Infrared touch screen works through light emitting diode transmitting infrared light and infrared receiver diode receiving infrared light
so the sunlight will have interference to it. Scanning period of anti-light infrared touch screens which use serial scanning mode is too long. Eight kinds of crystal 30.072 kHz
36 kHz
38 kHz
38.4 kHz
40 kHz
48 kHz
50 kHz
51.2 kHz are used to design signal sources of infrared emission diodes. Then
the same frequency crystals are used to design frequency selective circuits. The design make eight scanning units working simultaneously come true. It enhances the anti-light ability of IR touch screen and solves the problem of interference among the eight infrared transmitting diode in parallel scanning mode
reducing scan cycle.
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references
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