Noise reduction in video display apparatus

摘要

An analog video frame store, resident in certain types of video displays, is used to obtain video signal noise reduction. A frame storage system has an array of semiconductor-controlled storage units for receiving and storing frames of video information as a pattern of stored charge. A circuit is provided for applying sampled portions of the video signals to respective ones of the elemental storage units of the frame storage system. The circuit is operative to apply the sampled portions of the video signals to their respective semiconductor unit storage regions with a time constant for each particular storage unit that depends upon the difference between the sampled signal level being applied to the particular storage unit and the signal level stored at the particular storage unit. The stored charge is converted into a viewable image by using a deformable material whose shape is affected by the charge pattern and an optical subsystem for generating the viewable image as a function of the shape of the deformable material.