Image display device

Details Image display device Image display device

1974-06-11

1977-05-17

Trafton, David L.

Communications: electrical

Systems

Portable self-contained

358240, 315169TV, 340166EL, H01J 1748

Patent

active

040245292

ABSTRACT:
An image display device, particularly a gas discharge image display device comprising a plurality of display elements arranged in a matrix at every picture element and a plurality of driving circuits, the display elements being composed of either radiating elements or light quantity control elements, the voltage of a gradually varying waveform such as a saw-tooth waveform being supplied to a common bus connected to the emitters of semiconductors such as FETs, bipolar transistors or the like which provide the driving circuit for controlling currents flowing through the display elements, the level whereby the driving current is clipped being continuously varied so as to control effectively the currents flowing through the display elements, and the currents being subjected to one of amplitude modulation and a combination of amplitude modulation and duty time modulation in accordance with the level of the image signal.

REFERENCES:
patent: 3559190 (1971-01-01), Bitzer et al.
patent: 3627924 (1971-12-01), Fleming et al.
patent: 3733435 (1973-05-01), Chodil et al.
patent: 3742483 (1973-06-01), Ogle
patent: 3883778 (1975-05-01), Kaji et al.

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