Light guide plate and method for the production thereof

US10466406B2 · kind B2 · utility

Assignee

• Evonik Röhm GmbH · DE

Inventors

• Herbert Groothues · Frankfurt, DE
• Jann Schmidt · Darmstadt, DE
• Wangelis Karampougioukis · Darmstadt, DE
• Stephan Neumayer · Frankfurt, DE
• Helmut Haering · Reinheim, DE
• Berthold Schoenig · Roßdorf, DE

Key dates

• Filing date: Jul 3, 2014
• Grant date: Nov 5, 2019
• Expiry date: Jul 7, 2036

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B6/0065
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

A process for producing a light guide plate includes producing a colorless transparent sheet from a colorless transparent material by extrusion with a polishing stack. A printed reflector film is laminated in-line to the colorless transparent sheet. The printed reflector film includes: a thermoplastic reflector film which is opaque white or translucent white and made of a thermoplastic material; and a colorless thermoplastic printed on the thermoplastic reflector film. There is no direct optical contact between the colorless transparent sheet and the thermoplastic reflector film. A glass transition temperature of the printed colorless thermoplastic is above 25° C. and below glass transition temperatures of the colorless transparent material of the colorless transparent sheet and of the thermoplastic material of the thermoplastic reflector film.