Patent ID: 6597371
Filing Date: 2003-07-22
Classification: G09G

Abstract:
Apparatus responsive to a digital file containing XÂ·Y N-bit words, each N-bit word uniquely defining one of 2N pixel values, for forming a gray or color scale image on a matrix of XÂ·Y addressable pixels where XÂ·Y&gE;10000, said apparatus comprising:a pixel value source supplying each of said N-bit words at a rate F1; an oversampling data modulator; said data modulator being responsive to each supplied N-bit word for producing an output stream of M-bit words, each M-bit word uniquely defining one of 2M pixel intensity levels, at a rate F2 where N>M and F1means applying each such output stream to an associated one of said addressable pixels such that each output stream directly modulates its associated pixel to produce a light output which can be readily filtered by a human eye to extract an apparent gray or color scale image; said data modulator comprising an accumulator; an adder for adding each supplied N-bit word to an associated residue stored in said accumulator to produce a sum and an M-bit word; a feedback path for adding each produced sum to the associated residue stored in said accumulator; and wherein each of said output streams is formed by said produced M-bit words.