High resolution halftone dot generator system including led...

Details High resolution halftone dot generator system including led... High resolution halftone dot generator system including led...

H - Electricity

04

N

95/26, 178/3.1

H04N 1/40 (2006.01) H04N 1/195 (2006.01) H04N 1/405 (2006.01)

Patent

CA 1308666

ABSTRACT OF THE DISCLOSURE A dot generator system is provided wherein an LED microchip array having staggered rows of LED's imaged onto the surface of a rotating exposure drum is controlled to create a multiple exposure beam microdot image on the drum surface in a microdot line by microdot line and scanline by scanline exposure scan. Picture values are compared to microdot density values recalled from a dot density profile array using address values incremented with microdot, flyback and scanline increment values in order to produce exposure data bits indicating whether each active LED on the array is to be turned on. Exposure data bits are accumulated into an exposure data word equal in length to the number of active LED's on the LED array and stagger compensation time delays are applied to exposure bits corresponding to the second and subsequent staggered LED rows to create a timed microdot line exposure on the drum surface.

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