Subpixel Electrode Layout to Block Lateral Leakage in Displays
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Solution Overview
Problem
The reduction of gaps between subpixels in display devices leads to lateral leakage currents, causing undesirable emissions and device deterioration.
Innovation Solution
A display device design featuring a substrate with subpixels surrounded by a bank layer and an auxiliary electrode with an undercut shape, connecting adjacent second electrodes to prevent lateral leakage currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the gap between subpixels is reduced to achieve high resolution, then the display resolution is improved, but lateral leakage current between adjacent subpixels is generated causing device deterioration
Solution Approach 1:
An auxiliary electrode is introduced as an intermediary component between adjacent subpixels. This auxiliary electrode serves as a mediator to electrically connect the second electrodes of adjacent subpixels, providing a controlled current path that prevents uncontrolled lateral leakage current while maintaining high resolution display performance
Solution Approach 2:
The bank layer is designed with an undercut shape that segments the organic layer between adjacent subpixels. This segmentation creates distinct regions that control the flow of current, allowing the auxiliary electrode to connect subpixels electrically while preventing lateral leakage current through the organic layer
2Area of stationary object
If the gap between subpixels is reduced to improve aperture ratio, then the aperture ratio is improved, but lateral leakage current causes undesirable emission and device deterioration
Solution Approach 1:
The auxiliary electrode acts as an intermediary that provides a controlled electrical connection between subpixels, replacing the uncontrolled lateral leakage current path through the organic layer with a controlled current path through the auxiliary electrode, thereby eliminating harmful lateral leakage while maintaining high aperture ratio
Solution Approach 2:
The bank layer is designed with different shapes in different regions: an undercut shape at the boundaries between subpixels to segment the organic layer and prevent lateral leakage, while maintaining continuity in the pixel emission regions to preserve aperture ratio and light emission quality
Data Source
AI summary
A display device includes: a substrate having a plurality of subpixels; a transistor in each of the plurality of subpixels; a first bank layer surrounding the plurality of subpixels; an auxiliary electrode on the first bank layer; a light emitting diode in each of the plurality of subpixels, the light emitting diode including a first electrode, an emitting layer on the first electrode and a second electrode on the emitting layer; and a first encapsulating layer on the light emitting diode in each of the plurality of subpixels, wherein the auxiliary electrode and the first bank layer have an undercut shape, and wherein the second electrode contacts the auxiliary electrode such that the second electrodes of adjacent two of the plurality of subpixels are electrically connected to each other.