HIGH RESOLUTION SCREEN

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04770A002900020019-0
• Release Decision: RIPPUB
• Original Classification: K
• Document Page Count: 3
• Document Creation Date: December 28, 2016
• Document Release Date: August 30, 2005
• Sequence Number: 19
• Publication Date: March 25, 1965
• Content Type: REPORT

Approved For Release 2005/11/21 : CIA-RDP78B04770A002900020019-0
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March 25, 1965
HIGH RESOLUTION SCREEN
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a.) Higher screen resolution would be
obtained
b.) Wider viewing angles would be
obtained
Declass Review by NGA.
In the final stages of completion of the present
contract with the work effort was re-oriented
slightly in conference discussions between
I Ft
was decided that a screen test program conducted at
I would be more informative than a demonstration
at your facility. In addition it was decided not to
aspherize the lens being manufactured since that would
not contribute to the final test program.
had requested additional funding on the present
contract which was approved and in process. As of
February 15, however, they had to stop work because
the existing funding had been expended. The
additional funding has not been received as yet.
It is expected in early April and at that time work
will be resumed.
The lens elements are being manufactured byl -1
The elements have been completed and
and returned tol for cementing.
will assemble and test the lens wen the cemented
elements are received.
The dichroic filters, for passing the UV light and
reflecting the visible, were received and when in-
stalled in the projector set up will improve the
efficiency. It is expected that the dichroics will
increase the UV intensity at the screen and eliminate
the strong visible violet spot which occured with the
absorption filters previously used. The principal
goal of the present activity was to establish the
feasibility of rear projection viewing of a phosphor
coated screen illuminated by ultraviolet light. It
was believed that:
Approved For Release 2005/11/21 : CIA-RDP78B04770A002900020019-0
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Approved For Release 2005/11/21 : CIA-RDP78B04770A002900020019-0
High Resolution Screen March 25, 1965
c.) Ambient room light could be higher
without interfering with viewing.
The resolution and the viewing angles achieved were
superb, even beyond expectations. The ambient room
light capability is still believed to be good but
has not yet been proven.
Follow on work will be concerned with improving
efficiency and solving some of the engineering design
problems. It has been proposed that the work be
done on a project type contract which will cover
three general related areas:
a.) Continuation of the phosphor in-
vestigations.
b.) Design and manufacture of special
purpose optics.
c.) Development of special purpose light
sources.
The phosphor work will also include some work on
combining electroluminescence with the ultraviolet
excitation of the phosphors. It was not recommended
that design of a prototype rear projection viewer be
initiated yet and that was not included. I believe,
however, that before the follow on work is completed,
it will be possible to define a prototype viewer and
initiate design.
has an interesting development o
an electroluminescent screen activated by a photo-'
conductive layer. I witnessed a demonstration at
on March 4, 1965, by
e demonstration was in effect a p nary con-
firmation of the feasibility of the iscussion
of obtaining electroluminiscence by means of a photo-
conductive coating. Previously, the principles were
not clear to me and I was somewhat ske tical of the
phenomenon actually working. On thel
model, however, it did work so I have much more
confidence in that phase of the proposed work being
realizable.
The Purchase of I Iwas completed on Feb. 26.
E esigned as Presi ent brought
Approved For Release 2005/11/21 : CIA-RDP78B04770A002900020019-0
 Approved For Release 2005/11/21 : CIA-RDP78BO477OA002900020019-0
STAT
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High Resolution Screen
you as head of
to take over.
March 25, 1965
is known to
Approved For Release 2005/11/21 : CIA-RDP78BO477OA002900020019-0