Suppression of viewing angle dependence of organic light emitting diodes by introduction of circular polarizer with nanoporous polymer film

Nam Su Kim, Woo Young Lee, Beom Pyo, Min Chul Suh

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

To improve poor viewing angle characteristics of top emission organic light emitting diodes (TEOLEDs) without any serious pixel blur phenomena, we applied a circular polarizer (CP) film modified by nanoporous polymer film (NPF). From this approach, we could improve the color shift significantly (Δu'v’ in CIE 1976 with viewing angle, from 0.0165 to 0.0114), and expand angular light emission distribution of off-axis by applying CP with NPF. We found that black color shift was little associated with NPF position change although black color was slightly faded tint by applying NPF, as like plasma display panel(PDP)’s off condition. Very interestingly, we found that the reflectance was not changed seriously whether NPF exists between glass encapsulation and CP or not. Besides, we investigated the pixel blur level when we applied different condition in encapsulation thickness and morphology of diffusing films. As a result, we found that the pixel blur phenomena can be significantly suppressed by applying thin encapsulation and NPF type diffuser film.

Original languageEnglish
Pages (from-to)232-237
Number of pages6
JournalOrganic Electronics
Volume44
DOIs
Publication statusPublished - 1 May 2017

Bibliographical note

Publisher Copyright:
© 2017 Elsevier B.V.

Keywords

  • Circular polarizer
  • Nanoporous polymer film
  • Pixel blur
  • TEOLED
  • Viewing angle dependence

Fingerprint

Dive into the research topics of 'Suppression of viewing angle dependence of organic light emitting diodes by introduction of circular polarizer with nanoporous polymer film'. Together they form a unique fingerprint.

Cite this