Stylus position detection system for optical touch panel

Details Stylus position detection system for optical touch panel Stylus position detection system for optical touch panel

1989-11-13

1992-04-21

Weldon, Ulysses

Communications: electrical

Land vehicle alarms or indicators

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

340706, 178 18, 250221, G06K 1106

Patent

active

051072530

ABSTRACT:
A detection circuit (30, 32) for carrying out a rapid search technique for locating the position of a stylus (12) relative to a display screen (10). A microprocessor (34) and related components select a group of light detectors (20, 28) that are positioned near the display screen (10). The summed output current of the selected group of detectors (20, 28) is monitored to determine whether the output of any detector in the selected group is reduced because of the presence of a stylus (12). Whenever the selected group shows such reduction in output current, that selected groups is divided into two subgroups. The subgroup having reduced current output due to the presence of the stylus (12) is further divided until the particular detector(s) having reduced output current is found, the position of the detector is correlated to the location of the stylus (12) relative to the screen (10).

REFERENCES:
patent: 3764813 (1973-10-01), Clement et al.
patent: 3775560 (1973-11-01), Ebeling et al.
patent: 4243879 (1981-01-01), Carroll et al.
patent: 4645920 (1987-02-01), Carroll et al.
patent: 4684801 (1987-08-01), Carroll et al.
patent: 4722259 (1988-02-01), Deutsh et al.
patent: 4766425 (1988-08-01), Tallman et al.
patent: 4845346 (1989-07-01), Ouchi et al.

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