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Wire-grid polarizers, methods of fabrication thereof and their use in transmissive displays

A wire grid polarizer, display technology, used in instruments, polarizing elements, nonlinear optics, etc.

Inactive Publication Date: 2007-10-17
EI DU PONT DE NEMOURS & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practice, even the most reflective metals used as mirrors absorb part of the incident light and reflect only 90-95% of the incident light, and flat glass does not transmit 100% of the incident light due to surface reflections. incident light

Method used

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  • Wire-grid polarizers, methods of fabrication thereof and their use in transmissive displays
  • Wire-grid polarizers, methods of fabrication thereof and their use in transmissive displays
  • Wire-grid polarizers, methods of fabrication thereof and their use in transmissive displays

Examples

Experimental program
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Effect test

Embodiment 1

[0065] The sample was prepared as follows: a third of the Microposit  Type P Thinner (Rohm and Haas Electronic Materials, LLC, Marlborough, MA) and two-thirds Microposit  A mixture of S1805 Positive Photoresist (Rohm and Haas Electronic Materials, LLC, Marlborough, MA) was spin-coated at 3500 RPM for 30 seconds onto a sheet of 152mm x 100mm x 2mm thick soda-line glass. Next, the glass sheet was dried on a hot plate at 100° C. for 15 minutes. The glass slide was placed in a Lloyd's mirror set-up at 56° incident. The glass slide was exposed for 30 seconds to a 364.8 nm line from a Coherent Argon Saber Laser (Coherent, Inc., Santa Clara, CA), forming a sinusoidal interference pattern with a peak-to-peak period of 220 nm. Next, the samples were prepared in 4 parts deionized water and 1 part Microposit  351 developer (Rohm and Haas Electronic Materials, LLC, Marlborough, MA) was developed for 20 seconds, rinsed with deionized water for 10 seconds, and dried with forced air. ...

Embodiment 2

[0068] The columns in Table 1 show the inventive examples described above along with 3M's DBEF (available from 3M, St. Paul, MN), commercially available Moxtek wire grid polarizers (available from Edmund Scientific (Barrington, NJ)) and Nitto NPF polarizer (available from Nitto Denko, Shatin, N.T., Hong Kong).

[0069] Tvis(single) is the total transmission measurement of a single polarizer along the visible spectrum, reported as a percentage of incident light. Tvis (parallel) is a total transmission measurement along the visible spectrum of two identical polarizers whose polarization axes are parallel, reported as a percentage of the incident light to the first polarizer. Tvis (crossover) is the total transmission measurement along the visible spectrum of two identical polarizers whose polarization axes are perpendicular (90 degrees), recorded as percentage.

[0070] The efficiency ratio is the square root of ([Tvis(parallel)-Tvis(cross)] / [Tvis(parallel)+Tvis(cross)]...

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Abstract

Wire-grid polarizers (WGPs) and their use in transmissive displays are disclosed. The displays contains these WGPs possess high contrast and brightness characteristics in comparison to prior art displays.

Description

technical field [0001] The present invention relates to a wire-grid polarizer (WGP, wire-grid polarizer), its manufacturing method and its use in a transmissive display. Background technique [0002] A wire grid polarizer is an optical device used to transmit light of a specific polarization direction while reflecting light of an orthogonal polarization direction. [0003] The use of arrays of parallel wires to polarize radio waves has been known for more than 110 years. Wire grids (typically arrays of thin parallel conductors, supported or unsupported on transparent substrates) have also been used as polarizers in the infrared portion of the electromagnetic spectrum. [0004] A key factor determining the performance of a wire grid polarizer is the relationship between the center-to-center spacing or period of the parallel grating elements and the wavelength of the incident radiation. If the grating pitch or period is large compared to the wavelength, then the grating acts...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G02F1/1335
CPCG02B6/0051G02F1/133536G02B6/0056G02B6/0055G02B5/3058G02B5/30
Inventor S·W·麦克马斯特
Owner EI DU PONT DE NEMOURS & CO