DOT MATRIX CHARACTER DISPLAY DEVICE AND METHOD OF CONVERTING OUTPUT OF DOT MATRIX CHARACTER GENERATOR

摘要

A system for expanding a dot-matrix for characters being displayed on a television raster scan display to improve the readability and resolution of displayed characters without a corresponding increase in the size of the Read-Only Memory (ROM) employed to generate the pattern of dots defining the characters. This result is accomplished by first displaying the identical dot-matrix stored in the ROM for each character in each row of characters to be displayed on the first pass of the raster scan. On the second pass of the raster scan, which is interlaced between the lines of the first pass of the raster scan, a new dot-matrix is inserted according to a predetermined logical real time comparison of the dot matrix of the adjacent rows of the dots produced during the first raster scan.