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This device provides for post modulation of a cathode ray tube display image by means of a filter and/or lenses located between the screen and the viewer.
English (United States)
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Display/TV Controlled Filter/Lens Arrangement
This device provides for post modulation of a cathode ray tube display image
by means of a filter and/or lenses located between the screen and the viewer.
The filter/lens arrangement, controlled by video information, comprises a Kerr
chamber or Faraday electromagnetic switch.
As light plane rotation can be controlled via electromagnetic fields in a crystal
or liquid at a speed of at least 5 megahertz, light emanating from a moving raster
on a CRT can be controlled synchronously and the viewer will receive the
information on the phosphor screen plus the information that is allowed to pass
through this device.
Referring to Fig. 1, polarizer 1 lets only polarized light go through. Lens 2 is
rotated 90 degrees with relation to lens 1. In this situation the light does not go
through. The Kerr chamber 3 is a tight enclosure that contains nitrobenzene
within two plates. When an electric field is applied to the plates, the light going
through it will be rotated, this being a rotation proportional to the field and light
distance through the liquid. As the light is rotated, it will then go through the
Thus, applying voltage to the Kerr chamber in concordance with the video
information, a picture can be seen on a white raster screen.
Another application of this principle is to color a white raster with the use of
more than one chamber.
Fig. 2 shows one of the ways three chambers 4, 5 and 6 can be used to
permit a bl...