Pixel structure in an electroluminescent display device

Abstract

An electroluminescent device (200) for use, e.g., in a colour matrix display unit is presented. Picture elements comprise a plurality of electroluminescent sub-pixels (201,202,203) capable of emitting light when subject to electric current. The sub-pixels each have a degradation lifetime and an emissive area (211,212,213) and, for any pair of first and second sub-pixels in a picture element, the ratio between the first sub-pixel emissive area and the second sub-pixel emissive area is inversely proportional to the ratio between the degradation lifetime of said first sub-pixel and the degradation lifetime of the second sub-pixel.

Description

technical field [0001] The present invention relates to a device comprising at least one picture element comprising a plurality of electroluminescent sub-pixels. Background technique [0002] Since the discovery in the early 1990s, there have been many research and development results in light-emitting devices utilizing electroluminescent materials, organic materials such as polymers, and inorganic materials. Products including such devices are now becoming commonly available. Examples of such products include mobile communication terminals, PDAs, etc., which are equipped with monochrome or color matrix display devices. [0003] The main advances that have been made in the development of electroluminescent devices have been in the area of ​​reduction in driving voltage and increased efficiency of conversion from electrical energy input to light energy emitted from the device. [0004] In a typical color matrix display device with electroluminescent light emitting diodes, e...

AI Technical Summary

Problems solved by technology

In fact, the sub-pixel comprising the electroluminescent material with the shortest decomposition time scale thus controls the lifetime of the display

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