Why use infrared touch screens?

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An existing infrared touch screen generally comprises an infrared tube-pair array installed on a printed circuit board around a touch detection area. The infrared tube-pair array comprises infrared emitting tubes and infrared receiving tubes. The infrared emitting tubes and the infrared receiving tubes are in a one-to-one correspondence so that the infrared receiving tubes may receive infrared interactive whiteboard light emitted by the corresponding infrared emitting tubes. When there is a touch object in the touch detection area, the light between some of the infrared emitting tubes and the corresponding infrared receiving tubes is blocked by the touch object. The infrared receiving tubes cannot receive the infrared light emitted by the corresponding infrared emitting tubes, whereby location information of the touch object may be determined according to location information of the infrared receiving tubes that cannot receive the infrared light. For the infrared touch frame screen in the prior art, generally the printed circuit board installed with the infrared tube-pair array is installed in a frame. The frame’s strength and flatness would maintain the circuit board’s strength and flatness. Thus it is required to leave a space within the frame to accommodate the infrared tube-pair array and other electronic devices. Since there is usually a gap between the frame and at least one surface of the circuit board, the circuit board is easily deformed. Even if pressed tightly using foam, the frame and the circuit board are contacted at some points, and the frame is. The late immersion of multi-touch sensitive displays enables the use of tangibles on multi-touch screens. There a several wide spread and/or sophisticated solutions to fulfill this need but they seem to have some flaws. One popular system at the time of writing is an overlay frame that can be placed on a normal display with the corresponding size. The frame creates a grid with infrared light emitting diodes. The disruption of this grid can be detected and messages with the positions are sent via USB to a connected computer. This system is quite robust in matters of ambient light insensitivity and also fast to calibrate. Unfortunately it is not created with the recognition of tangibles in mind and printed patterns cannot be resolved. Once a known pattern has been recognized its position and orientation are send with the finger positions towards the interactive white boards software. The usability is tested with an example application where tangibles and finger touches are used in combination. Xiamen Interactive Technology Co., Ltd Add: Floor 1, No.45 Bldg, Wanghai Rd., Software Park Phase 2, Xiamen, China Tel: +86-592-5902910 Fax: +86-592-5902916 Contact Person: Samantha Woo Email: info@cnintech.com; Samantha@cnintech.com; MARKET@cnintech.com Skype: Samantha-intech; maisie-intech MSN: cnintech6@hotmail.com website: