# US 5,697,824 A · Method for producing thin uniform powder phosphor for display screens

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- Number: US 5,697,824 A
- Document ID: US5697824A
- Status: Granted
- Kind: A
- Application number: 08/488,066
- Filed: 1995-06-07
- Granted: 1997-12-16
- Earliest claimed: 1994-09-13
- Assignees: Microelectronics and Computer Technology Corporation; SI Diamond Technology, Inc.
- Inventors: Chenggang Xie; Donald E. Patterson; Nalin Kumar
- Web page: https://patentgrep.com/patent/US5697824A

## CPC

- C25D 13/02: with inorganic material
- C25D: PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR

## Abstract

A system and method for producing thin, uniform powder phosphors for field emission display screens features a planarization of the phosphor powder layer. That planarization is accomplished by placing the deposited phosphor layer in an anode plate between two optical flats, which are then mounted within a mechanical press.

## Claims

### Claim 1

A method of making a display device, said method comprising the steps of:
providing an electron emitting device;
depositing a phosphor on a substrate;
planarizing said deposited phosphor with a mechanical press; and
mounting said substrate a specified distance from said electron emitting device.

### Claim 2 (depends on 1)

The method as recited in claim 1 wherein said display device is a flat panel display.

### Claim 3 (depends on 1)

The method as recited in claim 1 wherein said display device is a field emission display device.

### Claim 4 (depends on 1)

The method as recited in claim 1 wherein said planarizing step further comprises the steps of:
placing an optical flat on said deposited phosphor; and
pressing said optical flat towards said substrate with said mechanical press.