Process for preparing a phosphor layer of a cathode ray tube

US5906720A · kind A · utility

Assignee

• AEG Elektronische Rohren GmbH · DE

Inventors

• Mona Ferguson · Ulm, DE
• Michael Gailberger · Neu-Ulm, DE
• Karl Holdik · Ulm, DE
• Anja Keller · Blaustein, DE
• Gunter Maetze · Herrlingen, DE
• Gerhard Gassler · Ulm, DE

Key dates

• Filing date: Jul 24, 1997
• Grant date: May 25, 1999
• Expiry date: Jul 24, 2017

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01J9/225
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

A process for preparing a phosphor layer of a cathode ray tube. To prepare a phosphor layer located on the display screen rear side of the cathode ray tube, the display screen rear side is first coated with an electrically conductive electrode layer consisting of electrically conductive polymers; a solution containing the phosphors or their precursors as well as a solution containing an electrolyte are deposited on the electrode layer; an electric field is applied between the electrode layer and the solution; and the phosphors are electrophoretically deposited on the electrode layer to form the phosphor layer. Since polymers with an evaporation temperature below the destruction temperature of the phosphors are selected, the electrode layer can subsequently be removed by evaporating the polymers.