Light redirecting film and display system incorporating same

Patent metadata

Field	Value
Publication number	US-2019094418-A1
Application number	US-201816186046-A
Country	US
Kind code	A1
Filing date	Nov 9, 2018
Priority date	May 28, 2010
Publication date	Mar 28, 2019
Grant date	—

Abstract

Optical films for redirecting light are described, and optical systems, such as display systems, incorporating such optical films are described. The optical film may include a first structured surface including a plurality of prismatic structures, and a second structured surface opposing the first structured surface and including a plurality of microstructures. An effective transmission of the optical film is not more than 1% less than a film with a comparable construction except for a smooth, non-structured second surface.

First claim

What is claimed is:

1 . An optical film comprising:
a first structured surface comprising a plurality of prismatic structures; and a second structured surface opposing the first structured surface and comprising a plurality of microstructures, wherein an effective transmission of the optical film is not more than 1% less than a film with a comparable construction except for a smooth, non-structured second surface.

2 . The optical film of claim 1 , wherein the effective transmission of the optical film is more than the film with the comparable construction except for the smooth, non-structured second surface.

3 . The optical film of claim 1 , wherein the second structured surface has an optical haze of less than about 10% and an optical clarity of less than about 50%.

4 . The optical film of claim 3 , wherein at least 85% of the second structured surface has a slope magnitude that is less than about 7.5 degrees.

5 . The optical film of claim 1 , wherein the microstructures on the second structured surface are distributed such that the film has an RR 1 value of less than 2.

6 . The optical film of claim 1 , wherein the second structured surface has an optical haze of less than about 7.5% and an optical clarity of less than about 60%.

7 . The optical film of claim 6 , wherein at least 90% of the second structured surface has a slope magnitude that is less than about 7.5 degrees.

8 . The optical film of claim 7 , wherein the optical film comprises a plurality of particles having an average size that is less than about 0.5 microns.

9 . The optical film of claim 1 , wherein the second structured surface has an optical haze of less than about 3% and an optical clarity of less than about 65%.

10 . The optical film of claim 9 , wherein at least 90% of the second structured surface has a slope magnitude that is less than about 5 degrees.

11 . The optical film of claim 1 having an optical gain of at least about 1.5.

12 . The optical film of claim 1 , wherein the second structured surface has an optical haze of less than about 1.5% and an optical clarity of less than about 80%.

13 . The film of claim 1 , wherein the second structured surface has an optical haze of less than about 1% and an optical clarity of less than about 90%.

14 . The optical film of claim 1 , wherein the first and second structured surfaces are comprised of different materials.

15 . An optical film stack comprising:
a first optical film; and a second optical film disposed on and optically coupled to the first optical film; wherein the second optical film comprises a structured surface; and further wherein an effective transmission of the optical film stack is not more than 1% less than a comparative film stack with a comparable construction except for a second optical film with a smooth rather than structured surface.

16 . The optical film stack of claim 15 , wherein the effective transmission of the optical film stack is more than the comparative film stack.

17 . The optical film stack of claim 15 , wherein the first optical film comprises a brightness enhancing film.

18 . The optical film stack of claim 15 , wherein the first optical film comprises a polarizer.

19 . The optical film stack of claim 15 , further comprising a third optical film disposed between the first optical film and the second optical film.

20 . The optical film stack of claim 15 having an optical gain of at least about 1.5.

Assignees

• 3M Innovative Properties Co

Inventors

• Yapel Robert A
• Aronson Joseph T
• Atkinson Matthew R C
• Boyd Gary T
• Jendoubi Slah
• Johnson Mitchell A F
• Kaytor Scott R
• Kong Steven H
• Lu Fei
• Pham Tri D
• Secor Robert B
• Solomonson Steven D

Classifications

• G02B1/10 Primary

  Optical coatings produced by application to, or surface treatment of, optical elements (G02B1/08 takes precedence) · CPC title

• G02B5/0268

  characterized by the fabrication or manufacturing method · CPC title

• G02B5/0242

  by means of dispersed particles · CPC title

• G02B5/0221 Primary

  the surface having an irregular structure (G02B5/0226 takes precedence) · CPC title

• G02B5/0278

  used in transmission · CPC title