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Light-diffusing sheet, optical device, and image display

一种光扩散片、浊度的技术，应用在光学元件、光学、漫射元件等方向，能够解决树脂被膜层剥落、难以形成光扩散层、变质等问题，达到平衡性良好的效果

Inactive Publication Date: 2005-07-27
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, when a light-diffusing sheet having a resin coating layer formed on a cellulose triacetate film is exposed to a heated and humidified environment for a long time, the resin coating layer may peel off and deteriorate due to decomposition of the cellulose triacetate film.
In addition, recently, a norbornene-based resin film is used as a transparent film having excellent optical properties, but the adhesion between the film and the resin film layer is poor, and it is difficult to form a light-diffusing layer.

Method used

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  • Light-diffusing sheet, optical device, and image display
  • Light-diffusing sheet, optical device, and image display
  • Light-diffusing sheet, optical device, and image display

Examples

Experimental program
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Effect test

manufacture example 1

[0112] 75 parts by weight of an alternating copolymer (the content of N-methylmaleic anhydride imide is 50 mol%) made of isobutylene and N-methylmaleic anhydride imide, and the content of acrylonitrile is 28 parts by weight 25 parts by weight of the acrylonitrile-styrene copolymer was dissolved in methylene chloride to obtain a solution having a solid content concentration of 15% by weight. This solution was cast on a polyethylene terephthalate film, applied in the form of a glass plate, and after standing at room temperature for 60 minutes, it was peeled off from the film. After drying at 100° C. for 10 minutes, drying at 140° C. for 10 minutes, and then drying at 160° C. for 30 minutes gave a transparent film with a thickness of 50 μm. The in-plane phase difference of the transparent film was Re=4 nm, and the thickness direction phase difference Rth=4 nm.

[0113] In addition, the in-plane retardation Re and the thickness direction retardation Rth are the measurement result...

manufacture example 2

[0115] A glutarimide copolymer consisting of N-methylglutarimide and methyl methacrylate (N-methylglutarimide content 75% by weight, acid content 0.01 meq / g Hereinafter, 65 parts by weight of acrylonitrile-styrene copolymer having a glass transition temperature of 147°C) and 35 parts by weight of an acrylonitrile-styrene copolymer whose contents of acrylonitrile and styrene are 28% by weight and 72% by weight, respectively, were melt-kneaded to obtain a resin composition The material was supplied to a T-die melt extruder to obtain a film with a thickness of 135 μm. After the film was stretched 1.7 times in the MD direction at 160°C, it was stretched 1.8 times in the TD direction at 160°C. The obtained biaxially stretched transparent film had a thickness of 55 μm, an in-plane retardation Re=1 nm, and a thickness direction retardation Rth=3 nm.

Embodiment 1

[0117] With respect to 100 parts of acrylic urethane-based ultraviolet curable resin (urethane acrylate monomer), 12 parts of polystyrene particles with an average particle diameter of 3.5 μm, benzophenone-based photo 5 parts of polymerization initiator, 2.5 parts of thixotropic agent (mica) form the coating liquid that solid content concentration is 40% by weight, and above-mentioned coating liquid is coated on the transparent film that obtains by Manufacturing Example 1, at 120 ℃ After drying for 5 minutes, it was cured by irradiating ultraviolet rays to prepare a light-diffusing sheet having a resin film layer on a surface with a fine uneven structure with a coating film thickness of 7 μm.

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Abstract

A light-diffusing sheet comprises a transparent film and a light-diffusing layer composed of a resin coating layer having a rough surface and provided on at least one side of the transparent film. The transparent film contains (A) a thermoplastic resin having a substituted and / or unsubstituted imide group at a side chain and (B) a thermoplastic resin having a substituted and / or unsubstituted phenyl group and a nitryl group. The light-diffusing sheet hardly exhibits birefringence and is excellent in adhesion and durability. The ratio (internal haze / total haze) of the total haze of the light-diffusing sheet to the internal haze is 0.5 to 1.0 and the total haze is preferably 30 to 70%. When this sheet is applied to a high-definition LCD, the antiglareness is maintained, the glittering of the screen is prevented, and the whitening is hardly seen.

Description

technical field [0001] The present invention relates to a light diffusion sheet used in image display devices such as liquid crystal displays (LCDs), flat panel displays (FPDs), organic ELs, and PDPs to suppress deterioration of screen visibility, and optical elements provided with the light diffusion sheets. It also relates to an image display device using the above optical element. Background technique [0002] Conventionally, in image display devices such as LCDs, image visibility has been affected on the surface of the display device due to indoor lighting such as fluorescent lamps, sunlight incident on windows, and shadows of operators. Therefore, in order to improve image visibility, a light-diffusing layer formed with a fine concave-convex structure is provided on the display surface. The above-mentioned fine concave-convex structure can diffuse surface reflected light, suppress the one-way reflection of external light, and prevent the reflection of the external envir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/00G02B5/02
CPCC08L25/12G02B5/0242B32B27/00C08L35/00G02B5/0221G02B5/0278C08L2666/06G02B5/02
Inventor 矢野周治西田昭博前田洋惠近藤隆畑中武藏松永卓也
Owner NITTO DENKO CORP
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