Engineers at Siemens Communications have developed a laboratory model of a cellphone with an integrated projector. They demonstrated the device at CeBIT 2005 in Hanover. The unit's keypad or display can be projected onto a surface using the phone's swivel handle, where the projector unit with a powerful laser diode is mounted. Depending on how the swivel handle is turned, the image can be projected onto the housing, a flat surface or a wall, so the system can be used for presentations to small groups.
The device works in conjunction with an electronic pen that can be used to write on the virtual keypad and also serves as a Bluetooth headset with a built-in microphone and speaker. The researchers used a mix of ultrasound and infrared to register the pen's movements. The pen point continuously sends infrared flashes to a sensor in the phone's housing, forming the basis for the starting point of subsequent measurements. The point also emits ultrasound signals that are registered at two spots in the housing. Special software then determines the pen's exact position based on the time difference between the two signals.
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