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Cathode ray tube apparatus

  • US 4,203,051 A
  • Filed: 12/13/1977
  • Issued: 05/13/1980
  • Est. Priority Date: 12/22/1976
  • Status: Expired due to Term
First Claim
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1. Cathode ray tube control apparatus comprising:

  • means to apply a correction factor signal to a cathode ray tube having at least one set of deflection means, each of said correction factor signals being calculated to correct for distortions of the cathode ray tube beam operation when an associated one of a plurality of areas of the cathode ray tube screen is scanned,a digital data store for storing the correction factor signals for each said area of the screen in digital form and,means for reading out digital correction factor signals from the digital data store when the associated area of the screen is scanned and converting the digital signal to analog from before it is applied to the deflection means of the cathode ray tube, in whichthe correction factor signal for each of said areas of cathode ray tube screen has at least two components, a basic correction signal and a fine correction signal, andsaid digital data store has a first portion for storing in digital form the basic correction signal and a second portion for storing in digital form the fine correction signal.

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