METHOD OF MANUFACTURING A BLACK MATRIX FOR A CATHODE-RAY TUBE

摘要

A light-absorbing matrix (23), having openings therein, is formed on an interior surface of a faceplate panel (12) of a cathode-ray tube (10) by providing a photoreceptor (72) thereon, electrostatically charging the photoreceptor to a substantially uniform level of charge, and exposing the photoreceptor to light through openings (33) in a color selection electrode (24) to selectively discharge the more intensely illuminated areas of the photoreceptor, whithout substantially discharging the less intensely illuminated areas. The photoreceptor comprises a plurality of layers including a photoresist layer (56), a conductive layer (62), and a photoconductive layer (66). The openings in the color selection electrode have a dimension substantially greater than the dimension of the openings in the resultant matrix (23). The photoreceptor is contacted with a liquid toner having charged pigment particles which form toner lines (84) on the less intensely illuminated areas of the photoreceptor. The photoreceptor is exposed to UV radiation to selectively change the solubility of the photoresist layer thereof into areas of greater and lesser solubility. The photoreceptor is serially developed to expose portions of the interior surface of the panel, while leaving the areas of lesser solubility intact. Next, the interior surface of the panel and the areas of lesser solubility are coated with a matrix suspension which is dried to form the matrix. The areas of lesser solubility and the overlying light-absorbing matrix material thereon are removed, thereby forming in the matrix a plurality of openings having a width less than the width of the openings in the color selection electrode.