# US 5,707,682 A · Method of manufacturing a phosphor screen

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- Number: US 5,707,682 A
- Document ID: US5707682A
- Status: Granted
- Kind: A
- Application number: 08/756,841
- Filed: 1996-11-26
- Granted: 1998-01-13
- Earliest claimed: 1996-05-16
- Assignees: Videocolor
- Inventors: Himanshu M. Patel; Antimo Pezzulo
- Web page: https://patentgrep.com/patent/US5707682A

## CPC

- H01J 29/327: {Black matrix materials}
- H01J 9/2271: {by photographic processes (final treatment of shadow-mask prior to or after dot deposition H01J9/144)}
- H01J 9/2278: {Application of light absorbing material, e.g. between the luminescent areas}
- H01J: ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS (spark-gaps H01T; electric arc lamps H05B31/00; particle accelerators H05H)

## Abstract

A method of manufacturing a phosphor screen (22) on an interior surface (23) of a faceplate panel (12) is characterized by the steps of: forming a light-absorbing matrix (24) on an interior surface (23) of the faceplate panel (12); applying an aqueous surfactant solution thereto to solubilize oily contaminants and emulsify undissolved oily contaminants of the matrix (24); and serially applying three light-emitting phosphors (G, B, R) to the interior surface (23) of the faceplate panel (12) to form the phosphor screen (22).

## Claims

### Claim 1

A method of manufacturing a phosphor screen on an interior surface of a faceplate panel comprising the steps of:
forming a light-absorbing matrix on an interior surface of said faceplate panel;
applying an aqueous surfactant solution, containing at least two surfactants, thereto, wherein one of said surfactants has a hydrophile liophile balance (HLB) number greater than 16 to solubilize oily contaminants and the other surfactant has an HLB number less than 11 to emulsify undissolved oily contaminants of said matrix, in combination, said two surfactants also reduce erosion of said matrix; and
serially applying three light-emitting phosphors (G, B, R) to said interior surface of said faceplate panel to form said phosphor screen.

### Claim 2 (depends on 1)

The method as described in claim 1, wherein said aqueous surfactant solution is dried to form a thin layer of surfactant, at least on said matrix.

### Claim 3 (depends on 1)

The method as described in claim 1, wherein said surfactants are selected from the group consisting of Pluronic L-92, Pluronic L-72, Pluronic L-62, Triton CF-54, Triton GK-5 and Tween - 20.

### Claim 4 (depends on 3)

The method as described in claim 3, wherein said aqueous surfactant solution has a surfactant concentration of between 0.1 wt. % and 0.2 wt. %, the balance being water.