Low-cost high-resolution non-shadow-mask hybrid LCD-CRT display

Kevin L. Landel; John L. Johnson

doi:10.1117/12.300895

1 February 1998 Low-cost high-resolution non-shadow-mask hybrid LCD-CRT display

Kevin L. Landel, John L. Johnson

Proceedings Volume 3228, Multimedia Networks: Security, Displays, Terminals, and Gateways; (1998) https://doi.org/10.1117/12.300895
Event: Voice, Video, and Data Communications, 1997, Dallas, TX, United States

Abstract

A parent 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: decay 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 decreases 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 state; 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 rates by modulating the decay rate of the phosphors through quenching; and stereoscopic displays without crosstalk through control of left-right phosphor decay rates.

Citation Download Citation

Kevin L. Landel and John L. Johnson "Low-cost high-resolution non-shadow-mask hybrid LCD-CRT display", Proc. SPIE 3228, Multimedia Networks: Security, Displays, Terminals, and Gateways, (1 February 1998); https://doi.org/10.1117/12.300895

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KEYWORDS

Modulation

CRTs

Electron beams

Manufacturing

Chemical reactions

Design for manufacturability

Optical alignment

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