1. A printer for depositing a polymer coating on a display backing according to the presence of assigned numerical values of functions in data in an image which varies in density according to the presence of assigned numerical values of functions in the data values which are to be represented on the display backing as various colors by color toners which adhere to the deposited polymer coating, comprising: a. light source means for illuminating the polymer coatings to be deposited with ultraviolet light; b. a display backing for receiving photopolymer deposited thereon; c. a sheet of laminate containing photopolymer for deposition onto said display backing; d. a base for receiving said display backing with said sheet of laminate superimposed on said display backing; e. an image varying in density according to the presence of assigned functions, said image being mounted above said sheet of laminate; f. an optical screen for forming the ultraviolet light into discrete areas through said image and said sheet of laminate onto said display backing; and g. means for holding said screen means and said positive image in position with respect to said sheet of laminate and said display backing during illumination by said light source means for illuminating wherein a polymer coating is deposited.