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Cathode Ray Tube Display Phosphor Mixture

IP.com Disclosure Number: IPCOM000080338D
Original Publication Date: 1973-Dec-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Cartlidge, H: AUTHOR [+2]

Abstract

In cathode-ray tube (CRT) display systems utilizing a so-called "light pen", it is desirable that the CRT have a fast rise characteristic for specific cooperation with the light pen, and a slow decay characteristic so that a high-refresh rate is not necessary to produce a flicker-free display to the eye of an observer.

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Cathode Ray Tube Display Phosphor Mixture

In cathode-ray tube (CRT) display systems utilizing a so-called "light pen", it is desirable that the CRT have a fast rise characteristic for specific cooperation with the light pen, and a slow decay characteristic so that a high-refresh rate is not necessary to produce a flicker-free display to the eye of an observer.

This result may be accomplished by utilizing a mixture of two phosphors, one of which provides fast response for operation of the light pen and the other of which provides persistent response to reduce the flicker in the display. The phosphors are selected to emit the same color, so that the human eye does not perceive two different color flashes with annoying flicker from that source.

An example of a desirable mixture for this purpose, given in dry powder rate ratio, is 0.75 Zn(2)SiO(4):Mn,As + 0.25 ZnS:Cu.

The first of these phosphors is long persistent, and the second has vast rise characteristics. The short persistent phosphor and the long persistent phosphor, composited in a single layer, are both excited by the electron beam and the excitation energy lost through energy conversion is minimized. Since the emissions of the phosphors are similar, the display appears as monochrome.

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