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 language | English |
---|---|
Pages (from-to) | 232-237 |
Number of pages | 6 |
Journal | Organic Electronics |
Volume | 44 |
DOIs | |
Publication status | Published - 1 May 2017 |
Bibliographical note
Publisher Copyright:© 2017 Elsevier B.V.
Keywords
- Circular polarizer
- Nanoporous polymer film
- Pixel blur
- TEOLED
- Viewing angle dependence