National Taiwan University

Yi-Jiun Chen

Chung-Chih Wu

Wei-Kai Lee

Hoang Yan Lin

Chien-Yu Chen

Guo-Dong Su

The present invention discloses a general, highly effective and scalable extraction-enhancing OLED display pixel structure based on embedding the OLED inside a three-dimensional reflective concave structure selectively filled with a high-index filler material. Such a structure is able to couple as much as possible internally generated photons into the filler region and then redirect otherwise confined light for out-coupling via the reflective concave structure. Ultimately high light extraction efficiency approaching &#x2dc;80% and excellent viewing characteristics are simultaneously achievable with optimized structures using highly transparent top electrodes. This scheme is scalable and wavelength insensitive, and thus can be generally applied to all red, green, and blue pixel OLEDs in high-resolution full-color displays.

Electroluminescent device and display pixel structure using the same

An electroluminescent (EL) device is disclosed, comprising a nanostructured composite electrode, one or more functional layers and an top electrode. The nanostructured composite electrode is consisting essentially of a first layer having a nanostructure and a second layer disposed on the nanostructure. The first and second layers are transparent and conducting, and one of the refractive-indexes of the first and second layers is lower than or equal to 1.65, and the other of the refractive-indexes of the first and second layers is higher than or equal to 1.75. One or more functional layers including a light emitting layer is disposed on the second layer. The top electrode is disposed on the functional layers. Especially, each of feature pits and each of intervals between the feature pits of the nanostructure of the first layer is smaller than or equal to a major wavelength of light emitted from the light emitting layer.

Growing community of inventors

Taipei, Taiwan

Yi-Jiun Chen