Prism sheet for backlight unit and liquid crystal display module
A backlight unit and prism sheet technology, applied in prisms, optical components, optics, etc., can solve problems such as difficult to display images, achieve the effects of suppressing phase difference changes, improving optical uniformity, and promoting large-screen
Inactive Publication Date: 2016-02-03
KEIWA INCORPORATED
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- Application Information
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Problems solved by technology
As a result, there is a problem that in a liquid crystal display module provided with an optical sheet using the above-mentioned resin in the base material layer, it is difficult to display an image finely as the liquid crystal display becomes larger and thinner.
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment 1
[0103] Using a cyclic olefin copolymer ("TOPAS8007" manufactured by Polyplastics Co., Ltd.), after pre-drying, it was melt-extruded on a cooling roll using a single-screw extruder (L / D=35), and a film with a thickness of 100μm optical film.
Embodiment 2
[0105] The optical film produced in Example 1 was subjected to ITO treatment by sputtering to produce an optical sheet (transparent conductive sheet) having a transparent conductive layer on one surface of the optical film.
Embodiment 3
[0107] On the optical film made in Example 1, a hard coat agent ("Ultraviolet UV-7605B" manufactured by Nippon Synthetic Chemical Industry Co., Ltd.) was applied to make the film thickness of the hard coat layer 5 μm, and it was cured to produce An optical sheet (hard coat film) having a hard coat layer on one side of the optical film was obtained.
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Abstract
PROBLEM TO BE SOLVED: To provide an optical film whose change in phase difference due to an external force is small, which has excellent optical uniformity, and which can display an image with high definition, and provide an optical sheet and a liquid crystal display module including the optical sheet.SOLUTION: An optical film according to the present invention includes a cycloolefin copolymer as a main component. The optical film preferably has a photoelastic coefficient of 10×10 / Pa or less. The optical film preferably has an average thickness of 10 μm or more and 500 μm or less. The optical film preferably has an absolute value of a retardation value (Re) of 50 nm or less. An optical sheet according to the present invention has a transparent conductive layer, a hard coat layer, a light diffusion layer, or a prism layer on one surface of the optical film. A liquid crystal display module according to the present invention includes the optical sheet.
Description
technical field [0001] The present invention relates to an optical film, an optical sheet and a liquid crystal display module with small phase difference change due to shrinkage stress and excellent optical uniformity. Background technique [0002] Liquid crystal display modules (LCD) are mostly used as flat-panel displays due to their thinness, lightness, and low power consumption. They are used as information display devices such as mobile phones, personal digital assistants (PDAs), personal computers, and televisions. expand. In recent years, depending on the application, various characteristics are required for liquid crystal display modules, such as brightness (higher brightness), ease of viewing (wider viewing angle), energy saving, thinner and lighter, and larger screens. Wait. [0003] The liquid crystal display module generally has the following structure: a liquid crystal display element, various optical sheets and a backlight are stacked sequentially from the fr...
Claims
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IPC IPC(8): G02B1/04G02B1/10G02B5/02G02B5/04G02F1/1335G02B5/30
CPCC08J5/18C08L45/00G02B1/04G02B5/04G02F1/13
Inventor 古田旭峯尾裕
Owner KEIWA INCORPORATED
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