Liquid crystal display device and turning film for liquid crystal display device

一种液晶显示装置、转向膜的技术，应用在转向膜领域，能够解决颜色不均、亮度不均等问题，达到抑制亮度不均、抑制颜色不均的效果
CN108628028AInactive Publication Date: 2018-10-09KEIWA INCORPORATED
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
KEIWA INCORPORATED
Publication Date
2018-10-09
Estimated Expiration
Not applicable · inactive patent

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Abstract

The present invention has an object to provide a liquid crystal display device and a turning film for use in a liquid crystal display device that are capable of inhibiting irregularities in color andluminance caused by polarization. The liquid crystal display device includes a liquid crystal panel; a light-guiding plate that is disposed on a back face side of the liquid crystal panel and is for guiding rays of light incident on an end face toward a front face side; an LED light source disposed along the end face of the light-guiding plate; and a turning film disposed between the liquid crystal panel and the light-guiding plate. The turning film includes: a substrate layer formed from a transparent resin; and a prism array disposed on a back face side of the substrate layer. A retardationvalue of the substrate layer is no less than 0 nm and no greater than 100 nm. In a planar view, a transmission axis of the back face side-polarizing plate of the liquid crystal panel is perpendicularto the end face of the light-guiding plate; the ridge lines in the prism array of the turning film are parallel to the end face of the light-guiding plate; and the transmission axis of the back face side-polarizing plate of the liquid crystal panel is perpendicular to the ridge lines in the prism array of the turning film.
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Description

technical field

[0001] The invention relates to a liquid crystal display device and a turning film for a liquid crystal display device. Background technique

[0002] Conventionally, as an optical sheet for a liquid crystal display device, various optical sheets having different optical characteristics exist, and a structure obtained by combining these optical sheets is used for a backlight unit for a liquid crystal display device. For example, a polyester film obtained by providing a prism sheet layer on a base film made of polyester such as polyethylene terephthalate is disclosed as an optical film aimed at improving brightness (Patent Document 1).

[0003] A film made of polyethylene terephthalate is generally produced by a biaxial stretching method. However, polyethylene terephthalate is a crystalline resin and has a large birefringence. Therefore, when polyethylene terephthalate is formed into a film by a biaxial stretching method, molecular orientation occurs dependin...

Claims

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