Light redirecting film

US11749769B2 · kind B2 · utility

Assignee

• 3M INNOVATIVE PROPERTIES COMPANY · US

Inventors

• Vivian W. Jones · Woodbury, US
• Gary E. Gaides · Woodbury, US
• Stephen A. Johnson · Woodbury, US
• Nathaniel I. Lehn · White Bear Lake, US
• Jiaying Ma · Maplewood, US
• Adam T. Ringberg · Okabena, US
• Tianyu Wu · Okabena, US
• Fuming B. Li · Woodbury, US

Key dates

• Filing date: Dec 9, 2020
• Grant date: Sep 5, 2023
• Expiry date: Dec 9, 2040

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02E10/52
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A light redirecting film includes a first layer disposed on a second layer with structured major surfaces of the first and second layers facing each other. An optically reflective layer or a metal layer is disposed between the first and second layers. The first layer can be a hot melt adhesive layer and the second layer can be a polymeric layer. The first and second layers can be unitary layers. The first layer can be a first polymeric layer having a softening temperature T1 and the second layer can be a second polymeric layer having a softening temperature T2 greater than T1. Heating and/or applying pressure to the film changes an optical characteristic of the film by less than about 5%.