FPR having periodic micropattern

Patent metadata

Field	Value
Publication number	US-9915835-B2
Application number	US-201414575468-A
Country	US
Kind code	B2
Filing date	Dec 18, 2014
Priority date	Nov 29, 2012
Publication date	Mar 13, 2018
Grant date	Mar 13, 2018

Abstract

This application relates a liquid crystal alignment film, a manufacturing method of the liquid crystal alignment film, an optical filter, and a display device. According to one illustrative liquid crystal alignment film, for example, a stereoscopic image can be displayed in wide viewing angles without losses of the brightness.

First claim

What is claimed is:

1. A liquid crystal alignment film, comprising:
a first layer having a surface on which a groove having a width in the range of 100 μm to 300 μm and a depth in the range of 0.5 μm to 5 μm is formed, wherein the groove is filled with a light blocking material, a light reflecting material or a light scattering material; and
a liquid crystal alignment layer formed on a surface of the light blocking material, the light reflecting material or the light scattering material,
wherein the light blocking material, the light reflecting material or the light scattering material is not formed on the whole surface of the first layer.

2. The liquid crystal alignment film of claim 1 , wherein a plurality of the grooves are formed on the surface of the first layer, and
wherein the grooves have stripe shapes extending in the same direction respectively, and are separately arranged from each other.

3. The liquid crystal alignment film of claim 2 , wherein a pitch between the grooves being separately arranged is in a range of 50 μm to 1000 μm.

4. The liquid crystal alignment film of claim 1 , wherein the groove is filled with the light blocking material and the light blocking material is carbon black, graphite, iron oxide, an azo-based pigment, or a phthalocyanine-based pigment.

5. The liquid crystal alignment film of claim 1 , wherein the groove is filled with the light reflecting material and the light reflecting material is metallic ink, cholesteric liquid crystal, or a birefractive material.

6. The liquid crystal alignment film of claim 1 , wherein the groove is filled with the light scattering material and the light scattering material is silica particles or nanoparticles.

7. The liquid crystal alignment film of claim 1 , wherein the surface of the first layer has a maximum height roughness of 1 μm or less.

8. A manufacturing method of a liquid crystal alignment film, comprising:
forming a groove having a width in a range of 5 μm to 300 μm and a depth in a range of 0.5 μm to 5 μm on a surface of a first layer,
filling the groove with a light blocking material, a light reflecting material or a light scattering material, wherein the light blocking material, the light reflecting material or the light scattering material is not formed on the whole surface of the first layer, and
forming a liquid crystal alignment layer on a surface of the light blocking material, the light reflecting material or the light scattering material.

9. An optical filter, comprising:
a liquid crystal alignment film comprising a first layer having a surface on which a groove having a width in the range of 100 μm to 300 μm and a depth in the range of 0.5 μm to 5 μm is formed, wherein the groove is filled with a light blocking material, a light reflecting material or a light scattering material;
a liquid crystal alignment layer formed on a surface of the light blocking material, the light reflecting material or the light scattering material; and
a liquid crystal layer that is formed on the liquid crystal alignment layer and that includes a first region and a second region which are different from each other in the phase retardation property,
and
wherein the light blocking material, the light reflecting material or the light scattering material is not formed on the whole surface of the first layer.

10. The optical filter of claim 9 , wherein two or more grooves are formed on the surface of the first layer, and the two or more grooves have stripe shapes extending in the same direction respectively, and are separately arranged from each other.

11. The optical filter of claim 10 , wherein the first region and the second region have stripe shapes extending in the same direction respectively, and are alternately arranged adjacent to each other, and
the grooves are overlapped with the first region or the second region on the border between the first region and the second region when observed from a direction of a normal line of the surface of the liquid crystal alignment film.

12. The optical filter of claim 9 , further comprising a polarizing layer formed on the liquid crystal layer.

13. A display device comprising the optical filter of claim 9 .

14. The display device of claim 13 , further comprising:
a displaying part comprising a region for generating a signal for a right eye, configured to generate the signal for the right eye; a region for generating a signal for a left eye, configured to generate the signal for the left eye; and a light-penetration-controlling region that is adjacent to the regions for generating the signals for the right eye and the left eye,
wherein the optical filter is arranged on one side of the displaying part such that one of first and second regions is in a position into which a signal for the right eye can enter, the other one of the first and second regions in a position into which a signal for the left eye can enter,
and wherein the maximum value of the angle θ U satisfying the following Formula 2 and the maximum value of the angle θ L satisfying the following Formula 3 are not less than three degrees:
tan θ U =( H 1 2 y )/2 T   [Formula 2]

tan θ L =( H 1 +2 H 2 −2 y )/2 T   [Formula 3]

wherein H 1 is a width of the light-penetration-controlling region, H 2 is a width of groove formed in the optical filter, T represents a distance from the displaying part to the optical filter, and y represents a distance from the point, at which a hypothetical normal of a line bisecting the width of the penetration-controlling region with respect to the surface of the light-penetration-controlling region comes in contact with the groove of the optical filter, to the point on which the groove is present.

Assignees

• Lg Chemical Ltd

Inventors

• Jeon Byoung Kun
• Park Moon Soo
• Shin Bu Gon
• Kim Sin Young
• Lee Jong Byung
• Lee Da Mi
• Park Ji Hoon

Classifications

• G02F1/133504 Primary

  Diffusing, scattering, diffracting elements (associated to illuminating devices G02F1/133606) · CPC title

• Y10T428/24479

  including variation in thickness · CPC title

• Y10T428/2457

  Parallel ribs and/or grooves · CPC title

• G02F1/133788 Primary

  by light irradiation, e.g. linearly polarised light photo-polymerisation · CPC title

• G02B27/28

  for polarising (used in stereoscopes G02B30/25) · CPC title