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Infrared (Grid) (IR)

Sensor Materials

Glass or acrylic substrate, wrap-around-bezel frame, LED matrix

 

Principle of Operation

  • LEDs create a grid of X and Y infrared light beams projected above the display and are detected by photoreceptors on the opposite edge.
  • Touch occurs when a finger or stylus blocks the beam from reaching light detectors.
  • Controller’s constant X and Y axis scanning detects blocked light detectors and triangulates touch location.

Pros and Cons

Pros Cons
Functions with scratches and surface wear Solid contaminants, moving liquids or obstructions may cause a false touch and may create dead zones until completely removed
Touch activated by bare finger, gloved hand, or a wide stylus Does not scale easily (new layout required)
Transmission typically 90 % to 92 % Beam spacing limits accuracy and stylus width
  Touch occurs slightly above the actual surface resulting in possible touch parallax or an unintended touch response
  Requires a bezel design to house the LEDs and detectors
  Limited to 2 or 3 resolvable touches

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