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Polarizing plate, manufacturing method thereof, and optical device

A technology for polarizers and transparent substrates, which is applied in the direction of instruments, optics, and polarizing components. It can solve problems such as poor heat resistance or light resistance, and concerns about long-term use, and achieve low reflectivity, improved mechanical strength, and high transmittance. Effect

Active Publication Date: 2020-12-15
DEXERIALS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the base material used in Patent Document 2 is made of resin, it has inferior heat resistance and light resistance compared to a wire grid polarizing element made of an inorganic material, and there is concern about long-term use in a strong light environment.

Method used

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  • Polarizing plate, manufacturing method thereof, and optical device
  • Polarizing plate, manufacturing method thereof, and optical device
  • Polarizing plate, manufacturing method thereof, and optical device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～5 and comparative example 1

[0129] [Production of polarizer]

[0130] In Examples 1 to 5, as having figure 1 The polarizer 100 of the structure shown, and the step angle of the reflective layer 3 θ Polarizers with s of 87˚, 45˚, 21˚, 8˚, and 4˚ were used for simulation.

[0131] In addition, as Comparative Example 1, a polarizing plate 200 different from the polarizing plate 100 of Example 1 only in the structure of the absorbing layer 3 was fabricated and used for simulation. The polarizing plate 200 that became Comparative Example 1 was figure 2 In the shown structure, when viewed from the direction in which the lattice-shaped protrusions 20 extend (predetermined direction: Y-axis direction), that is, in a cross-sectional view perpendicular to the predetermined direction, the reflective layer 3 has a rectangular shape and does not have steps (steps). timing θ s=0°).

[0132] Step angle in polarizer 100 θ s is obtained by Equation 1 below.

[0133] [Formula 1]

[0134] θ s=arctan{Hs / (W﹣Ws)...

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Abstract

Provided are: a polarizing plate having high transmittance characteristics and suppressed reflected light, and a manufacturing method thereof; and and an optical device provided with said polarizing plate. A polarizing plate (100) having a wire grid structure comprises: a transparent substrate (1); and grid-like projection portions (20) arranged on the transparent substrate at a pitch shorter thanthe wavelength of light in a used bandwidth and extending in a predetermined direction. The grid-like projection portions (20) each have a reflective layer (3) and a dielectric layer (4) in order from the transparent substrate (1) side, wherein when viewed from the predetermined direction, the reflective layer (3) has at least one step on the side thereof and has the largest bottom width on the transparent substrate (1) side.

Description

technical field [0001] The present invention relates to a polarizing plate, a manufacturing method thereof, and an optical device. Background technique [0002] Conventionally, as a polarizing element, an absorption-type wire grid polarizing element has been proposed in which a metal grid is formed on a substrate at a pitch smaller than the wavelength of light in the frequency band used, and a dielectric layer and an inorganic fine particle layer are formed on the metal grid. , so that the interference effect is used to cancel the light reflected by the metal grid, while allowing the other polarized component to be transmitted (passed through). [0003] With regard to such a polarizing element, there is an increasing demand for a reduction in reflectance along with higher brightness and higher definition of liquid crystal projectors in recent years. When the reflectance is high, it becomes a cause of malfunction of the liquid crystal panel, or deterioration of image quality...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30F21V7/00F21V9/14G02F1/1335
CPCF21V9/14F21V7/00G02F1/1335G02B5/3058
Inventor 涩谷和幸榊原重司菅原利明松野雄介高田昭夫
Owner DEXERIALS CORP