Touchpad with active plane for pen detection

Details Touchpad with active plane for pen detection Touchpad with active plane for pen detection

1997-11-14

1999-08-31

Chow, Dennis-Doon

Computer graphics processing and selective visual display system

Display peripheral interface input device

Touch panel

345157, 178 1801, 178 1904, 178 1907, G09G 500

Patent

active

059459808

ABSTRACT:
A touchpad which simulates an active stylus by providing pulses to the entire active plane (making it an active plane), instead of the stylus. This allows a simple, non-active stylus to compress the touchpad to bring the X, Y traces closer to the active plane at the point to be detected. The phase of the pulses applied to the active ground could be chosen to make a stylus look like a finger, or to differentiate it. The pulses are applied synchronously with the standard triangular waveform applied to traces in the trace matrix. The other traces not being sampled at a particular time are truly grounded, and thus are separated from the active plane.

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patent: 5777607 (1998-07-01), Koolen
patent: 5790106 (1998-08-01), Hirano et al.

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