For information about other touch technology, see the following knowledge base articles: Understanding DIR Distributed Infrared technology Understanding HyPr Touch technology NOTE : Damage to a whiteboard's retro-reflective bezel can prevent the touch detection system from working properly.
See How to inspect the retro-reflective bezel on a DViT-based interactive whiteboard for damage for more information. The DViT cameras detect interactions with the surface. Although the light from the LEDs is not visible to the eye, most cameras can pick up a faint purple glow when the LEDs are on.
Some DViT camera modules are field replaceable. Refer to the installation and maintenance guides for more information. The Touch Master is not field accessible on interactive displays or flat panels. The DViT cameras are connected to the Touch Master in parallel, allowing the remaining cameras to continue to communicate if one camera fails.
Calibration is not possible in this situation. There is additional information on diagnostics at the end of this document. This special tape provides a consistent level of light across the surface of the interactive product.
On some products, the tape is white or silver; other products use black tape. Operation When an object, such as a finger or pen, touches the surface of the board, the object interrupts the plane of IR light that shines across the surface and scatters the light.
This scattered light is seen as a bright spot by the cameras and interpreted as a touch event. Differences in the intensity of light changes allow the SMART interactive product to tell the difference between a pen, a finger, an eraser, the palm of your hand, and so on.
Special material used in the manufacturing of the pens make them more reflective than a finger. This allows you to write with a pen and then quickly switch to using your finger for mouse-like control. Pen ID features pens that not only reflect IR light in a particular way, but absorb it as well. By making pens that reflect and absorb IR light differently, cameras that detect different types of IR can distinguish between the pens.
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