Polarized ultraviolet light splitting element

• US 9,442,303 B2
• Filed: 08/29/2013
• Issued: 09/13/2016
• Est. Priority Date: 08/29/2012
• Status: Active Grant

• Current Assignee: LG Chem Limited (LG Corporation)
• Original Assignee: LG Chem Limited (LG Corporation)
• Inventors: Kim, Tae Su, Kim, Jae Jin, Lee, Jong Byung, Park, Jeong Ho, Jung, Jin Mi, Shin, Bu Gon
• Primary Examiner(s): FONT, FRANK G
• Application Number:
  US14/424,915
• Publication Number:
  US 20150219918A1
• Time in Patent Office: 1,111 Days
• US Class Current: 1/1
• CPC Class Codes: G02B 27/283 used for beam splitting or combining
• CPC Class Codes: G02B 5/20 Filters polarising elements G02B5/30
• CPC Class Codes: G02B 5/30 Polarising elements light-modulating devices with active elements G02F1/00
• CPC Class Codes: G02B 5/3058 comprising electrically conductive elements, e.g. wire grids, conductive particles
• CPC Class Codes: G02B 5/3075 for use in the UV G02B5/3066 takes precedence
• CPC Class Codes: G02F 1/133788 by light irradiation, e.g. linearly polarised light photo-polymerisation
• CPC Class Codes: G21K 1/16 using polarising devices, e.g. for obtaining a polarised beam ion sources, ion guns H01J27/02; polarised targets for producing nuclear reactions H05H6/005
• CPC Class Codes: G21K 5/04 with beam-forming means

Abstract

The present application relates to a polarized ultraviolet light splitting element and to the use thereof. The present application may provide a polarized ultraviolet light splitting element which exhibits excellent splitting efficiency within a wide range of the ultraviolet light region and which has excellent durability. The element can be used, for example, in a photoalignment process of a liquid crystal alignment film.

Claims

1. A polarized ultraviolet light splitting element, comprising:

a substrate layer; and

at least two stripe-shaped convex portions formed on the substrate layer comprising a titanium metal composite oxide, and wherein the at least two stripe-shaped convex portions are geometrically parallel to each other,

wherein the titanium metal composite oxide is represented by the following Chemical Formula 1;

Ti_xM_yO₂ 

 

[Chemical Formula 1]

wherein M is Ni, Cr, Cu, Fe, B, V, Nb, Sb, Sn, Si, or Al, y is 0.01 to 0.2, and x+y is 1.

2. The polarized ultraviolet light splitting element of claim 1, wherein a polarization extinction ratio R calculated by the following Equation 1 is about 2 or more:

R=Tc/Tp, 

 

[Equation 1]

wherein Tc represents a transmission rate of light polarized in a perpendicular direction to the stripe-shaped convex portion and having a wavelength of about 250 to 350 nm with respect to the polarized ultraviolet light splitting element when light radiates through the polarized ultraviolet light splitting element, and Tp represents a transmission rate of light polarized in a parallel direction to the stripe-shaped convex portion and having a wavelength of about 250 to 350 nm with respect to the polarized ultraviolet light splitting element when light radiates through the polarized ultraviolet light splitting element.

3. The polarized ultraviolet light splitting element of claim 1, wherein a light transmission rate P calculated by the following Equation 2 is about 0.2 to 0.5:

P=Tc/T, 

 

[Equation 2]

wherein T represents an intensity of light radiated to the polarized ultraviolet light splitting element and having a wavelength of about 250 to 350 nm when light radiates through the polarized ultraviolet light splitting element, and Tc represents an intensity of light, which passes through the polarized ultraviolet light splitting element, among the radiated light, polarized in a perpendicular direction to the stripe-shaped convex portion, and having a wavelength of about 250 to 350 nm when light radiates through the polarized ultraviolet light splitting element.

4. The polarized ultraviolet light splitting element of claim 1, wherein the titanium metal composite oxide has a light transmission rate of less than 10% at a wavelength of 350 nm.

5. The polarized ultraviolet light splitting element of claim 1, wherein the titanium metal composite oxide is an oxide comprising titanium and at least one second metal selected from Ni, Cr, Cu, Fe, B, V, Nb, Sb, Sn, Si, and Al.

6. The polarized ultraviolet light splitting element of claim 5, wherein a ratio of the second metal in the titanium metal composite oxide is one to 20 mol %.

7. The polarized ultraviolet light splitting element of claim 1, wherein a pitch of the stripe-shaped convex portion formed in parallel is 50 nm to 200 nm.

8. The polarized ultraviolet light splitting element of claim 7, wherein a ratio W/P of a width W of the convex portion with respect to the pitch P of convex portion is 0.2 to 0.8.

9. The polarized ultraviolet light splitting element of claim 1, wherein a height of the convex portion is 20 to 300 nm.

10. A light illuminating apparatus, comprising:

a mounting device; and

the polarized ultraviolet light splitting element of claim 1, which are sequentially arranged.

11. The light irradiation apparatus of claim 10, further comprising an alignment mask located between the mounting device and the polarized ultraviolet light splitting element.

12. An arrangement comprising:

an ultraviolet light source; and

the light irradiation apparatus of claim 10;

wherein the light source irradiates the polarized ultraviolet light splitting element with ultraviolet light.

13. A method of irradiating a subject with light, comprising:

mounting a subject on the mounting device of the light illuminating apparatus of claim 10; and

irradiating the subject by the medium of the polarized ultraviolet light splitting element.

14. A method of preparing an aligned photo alignment layer, comprising:

mounting a photo alignment layer on the mounting device of the light illuminating apparatus of claim 10; and

irradiating the photo alignment layer with a linearly polarized light by the medium of the polarized ultraviolet light splitting element.