Solution for making a photoconductive layer in dry-electrophotographically manufacturing a screen of a CRT and method for dry-electrophotographically manufacturing the screen using the solution
AssigneeOrion Electric Co., Ltd.
InventorsSang Youl Yoon, Ho Seok Shon
Life of this patent
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Abstract
Disclosed are a solution for making a photoconductive layer in dry-electrophotographically manufacturing a screen of a cathode ray tube and a method using solution. By the solution, the photoconductive layer can be stored for long time and reveals a superior photoconductivity. The solution has tetraphenyl ethylene derivatives as an electron donor material responsive to the ultraviolet rays, which has structural formula (I), in which R is H, CH3, C2H5, C3H7, OCH3, OC2H5, OC3H7, or COCH3, on a condition of excepting a case where R1═R2═R3═R4═H.
Claims1
A solution for making a photo-conductive layer employed in a method for electro-photographically manufacturing a screen of a cathode ray tube utilizing dry-powdered phosphor particles, the method comprising the steps of:
- forming a volatile conductive layer on an inner surface of a panel;
- forming a volatile photo-conductive layer on the volatile conductive layer, the volatile photo-conductive layer containing a material responsive to ultraviolet rays;
- charging the volatile photo-conductive layer with uniform electrostatic charges;
- exposing the volatile photo-conductive layer to an ultraviolet ray source, so as to selectively discharge the electrostatic charges from the volatile photo-conductive layer;
- and attaching the dry-powdered phosphor particles charged with electrostatic charges to the volatile photo-conductive layer;
- wherein the solution comprises a tetraphenyl ethylene derivative as an electron donor material responsive to the ultraviolet rays, which has a following structural formula,
- in which R is H, CH3, C2H5, C3H7, OCH3, OC2H5, OC3H7, or COCH3, on a condition of excepting a case where R1═R2═R3═R4═H;
- the tetraphenyl ethylene derivative being dissolved together with trinitro-fluorenone, ethyl anthraguinone and polystyrene-oxazoline copolymer in toluene to form the solution, in which the polystyreneoxazoline copolymer is 10% by weight of the toluene and the tetraphenyl ethylene derivative is 20% by weight of the polystyrene-oxazoline copolymer and the trinitrofluorenone and the ethyl anthraguinone are respectively 10% by weight of the tetraphenyl ethylene derivative.
Dependencies are inferred from the claim text.