OLED Passivation Structure for Sub-Pixel Crosstalk Isolation
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Solution Overview
Problem
Silicon-based OLED displays suffer from crosstalk between sub-pixels due to the low resistivity of the hole injection layer, which affects display quality.
Innovation Solution
An organic electroluminescent structure is designed with a passivation protective layer featuring inner cutting portions that partition the hole injection layer into independent blocks, preventing conduction between sub-pixels, and includes a metal composite layer for improved light reflection and a driving circuit for enhanced display performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a common hole injection layer with low resistivity is used for the entire display, then the ease of manufacture is improved, but crosstalk between sub-pixels occurs due to conduction through the layer
Solution Approach 1:
The patent divides the common hole injection layer into separate hole injection blocks corresponding to each sub-pixel by forming inner cutting portions in the passivation protective layer. This segmentation prevents lateral conduction between sub-pixels while maintaining the ease of manufacturing a common layer structure, as the layer itself remains continuous but is electrically isolated by the cutting portions extending through the passivation layer.
2Object-affected harmful factors
If the hole injection layer is segmented into separate blocks for each sub-pixel, then crosstalk is reduced, but the device complexity increases
Solution Approach 1:
The patent introduces inner cutting portions formed in the passivation protective layer as an intermediary structure to achieve electrical isolation between hole injection blocks. This approach avoids the need for complex additional isolation layers or structures, as the cutting portions through the existing passivation layer serve as effective barriers to lateral conduction while maintaining structural simplicity.
Solution Approach 2:
The passivation protective layer serves multiple functions: it provides electrical isolation between sub-pixels when inner cutting portions are formed, protects underlying layers, and facilitates the formation of separate hole injection blocks. This multi-functionality reduces the need for additional dedicated isolation structures, thereby limiting the increase in device complexity.
3Object-affected harmful factors
If additional process steps or photomasks are introduced to prevent crosstalk, then crosstalk reduction is achieved, but the ease of manufacture decreases
Solution Approach 1:
The patent combines the formation of inner cutting portions in the passivation protective layer with the existing manufacturing process flow, integrating the crosstalk prevention function into the standard fabrication steps. This merging approach allows the isolation structure to be formed using conventional processes without requiring additional photomasks or separate process modules, thereby maintaining ease of manufacture.
Data Source
AI summary
This disclosure relates to an organic electroluminescent structure and a display device. The organic electroluminescent structure includes a base substrate; a passivation protective layer provided at a side of the base substrate, in which the passivation protective layer is provided with a plurality of inner cutting portions arranged at intervals at a side facing away from the base substrate, each of the inner cutting portions has a first surface towards the base substrate and a second surface away from the base substrate, an orthographic projection of the first surface on the base substrate is within an orthographic projection of the second surface on the base substrate, and a groove is provided between two adjacent inner cutting portions and is formed as an inner cutting structure; an anode layer including a plurality of anodes arranged at intervals; an organic light-emitting functional layer having a hole injection layer.