Patent ID: 6939189

Claim:
A method of forming a patterned phospho structure having red, green and blue sub-pixel elements for an AC electroluminescent display, comprising: selecting at least a first and a second phosphor, each emitting light in different ranges of the visible spectrum, but whose combined emission spectra contains red, green and blue light; depositing and patterning said at least first and second phosphor in a layer to form a plurality of repeating at least first and second phosphor deposits arranged in adjacent, repeating relationship to each other; and providing one or more means associated with one or more of the at least first and second phosphor deposits, and which together with the at least first and second phosphor deposits, form the red, green and blue sub-pixel phosphor elements, for setting and equalizing the threshold voltages of the red, green and blue sub-pixel phosphor elements and for independently setting the relative luminosities of the red, green and blue sub-pixel elements so that they bear set ratios to one another at each modulation voltage used to generate the desired luminosities for red, green and blue; and optionally annealing the patterned phosphor structure so formed.