The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 17, 1977
Filed:
Jun. 11, 1974
Tetsuo Sakai, Tokyo, JA;
Nippon Hoso Kyokai, Tokyo, JA;
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.