Polarizing plate, method for manufacturing polarizing plate, image display device, method for manufacturing image display device, and method for improving transmittance of polarizing plate
一种图像显示装置、制造方法的技术，应用在偏光片领域，能够解决偏光度下降、纤维素酯膜透湿度高、透过率下降等问题
Inactive Publication Date: 2016-04-20
DAI NIPPON PRINTING CO LTD
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- Description
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- Application Information
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Problems solved by technology
[0006] However, the cellulose ester film has problems such as that the degree of polarization caused by discoloration decreases when subjected to a humidity resistance test due to excessively high moisture permeability.
[0010] Therefore, when a polarizer using a light-transmitting base material having birefringence in the plane, such as a polyester film, is used as a polarizer on the backlight side of a liquid crystal display device, after passing through the polarizing separation film, The polarization state of the specific polarizing component changes, which may lead to a decrease in transmittance
Method used
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Experimental program
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Effect test
Embodiment 1
[0140] Using the three-dimensional refractive index wavelength dispersion of the translucent substrate a, the transmittance of the polarizer was calculated so that the angle formed by the fast axis of the translucent substrate and the transmission axis of the polarizer was 0°.
Embodiment 2
[0142] Using the three-dimensional refractive index wavelength dispersion of the translucent substrate a, the transmittance of the polarizer was calculated by setting such that the angle formed by the fast axis of the translucent substrate and the transmission axis of the polarizer was 90°.
Embodiment 3
[0146] Using the three-dimensional refractive index wavelength dispersion of the translucent substrate b, the transmittance of the polarizer was calculated so that the angle formed by the fast axis of the translucent substrate and the transmission axis of the polarizer was 0°.
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Abstract
This invention provides a polarizing plate that excels in terms of transmittance even if a light-transmitting substrate that has no in-plane phase difference is used. Said polarizing plate, which is used on the backlight-light-source side of an image display device, comprises at least a light-transmitting substrate that exhibits in-plane birefringence and a polarizer, layered in that order from the backlight-light-source side. Said polarizing plate is characterized in that: polarized light is incident on the light-transmitting substrate that exhibits in-plane birefringence; and said light-transmitting substrate and the polarizer are layered such that the transmission axis of the polarizer forms an angle of either 0 DEG+-30 DEG or 90 DEG+-30 DEG with the fast axis of the light-transmitting substrate, i.e. the direction in which the index of refraction thereof is lower.
Description
technical field [0001] The present invention relates to a polarizer, a method for manufacturing the polarizer, an image display device, a method for manufacturing the image display device, and a method for improving light transmittance of the polarizer. Background technique [0002] Liquid crystal display devices are used in various fields in place of conventional CRT displays due to their features such as power saving, light weight, and thin profile. In particular, liquid crystal display devices are indispensable in mobile devices such as mobile phones and smart phones that have spread rapidly in recent years. [0003] Such a liquid crystal display device is known as a structure in which, for example, a pair of polarizers are arranged in a vertical Nicol relationship on the viewer side and the backlight side with liquid crystal cells interposed between them on the backlight. [0004] In the liquid crystal display device with such a structure, the light irradiated from the ...
Claims
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IPC IPC(8): G02B5/30G02F1/1335
CPCG02B5/3041G02B5/305G02B5/3083G02B27/283G02F1/133528G02F1/13362G02F1/133531G02F1/13355G02B5/3025
Inventor 黑田刚志
Owner DAI NIPPON PRINTING CO LTD