Electronic blackboard interface

Details Electronic blackboard interface Electronic blackboard interface

1993-02-26

1993-12-28

Chin, Tommy P.

Computer graphics processing and selective visual display system

Display peripheral interface input device

Touch panel

178 20, 345173, G09G 302

Patent

active

052743624

ABSTRACT:
An interface for an electronic blackboard and more particularly a method and apparatus for determining the X-Y coordinates of a point on a writing surface and the output of the point on a video display device on a real-time basis wherein the electronic blackboard display system has both a contact mode and a self-calibration mode. The self-calibration mode is functional during times of non-contact. Contact signals from the electronic blackboard are digitized and displayed on a video display terminal in a color corresponding to a pen tray signal. The microprocessor can also output signals through a modem to a remote video display terminal.

REFERENCES:
patent: 4317956 (1982-03-01), Torok et al.
patent: 4476463 (1984-10-01), Ng et al.
patent: 4484026 (1984-11-01), Thornburg
patent: 4501931 (1985-02-01), Ohya et al.

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