Microlens array film, preparation method thereof and LCD (Liquid Crystal Display) device

Abstract

The invention provides a microlens array film, a preparation method thereof and an LCD (Liquid Crystal Display) device using the film. The microlens array film comprises a substrate, a brightening coating is coated on the upper surface of the substrate and comprises an adhesive and organic particles, wherein the organic particles form a single-layer compactly-arranged microlens structure, and thethickness of the adhesive in the brightening coating is one half of the particle diameter of each organic particle. In the invention, the microlens array film is prepared by coating a composition containing the adhesive and the organic particles on the substrate; and the microlens array lens has the advantages of simple manufacture process, lower cost and higher brightness.

Description

technical field [0001] The invention relates to an optical film, in particular to a microlens (Microlens) array film, a preparation method thereof and a liquid crystal display device using the film. Background technique [0002] The backlight module is an important part of the liquid crystal display device. Since the liquid crystal itself does not emit light, the important function of the backlight module is to supply a surface light source with sufficient brightness and uniform light distribution for the liquid crystal display panel. FIG. 1 is a schematic cross-sectional view of a commonly used direct-type liquid crystal display device. Such as figure 1 As shown, a commonly used liquid crystal display device mainly includes a light source 11 , an optical reflective film 12 , a light guide plate 13 , a lower diffusion film 14 , a brightness enhancement film (or prism film) 15 , an upper diffusion film 16 and a liquid crystal panel 17 . Among them, the combination of the lo...

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Problems solved by technology

The liquid crystal display device with this structure has higher brightness, but compared with other optical films, the brightness enhancement film is more expensive and has a higher thickness, so it is easy to cause high cost and thicker thickness of the liquid crystal display device. The problem is not conducive to the development of liquid crystal display in the direction of light and thin

[0003] In recent years, people in the industry have begun to use other optical films to replace brightness enhancement films, such as combining two diffusion films to improve the brightness of liquid crystal display devices, such as using two commercially available BS912 diffusion films (Japan Huihe Co., Ltd.), and Compared with the liquid crystal display device using the brightness enhancement film, the lower diffusion film and the upper diffusion film in combination, the liquid crystal display device using two diffusion films is beneficial to reduce the cost, reduce the thickness of the liquid crystal display device, and facilitate the simplification of the manufacturing process , but at present, the brightness of liquid crystal display devices using this structure is low

[0004] In addition, the application of microlens array films to liquid crystal display devices has achieved a better brightness enhancement effect, making microlens array films a current research hotspot, such as using two commercially available UTE II-7 optical films (Korea MNTECH Co., Ltd. ) of the liquid crystal display device has a higher brightness, the current production method of the microlens array film includes mask forming method, etching method, photoresist melting cooling solidification method, microlens mold transfer method, ice template method, droplet method And micro-electromechanical manufacturing method, etc., but these methods are complicated in manufacturing process and difficult in operation, which is not conducive to industrial application

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