Browse Prior Art Database

Display/TV Controlled Filter/Lens Arrangement

IP.com Disclosure Number: IPCOM000050799D
Original Publication Date: 1982-Dec-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Converso, PP: AUTHOR

Abstract

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.

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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 polarizer 2.

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...