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Optical film, forming method thereof and display apparatus containing the same
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An optical film and polarizing film technology, applied in the field of optical films, can solve the problems of changing the warpage degree of thin polarizers
Active Publication Date: 2010-06-30
DAXON TECH INC
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However, when the ambient humidity or temperature of the thin polarizing plate is changed during transportation or stored in the panel factory, the degree of warping of the thin polarizing plate will also change. Widely adopted by the industry
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[0058] Provide a polyvinyl alcohol film, swell in a water tank with a temperature of about 25°C to 35°C, and then put the swollen polyvinyl alcohol film into boric acid with 3.0wt% to 5.5wt% and 2.0wt% to 6.0wt% % Potassiumiodideaqueous solution, while stretching at a stretching ratio of 3 to 7 times, so as to form the polarizing layer 210, such as figure 2 shown. And the formed polarizing layer 210 is usually an iodine-containing polyvinyl alcohol film with a thickness of 20 μm˜35 μm, its monomertransmittance is over 43%, and the degree of polarization is over 99.9%.
[0059] Next, the saponified triacetate film 220 / 230 is bonded to the upper and lower sides of the polarizing layer 210 by hydrogel, so as to form the polarizing film 200 . The aforementioned polarizing film 200 was dried under the drying conditions shown in Table 1 below.
[0060] Table 1
[0061]
[0062] With the polarizing film that above-mentioned embodiment 1~4 completes, refer to image 3Samp...
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Abstract
The invention provides an optical film and a forming method thereof. The forming method of the invention comprises the steps as follows: a polarized layer is provided; at least a euphotic layer is formed on the polarized layer, wherein, the euphotic layer and the polarized layer form a polarized film and a dry polarized film so as to lead the ratio (E) of dimension changing quantity (Delta<MD>) in the extension direction and the dimension changing quantity (Delta) in the width direction of the polarized film after the heating process not to be less than the prearranged value. The invention provides the optical film which is not easy to generate the warping phenomenon and the forming method thereof.
Description
technical field [0001] 本发明大体上涉及一种光学膜,尤其涉及一种可改善翘曲现象的光学膜、其形成方法以及包含该光学膜的显示装置。 Background technique [0002] 近年来由于液晶屏幕不管小尺寸或大尺寸均需要厚度较薄的偏光板来实现其质量轻、薄的要求。然而,要达成所述变薄要求必须降低偏光板中各层材料的厚度,例如三醋酸纤维膜、感压胶层及聚乙烯醇膜等。其中最常用的方法是降低三醋酸纤维膜的厚度,通常还将使用不大于40μm的三醋酸纤维膜所形成的偏光板泛称为薄型偏光板。 [0003] 然而,在偏光板的厚度变薄、面积变大后,面板厂在液晶玻璃上进行薄型偏光板粘合时常常发生一些问题,如偏光板与玻璃剥离(peeling)、产生气泡或撕去离型膜的偏光板发生翘曲等。其中,尤其是偏光板撕去离型膜后的翘曲问题目前仍无法有效解决,已知有三种作法,将讨论如下。 [0004] 第一种已知作法是利用傅立叶转换红外光谱仪(FTIR),针对偏光板两侧的三醋酸纤维膜中塑化剂的含量比例进行监测,从而控制不易翘曲的薄型偏光板的生产状况。然而,该测量方法会因为取样位置的差异和仪器误差范围的精确度上的困扰,使得该方法并不可行。 [0005] 第二种已知作法是利用机械性能抑制翘曲问题的发生,换言之,该方法必须进行防止变形用薄膜(例如保护膜)的粘合步骤,并同时控制薄膜粘合时的机械张力,从而改善薄型偏光板翘曲问题。然而,就性能方面来说,也会有因薄膜变形而发生剥离的情形或撕除保护膜后翘曲的情形更严重的状况发生。 [0006] 第三种已知作法是利用改变薄型偏光板的存贮环境湿度或温度,达到薄型偏光板翘曲程度的改善。但是,当薄型偏光板在运送过程中或存贮于面板厂的环境湿度或温度改变时,薄型偏光板的翘曲程度也将有所改变,因此,如同第二种已知作法通常并未被业界广泛采纳。 [0007] 因此,需要一种不需利用外加机械力或改变环境等作法,也不易发生翘曲现象的光学膜及其形成的方法。 Contents of the invention [0008] 本发明的一个方面在提供一种光学膜,使撕去离型膜后不易发生翘曲现象。 [0009] 于一个实施例中,本发明提供一种光学膜,包括:偏光层;以及至少一个透光层,位于偏光层的一侧,其中偏光层和透光层...
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