Cursor Apparatus for Interactive Graphic Display System.
DEPARTMENT OF THE AIR FORCE WASHINGTON DC
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Graphic data entry in an interactive graphic display system is achieved by means of an apparatus that provides automatic centering of a pointing laser beam on a hand held cursor. The graphic display system provides a means for displaying and comparing through superposition full size overlaid graphical data and projected graphical data on a common display screen. It includes a steerable pointing laser the beam of which scans the display screen in response to a laser beam deflection circuit. The system also includes laser beam position sensing ad indicating circuits which accurately measure the laser beam position. Centering of the laser beam o the cursor at the display screen is accomplished by dithering the beam uniformly about its average position in a discrete dither pattern and utilizing the dither pattern to determine misalignment of the beams average position with respect to the center of the cursor.
- Lasers and Masers
- Computer Hardware