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Light absorbing body-containing film and backlight unit

a technology of backlight unit and film, which is applied in the direction of static indicating device, lighting and heating apparatus, instruments, etc., can solve the problems of poor productivity, poor luminance, and dark peripheral edge portion, and suppress in-plane luminance and chromaticity unevenness, etc.

Inactive Publication Date: 2019-08-15
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is aimed at providing a film that contains quantum dots or similar materials that can suppress unevenness in brightness and color across the film. Additionally, the invention aims to address the issue of tint unevenness, specifically blue light leakage, in the initial stages and after aging. The invention provides a solution for improving the quality and consistency of lighting in backlight units.

Problems solved by technology

In such a very thin film, it is difficult to control the thickness of the surrounding light conversion layer along the four sides according to the blue color unevenness of the backlight, and the productivity is poor.
In particular, it is not able to be wound long in order to increase the thickness of the end portion, and roll-to-roll production could not be made, thus resulting in poor productivity.
Further, in the configuration in which the light absorbing body is disposed on the peripheral edge portion of the quantum clot sheet as in JP2016-194989A, there is a problem that the peripheral edge portion becomes dark in a case of being incorporated in the backlight.
In addition, since the quantum dots at the end portion are deteriorated by photo-irradiation for a long time, there is a problem that blue light leakage occurs from the periphery of the backlight with time and color unevenness occurs.
In addition, even in the configuration in which the concentration of the quantum dots in the outer peripheral side portion of the wavelength conversion member is increased as in WO2016 / 148053A, since the quantum dots at the end portion are deteriorated by photo-irradiation for a long time, there is a problem that blue light leakage occurs from the periphery of the backlight with time and color unevenness occurs.

Method used

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  • Light absorbing body-containing film and backlight unit
  • Light absorbing body-containing film and backlight unit
  • Light absorbing body-containing film and backlight unit

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0455]

[0456]As a light absorbing material-containing film of the first aspect, a light absorbing material-containing film having a light absorbing material-containing layer was prepared using a coating liquid containing quantum dots as light absorbing bodies,

[0457](Preparation of Barrier Film)

[0458]As a first substrate film and a second substrate film, a barrier film in which a barrier layer made of an inorganic layer was formed on a support film made of PET, and an organic layer coated with the following composition was formed on the barrier layer was prepared as follows.

[0459]Using a PET film (manufactured by Toyoho Co., Ltd., trade name “COSMOSHINE (registered trademark) A4300”, thickness: 23 μm) as a support, an organic layer and an inorganic layer were sequentially formed on one side of the support by the following procedure.

[0460]—Formation of Organic Layer—

[0461]Trimethylolpropane triacrylate (product name “TMPTA”, manufactured by Daicel-Allnex Ltd.) and a photopolymerization...

example 2

[0488]A resin layer was formed and a light absorbing material-containing film 2 was obtained in the same manner as in Example 1, except that the depth of all concave portions (light absorption regions) was 50 μm, and the concave portion was 500×500 μm (width of resin layer: 50 μm) in the region up to 1 cm inside including the ends of the four sides. That is, this example was configured such that a concave portion (light absorption region with width of 250 μm) in the central portion of 250×250 μm was surrounded by a concave portion (light absorption region with width of 500 μm) in the peripheral portion of 500×500 μm.

example 3

[0490]As the light absorbing material-containing film of the second aspect, a light absorbing material-containing film 4 was obtained in the same manner as in Example 1, except that a frame in place of the resin layer was formed in the following manner, and a light absorption region was formed in the frame.

[0491](Formation of Frame)

[0492]Individual components such as a curable compound, a polymerization initiator, a second light absorbing body, and scattering particles were mixed by a tank or the like to prepare a coating liquid as a coating liquid 3 for forming a frame.

[0493]—Composition of Coating Liquid 3 for Forming Frame—

[0494]A coating liquid for a frame having the following composition was prepared to obtain a coating liquid 3.

Tricyclodecane dimethanol diacrylate (A-DCP,75parts by massmanufactured by Shin-Nakamura Chemical Co.,Ltd.)YAG phosphor (ZYP 550G3 (YUJI LED10parts by mass(manufactured by Yuji International Co., Ltd.)))Synthetic plate-like alumina, average14parts by ma...

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Abstract

Provided are a backlight unit and a light absorbing material-containing film which contains quantum dots or the like and is capable of suppressing in-plane luminance unevenness and chromaticity unevenness; and a backlight unit. The light absorbing material-containing film includes a light absorbing material-containing layer with a resin layer in which one or more concave portions discretely disposed are formed and a plurality of light absorption regions containing light absorbing bodies and disposed in the concave portions formed in the resin layer; a first substrate film laminated on one main surface of the light absorbing material-containing layer; and a second substrate film laminated on the other main surface of the light absorbing material-containing layer, where the light absorption region contains at least one phosphor that serves as the light absorbing body, and a binder.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a Continuation of PCT International Application No. PCT / JP2017 / 039925 filed on Nov. 6, 2017, which claims priority under 35 U.S.C. § 119(a) to Japanese Patent Application No. 2016-217547, filed on Nov. 7, 2016, Japanese Patent Application No. 2016-232101, filed on Nov. 30, 2016 and Japanese Patent Application No. 2017-097156, filed on May 16, 2017. Each of the above applications is hereby expressly incorporated by reference, in its entirety, into the present application.BACKGROUND OF THE INVENTION1. Field of the Invention[0002]The present invention relates to a light absorbing material-containing film including a light absorbing body (phosphor) that emits fluorescence upon irradiation with excitation light and a backlight unit comprising the light absorbing material-containing film as a wavelength conversion member.2. Description of the Related Art[0003]Applications of a flat panel display such as a liquid crystal disp...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G09G3/32G02F1/1335G02B5/00G09G3/36G09G3/20
CPCG09G3/32G02F1/133603G02B5/003G09G3/3607G09G3/2003B82Y20/00F21S2/00F21V9/00F21V9/08G02F1/133611G02F1/133606G09G3/34G02B5/201G02B5/0242G02B5/0294G02B5/0278G02F1/133614G02B5/20
Inventor TOYAMA, HIROFUMIOBA, TATSUYAYONEMOTO, TAKASHI
Owner FUJIFILM CORP
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