OLED Passivation Layout for Isolated Hole Injection Blocks
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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 a fabrication method that forms these blocks without additional processing or photomasks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a common hole injection layer with low resistivity is used across the entire display, then good hole injection performance is achieved, but crosstalk occurs between adjacent sub-pixels
Solution Approach 1:
The hole injection layer is segmented into isolated hole injection blocks corresponding to each sub-pixel, separated by insulating layers. This segmentation prevents lateral charge carrier transport between adjacent sub-pixels, eliminating crosstalk while maintaining effective hole injection within each sub-pixel region through the low-resistivity material itself
2Object-affected harmful factors
If the hole injection layer is divided into separate blocks for each sub-pixel, then crosstalk is prevented, but additional processing steps and photomasks are required
Solution Approach 1:
The insulating layer is formed beforehand with pre-defined openings that precisely define the locations and dimensions of the future hole injection blocks. This preliminary structuring allows subsequent hole injection material deposition to automatically form the correct pattern without requiring additional photomask alignment steps, thereby preventing crosstalk while avoiding increased fabrication complexity
Data Source
AI summary
This disclosure relates to an organic electroluminescent structure, a fabrication method thereof, and a display device. The organic electroluminescent structure includes a base substrate; a passivation protective layer formed at a side of the base substrate, in which the passivation protective layer is formed with a plurality of inner cutting portions arranged at intervals at a side facing away from the base substrate; an anode layer including a plurality of anodes arranged at intervals, and each of the anodes is correspondingly formed on the second surface; an organic light-emitting functional layer having a hole injection layer, in which the hole injection layer includes a plurality of hole injection blocks arranged at intervals, and each of the hole injection blocks is correspondingly formed on one anode; and a cathode layer formed at a side of the organic light-emitting functional layer facing away from the anode layer.