Samenvatting
For most applications of displays based on org. light-emitting diodes (LEDs), it is desirable to have good daylight contrast in combination with a high intensity of emitted light. The conventional approaches to enhance the daylight contrast, using a black cathode or circular polarizers, result in a significant loss of light emitted by the LED. A rather novel approach to enhance daylight contrast while keeping loss of emitted light to a min. is the introduction of a chiral-nematic film in the device. This approach leads to an increase in light efficiency by a factor of 1.8 (with respect to circular polarizers) with some loss in daylight contrast values within the reflection band of the chiral-nematic film. Outside the reflection band, however, the contrast approaches infinity
Originele taal-2 | Engels |
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Pagina's (van-tot) | 138-142 |
Aantal pagina's | 5 |
Tijdschrift | Advanced Functional Materials |
Volume | 15 |
Nummer van het tijdschrift | 1 |
DOI's | |
Status | Gepubliceerd - 2005 |