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. 03, 1977
Filed:
Jan. 27, 1975
Hitachi, Ltd., , JA;
Abstract
Red, blue and green color difference signals are supplied to the bases of first, second and third transistors amplifying the tri-color signals of red, blue and green, and a luminance signal is introduced to the emitter of each transistor through a parallel circuit of two resistors. One of the resistors in each parallel circuit is connected through a switch. The switches are associatively operated so that the on-off operation of the switch connected to the emitter of the first transistor is opposite to that of the switches connected to the emitters of the second and the third transistor. By operating the switches, the amplification degree of the first transistor is increased and simultaneously the amplification degrees of the second and third transistors are decreased, and therefore an image with red emphasized can be obtained with no change in luminance.