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Proceedings Paper

Patent approved: a hybrid CRT design for advanced TV and other large-format digital displays
Author(s): Kevin L. Landel; John L. Johnson
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Paper Abstract

A patent has been awarded for a new CRT design that eliminates the internal shadow mask, and promises a bright, rugged, high-resolution/large-format, multiscan/multi-sync display with potentially low manufacturing costs. The design incorporates a light-valve within the CRT. Modulation of the electron gun and the function of the shadow mask are replaced by two chemical reactions typical of phosphors: decays stimulation and quenching. These reactions are controlled through illumination of the phosphors by non- visible light projected through the light-valve. The image is generated in traditional raster form, but with a single, non-modulated electron gun; control of each pixel is made through modulation of the light-valve. The design decrease manufacturing alignment requirements and eliminates the need to focus the electron gun. Advantages include: high-G resistance due to elimination of the shadow mask; brighter displays because the electron beam is not occluded or absorbed by the shadow mask; elimination of decay rate as a parameter in phosphor choice and frame rate; and digital interfacing to image sources. Applications include: large- format displays without the physical constraints of the shadow mask and by elimination of distortion control requirements of the electron beam at the image edges; variable frame rates by modulating the decay rate of the phosphors through quenching; and stereoscopic displays without crosstalk through control of left-right phosphor decay rates.

Paper Details

Date Published: 17 April 1998
PDF: 9 pages
Proc. SPIE 3296, Projection Displays IV, (17 April 1998); doi: 10.1117/12.305533
Show Author Affiliations
Kevin L. Landel, Media Technology Group (United States)
John L. Johnson, U.S. Army Missile Command (Germany)

Published in SPIE Proceedings Vol. 3296:
Projection Displays IV
Ming Hsien Wu, Editor(s)

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