Polarized backlight unit using a polarization-preserving light-redirecting film for improving luminance gain

Jeongmin Moon, Sungrae Lee, Kyunghwan Oh

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We proposed and demonstrated a polarized backlight unit (BLU) configuration with a new light-redirecting film (LRF) to improve the luminance gain and light transmittance in liquid crystal displays. We combined a very low birefringence triacetyl cellulose (TAC) base layer with UV-cured prismatic patterns in a mass-producible process to demonstrate a polarization-preserving LRF. Detailed analyses of the states of polarization (SOP) through the LRF were reported. We also fabricated a 7-in. edge-lit BLU using the new LRF. We found that the light directing capability of the new LRF was equivalent to that of a conventional prism film whose base layer was a poly(ethylene terephthalate) (PET) film, and that the new LRF successfully suppressed random polarization changes of the transmitted light. Utilizing these new advantages, we obtained 68% transmittance through the polarizer over the BLU with the new LRF, which was about 1.3-fold that for the BLU with the conventional prism film (54%). We also obtained 127% luminance gain using the new LRF, which was equivalent to that of the conventional prism film. Here, the luminance gain is referred to as the amount of increase in luminance on the surface normal of the light-guiding plate without any film.

Original languageEnglish
Article number052202
JournalJapanese Journal of Applied Physics
Volume54
Issue number5
DOIs
Publication statusPublished - 2015 Jan 1

Fingerprint

Light polarization
luminance
preserving
Luminance
polarization
Prisms
prisms
transmittance
Polarization
polyethylene terephthalate
Birefringence
polarizers
Liquid crystal displays
cellulose
Polyethylene terephthalates
birefringence
Cellulose
liquid crystals

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

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abstract = "We proposed and demonstrated a polarized backlight unit (BLU) configuration with a new light-redirecting film (LRF) to improve the luminance gain and light transmittance in liquid crystal displays. We combined a very low birefringence triacetyl cellulose (TAC) base layer with UV-cured prismatic patterns in a mass-producible process to demonstrate a polarization-preserving LRF. Detailed analyses of the states of polarization (SOP) through the LRF were reported. We also fabricated a 7-in. edge-lit BLU using the new LRF. We found that the light directing capability of the new LRF was equivalent to that of a conventional prism film whose base layer was a poly(ethylene terephthalate) (PET) film, and that the new LRF successfully suppressed random polarization changes of the transmitted light. Utilizing these new advantages, we obtained 68{\%} transmittance through the polarizer over the BLU with the new LRF, which was about 1.3-fold that for the BLU with the conventional prism film (54{\%}). We also obtained 127{\%} luminance gain using the new LRF, which was equivalent to that of the conventional prism film. Here, the luminance gain is referred to as the amount of increase in luminance on the surface normal of the light-guiding plate without any film.",
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Polarized backlight unit using a polarization-preserving light-redirecting film for improving luminance gain. / Moon, Jeongmin; Lee, Sungrae; Oh, Kyunghwan.

In: Japanese Journal of Applied Physics, Vol. 54, No. 5, 052202, 01.01.2015.

Research output: Contribution to journalArticle

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