Polarized light-emitting backlight unit using a retardation film for improving light efficiency in a twisted nematic mode liquid crystal module

Jeongmin Moon, Sungrae Lee, Sejin Lee, Woohyun Jung, Kyunghwan Oh

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We propose and demonstrate a new polarized backlight unit (BLU) configuration to enhance light transmission in a twisted nematic (TN) mode liquid crystal (LC) panel. By adding an optimized phase retardation film (PRF) to the BLU, we efficiently controlled the polarization state of the light from the light guide plate (LGP), enabling it to be aligned along the transmission axis of the bottom polarizer of the LC panel. We designed and fabricated a 7 in. edge-lit BLU with a PRF. To obtain a uniform positional distribution in both light intensity and degree of polarization (DOP), the LGP was optimized with linear groove patterns. To maximize BLU light transmission through the bottom polarizer in a TN-mode LC panel, the slow axis of the PRF was aligned at 22.5° with respect to the LED array axis. We improved the transmittance from 45 to 72%.

Original languageEnglish
Article number042501
JournalJapanese Journal of Applied Physics
Volume53
Issue number4
DOIs
Publication statusPublished - 2014 Jan 1

Fingerprint

Light polarization
Liquid crystals
polarized light
light transmission
modules
liquid crystals
polarizers
Light transmission
polarization
Polarization
grooves
luminous intensity
transmittance
light emitting diodes
Light emitting diodes
configurations

All Science Journal Classification (ASJC) codes

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

Cite this

@article{60df93d77e824bcc84d4d08fad4acb69,
title = "Polarized light-emitting backlight unit using a retardation film for improving light efficiency in a twisted nematic mode liquid crystal module",
abstract = "We propose and demonstrate a new polarized backlight unit (BLU) configuration to enhance light transmission in a twisted nematic (TN) mode liquid crystal (LC) panel. By adding an optimized phase retardation film (PRF) to the BLU, we efficiently controlled the polarization state of the light from the light guide plate (LGP), enabling it to be aligned along the transmission axis of the bottom polarizer of the LC panel. We designed and fabricated a 7 in. edge-lit BLU with a PRF. To obtain a uniform positional distribution in both light intensity and degree of polarization (DOP), the LGP was optimized with linear groove patterns. To maximize BLU light transmission through the bottom polarizer in a TN-mode LC panel, the slow axis of the PRF was aligned at 22.5° with respect to the LED array axis. We improved the transmittance from 45 to 72{\%}.",
author = "Jeongmin Moon and Sungrae Lee and Sejin Lee and Woohyun Jung and Kyunghwan Oh",
year = "2014",
month = "1",
day = "1",
doi = "10.7567/JJAP.53.042501",
language = "English",
volume = "53",
journal = "Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes",
issn = "0021-4922",
publisher = "Japan Society of Applied Physics",
number = "4",

}

Polarized light-emitting backlight unit using a retardation film for improving light efficiency in a twisted nematic mode liquid crystal module. / Moon, Jeongmin; Lee, Sungrae; Lee, Sejin; Jung, Woohyun; Oh, Kyunghwan.

In: Japanese Journal of Applied Physics, Vol. 53, No. 4, 042501, 01.01.2014.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Polarized light-emitting backlight unit using a retardation film for improving light efficiency in a twisted nematic mode liquid crystal module

AU - Moon, Jeongmin

AU - Lee, Sungrae

AU - Lee, Sejin

AU - Jung, Woohyun

AU - Oh, Kyunghwan

PY - 2014/1/1

Y1 - 2014/1/1

N2 - We propose and demonstrate a new polarized backlight unit (BLU) configuration to enhance light transmission in a twisted nematic (TN) mode liquid crystal (LC) panel. By adding an optimized phase retardation film (PRF) to the BLU, we efficiently controlled the polarization state of the light from the light guide plate (LGP), enabling it to be aligned along the transmission axis of the bottom polarizer of the LC panel. We designed and fabricated a 7 in. edge-lit BLU with a PRF. To obtain a uniform positional distribution in both light intensity and degree of polarization (DOP), the LGP was optimized with linear groove patterns. To maximize BLU light transmission through the bottom polarizer in a TN-mode LC panel, the slow axis of the PRF was aligned at 22.5° with respect to the LED array axis. We improved the transmittance from 45 to 72%.

AB - We propose and demonstrate a new polarized backlight unit (BLU) configuration to enhance light transmission in a twisted nematic (TN) mode liquid crystal (LC) panel. By adding an optimized phase retardation film (PRF) to the BLU, we efficiently controlled the polarization state of the light from the light guide plate (LGP), enabling it to be aligned along the transmission axis of the bottom polarizer of the LC panel. We designed and fabricated a 7 in. edge-lit BLU with a PRF. To obtain a uniform positional distribution in both light intensity and degree of polarization (DOP), the LGP was optimized with linear groove patterns. To maximize BLU light transmission through the bottom polarizer in a TN-mode LC panel, the slow axis of the PRF was aligned at 22.5° with respect to the LED array axis. We improved the transmittance from 45 to 72%.

UR - http://www.scopus.com/inward/record.url?scp=84903179211&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84903179211&partnerID=8YFLogxK

U2 - 10.7567/JJAP.53.042501

DO - 10.7567/JJAP.53.042501

M3 - Article

VL - 53

JO - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes

JF - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes

SN - 0021-4922

IS - 4

M1 - 042501

ER -