Optical layered body

Patent metadata

Field	Value
Publication number	US-2020292877-A1
Application number	US-201816767825-A
Country	US
Kind code	A1
Filing date	Nov 29, 2018
Priority date	Nov 29, 2017
Publication date	Sep 17, 2020
Grant date	—

Abstract

Provided is an optical laminate having the following feature: when the optical laminate is used in an image display apparatus, the optical laminate can express a sufficient brightness, can express a satisfactory hue, and can achieve a cost reduction while suppressing a reflectance. The optical laminate of the present invention includes: a wavelength conversion layer; and an absorption layer arranged on one side of the wavelength conversion layer, wherein the absorption layer has an absorption peak in a wavelength band in a range of from 580 nm to 610 nm, and wherein the absorption layer contains a compound x represented by the general formula (I) or the general formula (II).

First claim

1 . A optical laminate, comprising:
a wavelength conversion layer; and an absorption layer arranged on one side of the wavelength conversion layer, wherein the absorption layer has an absorption peak in a wavelength band in a range of from 580 nm to 610 nm, and wherein the absorption layer contains a compound X represented by the following general formula (I) or general formula (II):

in the formula (I),
R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , and R 8 each independently represent a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group having 1 or more and 20 or less carbon atoms, a substituent represented by the formula (a), or a substituent represented by the formula (b),
R 1 and R 2 form a saturated cyclic skeleton including 5 or 6 carbon atoms, and R 3 , R 4 , R 5 , R 6 , R 7 , and R 8 each independently represent a hydrogen atom, a halogen atom, which is preferably Cl, a substituted or unsubstituted alkyl group having 1 or more and 20 or less carbon atoms, a substituent represented by the formula (a), or a substituent represented by the formula (b),
R 2 and R 3 form a saturated cyclic skeleton including 5 to 7 carbon atoms, and R 1 , R 4 , R 5 , R 6 , R 7 , and R 8 each independently represent a hydrogen atom, a halogen atom, which is preferably Cl, a substituted or unsubstituted alkyl group having 1 or more and 20 or less carbon atoms, a substituent represented by the formula (a), or a substituent represented by the formula (b),
R 5 and R 6 form a saturated cyclic skeleton including 5 or 6 carbon atoms, and R 1 , R 2 , R 3 , R 4 , R 7 , and R 8 each independently represent a hydrogen atom, a halogen atom, which is preferably Cl, a substituted or unsubstituted alkyl group having 1 or more and 20 or less carbon atoms, a substituent represented by the formula (a), or a substituent represented by the formula (b),
R 6 and R 7 form a saturated cyclic skeleton including 5 to 7 carbon atoms, and R 1 , R 2 , R 3 , R 4 , R 5 , and R 8 each independently represent a hydrogen atom, a halogen atom, which is preferably Cl, a substituted or unsubstituted alkyl group having 1 or more and 20 or less carbon atoms, a substituent represented by the formula (a), or a substituent represented by the formula (b),
R 1 and R 2 form a saturated cyclic skeleton including 5 or 6 carbon atoms, R 5 and R 6 form a saturated cyclic skeleton including 5 or 6 carbon atoms, and R 3 , R 4 , R 7 , and R 8 each independently represent a hydrogen atom, a halogen atom, which is preferably Cl, a substituted or unsubstituted alkyl group having 1 or more and 20 or less carbon atoms, a substituent represented by the formula (a), or a substituent represented by the formula (b), or
R 2 and R 3 form a saturated cyclic skeleton including 5 to 7 carbon atoms, R 6 and R 7 form a saturated cyclic skeleton including 5 to 7 carbon atoms, and R 1 , R 4 , R 5 , and R 8 each independently represent a hydrogen atom, a halogen atom, which is preferably Cl, a substituted or unsubstituted alkyl group having 1 or more and 20 or less carbon atoms, a substituent represented by the formula (a), or a substituent represented by the formula (b); and
in the formula (II), R 4 and R 8 each independently represent a hydrogen atom, or a substituted or unsubstituted alkyl group having 1 or more and 20 or less carbon atoms.

2 . The optical laminate according to claim 1 , wherein the optical laminate is free of a polarizing plate on a side of the absorption layer opposite to the wavelength conversion layer.

3 . The optical laminate according to claim 1 , wherein the wavelength conversion layer contains quantum dots or a phosphor as a wavelength conversion material.

4 . The optical laminate according to claim 1 , wherein the wavelength conversion layer is a color filter.

5 . An image display apparatus, comprising the optical laminate of claim 1 .

6 . The image display apparatus according to claim 5 , wherein the image display apparatus comprises a liquid crystal panel including the optical laminate of claim 1 , and a backlight.

7 . The image display apparatus according to claim 6 , wherein the liquid crystal panel includes the absorption layer, the wavelength conversion layer, a viewer-side polarizing plate, a liquid crystal cell, and a backlight-side polarizing plate in the stated order from a viewer side.

Assignees

• Nitto Denko Corp

Inventors

• Nakamura Kozo
• Wang Peng
• Welch Michael
• Zheng Shijun

Classifications

• H10K77/00

  Constructional details of devices covered by this subclass and not covered by groups H10K10/80, H10K30/80, H10K50/80 or H10K59/80 · CPC title

• G02F1/133528 Primary

  Polarisers · CPC title

• C09B57/007 Primary

  Squaraine dyes · CPC title

• H10H20/851

  Wavelength conversion means · CPC title

• G02F1/133302

  Rigid substrates, e.g. inorganic substrates · CPC title