Organic electroluminescence cell, planar light source and display device

Abstract

An organic electroluminescence cell including at least one organic layer and a pair of electrodes, the organic layer including a light-emitting layer and sandwiched between the pair of electrodes, the pair of electrodes including a reflective electrode and a transparent electrode, the organic electroluminescence cell formed to satisfy the expression; Btheta in which B0 is a frontal luminance value of luminescence radiated from a light extraction surface to an observer, and Btheta is a luminance value of the luminescence at an angle of from 50 DEG to 70 DEG , wherein a reflection / refraction angle disturbance region is provided so that the angle of reflection / refraction of the luminescence is disturbed while the luminescence is output from the light-emitting layer to the observer side through the transparent electrode.

Description

This application is based on Japanese Patent Application Nos. 2002-341821, 2003-000080, 2003-062554 and 2003-280576, which are incorporated herein by reference. technical field The present invention relates to an organic electroluminescence unit, which has excellent luminous efficiency, especially the efficiency of extracting light out, relates to a high-efficiency (polarized) planar light source using the organic electroluminescence unit, and a planar light source with the planar light source (liquid crystal) display device. Background technique An electroluminescent cell or a light emitting diode in which a light emitting layer is provided between electrodes to obtain electroluminescence has been actively researched and developed not only for use in display devices but also for use in various light sources such as planar light emitters , Optical fiber light source, backlight unit for liquid crystal display, backlight unit for liquid crystal projector. In particular, an...

AI Technical Summary

Problems solved by technology

A scheme has never been proposed to produce the maximum luminous efficiency, for example, through the combination of an organic electroluminescent cell and a reflective circular polarizing element, assuming that the interference of the light guiding in the organic electroluminescent cell with the distance between the light emitting area and the reflective electrode The relationship between the effects of the

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