Computer graphics processing and selective visual display system – Display peripheral interface input device – Touch panel
Reexamination Certificate
2006-05-23
2006-05-23
Tran, Henry N. (Department: 2674)
Computer graphics processing and selective visual display system
Display peripheral interface input device
Touch panel
C345S176000, C178S018090, C250S559290, C359S199200, C359S199200
Reexamination Certificate
active
07050048
ABSTRACT:
A coordinate input and detection device includes a touch panel, light emitting units, a reflective member, intensity distribution detection units, a coordinate detection unit, and filters. Each of light beams projected from the light emitting units travels and has a sector shape in a direction parallel to a surface of the touch panel. The light beams are reflected by the reflective member and received by the intensity distribution detection units. A coordinate detection unit detects a coordinate value of a position where the light beams are interrupted based on intensity distributions detected by the intensity distribution detection units. The filters are disposed in optical paths in directions perpendicular to directions in which the light beams travel, and have transmission rates varying with respect to positions within the filters.
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