| US 7,450,109 B2 | ||
| Electronic whiteboard | ||
| Michael Austin Halcrow, Austin, Tex. (US); Kylene Jo Hall, Austin, Tex. (US); Dustin C. Kirkland, Austin, Tex. (US); and Herman Rodriguez, Austin, Tex. (US) | ||
| Assigned to International Business Machines Corporation, Armonk, N.Y. (US) | ||
| Filed on Jul. 13, 2004, as Appl. No. 10/889,783. | ||
| Prior Publication US 2006/0012561 A1, Jan. 19, 2006 | ||
| Int. Cl. G06F 3/041 (2006.01) | ||
| U.S. Cl. 345—173 | 12 Claims |
| 1. An improved electronic whiteboard comprising:
a surface under which a substance with light-reflecting particles is contained;
means along a vertical side for drawing horizontal lines across the electronic whiteboard, the horizontal lines drawing means
including visible light reflecting off the light-reflecting particles when turned on;
means along a horizontal side for drawing vertical lines across the electronic whiteboard, the vertical lines drawing means
including visible light reflecting off the light-reflecting particles when turned on;
means for determining when a plurality of vertical lines and a plurality of horizontal lines are drawn; and
means for detecting grid cells created by the plurality of the vertically and the horizontally drawn lines.
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