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
CN112088326AActive Publication Date: 2020-12-15DEXERIALS CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
DEXERIALS CORP
Publication Date
2020-12-15

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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.
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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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