Light pen tracking method and apparatus

Details Light pen tracking method and apparatus Light pen tracking method and apparatus

1979-07-02

1981-07-07

Trafton, David L.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340707, 340771, G08B 536

Patent

active

042777836

ABSTRACT:
An initial location of a light pen (150) placed on the surface of an ac plasma panel (100) is determined by scanning the panel with a two-step finder mode. In the first step, the display sites of every seventh row of display sites of the panel are caused to flash in groups of sixteen until the pen signals that it has detected a flash. The sites in a 60-by-60 site region (306) of the panel are then caused to flash individually to determine the precise pen location (302). A second pen location (312) is determined by scanning the sites of a 32-by-32 scanning patch (311) centered around the initial pen location. Subsequent pen locations are then predicted based on the most recent and second most recent pen locations. Each predicted location (317) is used to determine where a subsequent 32-by-32 scanning patch (316) is to be positioned. The direction in which the pen is moving determines the order in which the sites of each patch are scanned. As each pen location is determined, a line (313,319) is generated in the displayed image connecting it to the previously-determined pen location. This creates the subjective impression of "writing" with the pen.

REFERENCES:
patent: 3337860 (1967-08-01), O'Hara
patent: 3389404 (1968-06-01), Koster
patent: 3506875 (1970-04-01), Watanabe et al.
patent: 3632865 (1972-01-01), Haskell et al.
patent: 3653001 (1972-03-01), Ninke
patent: 3659281 (1972-04-01), Mori
patent: 3938137 (1976-02-01), Ngo et al.
patent: 3949391 (1976-04-01), Benjamin
patent: 4099170 (1978-07-01), Maliszowski et al.

Affiliated with

Also associated with

Rating

Light pen tracking method and apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Light pen tracking method and apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Light pen tracking method and apparatus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-196410