Energy-efficient beam-index displays with programmable power sup

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

1978-11-16

1980-09-30

Richardson, Robert L.

Facsimile and static presentation processing

Static presentation processing

Attribute control

313470, 313471, 315369, 315370, 358 67, 358 74, 358190, H04N 922

Patent

active

042258804

ABSTRACT:
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, responsive 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.

REFERENCES:
patent: 2802964 (1957-08-01), Jesty
patent: 3271610 (1966-09-01), Law
patent: 4163250 (1979-07-01), Tomii et al.

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