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Organic light-emitting diode (OLED) is a promising technology that presents many important features to improve the efficiency of lighting and screen applications. The automotive lighting application requirements are prompting lots of research related to this solid-state light source. The aim of this study is to understand the OLED technology and discuss its main characteristics, such as luminance, efficiency, lifetime, emitting color, and organic materials. Also, to investigate the opportunities and requirements to be applied in vehicle exterior lighting.

The microcellular foam injection molding process is being widely applied by the thermoplastics industry. This process consists in a melted polymer injection mixed with a processing solvent, that is an inert gas in the supercritical state, usually CO2 or N2 producing a microcellular foam. This technique offers many advantages such as weight reduction, dimensional uniformization and less warpage. Besides that, it offers a satisfactory property like acoustic and thermal insulation. On the other hand, the parts from this process have an inferior mechanical property like ductility and toughness if compared with solid injection molded parts. Nevertheless, the main issue for this process is the poor appearance quality. This paper presents a review of some existing methods for surface quality improvement as Co-injection process, where a skin is injected over the microcellular part, and Heat & Cool that consists in a control of mold temperature.