Video display apparatus for pictures with different aspect ratio

Details Video display apparatus for pictures with different aspect ratio Video display apparatus for pictures with different aspect ratio

1989-01-26

1993-03-09

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358142, H04N 508, H04N 708

Patent

active

051930064

ABSTRACT:
When a picture display section (or screen) for high-quality TV system (HDTV system) is used for displaying pictures of ordinary TV system with an aspect ratio different from that of the high-quality TV picture, the blank portions on the screen where no picture is illuminated to display at a brightness level almost equal to a picture mean luminance so that there will be no local variations in the luminace on the screen due to deterioration of fluorescent materials on the screen. For this purpose, the picture display portion is moved over the screen; or the video signals are attenuated toward the ends of the picture display portion. As a result, the variations in luminance on the screen become small and unnoticeable.

REFERENCES:
patent: 4670784 (1987-06-01), Goldberg

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