Mixed Organic Layer for Leak Current Suppression in OLEDs
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Solution Overview
Problem
In electronic devices with organic light emitting elements, leak currents between adjacent elements cause unintended light emission, narrowing the color gamut and affecting display performance, and thinner organic layers reduce leak current between elements but increase leak current between electrodes.
Innovation Solution
An electronic device with a mixed organic compound layer containing a first and second organic material, where the second material has lower hole mobility than the first, and an insulating layer with inclined surfaces, the ratio of the second material to the first is higher on inclined surfaces than on flat surfaces, reducing hole mobility and leak current between elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a continuous organic layer is used to enable partial light emission, then light emission control is improved, but unintended light emission occurs due to leak current
Solution Approach 1:
The patent applies local quality by positioning the first organic layer with smaller thickness specifically in regions where leak current suppression is needed (between adjacent light emitting elements), while maintaining the second organic layer with larger thickness in regions where light emission is desired. This allows the continuous organic layer structure to provide both light emission control and leak current suppression by having different thickness characteristics in different locations
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively suppresses leak current between adjacent light emitting elements while maintaining adequate hole mobility on flat surfaces, reducing the need for thinner organic layers and minimizing unintended light emission.
Implementation Method 1
the mixed layer contains a first organic material and a second organic material having a hole mobility lower than a hole mobility of the first organic material
Data Source
AI summary
Electronic device includes lower electrodes, insulating layer covering end portion of each lower electrode, organic compound layer covering the insulating layer and electrode region of upper surface of each lower electrode, and upper electrode covering the organic compound layer. The electrode region of the upper surface is located on inner side of the end portion The organic compound layer includes mixed layer containing first organic material and second organic material having hole mobility lower than that of the first organic material. The insulating layer includes inclined surface inclined with respect to the upper surface of the lower electrode. Ratio of weight of the second organic material to weight of the first organic material is higher in second portion of the mixed layer on the inclined surface than in first portion of the mixed layer on the electrode region.