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Optical laminate

A technology of optical laminates and absorbing layers, applied in optics, optical components, nonlinear optics, etc., can solve problems such as abnormal hue, high cost, and reduced brightness, and achieve sufficient brightness, suppress reflectivity, and achieve cost-effective effects

Active Publication Date: 2020-01-21
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, when polarizers are used, there are problems such as decreased brightness, abnormal hue, and high cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0147] (wavelength conversion layer)

[0148] A commercially available TV (manufactured by Samsung, trade name "UN65JS9000FXZA") was disassembled to obtain a quantum dot sheet which is a wavelength conversion material contained on the backlight side. This quantum dot sheet is used as the wavelength conversion layer (1).

[0149] (absorbent layer)

[0150] Contains 0.3 wt. Parts, 1 part by weight of isocyanate crosslinking agent (manufactured by Tosoh, trade name "Coronate L"), 0.3 parts by weight of pigment (manufactured by Yamada Chemical Industry Co., Ltd., trade name "FDG-007"), phenolic antioxidant ( BASF Japan company make, brand name "IRGANOX1010") 0.2 weight part, and the pigment-containing adhesive was manufactured. The pigment-containing adhesive obtained above was applied with an applicator to a thickness of 20 μm on a PET substrate (manufactured by Mitsubishi Plastics Corporation, trade name "MRF38CK") subjected to a treatment to make the adhesive easy to peel, a...

Embodiment 2

[0154] (absorbent layer)

[0155] 0.3 parts by weight of the pigment used (manufactured by Yamada Chemical Industry Co., Ltd., trade name "FDG-007") was changed to 0.3 parts by weight of pigment (manufactured by Yamada Chemical Industry Co., Ltd., trade name "FDG-004"). Otherwise, the absorbing layer (2) was formed on TAC in the same manner as in Example 1. In addition, the dye used (manufactured by Yamada Chemical Industry Co., Ltd., trade name "FDG-004") is a compound having an absorption peak at a wavelength of 600 nm.

[0156] (optical laminate)

[0157] The wavelength conversion layer (1) obtained in Example 1 and the above-mentioned absorption layer (2) were laminated to obtain an optical laminate (2) having a laminated structure of a wavelength conversion layer / absorption layer. The results are shown in Table 1.

Embodiment 3

[0159] (absorbent layer)

[0160] 0.3 parts by weight of the pigment used (manufactured by Yamada Chemical Industry Co., Ltd., trade name "FDG-007") was changed to 0.3 parts by weight of pigment (manufactured by Yamada Chemical Industry Co., Ltd., trade name "FS-1531"). Otherwise, the absorbing layer (3) was formed on TAC in the same manner as in Example 1. In addition, the dye used (manufactured by Yamada Chemical Industry Co., Ltd., trade name "FS-1531") is a compound having an absorption peak at a wavelength of 700 nm.

[0161] (optical laminate)

[0162] The wavelength conversion layer (1) obtained in Example 1 and the above-mentioned absorption layer (3) were laminated to obtain an optical laminate (3) having a laminated structure of a wavelength conversion layer / absorption layer. The results are shown in Table 1.

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Abstract

Provided is an optical laminate which is capable of exhibiting sufficient luminance and good hue, while suppressing the reflectance in cases where the optical laminate is used in an image display device, and which enables reduction in the cost. An optical laminate according to the present invention comprises a wavelength conversion layer and an absorption layer; this optical laminate does not havea polarizing plate on a surface of the wavelength conversion layer, said surface being on the reverse side of the absorption layer-side surface; the wavelength conversion layer emits light by converting some of the wavelengths of incident light; the absorption layer contains a compound that has an absorption peak within the wavelength range of from 480 nm to 780 nm; the relationship of the average reflectance R1 of the wavelength conversion layer for the wavelength range of from 380 nm to 480 nm and the average reflectance R2 of the wavelength conversion layer for the wavelength range of from490 nm to 600 nm satisfies R2 > R1; and if P1 is the maximum peak value of the reflectance of the absorption layer side of the optical laminate in the wavelength range of from 380 nm to 480 nm and P2is the maximum peak value of the reflectance of the absorption layer side of the optical laminate in the wavelength range of from 490 nm to 600 nm, P2 / P1 is from 0.7 to 1.5.

Description

technical field [0001] The present invention relates to optical laminates Background technique [0002] In recent years, an image display device including a light-emitting layer made of a light-emitting material such as quantum dots has attracted attention as an image display device excellent in color reproducibility (for example, Patent Document 1). For example, when light is incident on a quantum dot film using quantum dots, the quantum dots are excited to emit fluorescence. For example, when a blue LED backlight is used, part of the blue light passes through the quantum dot film and is converted into red light and green light, while part of the blue light is directly emitted in the form of blue light. As a result, white light can be realized. And it is generally believed that the use of such a quantum dot film can achieve a color reproducibility of NTSC ratio of 100% or more. [0003] The image display device as described above has a high reflectance. Therefore, in or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/20G02B5/22G02F1/1335G02F1/13357
CPCG02B5/20G02B5/22G02F1/1335B32B7/023
Inventor 中村恒三吉川贵博池田哲朗
Owner NITTO DENKO CORP
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