Light Emitting Device - PDF

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Description: BACKGROUND 1. Technical Field The present invention relates to a light emitting device using an organic electroluminescence element as a light emitting element. 2. Related Art Recently, as a light emitting device that is used in a display screen of a cellular phone, a personal computer, or the like, an organic EL device that forms an image by regularly arranging organic electroluminescence (hereinafter, referred to asorganic EL) elements as light emitting elements on a display surface that is a surface on a side for outputting light has been considered. Each light emitting element has a function layer that includes at least a light emitting layer (organic EL layer) between an anode and a cathode that are formed to face each other, and light is emitted by a current flowing between the anode andthe cathode. The organic EL device forms an image by outputting the emitted light from the display surface. In addition, a configuration in which a reflective layer is disposed on a side opposite to the display surface and the emitted light iseffectively used by reflecting light to the display surface side is generally used. To the above-described configuration, a configuration in which an electrode located on the display surface side is formed of a material having semi-transmissivereflectivity and light in a target wavelength range is enhanced and output by forming a microcavity structure between the reflective layer and the electrode is frequently added. In the organic EL device having such a configuration, reflection of external light may be a problem. Since the reflective layer reflects not only the emitted light but also external light incident from the display surface, the reflectedexternal light is mixed in the emitted light in a bright place, and thereby contrast may be degraded. As means for decreasing reflection of external light, a configuration in which a circular polarizing plate is bonded to the display surface side has been proposed (see JP-A-9-127885). Un
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