Organic Device Third Electrode Insulating Recess Current Leakage
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Solution Overview
Problem
In organic devices using a white+CF system, driving current leaks between adjacent light emitting elements due to a common organic layer, leading to crosstalk and decreased efficiency, particularly in low-luminance regions and color mixture issues.
Innovation Solution
An organic device with a substrate and light emitting elements featuring a third electrode between adjacent elements, covered by an insulating layer with a recess, which increases the organic layer's resistance and suppresses current leakage by forming a potential line between inter-element electrodes, thereby enhancing hole recombination and reducing color gamut degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a common organic layer is formed on the entire substrate surface in the white+CF system, then resolution can be increased by adjusting pixel size and pitch, but driving current leaks between adjacent light emitting elements causing crosstalk and color mixture
Solution Approach 1:
The patent divides the continuous organic layer into separate regions by introducing a third electrode structure with insulating layers that physically segment the organic layer between adjacent light emitting elements. This segmentation prevents current leakage while maintaining the white+CF system architecture, resolving the contradiction between achieving high resolution through continuous organic layer formation and preventing current leakage between elements.
2Object-generated harmful factors
If a metal interconnection surrounding the anode electrode is formed to collect leaked current, then current leakage can be collected, but in low-luminance regions the resistance between anode and metal interconnection becomes lower than organic layer resistance causing uncontrollable luminance
Solution Approach 1:
The patent introduces an insulating layer as an intermediary between the third electrode and the organic layer, preventing direct electrical contact. This intermediary structure allows the third electrode to influence the electric field and suppress current leakage without creating a low-resistance path that would compromise luminance control, thus resolving the contradiction between current leakage collection and luminance control.
3Object-generated harmful factors
If an electrode covered with insulating layer is formed between light emitting elements to generate electric field for suppressing leak, then current leakage can be suppressed, but suppression becomes insufficient causing color mixture
Solution Approach 1:
The patent applies local quality by creating a recess portion in the insulating layer at specific locations between adjacent light emitting elements. This localized structural modification concentrates the electric field in critical regions where current leakage occurs, enhancing the effectiveness of leak suppression without requiring extensive modifications to the overall structure, thus resolving the contradiction between leak suppression and preventing color mixture.
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
Effectively suppresses driving current leaks between light emitting elements, improving luminance control and color accuracy by increasing the organic layer's resistance and hole recombination probability, thus maintaining high image quality and color fidelity.
Implementation Method 1
the insulating layer includes a recess between the first electrode and the third electrode
Implementation Method 2
an end portion of the first electrode, and an end portion of the third electrode, and the insulating layer includes a recess between the first electrode and the third electrode
Data Source
AI summary
An organic device is provided. The device comprises a substrate and a plurality of light emitting elements formed on a first surface of the substrate. Each of the plurality of light emitting elements includes, from a side of the first surface, a first electrode, an organic layer formed on the first electrode and including a light emitting layer, and a second electrode formed on the organic layer. The organic device further comprises a third electrode formed between the first electrodes of adjacent light emitting elements of the plurality of light emitting elements, and an insulating layer covering a portion between the first electrode and the third electrode, an end portion of the first electrode, and an end portion of the third electrode. The insulating layer includes a recess between the first electrode and the third electrode.