Radiation imagery chemistry: process – composition – or product th – Producing cathode-ray tube or element thereof – With light-absorbing matrix on faceplate
Patent
1998-06-16
2000-03-14
Rodee, Christopher D.
Radiation imagery chemistry: process, composition, or product th
Producing cathode-ray tube or element thereof
With light-absorbing matrix on faceplate
430119, G03G 1310
Patent
active
060370866
ABSTRACT:
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 thereon, electrostatically charging the photoreceptor 72 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, without substantially discharging the less intensely illuminated areas. The photoreceptor 72 comprises a plurality of layers including a photoresist layer 56, a conductive layer 62, and a photoconductive layer 66. The openings 33 in the color selection electrode 24 have a dimension substantially greater than the dimension of the openings in the resultant matrix 23.
The photoreceptor 72 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 72 is exposed to UV radiation to selectively change the solubility of the photoresist portion 56 thereof into areas of greater and lesser solubility. The photoreceptor 72 is serially developed to expose portions of the interior surface of the panel 12, 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 23. The areas of lesser solubility and the overlying light-absorbing matrix material thereon are removed, thereby forming in the matrix 23 a plurality of openings having a width less than the width of the openings 33 in the color selection electrode 24.
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A.M. Morrell et al., Color Television Picture Tubes, pp. 80-85 (1974).
Cohee Gregory James
Datta, deceased Pabitra
Desai Nitin Vithalbher
Gorog Istvan
Herford Danielle Helene
Irlbeck Dennis H.
Rodee Christopher D.
Thomson Consumer Electronics Inc.
Tripoli Joseph S.
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