Effect On CRT Processing Of Specifications Limiting The Numbers Of Ultrafine Blemishes

Donald M. Phillips; Wendell L. Plummer

doi:10.1117/12.970243

16 August 1983 Effect On CRT Processing Of Specifications Limiting The Numbers Of Ultrafine Blemishes

Donald M. Phillips, Wendell L. Plummer

Proceedings Volume 0386, Advances in Display Technology III; (1983) https://doi.org/10.1117/12.970243
Event: 1983 Los Angeles Technical Symposium, 1983, Los Angeles, United States

Abstract

Question - How does Westinghouse make a cathode ray tube with the level of screen quality required by today's high performance systems. Answer - Very carefully! Thirty years ago in the heyday of the monochrome CRT for TV application, the quality levels for 21" tubes allowed 30 mil and even 40 mil blemishes. The resolution of the system and the application did not require any more. Even with these quality standards we had difficulty making very high yields. In recent years the performance of our CRTs in military and commercial systems has been regularly improved to maintain contact with the needs of our customers. We are no longer dealing with a display of 300 TV lines as was common in early commercial TV. Today our products are capable of 4000 line resolution (slightly less than 1 mil spot size for a 4" raster). These tubes are used in a stroke application. They also meet requirements such as uniform brightness and peak brightness which were not needed a few years ago.

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Donald M. Phillips and Wendell L. Plummer "Effect On CRT Processing Of Specifications Limiting The Numbers Of Ultrafine Blemishes", Proc. SPIE 0386, Advances in Display Technology III, (16 August 1983); https://doi.org/10.1117/12.970243

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