Electroluminescent device

摘要

An electroluminescent device ( 13 ), such as a light emitting diode, which has a light-reflecting surface ( 10 ) causing undesirable reflection of ambient light incident on the device is provided with a combination of a reflective circular polarizer ( 17 ) and an absorbing circular polarizer ( 23 ) to suppress the undesirable reflection of ambient light thus improving the contrast of the device when used under high intensity ambient lighting conditions while maintaining a satisfactory brightness. The reflection band of the reflective circular polarizer regions ( 17 ') of the reflective circular polarizer ( 17 ) are preferably tuned to the corresponding emission band of the luminescent regions ( 9 ') of the electroluminescent device to further increase the contrast of the device while substantially maintaining the same brightness.