TOUCHSCREENS


Touch-screen includes 4-wire resistive, all cables, and serial or USB controller. All sizes and types are available, including resistive, capacitive, matrix, infra-red, etc.

Smaller size LCD panel kits in box type frame can allow the touch screen controller to be integrated and mounted inside the steel box frame.


CAPACITIVE TOUCHSCREEN


Unlike a resistive touchscreen, a capacitive touchscreen is not pressure-sensitive and uses no plastic overlay. Instead, a capacitive touchscreen consists of a glass substrate with a thin-film conductive coating fused right into the glass. On top of this is another anti-scratch glass overcoat. This seals in the sensor electronics and makes them impervious to scratches.

Circuits at the corners of a capacitive screen uniformly distribute a low-voltage AC field over the conductive surface. When a finger disrupts that field, the controller measures the change in current flowing from each corner and calculates the X and Y coordinates, which tell the computer the exact point of the screen where the user is touching.


INFRA-RED TOUCHSCREEN


DIVD typically uses these types of touchscreens for retrofits and/or for monitors with a viewing diagonal of greater than 30 inches.

infra-red Just as acoustic wave technologies transmit sound waves across a monitor screen, infrared systems transmit light beams across a screen. Using infrared light emitting diodes around the screen's frame or bezel, a matrix of infrared light beams is transmitted vertically and horizontally across the screen. When a stylus (>4mm) or a finger (gloved or ungloved) blocks the light, photo transistors detect the change and send a signal that indicates the X-Y coordinates.

Infrared's main advantage is that it can be used without an overlay, so there's nothing covering the monitor to degrade image quality. The original image quality is preserved because there is no film in front of the display. A resistive overlay can degrade an image by up to 25 percent, according to industry experts.

infra-red

Benefits

  • Non-invasive scanning infrared touch systems can be easily attached to a Monitor without disassembly
  • Adjusts to changing light conditions, including direct sunlight
  • Since the opto-electronics determining the touch location are fixed in one place, infrared touch systems are not subject to sensor drift. They need only to be aligned with the corresponding display
  • Because no overlay covering the display is required, the transmission of infrared touch systems is 100%
  • Vandal- and abrasion-resistant screens, ideal for rugged applications
  • Infrared touch systems are solid state technology and have no moving mechanical parts. As such, they have no physical sensor that can be abraded or worn out with heavy use over time