Television – Monitoring – testing – or measuring – Test signal generator
Patent
1992-03-31
1994-11-29
Oberley, Alvin E.
Television
Monitoring, testing, or measuring
Test signal generator
348189, 345 88, 345153, 345904, H04N 968, H04N 931
Patent
active
053694325
ABSTRACT:
A presentation system uses a computer to store and transmit electronic images to a liquid crystal display (LCD) panel which rests on an overhead projector. The LCD panel includes a calibration circuit designed to correct discrepancies in the saturation levels of the three primary colors. The calibration circuit determines the digital values in a signal corresponding to a test pattern of maximum intensity for all three colors, and compares these values to predetermined theoretical values. The differences between these values are recorded as calibration constants and are used to correct the image signals transmitted from the computer. A remote control unit may be used to provide a stimulus to both the computer (to generate the test pattern) and the LCD panel (to execute the calibration process).
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Special Issue NAB 90-vol. 27, 1990, Tokyo 8JP. Takeshi Yoshida-"Multipurpose Pattern Generator for NTSC Video System".
Farnandez Kara A.
Griswold Gary L.
Kirn Walter N.
Minnesota Mining and Manufacturing Company
Musgrove Jack V.
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