Large-size micro-permeable composite film and preparation method thereof

Abstract

The invention provides a large-size micro-permeable composite film. The composite film comprises a first PET base material, a second PET base material and a UV adhesive layer, wherein a layer of PMMAmicrobeads is uniformly arranged on the lower surface of the first PET base material; a hemispherical micro-permeable structure with a diameter ranges from 70 to 90 microns is uniformly arranged on the upper surface of the second PET base material; the thickness of the first PET base material is 180-190 microns; the thickness of the second PET base material is 240-260 microns; and the thickness ofthe UV adhesive layer is 3-8 microns. The invention also provides a preparation method of the composite film. According to the composite film, the rigidity is improved through the base material withlarger thickness; meanwhile, the UV adhesive layer with the minimum thickness can be obtained through two times of ultraviolet light curing, and the light transmission performance of the composite film is improved, the refractive index of light is improved through the mode of increasing the radius of the micro-transparent structure; and the haze of the composite film is further improved through PMMA microbeads after two times of light scattering.

Description

technical field [0001] The invention relates to an optical film that can be used in the field of optical display, in particular to a large-size micro-permeable composite film with a large display area, such as liquid crystal displays and lighting systems, and a preparation method thereof. Background technique [0002] Various composite diaphragms are often used in the fields of optical display and lighting. For example, liquid crystal displays, televisions, etc., the size of the composite diaphragms used in them is becoming larger and larger. The main problem of existing large-scale composite diaphragms used in optical display, lighting and other fields is uneven brightness, which is related to the type, shape and position of the light source on the one hand, and also to the quality of the composite diaphragm on the other hand. There is a great correlation. A good composite film can effectively scatter light, and can cover the light shadow of the light source, so it can ge...

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned composite film of the prior art has a certain advantage in light transmittance because its thickness is lower than that of the traditional diaphragm, but because the thickness of the diaphragm is too thin, when it is used in the field of large-scale optical display, it will be used for insufficient rigidity. And prone to warping, causing ripples and uneven brightness in the display area

In addition, because the composite diaphragm of this prior art is formed by the composite of microtransparent film and prism film, there will be some differences along the brightness of prism stripes and the brightness perpendicular to the direction of prism stripes. When used on a screen), it does not cause too much of a problem due to the relatively horizontal viewing angle

However, in large-scale optical display and lighting systems, uneven brightness at different angles is difficult to satisfy users, and the cost of combining two different films is relatively high. In the field of large-scale optical display and lighting, Difficult to promote and use on a large scale

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