Optical sheet and optical component

Patent metadata

Field	Value
Publication number	US-2023011467-A1
Application number	US-202017772713-A
Country	US
Kind code	A1
Filing date	Oct 26, 2020
Priority date	Oct 29, 2019
Publication date	Jan 12, 2023
Grant date	—

Abstract

An optical sheet 10 of the present invention includes a laminate including a polarizing layer 4 containing at least one kind of a light absorbing agent and having a polarizing function, and a protective layer 1 laminated on the polarizing layer 4, in which in the polarizing layer 4, a value of a* is 0 or more and 30 or less and a value of b* is 0 or more and 30 or less in an L*a*b* color system defined by JIS Z 8781-4, and in the optical sheet 10, a size of a Q Blue value defined by Australian Standard Australia/New Zealand Standard 1067-2016 is 0.70 or more. Thus, even when the optical sheet is toned to brown, blue light can be distinguished with excellent distinguishability.

First claim

1 . An optical sheet comprising:
a laminate including a polarizing layer containing at least one kind of a light absorbing agent and having a polarizing function, and a protective layer laminated on the polarizing layer, wherein in the polarizing layer, a value of a* is 0 or more and 30 or less and a value of b* is 0 or more and 30 or less in an L*a*b* color system defined by JIS Z 87814, and wherein in the optical sheet, a size of a Q Blue value defined by Australian Standard Australia/New Zealand Standard 1067-2016 is 0.70 or more.

2 . The optical sheet according to claim 1 ,
wherein the polarizing layer has a first peak having a peak wavelength of light transmittance in a wavelength range of 460 nm or more and 510 nm or less in a light absorption spectrum, and wherein the light transmittance at the peak wavelength of the first peak is 5% or more and 40% or less.

3 . The optical sheet according to claim 2 ,
wherein a half-width of the transmittance at the first peak is 20 nm or more and 60 nm or less.

4 . The optical sheet according to claim 1 ,
wherein the light absorbing agent includes a first light absorbing agent having a peak light absorbance in a wavelength range of 580 nm or more and 680 nm or less, a second light absorbing agent having a peak light absorbance in a wavelength range of 380 nm or more and 430 nm or less, and a third light absorbing agent having a peak light absorbance in a wavelength range of 430 mu or more and 580 nm or less, and wherein when a transparent film is dyed with the second light absorbing agent such that transmittance of a peak top is 30% and transmittance from 680 nm to 780 nm is 900% or more, the second light absorbing agent has a light absorption spectrum in which an average light transmittance obtained as an average value of transmittance measured in a wavelength range of 480 nm or more and 530 nm or less is 67% or more and 99% or less.

5 . The optical sheet according to claim 4 ,
wherein each of the first light absorbing agent, the second light absorbing agent, and the third light absorbing agent is an azo-based dye.

6 . The optical sheet according to claim 4 ,
wherein the second light absorbing agent is at least one of yellow dyes represented by General Formula (1) and General Formula (2),

where R 1 's each independently represent a hydrogen atom, a methyl group, or a sodium sulfonate group, and

where R 2 's each independently represent a hydrogen atom, a methyl group, or a sodium sulfonate group.

7 . An optical component comprising:
a substrate; and the optical sheet according to claim 1 which is laminated on the substrate.

Assignees

• Sumitomo Bakelite Co

Inventors

• Nishino Satoshi
• Oya Hiroshi

Classifications

• G02C7/12

  Polarisers · CPC title

• C09B33/02

  Disazo dyes · CPC title

• G02B5/223

  containing organic substances, e.g. dyes, inks or pigments · CPC title

• C09B35/023

  in which the coupling component is a hydroxy or polyhydroxy compound · CPC title

• G02B1/04 Primary

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