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Light reflective film, and backlight unit for liquid crystal display device
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A technology of light reflective film and reflective film, applied in optical elements, optics, nonlinear optics, etc., can solve the problem of low durability of silver layer, and achieve the effect of high durability and high reflectivity
Inactive Publication Date: 2018-02-16
KONICA MINOLTA INC
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On the other hand, the silver layer has a problem of lower durability than aluminum
Method used
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Embodiment 1
[0226] On a polyethylene terephthalate film with a thickness of 25 μm (manufactured by Toray Co., Ltd., product name "Lumila T-60"), the above-mentioned solution 1 for a low refractive index layer was coated by a gravure coating method and dried. An anchor layer with a thickness of 100 nm was provided.
[0227] Silver was laminated on the anchor layer by a vacuum evaporation method to form a silver layer with a thickness of 100 nm.
[0228] Next, the solution 1 for the low-refractive index layer was coated on the silver layer by the gravure roll coating method, dried and cured at 100° C., and the low-refractive index layer L as an organic layer was formed. 1 .
[0229] Next, in the low refractive index layer L 1 Niobiumoxide (Nb 2 o 5 ) to form a film to form a high refractive index layer H as an inorganic layer 1 .
[0230] Next, in the high refractive index layer H 1 After coating solution 4 for the high refractive index layer (manufactured by Nissan Chemical Industr...
Embodiment 2～17、 Embodiment 21～26
[0232]
[0233] In addition to changing the layer composition of the low-refractive index layer group as shown in Table 1-1 and Table 1-2, and changing the layers of the high-refractive index layer group as shown in Table 2-1 and Table 2-2 Except for the configuration, a light reflection film was obtained in the same manner as in Example 1.
[0234] It should be noted that in Table 1-1 and Table 1-2, those corresponding to the low refractive index layer as the organic layer are "resin 1", "resin 2" and "resin 3", which are used in the organic layer of Example 1. Formed in the same way. In Table 1-1 and Table 1-2, what corresponds to the inorganic layer is "SiO2 ", "Al 2 o 3 ”, were formed by vacuum evaporation method.
[0235] In Table 2-1 and Table 2-2, "resin 4" and "resin 5" are equivalent to the organic layer, and the high refractive index layer H used as the organic layer in Example 1 2 Formed in the same way. In Table 2-1 and Table 2-2, the equivalent to the inorg...
Embodiment 18 and 19
[0237] On a polyethylene terephthalate film with a thickness of 25 μm (manufactured by Toray Co., Ltd., product name “Lumila T-60”), silver was laminated by a vacuum deposition method to form a silver layer with a thickness of 100 nm.
[0238] Next, on this silver layer, in the same manner as in Example 1, a group of low-refractive index layers having the layer configuration shown in Table 1-1 and a group of high-refractive index layers having the layer configuration shown in Table 2-1 were formed to obtain light reflective film.
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Abstract
The present invention relates to a light reflective film and a backlight unit for a liquid crystaldisplay device. The light reflective film of the present invention includes a base material, a silverlayer, a low refractive indexlayer group including one or more layers of low refractive indexlayers L, and a high refractive indexlayer group including one or more high refractive index layers H.At least one of the refractive index layer group and the high refractive index layer group contains an organic layer and an inorganic layer, the low refractive index layer L1 adjacent to the silver layer is an organic layer, and the low refractive index layer L1 in the low refractive index layer L is at least one of the one and / or high refractive index layers H is an inorganic layer, which satisfies the following formulae (1) and (2). (In formulas (1) and (2), nLk and dLk are the refractive index and film thickness of the low refractive index layer Lk, respectively, and nHk and dHk are the refractive index and film thickness of the high refractive index layer Hk, respectively). n is the number of layers in each group, and gamma 1 and gamma 2 are the minimum and maximum values of the wavelength region of incident light, respectively).
Description
technical field [0001] The present invention relates to a light reflection film and a backlight unit for a liquid crystaldisplay device. Background technique [0002] Conventionally, reflective members having metal reflective layers have been used in applications such as light reflective films for backlight units for liquid crystal display devices, reflective mirrors for projection televisions and optical devices, and reflective members for LED lighting. [0003] As such a reflective member, a reflective film including a silver layer is known. On the other hand, the silver layer has a problem that its durability is lower than that of aluminum. In order to overcome this problem, it has been considered to further laminate a layer containing a resin or an inorganic substance on the silver layer (for example, Patent Documents 1 and 2). [0004] Patent Document 1 describes a reflective sheet in which a low-refractive index layer and a high-refractive index layer are laminated ...
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