Luminance adjusting system for a flat matrix type...

Details Luminance adjusting system for a flat matrix type... Luminance adjusting system for a flat matrix type...

H - Electricity

04

N

355/3, 375/46

H04N 9/16 (2006.01) H04N 5/58 (2006.01)

Patent

CA 1278891

ABSTRACT OF THE DISCLOSURE A flat matrix cathode-ray tube (CRT) in which the brightness of a display picture can be readily adjusted according to environmental brightness is disclosed. In the flat matrix CRT, the matrix is made up of scanning electrodes and data electrodes. The pulse voltage for gradations are applied selectively to the scanning electrodes and the data electrodes so that the picture elements determined by the scanning electrodes and the data electrodes are caused to emit light. Slots, the number of which is determined in correspondence to the number of gradations selected, are provided either in the waveforms of the voltages applied to the scanning electrodes or in the waveforms of the voltages applied to the data electrodes in such a manner that the slots occur at regular intervals.

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