Ultraviolet light projects photographically produced images on a screen composed of a mixture of linear and nonlinear phosphors whose spectral emissions are different. This allows the display of polychromatic luminescent images, which gives better discrimination of the objects being viewed

Hilborn, E. H.

English

NASA Technical Reports Server

linear phosphors, the red predominates at a current of 
one microampere and the green predominates at a 
current of ten microamperes. Many different hues 
result with the varying electron beam currents. The 
figure illustrates apparatus employing the novel 
composition in a luminescent screen. 
The practice of the present invention affords the 
display of polychromatic luminescent images under 
extremely reliable conditions. Over the brightness 
range available with a monochromatic transparency, 
it is possible to differentiate approximately ten bright-
ness levels. However, when viewing a polychromatic 
image, it is possible for an observer to discriminate 
about 200 separate hues at a constant brightness level. 
Thus, image displays are available to indicate in 
different colors, giving a better discrimination of the 
objects being viewed. The simplicity of producing the 
multicolor display screens and their reliability repre-
sent important advantages in the use of this apparatus. 
Note: 
Requests for further information may be directed to: 
Technology Utilization Officer 
	
The luminescent composition for the tube face of 	 Headquarters 
	
conventional cathode ray tubes (çRT's) is deposited	 National Aeronautics 
	
as selectively positioned dots. This conventional ar- 	 and Space Administration 
	
rangement of dots necessitates the use of an aperture 	 Washington, D.C. 20546 
	
mask and multiple electron guns. In the present 	 Reference: B70-10440 
	
invention, the composition is a mixture of nonlinear 	 Patent status: 
	
phosphors and linear phosphors. Thus, the phosphor	 This is the invention of a NASA employee and a 
	
dot pattern, the shadow mask, and two of the three 	 patent application has been filed. Inquiries concern-
	
electron guns are eliminated by substituting an overall 	 ing license rights may be made to the inventor, Mr. 
	
smooth coating of a mixture of the linear and non- 	 Edwin H. Hilborn, through NASA Headquarters. 
	
linear phosphors and a single gun. By varying the elec- 	 Source: Edwin H. Hilborn 
	
tron beam exciting current, different colors become	 Electronics Research Center 
	
visible. With the mixture of linear phosphors and non- 	 (ERC-10010)
Category 01 
A luminescent screen composition has been de-
veloped upon which the photographically produced 
image is projected, usually from a transparency, by 
means of ultraviolet light. The composition includes 
a mixture of a plurality of phosphors whose spectral 
emissions are different. When excited, the phosphors 
emit their characteristic color. 
Positioning 
•_,fl
Means	 - 
•
v)--- 1----
	
Observer 
UV Source	 ...	 UV Absorbing 
Filter 
Photographic	 Luminescent 
Film	 Screen 
October 1970	 Brief 70-10440 
NASA TECH BRIEF 
NASA Tech Briefs announce new technology derived from the U.S. space program. They are issued to encourage commercial 
application. Tech Briefs are available on a subscription basis from the Clearinghouse for Federal Scientific and Technical 
Information, Springfield, Virginia 22151. Requests for individual copies or questions relating to the Tech Brief program may 
be directed to the Technology Utilization Division, NASA, Code UT, Washington, D.C. 20546. 
Luminescent Screen Composition and Apparatus 
This document was prepared under the sponsorship of the National 	 Government assumes any liability resulting from the use of the 
Aeronautics and Space Administration. Neither the United States 	 information contained in this document, or warrants that such use 
Government nor any person acting on behalf of the United States	 will be free from privately owned rights.
https://ntrs.nasa.gov/search.jsp?R=19700000425 2020-03-17T00:50:19+00:00Z


Luminescent screen composition and apparatus

Abstract

Similar works

Full text

Available Versions

NASA Technical Reports Server