Resistive Touch Screens
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Resistive Touch Screens with 4 or 5 wire technology

A Resistive Touch Screen is the most easy and economical solution to make a display (LCD) a touch sensitive device.
Cheap, easy to install, a resistive touch can be sealed (on the border) to the enclosure in which it's assembled, so granting up to IP67 protection.
Many sizes are available, from the smallest ones (like 3") to 21 or 26". For larger sizes, typically other technologies are used like SAW, Zytronic, IR.

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A Resistive Touch Screen has a very simple operation: a glass (typically about 2 ~ 3mm thick) which front face is coupled to a flexible plastic membrane. The interior of the membrane is conductive, as well as the face of the glass. The membrane is separated by micro plastic shims, virtually invisible.
Your finger or stylus presses on the diaphragm and causes it to touch the glass. This creates a divider (resistive) both horizontally and vertically, and the measured voltage determines the position in both X and Y axes.
The attached figures illustrate the operation of the touch.

The resistive touch can be a 4-wire (4W) or 5 wires (5W) touch. Normally, the smaller sizes are 4W for compatibility with electronic interfaces typical of ARM processors. 4W means that the measurement point is detected by reading the voltage of the contact point with respect to the two parts which touch each other (relative measurement); 5W means that the measure for both X and Y is detected with respect to a zero point (ground), or the 5th wire.
5W technology is more reliable and accurate for larger size touch screens.

Highlights: "good" and "bad"

  • Ease of installation
  • Possibility of bonding (along the edge) to the container (panel)
  • Easy connection to a LCD
  • Acceptable transparency
  • Not recommended with transflective displays
  • The resistive membrane is unsuitable for use in outdoor or unsupervised applications
  • The front membrane can be damaged and cut with a sharp object
  • Can be operated with objects (such as stylus pens) because the operation is mechanical in nature (resistive touch) and not due to changes in electromagnetic and/or capacitive fields
  • The membrane is subject to alterations depending on the ambient temperature
  • Operating range temperature is not large
  • Easily attacked by chemicals (solvents, detergents): maintenance is then delicate
  • Cost efficient

Ultimately, a resistive touch screen is excellent in industrial applications where the operator is trained to use it properly without damaging it, but it is not recommended in applications like unattended kiosks, totems, oudoor systems generally or other places which can be subject to possible vandalism.

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Disponiamo di diverse marche sia di touch resistivi 4W che 5W. Secondo il tipo di display selezionato potremo suggerire la migliore soluzione per il touch-screen resistivo.

We can deliver many different brands both for 4W touch screen and for 5W touch screens. After you have chosen the LCD display, we'll advise you of the best solution with a resistive touch for your application.