Multilayered optical film and display device including optical film

• US 9,986,603 B2
• Filed: 05/02/2017
• Issued: 05/29/2018
• Est. Priority Date: 12/27/2012
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Cheil Industries Incorporated, Samsung Electronics Co. Ltd.
• Inventors: Kim, Hee-Kyung, Lee, Moon Yeon, Oh, Kyoung Ah, In, Kyu Yeol, Lee, Ji-Hoon, Jung, Myung Sup, Gam, Sang ah
• Primary Examiner(s): Raleigh, Donald
• Application Number:
  US15/584,894
• Publication Number:
  US 20170303349A1
• Time in Patent Office: 392 Days
• CPC Class Codes: G02B 5/3016 involving passive liquid crystal elements optical properties of liquid crystals G02F1/0063; polarising elements associated with active liquid crystal devices G02F1/133528
• CPC Class Codes: H05B 33/02 Details
• CPC Class Codes: H10K 50/86 Arrangements for improving contrast, e.g. preventing reflection of ambient light
• CPC Class Codes: H10K 59/8791 Arrangements for improving contrast, e.g. preventing reflection of ambient light

Abstract

An optical film includes: a liquid crystal coating; and a base layer on the liquid crystal coating, wherein the liquid crystal coating has reversed wavelength dispersion and in-plane retardation for a reference wavelength ranging from 126 nm to 153 nm, and the base layer has in-plane retardation ranging from about 0 to about 50 nm and out-of-plane retardation ranging from about 0 nm to about 100 nm.

Claims

1. An optical film comprising:

a liquid crystal layer having reversed wavelength dispersion, the liquid crystal layer being a quarter-wave retarder; and

a base layer on the liquid crystal layer,

wherein the base layer comprises a negative c-plate.

2. The optical film of claim 1, wherein the base layer has in-plane retardation ranging from about 0 to about 50 nm.

3. The optical film of claim 1, wherein the base layer has in-plane retardation equal to or greater than about 30 nm.

4. The optical film of claim 1, further comprising a polarization layer on the base layer.

5. The optical film of claim 1, further comprising an alignment layer disposed between the base layer and the liquid crystal layer.

6. The optical film of claim 5, wherein the alignment layer has unevenness aligned in a direction.

7. An optical film comprising:

a liquid crystal layer having reversed wavelength dispersion, the liquid crystal layer being a quarter-wave retarder; and

a base layer on the liquid crystal layer,

wherein the base layer has optical biaxiality.

8. The optical film of claim 7, wherein the base layer has in-plane retardation ranging from about 0 to about 50 nm.

9. The optical film of claim 7, wherein the base layer has in-plane retardation equal to or greater than about 30 nm.

10. The optical film of claim 7, further comprising a polarization layer on the base layer.

11. The optical film of claim 7, further comprising an alignment layer disposed between the base layer and the liquid crystal layer.

12. The optical film of claim 11, wherein the alignment layer has unevenness aligned in a direction.