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Wavelength conversion member, backlight unit provided with same, and liquid crystal display device

A wavelength conversion and wavelength conversion layer technology, applied in the field of backlight units, can solve problems such as the reduction of luminous intensity

Active Publication Date: 2017-05-24
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In quantum dots, there is a problem that light emission intensity decreases due to photooxidation reaction when exposed to oxygen

Method used

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  • Wavelength conversion member, backlight unit provided with same, and liquid crystal display device
  • Wavelength conversion member, backlight unit provided with same, and liquid crystal display device
  • Wavelength conversion member, backlight unit provided with same, and liquid crystal display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0188] The first PET 1 was prepared, and was continuously transported at 1 m / min and 60 N / m tension, and the polymerizable composition 1 containing quantum dots was coated on the inorganic layer with a die coater to form a coating film with a thickness of 50 μm. Next, the first PET1 with the coating film formed thereon is wound around a support roll, the second PET1 is laminated on the coating film in the direction where the inorganic layer contacts the coating film, and the first PET1 and the second PET1 are used to sandwich the coating film. In the state, it passed through the heating zone of 100 degreeC for 3 minutes, conveying continuously. Thereafter, it was cured by irradiating ultraviolet light with a 160 W / cm air-cooled metal halide lamp (manufactured by EYE GRAPHICS CO., LTD.), to form a wavelength conversion layer containing quantum dots. The amount of ultraviolet radiation is 2000mJ / cm 2 .

Embodiment 2～6 and comparative example 1～4

[0190] Wavelength converting members of other examples and comparative examples were fabricated in the same manner as in Example 1 except that the base film or barrier layer was changed to those described in Table 1.

[0191] (Evaluation of Brightness)

[0192] A commercially available tablet terminal (manufactured by Amazon.com, Inc., Kindle Fire HDX 7") was disassembled, and QDEF (quantum dot film manufactured by 3M Company) was taken out from the backlight unit, and the examples and comparisons cut in a rectangular shape were assembled. Example wavelength conversion member was used instead of QDEF. In this way, a liquid crystal display device was fabricated.

[0193] The produced liquid crystal display device was turned on so that the entire surface displayed white, and measured with a luminance meter (SR3, manufactured by TOPCON CORPORATION) installed at a position 740 mm vertical to the surface of the light guide plate. The measurement results are shown in Table 1.

[0...

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Abstract

[Problem] To provide a wavelength conversion member having a wavelength conversion layer containing quantum dots that emit fluorescent light upon being irradiated by excitation light; wherein light loss is reduced. The present invention provides a high-brightness backlight unit and liquid crystal display device. [Solution] A wavelength conversion member (1D) having a wavelength conversion layer (30) containing quantum dots (30A, 30B), which are excited by excitation light (LB) and emit fluorescent light (LR,LG), wherein the wavelength conversion layer (30) is provided with a substrate film (11, 21) on at least one surface, the substrate film (11, 21) being such that the total light transmittance is less than 92% and the absorption rate for light having a wavelength of 450 nm is less than 0.9% as measured using an integrating sphere.

Description

technical field [0001] The present invention relates to a wavelength conversion member having a wavelength conversion layer including quantum dots that emit fluorescence upon irradiation with excitation light, a backlight unit provided with the wavelength conversion member, and a liquid crystal display device. Background technique [0002] Flat-panel displays such as liquid crystal display devices (hereinafter also referred to as LCDs) are increasingly used as image display devices that consume less power and save space. A liquid crystal display device is at least composed of a backlight source and a liquid crystal cell, and usually includes backlight side polarizers, viewing side polarizers and other components. [0003] In recent years, for the purpose of improving the color reproducibility of LCD, the wavelength conversion member of the backlight unit is provided with a structure of a wavelength conversion layer containing quantum dots (also called Quantum Dot, QD, quantu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/20G02F1/13357
CPCG02B6/005G02B6/0055G02F1/133602G02F1/133617G02F2202/36G02F1/133614G02F1/133621
Inventor 山田直良佐藤宏一
Owner FUJIFILM CORP
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