HIGH RESOLUTION SCREEN

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04770A002900020055-0
• Release Decision: RIPPUB
• Original Classification: K
• Document Page Count: 2
• Document Creation Date: December 28, 2016
• Document Release Date: August 30, 2005
• Sequence Number: 55
• Publication Date: August 10, 1964
• Content Type: REPORT

STAT Ile ---6
Approved For Release 2005/11/21: CIA- DP78B04770A002900020055-0
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HIGH RESOLUTION SCREEN
STAT The move of has been postponed until
August 25. They are building a new plant and it will be about
20 miles east of the present location.
The hi h resolution screen is a proprietary concept by
STAi who is program manager for II His concept is to
coat a plastic or glass screen with a transparent phosphor.
When the phosphor is illuminated with ultraviolet light, it
will absorb the ultraviolet and emit visible light. Therefore,
if a continuous tone transparency is illuminated with UV and
projected onto the phosphor, it will be seen in visible light
as though it.originated at the transparent screen.
There appeared to be several striking advantages:
a. Very high resolution could be obtained at the
screen.
b. The brightness lobe of the phosphor would be
expected to be Lambertian so wide viewing angles
are possible.
c. Ambient room light would pass through the trans-
parent screen and could be absorbed in the structure
with very little reflection and so would not affect
the contrast of the image on the screen.
ISTAT
STAT
'STAT
Since this was a brand new concept, a feasibility study seemed
to be the best approach.
The phosphor coating research was subcontracted to
gste
parent company of
quickly showed that the phosphor screens
would readily resolve 100 lines/mm at the screen. He could
also reproduce step wedges and get good gray scale rendition
in continuous tone images. He also found that the brightness
of the visible light from the phosphor could be increased to
the dazzling point by increasing the UV.
Declass Review by NGA.
Approved For Release 2005/11/21: CIA-RDP78BO477OA002900020055-0
 Approved For Oase 2005/11/21 : CIA-RDP78B0477.02900020055-0
High Resolution Screen August 10, 1964
STAT
Jhas completed his experimental work and is analyzing
the results. The inorganic phosphors were very dim and essentially
not useable. Certain organic phosphors gave adequate brightness,
but the organic dyes seemed to give best results. Some color
control can be obtained by mixing dyes. 0 will select
the best ones for making coatings for a feasibility demonstra-
tion.
I believe it is important that the best phosphor be selected
for a feasibility demonstration and, if successful, prototype
projector equipment for using the technique be considered.
In addition, I believe a long term continuation of the phosphor
? search program should be initiated since they have really
only scratched the surface of the possibilities.
One of the major problems of the program will be obtaining
STAG high intensity UV light. 0 will use a 2-1/2 KW mercury
apor lamp filtered to pass the 3650 Angstrom UV line and the
461 Angstrom greexiline. F- designed a
U'esi special projection lens for these wavelengths . The lens
"" t4design is complete and he is about to start manufacturing.
i
b
f
b
n Octo
er
or
e ready
get good delivery, they expect to
the feasibility demonstration.
0
Approved For Release 2005/11/21: CIA-RDP78BO477OA002900020055-0