Extruded brightness enhancement film and preparation method thereof

A brightness-enhancing film and extrusion-type technology, which is applied in optics, instruments, optical components, etc., can solve problems such as complex manufacturing processes, and achieve the effects of simple and convenient processes, high light transmittance, and reduced thickness

Inactive Publication Date: 2017-06-20
NINGBO CHANGYANG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of complex manufacturing process of the existing coating-type brightness-enhancing film, the present invention provides an extrusion-type brightness-enhancing film and its preparation method

Method used

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  • Extruded brightness enhancement film and preparation method thereof
  • Extruded brightness enhancement film and preparation method thereof
  • Extruded brightness enhancement film and preparation method thereof

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preparation example Construction

[0043] Such as figure 2 As shown, the present invention provides a kind of preparation method of extruded brightness enhancing film, and described method comprises the following steps:

[0044] (1) The three-layer co-extrusion of the extruder simultaneously extrudes the base film layer 2, the brightening layer 1, and the particle layer 3. When the molding is not cooled, the brightening layer is rolled with a prism structure embossing roller to make the brightening layer form a prism structure;

[0045] (2) Forming the brightness enhancing film after cooling and molding.

Embodiment 1

[0047] The invention provides an extruded brightness enhancing film, wherein the brightness enhancing film is composed of a base film layer, a brightness enhancing layer and a particle layer, and the brightness enhancing layer and the particle layer are respectively located on both sides of the base film layer; the The brightness enhancing film is a three-layer co-extruded structure. The brightness enhancement layer has a micro-prism structure.

[0048] The material of the brightening layer is polymethyl methacrylate (PMMA), and the height of the microprism structure is 20 μm, and the width is 40 μm.

[0049] The refractive index of the brightness enhancing layer material is 1.55.

[0050] The base film layer is made of PET with a thickness of 150 μm.

[0051] The particle layer includes diffusion particles and polyester resin, and the diffusion particles are bonded to the upper surface of the base film layer through the polyester resin.

[0052] In the particle layer, the ...

Embodiment 2

[0056] Extruded brightness enhancing film as described in embodiment 1, wherein,

[0057] The material of the brightening layer is polymethyl methacrylate (PMMA), the height of the microprism structure is 25 μm, the width is 50 μm, and the angle of the apex is 90°.

[0058] The refractive index of the brightness enhancing layer material is 1.55.

[0059] The base film layer is made of PET with a thickness of 150 μm.

[0060] The particle layer includes diffusion particles and polyester resin, and the diffusion particles are bonded to the upper surface of the base film layer through the polyester resin.

[0061] In the particle layer, the diffusion particles are organic silicon particles; the polyester is pure PET; in the particle layer, the weight of the diffusion particles accounts for 2% of the total weight of the particle layer material, and PET accounts for 98%. The particle size of the diffused particles is 2 μm, and the thickness of the particle layer is 10 μm.

[006...

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Abstract

The present invention relates to a brightness enhancement film used by backlight in a liquid crystal display, especially to an extruded brightness enhancement film and a preparation method thereof. In order to solve the problem that the current coating brightness enhancement film is complex in manufacturing technology, the present invention provides an extruded brightness enhancement film and a preparation method thereof. The extruded brightness enhancement film is formed by a brightness enhancement layer, a base film layer and a particle layer in order. The brightness enhancement layer and the particle layer are respectively located at two sides of the base film layer, and the brightness enhancement layer is a three-layer co-extrusion structure. In the preparation process, the brightness enhancement layer, the base film layer and the particle layer are subjected to coextrusion and then curtain coating, a compression roller is employed to roll the brightness enhancement layer to form a brightness enhancement structure, the cooling shaping is performed, and an extruded brightness enhancement film is obtained. The extruded brightness enhancement film has high luminance appearance, and the preparation method of the extruded brightness enhancement film provided by the invention is simple and convenient in technology so as to improve the production efficiency and reduce the production cost.

Description

technical field [0001] The invention relates to a brightness-enhancing film used in a backlight source in a liquid crystal display, in particular to an extruded brightness-enhancing film and a preparation method thereof. Background technique [0002] Brightness enhancement film is one of the most important optical films widely used in backlight modules of liquid crystal displays. The main function of brightness enhancement film is to improve light utilization, reduce light loss, increase backlight brightness, or reduce power consumption. Its brightening principle is to use its special prism structure to concentrate the light to achieve the purpose of brightening. [0003] At present, the preparation of brightness enhancement film is firstly mold making, a layer of copper is electroplated on the mold, surface treatment is carried out after electroplating, and then fine structures are carved on the surface of the mold with a knife. Then prepare a PET base film and coat a laye...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/02B29C47/06B29C47/92B29C48/92
CPCB29C48/002B29C48/18B29C48/92B29C2948/9258B29C2948/92704G02B5/0226G02B5/0231G02B5/0268
Inventor 金亚东张克然王陈
Owner NINGBO CHANGYANG TECH
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