Browse Prior Art Database

Flicker Free Display Generation

IP.com Disclosure Number: IPCOM000096499D
Original Publication Date: 1963-Jun-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 55K

Publishing Venue

IBM

Related People

Hinkein, DJ: AUTHOR

Abstract

A flicker-free display of periodically generated diagrams, other information which is available in updated form only at intervals, is achieved by use of a storage cathode ray tube as an intermediary. In order to avoid perceptible interruption of the display during the time which is required to erase old information prior to storage of updated information, advantage is taken of the decay of the intensity of storage of the old information to discriminate against it.

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Flicker Free Display Generation

A flicker-free display of periodically generated diagrams, other information which is available in updated form only at intervals, is achieved by use of a storage cathode ray tube as an intermediary. In order to avoid perceptible interruption of the display during the time which is required to erase old information prior to storage of updated information, advantage is taken of the decay of the intensity of storage of the old information to discriminate against it.

Updated image information 10, supplied to the buffer-input circuitry of the write controls 12 of storage CRT 14, is written into storage target 18 of CRT at times T0, T1, T2 as signalled via line 16, from the timing control 20. T0, T1, T2 may represent, e. g., one-second intervals.

Due to variations in the characteristics of different areas of target 18, the intensity of useful information stored at time T0 varies as indicated at 22. Storage target 18 is chosen to have a decay rate in the order of two time periods, as indicated at 24.

As soon as the information 10 available at time T0 has been recorded, e. g., at T0 plus 1/30th second, timing control 20 starts raster operation of CRT read control 26 at a flicker-free rate of thirty frames per second. Video signal 28 resulting is fed to difference amplifier 30 where saw-toothed threshold signal 32 is subtracted from it. Signal 32 is provided by generator 34. It has an RC exponential decay shape similar to but smaller than...