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Polarizing plate and optical display device including same

A technology of polarizing plates and polarizers, applied in the direction of optical components, optics, polarizing components, etc.

Active Publication Date: 2019-07-16
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when a polarizing plate including a PC retardation film having a high photoelastic coefficient is left at a high temperature, the PC retardation film may suffer thermal degradation including color deformation, thereby causing heat-induced mura defects (heat- induced murder)

Method used

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  • Polarizing plate and optical display device including same
  • Polarizing plate and optical display device including same
  • Polarizing plate and optical display device including same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0097] Fabricated by stretching a polyvinyl alcohol film (PS#60, thickness before stretching: 60 μm, Kuraray Co., Ltd., Japan) to 6 times its original length in an iodine aqueous solution at 55° C. transmittance of the polarizer. A triacetyl cellulose film (TAC, T25UL, Fuji Co., Ltd.) was adhered to the upper surface of the polarizer by a water-based adhesive.

[0098] The composition that is used for hard coating and contains urethane acrylate resin is coated on modified polycarbonate retardation film (modified PC film, WW142, Re:142nm, under the wavelength of 550nm, photoelastic coefficient: 45× 10 -12 Pa -1 , Teijin Co., Ltd.), followed by curing, thereby preparing a modified PC film having a coating layer (pencil hardness: 2H) thereon.

[0099] A modified PC film on which a hard coat layer was formed was adhered to a lower surface of a polarizer using a UV-curable adhesive, thereby preparing a polarizing plate. The optical axis (absorption axis) of the modified PC film...

Embodiment 2

[0102] Fabricated by stretching a polyvinyl alcohol film (PS#60, thickness before stretching: 60 μm, Kuraray Co., Ltd., Japan) to 6 times its original length in an iodine aqueous solution at 55°C, ratio of 45% for polarizers. A triacetylcellulose film (TAC, T25UL, Fuji Co., Ltd.) was bonded to the upper surface of the polarizer by a water-based adhesive.

[0103] The acrylic composition that is used for hard coating is applied to modified polycarbonate retardation film (modified PC film, WW142, Re: 142nm, under the wavelength of 550nm, photoelastic coefficient: 45 * 10 -12 Pa -1 , Teijin Co., Ltd.), followed by curing, thereby preparing a modified PC film having a coating layer (pencil hardness: B) formed thereon.

[0104]A triacetylcellulose film (TAC, T25UL, Fuji Co., Ltd.) was adhered to the lower surface of the polarizer by a water-based adhesive. A modified PC film having a hard coat layer formed thereon was bonded to the lower surface of the triacetylcellulose film us...

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Abstract

The present invention relates to a polarizing plate comprising: a polarizer; and a phase difference film formed on one surface or both surfaces of the polarizer and comprising a A coating equal to or greater than pencil hardness B, wherein, at 23° C. and at a wavelength of 590 nm, the retardation film has about 5×10 ‑12 (Pa ‑1 ) to about 60×10 ‑12 (Pa ‑1 ) of the optical elastic coefficient.

Description

technical field [0001] The present invention relates to a polarizing plate and an optical display including the same. Background technique [0002] Organic Light Emitting Diode (OLED) displays are self-emissive displays. However, the OLED causes mutual interference between internal light emitted from an internal light source and external light (natural light) received from the outside, thereby causing deterioration of display performance. A polarizing plate includes a λ / 4 retardation film (retardation film) and a polarizer to serve as an antireflection filter. External light passing through the polarizing plate is reflected and rotated by the OLED reflective plate and counterbalanced, thereby improving the performance of the display. [0003] Conventionally, a cyclic olefin polymer (COP) film is used as a λ / 4 retardation film, but cracks. Therefore, polycarbonate (PC) film is used as the λ / 4 retardation film because polycarbonate film does not crack (due to its high photo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30H01L51/50
CPCG02B5/3083H10K59/8791
Inventor 高门甫金龙云
Owner SAMSUNG SDI CO LTD