Conductive Bank Layer Structure for Uniform OLED Luminance
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Solution Overview
Problem
Display apparatuses experience a luminance difference between the edge and center of the display area, which affects image quality.
Innovation Solution
The display apparatus incorporates a pixel electrode with a stacked structure including an inorganic bank layer and a conductive bank layer, featuring a first metal layer with a protruding tip and a cover layer with higher Young's modulus, along with an opposite electrode directly contacting the side surface of the first metal layer, and additional layers to enhance structural integrity and luminance uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional bank layer structure is used, then the device complexity is low, but luminance uniformity deteriorates with differences between edge and center
Solution Approach 1:
The bank layer is segmented into multiple functional layers: an inorganic bank layer for structural support and insulation, and a conductive bank layer with specific multi-layer structure (first metal layer, second metal layer with protruding tip, and cover layer) for electrical conduction. This segmentation allows each layer to perform its specific function optimally, resolving the contradiction between structural simplicity and luminance uniformity.
Solution Approach 2:
The conductive bank layer employs local quality variations through its multi-layer structure where the second metal layer has a protruding tip at specific locations. This localized structural feature ensures proper electrical contact with the pixel electrode at critical points while maintaining insulation elsewhere, thereby achieving uniform luminance without excessive overall complexity.
2Stability of the object's composition
If the cover layer has high Young's modulus, then mechanical stability improves, but contact resistance may increase
Solution Approach 1:
The cover layer is designed with local quality variations - it covers most of the second metal layer to provide mechanical stability and insulation, but intentionally leaves the protruding tip exposed. This localized design ensures low contact resistance at the critical contact point while maintaining overall mechanical stability through the covered portions.
Solution Approach 2:
The conductive bank layer uses a composite multi-layer structure combining different materials with complementary properties: the first metal layer provides base conductivity, the second metal layer with protruding tip ensures low contact resistance, and the cover layer provides mechanical stability and insulation. This composite approach resolves the contradiction between mechanical stability and contact resistance.
Data Source
AI summary
A display apparatus comprises a pixel electrode, a bank layer including an inorganic bank layer and a conductive bank layer that are sequentially stacked, and that define a pixel opening overlapping the pixel electrode, an intermediate layer above the pixel electrode and in the pixel opening, and an opposite electrode above the intermediate layer, wherein the conductive bank layer includes a first metal layer, a second metal layer having a tip protruding from the first metal layer toward a center of the pixel opening, and a cover layer covering the second metal layer.