Energy-efficient beam-index displays with programmable power...

Details Energy-efficient beam-index displays with programmable power... Energy-efficient beam-index displays with programmable power...

H - Electricity

01

J

355/13

H01J 29/70 (2006.01) H04N 9/22 (2006.01)

Patent

CA 1140270

ABSTRACT OF THE DISCLOSURE Programmable power supplies are made responsive to beam-index and timing signals in order to automatically control the size and position of the display on a cathode ray tube. The high voltage power supply is also made programmable, re- sponsive to video signal content, to reduce the energy stored in the high voltage circuits. Savings in energy consumption are also obtained by efficiently modulating the target screen of a beam-index type color cathode ray tube. Energy lost at the target screen is less than 10% compared to approximately 70% for a conventional color tube, an improvement factor of 7:1 or more.

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