | >20MΩ/25V(DC) |
| Endurance | No acting damage at DC50V/60sec. |
| Resolution | Based on controller resolution of 4096 x 4096 |
| Environmental | |
| Operation Temperature | -10°C ~ +60°C |
| Operation Humidity | 20%RH ~ 85%RH, no condensing |
| Storage Temperature | -40°C ~ +80°C |
| Storage Humidity | 10%RH ~ 90%RH, no condensing |
| Waterproof | Not damaged by running water applied to the active area |
| Reliability | |
| Heat Cycle | 70°C /240 hrs |
| Cold Cycle | -40°C /240 hrs |
| Thermal Cycle | -40°C ~7°0C [60 min./cycle] *10 cycles |
| Operationg System | |
| Operation System | Linux/ Dos / Windows ME/95/98 / NT4.0/XP/2000/ 7 /Mac OS |
| Warranty | |
| Touch screen 1 years | |
| Touch Controller 1 years | |
Picture of Product
Technical Drawing