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Anisotropic diffusion film

An anisotropic and thin-film technology, applied in the field of anisotropic diffusion thin films, can solve the problems of cost increase and non-high efficiency, and achieve the effect of high uniformity and high production efficiency

Inactive Publication Date: 2008-11-05
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] On the other hand, the demand for brighter surface light sources (requirements for higher brightness) has been increasing. As a method of increasing brightness, for example, there are methods of increasing the number of lamp tubes or increasing output power, but these methods become costly. Greatly improved factor, also non-efficient method

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] Polyethylene terephthalate (SPG-PET, glass transition temperature 105°C, intrinsic viscosity 0.71dl / g), and from the main extruder, polyethylene terephthalate (PET, vitrified Transition temperature 75°C) for melt 2-layer co-extrusion, and make the laminate thickness ratio SPG-PET / PET = 1 / 2, and cool on the casting drum with mirror surface by electrostatic application method to produce 2-layer laminated sheet. The 2-layer laminate thus obtained was simultaneously biaxially stretched 3 times in the longitudinal and transverse directions at a temperature of 110°C, and then heat-treated at a temperature of 235°C for 15 seconds to obtain a polyester film having a total film thickness of 250 µm.

[0087] On the SPG-PET laminated surface of the obtained polyester film, using a mold with a corresponding shape, transfer molding was performed at a heating temperature of 130°C and a cooling temperature of 20°C to obtain a convex strip lens with an aspect ratio of 1.52. Here, the in...

Embodiment 2

[0091] Polyethylene terephthalate (SPG-PET, glass transition temperature 105° C., intrinsic viscosity 0.64 dl / g), and from the main extruder, polyethylene terephthalate (PET, vitrified Transition temperature 75°C) for melt 2-layer co-extrusion, and make the laminate thickness ratio SPG-PET / PET = 1 / 2, and cool on the casting drum with mirror surface by electrostatic application method to produce 2-layer laminated sheet. The 2-layer laminate thus obtained was simultaneously biaxially stretched 3 times in the longitudinal and transverse directions at a temperature of 110°C, and then heat-treated at a temperature of 235°C for 15 seconds to obtain a polyester film having a total film thickness of 300 µm.

[0092] On the SPG-PET laminated surface of the obtained polyester film, using a mold with a corresponding shape, transfer molding was performed at a heating temperature of 130°C and a cooling temperature of 20°C to obtain a convex strip lens with an aspect ratio of 2.04. Here, t...

Embodiment 3

[0096] Polyethylene terephthalate (SPG-PET, glass transition temperature 105°C, intrinsic viscosity 0.71dl / g), and from the main extruder, polyethylene terephthalate (PET, vitrified Transformation temperature 75°C) to melt the two layers and extrude them so that the laminate thickness ratio is SPG-PET / PET=1 / 2, and cool on a mirror-surfaced casting drum by electrostatic application to produce a two-layer laminated sheet. The 2-layer laminate thus obtained was simultaneously biaxially stretched 3 times in the longitudinal and transverse directions at a temperature of 110°C, and then heat-treated at a temperature of 235°C for 15 seconds to obtain a polyester film having a total film thickness of 250 µm.

[0097] On the SPG-PET laminated surface of the obtained polyester film, using a mold with a corresponding shape, transfer molding was performed at a heating temperature of 130°C and a cooling temperature of 20°C to obtain a convex strip lens with an aspect ratio of 1.55. Here, ...

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Abstract

A novel anisotropic diffusion film has a high brightness, high illuminance uniformity ratio and a high productivity, and is suitable especially for a planar light sources of planar display devices for liquid crystal display devices and the like, such as a direct backlight. In the anisotropic diffusion film, a protruding stripe-shaped lens is formed on one surface of a base material film. The cross sectional shape of a plane vertical to the stripe direction satisfies the following conditions (A-C) and the total light transmittance of the anisotropic diffusion film is 70% or more. A The outline of the protruding part of the cross sectional shape is a curved line. B The aspect ratio of the protruding part of the cross sectional shape is 1 or more but not more than 3. C The distance between the summits of the adjacent protruding parts of the cross sectional shape is 10mum or more but not more than 100mum.

Description

technical field [0001] The present invention relates to an anisotropic diffusion film, and particularly relates to an anisotropic diffusion film which is very suitable for surface light sources used in flat display devices such as liquid crystal display devices. [0002] In the present invention, the so-called anisotropic diffusion film is a film in which the distribution of diffused light passing through the film is not isotropic when light is incident perpendicularly to the surface of the film. That is, it refers to the distribution of diffused light on an arbitrary plane including the axis of incident light rays (here, any plane is perpendicular to the film surface), and the distribution of diffused light on a plane perpendicular to the plane and including the axis of incident light rays Distribution of different films. Background technique [0003] In recent years, displays using liquid crystals have been widely used as display devices such as personal computers, televi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/02G02F1/1335G02B3/00G02F1/13357
CPCG02B5/0231G02B3/0031G02F2001/133607G02F2001/133507G02B5/0257G02B3/005G02F1/133507G02F1/133607
Inventor 高桥弘造菊池朗和高桥宏光
Owner TORAY IND INC