Abstract
We have developed 2.2-inch diagonal (132 x RGB x 162 dots) Color Passive-matrix Organic Electroluminescent (OEL) Displays through the use of patterned lateral RGB emitters, and have started the pilot production. The devices have achieved practical level in their performance. The organic electroluminescent layers and the metal cathodes have been fabricated using metal shadow (slits) masks. Further examination of the panel fabrication process and the organic materials has been made, and the results have been applied to the display devices. The organic electroluminescent device structure of the display panel is a four-layer stack consisting of a hole injection layer, a hole transport layer, an emitting layer, and an electron transport layer. The display pixel consists of three-color elements, which are green, red, and blue. These three emitting materials, the hole injection layer and the electron transport material have been newly developed. The display panel has been encapsulated by a stainless steel cap and driven by the dual-scan method. That display is thin (2.5mm, the driver circuit included) and light (10g, the driver circuit included), and has a wide range of viewing angles. That is proven to be practical for commercial purposes.
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