Random dispersion-type reflection polarizer

• US 9,952,363 B2
• Filed: 12/30/2014
• Issued: 04/24/2018
• Est. Priority Date: 12/31/2013
• Status: Active Grant

• Current Assignee: Toray Advanced Materials Korea Incorporated (Toray Industries Incorporated)
• Original Assignee: Toray Korea Chemical, Inc.
• Inventors: Ko, Sueng Jin, Cho, Duk Jae, Lee, Hwang Kyu
• Primary Examiner(s): FONT, FRANK G
• Application Number:
  US15/107,752
• Publication Number:
  US 20160320537A1
• Time in Patent Office: 1,211 Days
• Field of Search: 35948601, 35948901, 35948906, 349 96, 349117, 349118
• CPC Class Codes: B29D 11/00278 Lenticular sheets B29D11/00269 takes precedence
• CPC Class Codes: B29D 11/00644 polarizing
• CPC Class Codes: G02B 27/283 used for beam splitting or combining
• CPC Class Codes: G02B 5/0215 the surface having a regular structure
• CPC Class Codes: G02B 5/0221 the surface having an irregular structure G02B5/0226 takes precedence
• CPC Class Codes: G02B 5/0231 the surface having microprismatic or micropyramidal shape macroscopic prism arrays G02B5/045
• CPC Class Codes: G02B 5/0294 adapted to provide an additional optical effect, e.g. anti-reflection or filter
• CPC Class Codes: G02B 5/3008 comprising dielectric particles, e.g. birefringent crystals embedded in a matrix
• CPC Class Codes: G02B 5/3083 Birefringent or phase retarding elements G02B5/3008, G02B5/3016 take precedence; systems for polarisation control G02B27/286; manufacturing phase modulating patterns by lithographic processes G03F7/001
• CPC Class Codes: G02F 1/133528 Polarisers
• CPC Class Codes: G02F 1/133536 Reflective polarizers G02F1/13362 takes precedence

Abstract

A reflection-type polarizer according to the present invention has an improved bright line visibility phenomenon and a wider viewing angle, compared with a conventional dispersion-type reflection polarizer, and can maximize luminance improvement while minimizing optical loss. In addition, in connection with implementing a reflection polarizer, a group dispersion body can be formed through simple control, making it possible to maximize productivity improvement through process simplification.

Claims

1. A random dispersion-type reflective polarizer, comprising:

a core layer, which, to transmit first polarized light and reflect second polarized light of light incident upon the core layer, includes a plurality of dispersed bodies in a base, the plurality of dispersed bodies and the base having a different refractive index along at least one axis direction, and the plurality of dispersed bodies having a major axis and a minor axis based on a vertical cross-section taken of the plurality of dispersed bodies, 80% or more of the plurality of dispersed bodies having an aspect ratio, indicating a ratio of a length of the minor axis to a length of the major axis, based on a vertical cross-section in the lengthwise direction of 1/2 or less, where the dispersed bodies having an aspect ratio of 1/2 or less are divided into three or more groups having different cross-sectional areas, the cross-sectional area of the first group is 0.2 to 2.0 μ

m², the cross-sectional area of the second group is more than 2.0 to 5.0 μ

m², and the cross-sectional area of the third group is more than 5.0 to 10.0 μ

m², and the first to third groups of dispersed bodies are randomly aligned.

2. The reflective polarizer of claim 1, wherein, among the dispersed bodies having an aspect ratio of 1/2 or less, the number of dispersed bodies of the third group is 10% or more.

3. The reflective polarizer of claim 1, wherein, among the dispersed bodies having an aspect ratio of 1/2 or less, the number of dispersed bodies of the first group is 30 to 50%, and the number of dispersed bodies of the third group is 10 to 30%.

4. The reflective polarizer of claim 1, wherein, among the dispersed bodies having an aspect ratio of 1/2 or less, the number of the dispersed bodies of the first group divided by the number of the dispersed bodies of the third group is 3 to 5.

5. The reflective polarizer of claim 1, wherein the base and the dispersed body have a difference in refractive index of 0.05 or less with respect to two axis directions of any three mutually perpendicular axis directions, and 0.1 or more with respect to the remaining axis direction.

6. The reflective polarizer of claim 1, wherein the reflective polarizer is elongated in at least one axis direction.

7. The reflective polarizer of claim 1, further comprising:

a skin layer formed on at least one surface of the core layer.

8. The reflective polarizer of claim 1, further comprising:

a structured surface layer formed on at least one surface of the core layer.

9. The reflective polarizer of claim 8, further comprising:

a primer layer for reinforcing an adhesive strength, which is formed between the core layer and the structured surface layer.

10. The reflective polarizer of claim 9, wherein the structured surface layer is a micropattern layer.

11. The reflective polarizer of claim 10, wherein the micropattern is one or more selected from the group consisting of a prism pattern, a lenticular pattern, a microlens pattern, a triangular pyramid pattern, and a pyramid pattern.

12. The reflective polarizer of claim 8, wherein the structured surface layer is a micropattern layer.