Binary character generator for interlaced CRT display

Claim 1

An apparatus for expanding illuminated picture elements in video display means, comprising: a matrix of picture elements, denoted P X ,Y ; and means for illuminating said picture elements in response to applied signals; means coupled to said video display means, for generating coordinate signals representative of the position of ones of said picture elements on said display means, and for synchronizing said illuminating means with said coordinate positions; means for storing video bit signals, comprising a plurality of addressable storage locations, ones of said locations corresponding to said ones of said picture elements, each of said locations being identified by an x and a y binary coordinate, said video bit signals being stored only in said locations at addresses whose x coordinate has a predetermined first binary digit, and whose y coordinate has a predetermined first binary digit; means, responsive to a signal from said coordinate signal generating means representing a generated coordinate I ,J, for reading said addressable storage locations corresponding to picture elements P I ,J, P I-1 ,J, P I-1 ,J+1, P I ,J+1 ; means coupled to said means for reading addressable storage locations, for generating a Boolean OR sum digital signal from video bit signals read from said locations corresponding to picture elements P I ,J, P I-1 ,J, P I-1 ,J+1, and P I ,J+1 ; and means, coupled to said Boolean OR sum digital signal generating means and said video display means, for generating, in response to a zero digital signal, a first analog signal, and for generating, in response to a one digital signal, a second analog signal, said picture element P I ,J being illuminated by said illuminating means of said video display means, in response to said second analog signal, and said picture element P I ,J being unilluminated by said illuminating means in response to said first analog signal.

Claim 2

An apparatus for expanding illuminated picture elements in video display means, comprising: a matrix of picture elements, denoted P X ,Y ; and means for illuminating said picture elements in response to applied signals; means coupled to said video display means, for generating coordinate signals representative of the position of ones of said picture elements on said display means, and for synchronizing said illuminating means with said coordinate positions; means for storing video bit signals, comprising a plurality of addressable storage locations, ones of said locations corresponding to said ones of said picture elements, each of said locations being identified by an x and a y binary coordinate, said video bit signals being stored only in said locations at addresses whose x coordinate has a predetermined first binary digit, and whose y coordinate has a predetermined first binary digit; means, responsive to a signal from said coordinate signal generating means representing a generated coordinate I ,J, for reading said addressable storage locations corresponding to picture elements P I ,J, P I-1 ,J, P I-1 ,J+1, P I ,J+1 ; means coupled to said means for reading addressable storage locations, for generating a Boolean OR sum digital signal from video bit signals read from said locations corresponding to picture elements P I ,J, P I-1 ,J, P I-1 ,J+1, and P I ,J+1 ; and means, coupled to said Boolean OR sum digital signal generating means and said video display means, for generating, in response to a zero digital signal, a first analog signal, and for generating, in response to a one digital signal, a second analog signal, said picture element P I ,J being illuminated by said illuminating means of said video display means, in response to said second analog signal, and said picture element P I ,J being unilluminated by said illuminating means in response to said first analog signal.