Patent ID: 6037086
Filing Date: 2000-03-14
Classification: H01J

Abstract:
A method of manufacturing a light-absorbing matrix having a plurality of openings formed therein on an interior surface of a faceplate panel of a cathode-ray tube, comprising the steps of:a) forming a photoreceptor, having a plurality of layers including a photoresist layer, a conductive layer, and a photoconductive layer, on said interior surface of said faceplate panel;b) electrostatically charging said photoreceptor to a substantially uniform level of charge;c) inserting a color selection electrode into said panel, said color selection electrode having a major axis and a minor axis with a plurality of openings each having a first transverse dimension along said major axis;d) exposing said photoreceptor to light, through said plurality of openings in said color selection electrode, to selectively discharge the more intensely illuminated areas of said photoreceptor, without substantially discharging the less intensely illuminated areas thereof;e) removing said color selection electrode from said panel;f) contacting said photoreceptor with a suitable liquid toner to form a plurality of toner locations, said toner comprising pigment particles having a charge opposite in polarity to the charge on the less intensely illuminated areas of said photoreceptor;g) reinserting said colorselection electrode into said panel;h) re-exposing said photoreceptor to light to selectively change the solubility of said photoresist portion of said photoreceptor, thereby creating in said photoresist portions areas of greater solubility underlying said toner locations and areas of lesser solubility therebetween;i) serially developing said photoreceptor to expose portions of said interior surface of said panel, while leaving said areas of lesser solubility;j) coating said exposed portions of said interior surface of said panel and said areas of lesser solubility with a matrix suspension;k) drying said matrix suspension to form a light-absorbing matrix; andl) contacting said light-absorbing matrix with a solvent to remove said areas of lesser solubility and the overlying light-absorbing matrix thereon, without removing said light-absorbing matrix from the exposed portions of said interior surface of said panel, thereby forming, in said light-absorbing matrix, said plurality of openings each having a second transverse dimension along said major axis, whereby said first transverse dimension of said openings in said color selection electrode is substantially greater than said second transverse dimension of said openings in said matrix.