Self-test routine and circuit for LED display

Details Self-test routine and circuit for LED display Self-test routine and circuit for LED display

1997-08-14

2000-02-22

Ballato, Josie

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

324770, G01R 3100

Patent

active

060284412

ABSTRACT:
A method and apparatus for operating and executing a self-test routine of an LED display device adapted for assembly into home appliance. The device is comprised of a plurality of LED elements, a control processor, a switch assembly, and a signaling element. The self-test routine comprises disposing the switch assembly in a predetermined pattern for detecting switch operability and initiating a program in the processor for self-testing of illumination of the LED elements. The elements are monitored during the self-test routine for communicating a minimum current level preselected as identifying proper illumination. Failure of the self-test routine to properly detect minimum current levels precludes a proper response from the signaling element within a predetermined time limit, thereby causing the display device to be identified as an unacceptable device.

REFERENCES:
patent: 5268635 (1993-12-01), Bortolini et al.
patent: 5444390 (1995-08-01), Bartlett et al.

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