Pointed position detection device and pointed position...

Details Pointed position detection device and pointed position... Pointed position detection device and pointed position...

2007-02-20

2007-02-20

Lefkowitz, Sumati (Department: 2629)

Computer graphics processing and selective visual display system

Display peripheral interface input device

Light pen for crt display

C345S179000, C345S182000, C345S183000, C348S742000, C348S743000

Reexamination Certificate

active

10651655

ABSTRACT:
A field sequential color projector includes an area sensor unit having an area sensor for photographing a screen, and an optical filter for permitting only a red light having the same color as a laser beam from a laser pointer to be input to the area sensor, and a color period/timing extraction unit which extracts timings for projecting red, green, and blue images. When a projection timing for a red image arrives while an image is projected, an MPU (Micro Processor Unit) receives a light of an image projected on the screen at that time to acquire image information, and detects a position pointed by the laser beam based on the acquired image information. Even if there exists a portion having the same color as the laser beam in the projected image, a pointed position detection device accurately detects the position irradiated by a pointing light of the laser pointer.

REFERENCES:
patent: 5831601 (1998-11-01), Vogeley et al.
patent: 5914783 (1999-06-01), Barrus
patent: 6331848 (2001-12-01), Stove et al.
patent: 6798926 (2004-09-01), Hiramatsu
patent: 7091949 (2006-08-01), Hansen
patent: 2001/0028341 (2001-10-01), Kitazawa
patent: 2003/0222849 (2003-12-01), Starkweather
patent: 0 690 409 (1998-01-01), None

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