Multilayered optical film and display device including optical film

• US 9,661,692 B2
• Filed: 12/26/2013
• Issued: 05/23/2017
• Est. Priority Date: 12/27/2012
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd., Cheil Industries Incorporated (Samsung Group)
• Original Assignee: Samsung Electronics Co. Ltd., Cheil Industries Incorporated (Samsung Group)
• Inventors: Kim, Hee-Kyung, Lee, Moon Yeon, Oh, Kyoung Ah, In, Kyu Yeol, Gam, Sang ah, Lee, Ji-Hoon, Jung, Myung Sup
• Primary Examiner(s): Raleigh, Donald
• Application Number:
  US14/141,192
• Publication Number:
  US 20140184052A1
• Time in Patent Office: 1,244 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 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 equal to or greater than 10 and equal to or less than 50 nm and out-of-plane retardation ranging from about 0 nm to about 100 nm.

2. The optical film of claim 1, wherein the in-plane retardation of the liquid crystal coating ranges from about 130 nm to about 142 nm.

3. The optical film of claim 1, wherein short-wavelength dispersion (=retardation for incident light with a wavelength of about 450 nm/ retardation for incident light with a wavelength of about 550 nm) of the liquid crystal coating is smaller than about one, and long-wavelength dispersion (=retardation for incident light with a wavelength of about 650 nm/retardation for incident light with a wavelength of about 550 nm) of the liquid crystal coating is greater than about one.

4. The optical film of claim 3, wherein the in-plane retardation of the base layer ranges from about 10 nm to about 50 nm, and the out-of-plane retardation of the base layer ranges from about 0 nm to about 70 nm.

5. The optical film of claim 4, wherein the in-plane retardation of the base layer is equal to about 10 nm, and the out-of-plane retardation of the base layer ranges from about 0 nm to about 60 nm.

6. The optical film of claim 1, further comprising:

an alignment layer disposed between the base layer and the liquid crystal coating.

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

8. The optical film of claim 7, wherein the unevenness of the alignment layer is formed by nano imprint.

9. The optical film of claim 7, wherein the alignment layer includes a photosensitive resin.

10. The optical film of claim 1, wherein the liquid crystal coating comprises a quarter-wave plate.

11. The optical film of claim 10, further comprising a polarization layer on the liquid crystal coating.

12. An organic light emitting display comprising:

an organic light emitting panel; and

an optical film on the organic light emitting panel,

wherein the optical film comprises a liquid crystal coating and a base layer on the liquid crystal coating,

the liquid crystal coating has reversed wavelength dispersion and in-plane retardation of the liquid crystal coating for a reference wavelength ranging from 126 nm to 153 nm, and

the base layer has in-plane retardation equal to or greater than 10 and equal to or less than 50 nm and out-of-plane retardation ranging from about 0 nm to about 100 nm.

13. The organic light emitting display of claim 12, wherein the in-plane retardation of the liquid crystal coating ranges from about 130 nm to about 142 nm.

14. The organic light emitting display of claim 12, wherein short-wavelength dispersion (=retardation for incident light with a wavelength of about 450 nm/retardation for incident light with a wavelength of about 550 nm) of the liquid crystal coating is smaller than about one, and long-wavelength dispersion (=retardation for incident light with a wavelength of about 650 nm/retardation for incident light with a wavelength of about 550 nm) of the liquid crystal coating is greater than about one.

15. The organic light emitting display of claim 14, wherein the in-plane retardation of the base layer ranges from about 10 nm to about 50 nm, and the out-of-plane retardation of the base layer ranges from about 0 nm to about 70 nm.

16. The organic light emitting display of claim 15, wherein the in-plane retardation of the base layer is equal to about 10 nm, and the out-of-plane retardation of the base layer ranges from about 0 nm to about 60 nm.

17. The organic light emitting display of claim 15, wherein the optical film further comprises:

an alignment layer disposed between the base layer and the liquid crystal coating.

18. The organic light emitting display of claim 17, wherein the alignment layer has unevenness aligned in a direction.