Polarizing beam splitters providing high resolution images and systems utilizing such beam splitters

Patent metadata

Field	Value
Publication number	US-10712578-B2
Application number	US-202016776632-A
Country	US
Kind code	B2
Filing date	Jan 30, 2020
Priority date	Nov 28, 2011
Publication date	Jul 14, 2020
Grant date	Jul 14, 2020

Abstract

Polarizing beam splitters and systems incorporating such beam splitters are described. More specifically, polarizing beam splitters and systems with such beam splitters that incorporate multilayer optical films and reflect imaged light towards a viewer or viewing screen with high effective resolution are described.

First claim

The invention claimed is:

1. A method comprising:
bonding a multilayer reflective polarizer to a first cover via a first optical adhesive; and
treating the multilayer reflective polarizer while bonded to the first cover resulting in the multilayer reflective polarizer becoming configured to reflect an incident imaged light with the reflected image light having an effective pixel resolution of less than 12 microns.

2. The method of claim 1 , wherein treating the multilayer reflective polarizer comprises applying vacuum to the reflective polarizer while bonded to the first cover.

3. The method of claim 1 , wherein treating the multilayer reflective polarizer comprises applying heat and pressure to the reflective polarizer while bonded to the first cover.

4. The method of claim 1 , wherein the first cover comprises a prism.

5. The method of claim 1 , wherein the first optical adhesive comprises a pressure sensitive adhesive.

6. The method of claim 1 further comprising bonding the multilayer reflective polarizer to a second cover via a second optical adhesive after the treatment of the multilayer reflective polarizer.

7. The method of claim 1 , wherein the treatment of the multilayer reflective polarizer results in the reflected image light having an effective pixel resolution of less than 9 microns.

8. The method of claim 1 , wherein the treatment of the multilayer reflective polarizer results in the reflected image light having an effective pixel resolution of less than 6 microns.

9. The method of claim 1 , wherein the effective pixel resolution of the imaged light is less than 6 microns after reflection from the polarizing beam splitter.

10. The method of claim 1 , wherein the first cover comprises glass or plastic.

Assignees

• 3M Innovative Properties Co

Inventors

• Carls Joseph C
• Lee Seong Taek
• Teo Yeow Leng
• Chan Kin Sheng
• Cheng Xiaohui

Classifications

• G03B21/14

  Details · CPC title

• G02B27/286

  for controlling or changing the state of polarisation, e.g. transforming one polarisation state into another (G02B5/3083 takes precedence; light guide coupling means utilising polarising elements G02B6/34) · CPC title

• G02B30/25

  using polarisation techniques · CPC title

• G02B5/3041

  comprising multiple thin layers, e.g. multilayer stacks · CPC title

• G02B27/283 Primary

  used for beam splitting or combining · CPC title