Method of low cost self-test in a video display system system

Details Method of low cost self-test in a video display system system Method of low cost self-test in a video display system system

1987-10-26

1988-09-20

Britton, Howard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

324121R, 358 10, H04N 1704

Patent

active

047729481

ABSTRACT:
In a color graphics display system, video analog self-test hardware for testing the system elements between the frame buffer and the CRT display monitor is provided including a bi-directional data bus between the graphics processor and the color map, an analog comparator, an integrator, and an analog multiplexor. The self-test method includes calibrating the self-test circuitry with respect to a reference voltage. The method next includes testing the DACs by outputting predetermined bit patterns to each of the DACs via the frame buffer, measuring each DAC output level in response to each input bit pattern, comparing the DAC output levels to predetermined limits, and reporting the results. Provision is made also for testing the system clock.

REFERENCES:
patent: 4536760 (1985-08-01), Navarro
patent: 4607288 (1986-08-01), Freyberger
patent: 4628254 (1986-12-01), Bristol
patent: 4700227 (1987-10-01), Liebel

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