Optical film, polarization plate, and image display device

Patent metadata

Field	Value
Publication number	US-2019391308-A1
Application number	US-201816482116-A
Country	US
Kind code	A1
Filing date	Jan 30, 2018
Priority date	Jan 31, 2017
Publication date	Dec 26, 2019
Grant date	—

Abstract

Provided is an optical film 10 including a light-transmitting base material 11 and a light-transmitting functional layer 12 provided on one surface of the light-transmitting base material 11, wherein the optical film 10 has a spectral transmittance of less than 1% at a wavelength of 380 nm, a spectral transmittance of 10% or more and less than 60% at a wavelength of 410 nm, and a spectral transmittance of 70% or more at a wavelength of 440 nm, and wherein the light-transmitting functional layer 12 has a film thickness of 9 μm or less.

First claim

1 . An optical film comprising a light-transmitting base material and a light-transmitting functional layer provided on one surface of the light-transmitting base material, wherein the optical film has
a spectral transmittance of less than 1% at a wavelength of 380 nm, a spectral transmittance of 10% or more and less than 60% at a wavelength of 410 nm, and a spectral transmittance of 70% or more at a wavelength of 440 nm, and wherein the light-transmitting functional layer has a film thickness of 9 μm or less.

2 . The optical film according to claim 1 , wherein the optical film has a yellow index of 1 or more and 12 or less.

3 . The optical film according to claim 1 , wherein the optical film has a blue light shielding rate of 30% or more.

4 . The optical film according to claim 1 , wherein the slope of the transmittance spectrum obtained by applying the least square method to the transmittance in the wavelength range from 410 nm to 420 nm is 2 or more.

5 . The optical film according to claim 1 , wherein the light-transmitting functional layer comprises a spectral transmittance adjustment layer that contains a resin and a spectral transmittance modifier.

6 . A polarizing plate comprising
the optical film according to claim 1 , and a polarizer provided on one surface of the optical film.

7 . An image display device comprising
a display element, and the optical film according to claim 1 placed on the observer's side of the display element.

8 . The image display device according to claim 7 , wherein the display element is an organic light-emitting diode display element.

9 . An image display device comprising
a display element, and the polarizing plate according to claim 6 placed on the observer's side of the display element.

Assignees

• Dainippon Printing Co Ltd

Inventors

• Nomura Takahisa
• Hamada Takanori
• Nakashima Masataka
• Hata Kentaro
• Nakamura Hiroshi
• Nakagawa Hiroki

Classifications

• G02B5/22

  Absorbing filters {(G02B5/201 - G02B5/208 take precedence)} · CPC title

• G02B5/208 Primary

  for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation · CPC title

• H01L51/5284

  Electricity · mapped topic

• H10K59/8791

  Arrangements for improving contrast, e.g. preventing reflection of ambient light · CPC title

• G02B1/14 Primary

  Protective coatings, e.g. hard coatings · CPC title