Antireflective polarizing plate and image display apparatus including same

Patent metadata

Field	Value
Publication number	US-2016154157-A1
Application number	US-201414905030-A
Country	US
Kind code	A1
Filing date	May 28, 2014
Priority date	Jul 23, 2013
Publication date	Jun 2, 2016
Grant date	—

Abstract

Disclosed are a polarizing plate, which includes a polarizer, and a quarter wave film (QWF) layer and a +C (positive C) plate layer, which are disposed on a lower side of the polarizer, wherein a total refractive index ratio Nz of the polarizer, the quarter wave film layer, and the +C plate layer is 0.1 to 0.8, and thereby shows excellent antireflection effects in an oblique direction of a screen as well as in a front direction thereof, and an image display apparatus including the same.

First claim

1 . A polarizing plate comprising:
a polarizer; and a quarter wave film (QWF) layer and a +C (positive C) plate layer, which are disposed on a lower side of the polarizer, wherein a total refractive index ratio Nz of the polarizer, the quarter wave film layer, and the +C plate layer is 0.1 to 0.8.

2 . The polarizing plate according to claim 1 , wherein the quarter wave film layer has reverse wavelength dispersion characteristics, and the total refractive index ratio is 0.1 to 0.8.

3 . The polarizing plate according to claim 1 , wherein the quarter wave film layer has the reverse wavelength dispersion characteristics, and the total refractive index ratio is 0.5 to 0.7.

4 . The polarizing plate according to claim 1 , wherein the quarter wave film layer has flat wavelength dispersion characteristics, and the total refractive index ratio is 0.1 to 0.8.

5 . The polarizing plate according to claim 1 , wherein the quarter wave film layer has the flat wavelength dispersion characteristics, and the total refractive index ratio is 0.3 to 0.6.

6 . The polarizing plate according to claim 1 , wherein the quarter wave film layer has normal wavelength dispersion characteristics, and the total refractive index ratio is 0.4 to 0.8.

7 . The polarizing plate according to claim 1 , wherein the quarter wave film layer has the normal wavelength dispersion characteristics, and the total refractive index ratio is 0.5 to 0.7.

8 . The polarizing plate according to claim 1 , wherein the +C plate layer has a refractive index ratio Nz of −6 or less.

9 . The polarizing plate according to claim 1 , wherein the +C plate layer has a retardation value Rth in a thickness direction of −190 to −10 nm.

10 . The polarizing plate according to claim 1 , wherein the quarter wave film layer has the retardation value Rth in the thickness direction of 40 to 180 nm.

11 . The polarizing plate according to claim 1 , wherein the quarter wave film layer has a front retardation value Ro of 110 to 180 nm.

12 . The polarizing plate according to claim 1 , further comprising a protective film which is disposed on at least one surface of the polarizer.

13 . The polarizing plate according to claim 1 , further comprising a zero retardation film which is disposed on one surface of the +C plate layer.

14 . An image display apparatus comprising the polarizing plate according to claim 1 .

15 . The image display apparatus according to claim 14 , including an organic light emitting diode (OLED) or liquid crystal display (LCD) apparatus body of the syringe by inserting the needle into the ball through the cutout insertion portion at one side in communication with the outside and rotating the ball.

Assignees

• Dongwoo Fine Chem Co Ltd

Inventors

• Cho Jung Min
• Seo Yong Won
• Choi Byoung Chul

Classifications

• G02B5/3041 Primary

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

• H10K59/8791

  Arrangements for improving contrast, e.g. preventing reflection of ambient light · CPC title

• G02B1/11 Primary

  Anti-reflection coatings · CPC title

• G02B27/281

  used for attenuating light intensity, e.g. comprising rotatable polarising elements · CPC title

• G02B1/14

  Protective coatings, e.g. hard coatings · CPC title