Reflective polarizing film, and light source assembly and liquid display device each comprising same

Patent metadata

Field	Value
Publication number	US-2025020957-A1
Application number	US-202218699009-A
Country	US
Kind code	A1
Filing date	Sep 22, 2022
Priority date	Oct 5, 2021
Publication date	Jan 16, 2025
Grant date	—

Abstract

The present invention relates to a reflective polarizing film, and more specifically to a reflective polarizing film with improved luminance and polarization, and a light source assembly and a liquid crystal display device each including the same.

First claim

1 . A reflective polarizing film, comprising:
a matrix; and a core layer including a plurality of polymer dispersions that are randomly arranged in the matrix in the y-axis and z-axis directions while the x-axis direction is the longitudinal direction among the x-axis, y-axis, and z-axis that are perpendicular to one another, wherein when a plane of the core layer taken along a y-z plane is demarcated into 5 regions with the same thickness in the z-axis direction, the difference between a polymer dispersion area percentage in the uppermost or the lowermost region and a polymer dispersion area percentage in the center region among the 5 regions is 10% or less

2 . The reflective polarizing film of claim 1 , wherein the matrix and the polymer dispersion have a difference in refractive index in the y-axis and z-axis directions of 0.05 or less, and a difference in refractive index in the x-axis direction of 0.1 or more.

3 . The reflective polarizing film of claim 1 , wherein the plurality of polymer dispersions have an average thickness of 50 nm or more on a plane of the core layer taken along the y-z plane.

4 . The reflective polarizing film of claim 1 , wherein the polymer dispersion located in the center region has an average thickness of 110 nm or less.

5 . The reflective polarizing film of claim 1 , wherein the average thickness ratio (d II /d I ) between the average thickness (dr) of the polymer dispersion included in the uppermost region or the lowermost region and the average thickness (d II ) of the polymer dispersion included in the center region is 0.8 to 1.6.

6 . The reflective polarizing film of claim 1 , wherein the percentage of the polymer dispersion area in the total area of the matrix and polymer dispersion in the uppermost region or the lowermost region and the percentage of the polymer dispersion area in the total area of the matrix and polymer dispersion in the center region are each independently 40 to 55%.

7 . The reflective polarizing film of claim 1 , wherein the reflective polarizing film has a haze of 30% or less, and the core layer has a thickness of 150 μm or less.

8 . The reflective polarizing film of claim 1 , further comprising:
a skin layer which is formed integrally with at least one surface of the core layer.

9 . A light source assembly, comprising the reflective polarizing film according to claim 1 .

10 . A liquid display device, comprising:
a light source unit which is the light source assembly according to claim 9 ; and a display unit including a liquid crystal cell which is disposed on a light-emitting surface of the light source unit.

Assignees

• Toray Advanced Mat Korea Inc

Inventors

• Bae Joong Suk

Classifications

• G02F1/133536

  Reflective polarizers (G02F1/13362 takes precedence) · CPC title

• G02F1/133528

  Polarisers · CPC title

• G02F1/1335

  Structural association of cells with optical devices, e.g. polarisers or reflectors · CPC title

• G02F1/13362 Primary

  providing polarized light, e.g. by converting a polarisation component into another one · CPC title

• G02B1/04

  made of organic materials, e.g. plastics (G02B1/08 takes precedence) · CPC title