US Patent No. 10,068,509

FAULT DETECTION FOR A DISPLAY SYSTEM


Patent No. 10,068,509
Issue Date September 04, 2018
Title Fault Detection For A Display System
Inventorship Mark Fletcher, Cumming, GA (US)
Ronald Christian, Alpharetta, GA (US)
William Cumby, Johns Creek, GA (US)
Assignee L-3 COMMUNICATIONS CORPORATION, New York, NY (US)

Claim of US Patent No. 10,068,509

1. A method for detecting a fault in a display system including an active matrix liquid crystal display (AMLCD), comprising:embedding fault detection data into a portion of a digital video stream that will not be displayed by the AMLCD, the AMLCD comprising:
cascaded source and gate driver shift registers with associated return pulse circuitry; and
a return pulse detector unit that detects return pulses from the shift registers;
transmitting the digital video stream, with the embedded fault detection data, to the AMLCD;
receiving detected fault detection data, detected by the AMLCD, from the AMLCD;
comparing the embedded fault detection data with the received detected fault detection data detected by the AMLCD;
receiving, from the return pulse detector, timing error data indicating whether a timing error occurred in the AMLCD, the timing error data generated by a timing and control circuit coupled to the AMLCD; and
determining whether there is a fault in the AMLCD or in a path of the digital video stream based on results of the comparison and upon the received timing error data.