System for the display of images in half tones on a matrix...

Details System for the display of images in half tones on a matrix... System for the display of images in half tones on a matrix...

H - Electricity

04

N

375/18

H04N 3/12 (2006.01) G09G 3/36 (2006.01)

Patent

CA 1317043

ABSTRACT OF THE DISCLOSURE The system enables the making of half-tones by using the control circuits of the matrix which are not usually designed for this purpose; it produces no flicker effect. It has a memory image with N (greater than or equal to 2) memory planes to store therein light information relating to each pixel in an N-bit word. The planes are read sequentially and thus make N-l half-tones. In the simplest case (N=2), two planes are used and a first image is produced where any pixel is formed by a first bit, extracted from a first plane, and is preceded and followed, in rows as well as in columns, by a pixel formed by a first bit extracted from the other plane. The addressing is then determined to produce a second image by extracting, in reverse and respectively by each pixel, the second luminance bit in the other memory plane not used for the first image. 27

579680

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