npsm 새물리 New Physics : Sae Mulli

pISSN 0374-4914 eISSN 2289-0041
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Research Paper

New Phys.: Sae Mulli 2020; 70: 692-697

Published online August 31, 2020 https://doi.org/10.3938/NPSM.70.692

Copyright © New Physics: Sae Mulli.

Analysis of an Ultraviolet Polarizer by Using a Pile of Fused Quartz Plates

Seung-Eun KIM1, Jong-Rak PARK*2

1Mobility Convergence Research Center, Korea Photonics Technology Institute, Gwangju 61007, Korea

2Department of Photonic Engineering, Chosun University, Gwangju 61452, Korea

Correspondence to:ejrpark@chosun.ac.kr

Received: May 25, 2020; Revised: June 22, 2020; Accepted: July 1, 2020

Abstract

For ambient contrast ratio enhancement, liquid crystal retardation films coated on top of a photo-alignment layer can be used as constituents of a wide-band circular polarizer in organic light-emitting diode displays. For the production of polarized ultraviolet (UV) light for photo alignment, a wire-grid or pile-of-plates polarizer can be utilized. Employing a large-scale UV polarizer is essential for manufacturing large-area film. The pile-of-plates polarizer is superior to the wire-grid polarizer in terms of fabrication cost and scalability. In this study, we performed polarization ray tracing simulations for optical configurations in which a pile of fused quartz plates was placed at the Brewster's angle under a UV lamp module used for the UV curing process. Two types of polarizer structures (one-body and partitioned-body) were examined for three polarization directions (0$^{\circ}$, 15$^{\circ}$, and 75$^{\circ}$ relative to the machine direction). We found that total UV power on the receiver decreased and polarization efficiency increased with the increasing of quartz plates. In addition, the partitioned- body type structure exhibited better illuminance uniformity than the one-body type structure.

Keywords: Optical design, Ultraviolet polarizer, Pile of fused quartz plates, Simulation

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