Transform a Regular LCD Into a Touchscreen — OZONE Asylum, home of the Mad Scientists

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Transform a Regular LCD Into a Touchscreen

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Your Text: Insert Slimies » Insert UBB Code » Close Last Tag \| All Tags UBB Help	Hey Mas, I think I can give you good idea of how it works... I've used a white-board-and-projector type system before that makes use of both light and sound to track one of several pen sleeves (or a board wiper). The unit conected to a PC via USB 2.0, and allowed either the capture of real pen-work upon the board/screen, or the projection of virtual penwork using dummied sleeves. The principal of the system is fairly simple; pens (or dummies) are inserted into a sleeve which emits a specific frequency of infrared and ultrasonic pulses. A passive sensor at the corner of the screen determines the angular position of the pen by detecting the infrared pulse, while the pen's distance from the sensor is determined by the time-lag between the light and sound pulses. The coordinates (so long as they fall within the pre-specified screen area) are then translated to the appropriate coordinates within the virtual workspace. The system is able to determine which pen is being used, and it is extremely accurate over the expanse of a white board or projection screen. Of course, the system depends upon colour-specific battery-operated sleeves for each pen, but in principal, the same light-and-sound method [i]could[/i] be applied on a smaller scale - and with any object used as a stylus, if the light and sound are emitted from an 'active' sensor unit and the reflections used to determine the position of the 'passive' object held close to the screen. The stylus would not be colour-specific in this case, but it would theoretically behave just like a touch-sensitive screen without pressure control. If this system uses an accurate, miniaturised, active version of the above system, it's an absolute steal at that sort of price. All theory here, of course... EDIT: AHA! Not a passive stylus at all! I found the following line on their site: [quote]Station Receives ultrasonic and infrared signals from the digital pen.[/quote]So it works very much like the whiteboard system I've described above, and not a "touch-screen" at all. Happy me. 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