Control device using light-emitting diodes for both manual input

Details Control device using light-emitting diodes for both manual input Control device using light-emitting diodes for both manual input

1985-06-27

1987-09-08

Caldwell, Sr., John W.

Communications: electrical

Audible indication

Percussion-type sound producer

250221, 357 19, G08C 2100

Patent

active

046927395

ABSTRACT:
A light-emitting diode is used both for receiving data from an operator to change the logic state of a device and for displaying the entered data back to the operator. Current is selectively applied to the diode to display the data, but on an alternate basis the photo-current produced in the light-emitting diode by surrounding illumination is sensed and the data are received by detecting the fall-off in the photo-current caused by the operator covering the light-emitting diode. This technique is advantageously employed for the input and display of ink slide settings for a rotary printing machine by using a light-emitting diode matrix or bar graph display subject to finger-tip control by the operator. The diode matrix is scanned by repetitively and sequentially inhibiting the lighting current to the individual light-emitting diodes so that they may be sequentially connected to a photo-current monitoring circuit via a multiplexer under control of a clock circuit.

REFERENCES:
patent: 3340401 (1967-09-01), Young
patent: 3621268 (1971-11-01), Friedrich et al.
patent: 3737668 (1973-06-01), Ellis et al.
patent: 3860754 (1975-01-01), Johnson et al.
patent: 4049964 (1977-09-01), Wuchinich et al.
patent: 4514817 (1985-04-01), Pepper et al.
T. F. Cummings--"Transparent Keyless Keyboard for Variable Terminal Applications"--IBM Technical Disclosure Bulletin--vol. 20, No. 4--Sep./77--pp. 1609-1611.

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