Computer graphics processing and selective visual display system – Display peripheral interface input device – Cursor mark position control device
Reexamination Certificate
2005-11-08
2005-11-08
Wu, Xiao (Department: 2674)
Computer graphics processing and selective visual display system
Display peripheral interface input device
Cursor mark position control device
C353S122000
Reexamination Certificate
active
06963331
ABSTRACT:
The invention aims to provide a coordinate input apparatus having high detection reliability and high efficiency and to control the influence of ambient light using a simple structure. The apparatus detects a light spot flashing on and off in a predetermined cycle and incident at a desired position on a coordinate input screen, and includes a detection device having photoelectric conversion elements corresponding to N pixels for detecting a light spot coordinate. The difference between signals from photoelectric elements in light emission state and in light non-emission state at each N pixel is found, and the smaller of the difference signals of the m-th pixel having the maximum difference signal is set as a threshold value. Effective pixels are identified based on the threshold value, and the coordinate is calculated by using the difference data of the selected effective pixels.
REFERENCES:
patent: 5097780 (1992-03-01), Winchester
patent: 5341155 (1994-08-01), Elrod et al.
patent: 5484967 (1996-01-01), Yanagisawa et al.
patent: 5504501 (1996-04-01), Hauck et al.
patent: 5684277 (1997-11-01), Tokioka et al.
patent: 5712658 (1998-01-01), Arita et al.
patent: 5744760 (1998-04-01), Kobayashi et al.
patent: 5793361 (1998-08-01), Kahn et al.
patent: 5831614 (1998-11-01), Tognazzini et al.
patent: 6028595 (2000-02-01), Shiga
patent: 6050690 (2000-04-01), Shaffer et al.
patent: 6081255 (2000-06-01), Narabu
patent: 6-274266 (1994-09-01), None
patent: 7-76902 (1995-03-01), None
patent: WO 89/0701 (1989-08-01), None
Hasegawa Masahide
Kanashiki Masaaki
Kobayashi Katsuyuki
Kobayashi Kiwamu
Tanaka Atsushi
Nguyen Kevin M.
Wu Xiao
LandOfFree
Position information input apparatus and method does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Position information input apparatus and method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Position information input apparatus and method will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3486625