Phosphor protective film, wavelength conversion sheet with release film, wavelength conversion sheet, and production method for wavelength conversion sheet

Patent metadata

Field	Value
Publication number	US-12074261-B2
Application number	US-202117239198-A
Country	US
Kind code	B2
Filing date	Apr 23, 2021
Priority date	Oct 26, 2018
Publication date	Aug 27, 2024
Grant date	Aug 27, 2024

Abstract

A production method for a wavelength conversion sheet, including: a bonding step of bonding a multilayer film and a release film together to obtain a phosphor protective film, the multilayer film including a barrier film, the release film being releasable from the multilayer film; a phosphor layer formation step of forming a phosphor layer containing phosphors on a surface of the multilayer film of the phosphor protective film to obtain a wavelength conversion sheet with the release film; and a release step of releasing the release film from the wavelength conversion sheet with the release film.

First claim

What is claimed is:

1. A production method for a wavelength conversion sheet, comprising the steps of:
a bonding step of bonding a multilayer film and a release film together to obtain a phosphor protective film, the multilayer film including a barrier film, the release film being releasable from the multilayer film;
a phosphor layer formation step of forming a phosphor layer containing phosphors on a surface of the multilayer film of the phosphor protective film to obtain a wavelength conversion sheet with the release film; and
a release step of releasing the release film from the wavelength conversion sheet with the release film.

2. The production method of claim 1 , wherein in the bonding step, the multilayer film and the release film are bonded to each other in a state where wrinkles in the multilayer film have been smoothed out.

3. The production method of claim 1 , wherein, in the phosphor layer formation step, the phosphor layer is formed between two sheets of the phosphor protective film.

4. The production method of claim 1 , wherein
the multilayer film includes a support film between the barrier film and the release film, and
a total thickness of the support film and the release film represents 60% or more of a total thickness of the phosphor protective film.

5. The production method of claim 1 , wherein
the multilayer film does not include a support film between the barrier film and the release film, and
a thickness of the release film represents 50% or more of a total thickness of the phosphor protective film.

6. The production method of claim 1 , wherein the barrier film includes a barrier film substrate having a thickness of 9 to 25 μm.

7. The production method of claim 1 , wherein the barrier film includes a barrier film substrate and an inorganic thin film layer provided on the barrier film substrate.

8. The production method of claim 1 , wherein
the multilayer film is provided with a functional layer on a side facing the release film, and
the functional layer is a layer that exhibits at least one type of function selected from the group consisting of an interference fringe prevention function, an antireflection function, a light diffusion function, an antistatic function, and a scratch prevention function.

9. The production method of claim 1 , wherein a variation (3σ) in a total thickness of the multilayer film is 1.5 μm or more, and a kinetic friction coefficient of a surface of the functional layer is 0.4 or less.

10. The production method of claim 1 , wherein a variation (3σ) in a total thickness of the phosphor protective film is 1.0 μm or less.

11. The production method of claim 1 , wherein a peel strength according to JIS K6854-3 between the multilayer film and the release film is 0.05 to 1.0 N/25 mm.

12. A production method for a wavelength conversion sheet, comprising the steps of:
a bonding step of bonding a main body and a release film together to obtain a phosphor protective film, the main body including a support film, the release film being releasable from the main body;
a phosphor layer formation step of forming a phosphor layer containing phosphors on a surface of the main body of the phosphor protective film to obtain a wavelength conversion sheet with the release film; and
a release step of releasing the release film from the wavelength conversion sheet with the release film, wherein
a thickness of the release film represents 50% or more of a total thickness of the phosphor protective film.

13. The production method of claim 12 , wherein in the bonding step, the main body and the release film are bonded to each other in a state where wrinkles in the main body have been smoothed out.

14. The production method of claim 12 , wherein in the phosphor layer formation step, the phosphor layer is formed between two sheets of the phosphor protective film.

15. The production method of claim 12 , wherein the support film has a thickness of 12 to 50 μm.

16. The production method of claim 12 , wherein the release film has a thickness of 25 to 150 μm.

17. The production method of claim 12 , wherein
the main body is provided with a functional layer on a side facing the release film, and
the functional layer is a layer that exhibits at least one type of function selected from the group consisting of an interference fringe prevention function, an antireflection function, a light diffusion function, an antistatic function, and a scratch prevention function.

Assignees

• Toppan Printing Co Ltd

Inventors

• Ichiba Hiroki
• Maruyama Satoshi
• Kurokawa Masato
• Saito Yasuhiko

Classifications

• H10H20/8512 Primary

  Wavelength conversion materials · CPC title

• H10H20/0361

  of wavelength conversion means · CPC title

• H10H20/034

  of coatings · CPC title

• H10H20/84

  Coatings, e.g. passivation layers or antireflective coatings · CPC title

• H10H20/8515 Primary

  not being in contact with the bodies · CPC title