Large screen video display comprising a matrix array of cathode-ray tubes operated at increased vertical and horizontal scan rates

A device for displaying a large-size television picture, comprising:

• a plurality of cathode-ray tubes placed next to one another to form a matrix of N rows and M columns (N and M being integers greater than 1), each cathode-ray tube containing at least one electron beam which displays a rectangular portion of the picture to be displayed on a luminescent screen;
• a plurality of optical devices located adjacent to the luminescent screens, each said optical device being associated with one lluminescent screen, said optical devices acting to enlarge the picture portions displayed on the screens in such a manner that the enlarged picture portions appear contiguous in spite of joints between the cathode-ray tubes;
• a plurality of picture-portion memories, each said memory being associated with one cathode-ray tube and storing data corresponding to the picture portion displayed on the associated cathode-ray tube;
• means for controlling the memories;
• and
• scanning means to display each picture portion with a vertical scan having a period at least N times less than the period of a vertical analysis scan used to analyze an image to be displayed as said large-size television picture.