Short-throw projectors are nothing new, but Hitachi’s latest does bring something different to the table: in fact it creates a table-top projected touchscreen surface. Pairing the company’s CP-A100J short-throw projector and the UPIC Plus Wireless Interactive Panel 56-M, the system can recognize and track a digital pen as it moves across the huge 56-inch projection screen.





Unlike the resistive-type touch screen, capacitive touch screen used in you G1, Storm or iPhone registers electricity in your finger, it will not operate properly with a gloved hand, fingernail or with a mechanical stylus; thus handwriting input devices are difficult to implement.
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