Multilayer organic solid thin films having a biaxial refractive index

Patent metadata

Field	Value
Publication number	US-12442964-B2
Application number	US-202217582580-A
Country	US
Kind code	B2
Filing date	Jan 24, 2022
Priority date	Apr 26, 2021
Publication date	Oct 14, 2025
Grant date	Oct 14, 2025

Abstract

A multilayer organic thin film includes a plurality of biaxially-oriented layers, where each layer is characterized by mutually orthogonal refractive indices, n 1 ≠n 2 ≠n 3 . In example structures, the corresponding in-plane refractive indices of adjacent layers may be rotated with respect to each other by a predetermined angle. Such a multilayer may be incorporated into a circular reflective polarizer, for example, which may be used in display systems to provide high broadband efficiency and high off-axis contrast. In an example process, individual organic thin films may be molded, and then oriented and stacked to form a multilayer.

First claim

What is claimed is:

1. A multilayer organic thin film comprising a plurality of biaxially-oriented layers, wherein each biaxially-oriented layer is equal in chemical composition and characterized by mutually orthogonal refractive indices, n 1 ≠n 2 ≠n 3 .

2. The multilayer organic thin film of claim 1 , wherein each biaxially-oriented layer comprises an optically anisotropic organic material.

3. The multilayer organic thin film of claim 1 , wherein each biaxially-oriented layer comprises a single crystal or polycrystalline material.

4. The multilayer organic thin film of claim 1 , wherein each biaxially-oriented layer comprises an optically anisotropic glassy material, the glassy material comprising molecules aligned along predetermined directions.

5. The multilayer organic thin film of claim 1 , wherein each biaxially-oriented layer directly overlies an adjacent biaxially-oriented layer.

6. The multilayer organic thin film of claim 1 , wherein in-plane refractive indices (n 2 , n 3 ) of a chosen biaxially-oriented layer are rotated by an angle (θ) with respect to corresponding in-plane refractive indices (n 2 , n 3 ) of a biaxially-oriented layer located adjacent to the chosen biaxially-oriented layer.

7. The multilayer organic thin film of claim 1 , wherein in-plane refractive indices (n 2 , n 3 ) of each biaxially-oriented layer are characterized by (n 2 +n 3 )/2>1.5.

8. The multilayer organic thin film of claim 1 , wherein in-plane refractive indices (n 2 , n 3 ) of each biaxially-oriented layer are characterized by |n 2 −n 3 |>0.05.

9. The multilayer organic thin film of claim 1 , wherein an out-of-plane refractive index (n 1 ) for a chosen biaxially-oriented layer is related to in-plane refractive indices (n 2 , n 3 ) for the chosen biaxially-oriented layer according to n 2 <n 1 <n 3 .

10. A circular reflective polarizer comprising the multilayer organic thin film of claim 1 .

11. A multilayer organic thin film comprising a stack of biaxially-oriented organic solid crystal layers, wherein each biaxially-oriented layer is equal in chemical composition, characterized by mutually orthogonal refractive indices, n 1 ≠n 2 ≠n 3 , and respective in-plane refractive indices (n 2 , n 3 ) of adjacent biaxially-oriented layers within the stack are rotationally offset by an angle (θ).

Assignees

• Meta Platforms Tech Llc

Inventors

• Rao Tingling
• Huang Yuge
• Purvis Ii Lafe Joseph
• Childress Kimberly Kay
• Boromand Arman
• Malhotra Tanya
• Ouderkirk Andrew John
• Lu Lu
• Sung Poer

Classifications

• G02B2027/0178

  Eyeglass type (eyeglass details G02C) · CPC title

• G06F1/163

  Wearable computers, e.g. on a belt · CPC title

• C30B29/54 Primary

  Organic compounds · CPC title

• G02B27/0172

  characterised by optical features · CPC title

• B29D11/00644

  polarizing · CPC title