(19)
(11) EP 0 073 338 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
23.05.1984 Bulletin 1984/21

(43) Date of publication A2:
09.03.1983 Bulletin 1983/10

(21) Application number: 82106659

(22) Date of filing: 23.07.1982
(84) Designated Contracting States:
DE FR GB IT

(30) Priority: 12.08.1981 US 292069
12.08.1981 US 292074

(71) Applicant: International Business Machines Corporation
 ()

(72) Inventors:
  • Dean, Mark Edward
     ()
  • Eggebrecht, Lewis Clark
     ()
  • Kummer, David Allen
     ()
  • Saenz, Jesus Andres
     ()

   


(54) Programmable border color for CRT of color TV


(57) © A central processing unit (10) loads a border register (36) with four color bits representing digital color signals to be used in determining the color of only the border area surrounding the video area of a cathode ray tube display screen (14). A BORDER CONTROL TIME signal is generated at the appropriate times in the horizontal and vertical scanning periods of the cathode ray tube to apply the digital color border signals (R, G, B, I) to a composite video signal generator (38) which generates the composite video signal for a TV set (14) or a TV monitor.






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