OLED Functional Layer Thickness Layout for Leakage Current Control
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Solution Overview
Problem
In electronic devices with organic light emitting elements, leakage current through organic layers between adjacent light emitting elements leads to unintentional emission, narrowing the color gamut and generating noise in photoelectric conversion elements.
Innovation Solution
The electronic device incorporates a first and second lower electrode, an upper electrode, a functional layer covering the lower electrodes, and an insulating layer with a slope portion, where the functional layer has a smaller thickness on the second region and a thickness of 20 nm or more on the slope portion of the insulating layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the organic layer is formed as a thin layer to reduce leakage current between lower electrodes, then leakage current between lower electrodes is reduced, but leakage current between upper electrode and lower electrode increases
Solution Approach 1:
The patent applies local quality by creating different thickness regions within the organic layer. Specifically, the organic layer has a first thickness in the pixel central area and a second thickness (greater than the first) in the pixel peripheral area near the rib. This local variation in thickness allows the patent to reduce leakage current between lower electrodes in the central area while preventing short circuits between upper and lower electrodes in the peripheral area near the rib.
2Reliability
If the organic layer thickness is increased to prevent short circuit between upper and lower electrodes, then short circuit is reduced, but leakage current between adjacent light emitting elements increases
Solution Approach 1:
The patent uses local quality by specifying that the organic layer thickness varies locally across different regions. The first thickness in the pixel central area is optimized to prevent leakage current between adjacent light emitting elements, while the second thickness (greater than the first) in the pixel peripheral area near the rib is optimized to prevent short circuits between upper and lower electrodes. This localized thickness control resolves the contradiction by addressing each region's specific requirements.
Data Source
AI summary
The present disclosure provides an electronic device including a plurality of first electrodes, a second electrode, a functional layer disposed between each first electrode and the second electrode, and an insulating layer having a slope portion on the first electrode, wherein the functional layer is continuously disposed so as to cover the first electrode, a neighboring first electrode, and the insulating layer covering the first electrode and the neighboring first electrode, the functional layer on the first electrode has a layer thickness smaller than a height from an upper surface of the first electrode to an upper surface of the insulating layer, and the functional layer on the slope portion of the insulating layer has a layer thickness of 20 nm or more in a direction perpendicular to a slope surface of the slope portion.