Infrared add-on module can upgrade displays to touch-screen
It also can also be used to upgrade a normal TV to an interactive TV. The infrared touch screens use infrared LEDs arranged in arrays on two adjacent bezel edges of the PCB with photo sensors placed on the two opposite edges functioning as transmitters and receivers. The LEDs emit infrared rays simultaneously to form a grid of rays across the display. When the user wishes to send a signal through touch, he/she can do so by interrupting the light beams with a physical object. Since every infrared LED is independent, the touch screen is able to achieve positioning by measuring the decrease in light at the corresponding photo sensors. The signal is then processed by the control circuitry and sent to the PC for the coordinates of the touch event to be displayed on screen or to be used by other software for relevant signal operation.
Since infrared touch screens operate by detecting interrupted infrared light beams, a touch event can be registered without requiring contact at the overlay. Its strengths include high sensitivity, wear resistance (with glass overlay that reaches 7H in scratch hardness), a long lifecycle of over 300 million repetitive touches at a single point, over 95% transmittance. The LEDs have a basic lifecycle of 50,000 hours.
The number of LEDs can be adjusted to increase response speed or increase density for applications involving drawing, writing or as a sensor for gaming applications.
Visit Groovy Technology at www.gtouch.com.tw
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