OLED Pixel Electrode Insulation for Current Leakage Suppression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display devices with an organic layer common to all pixels face issues with drive current leakage between adjacent light emitting elements, which affect luminous efficiency and color stability.
Innovation Solution
Incorporating a silicon compound-based insulating layer with a silicon oxide interface layer and a uniform organic layer thickness to suppress drive current leakage, using a configuration of first electrodes for each pixel, an insulating layer, a silicon oxide interface layer, and a common organic layer with a constant thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If an organic layer common to all pixels is used, then device complexity is reduced and manufacturing is simplified, but drive current leakage occurs between adjacent light emitting elements
Solution Approach 1:
The patent divides the common organic layer into multiple independent regions by forming insulating barriers (silicon oxide interface layer and insulating layer) between adjacent pixels. These barriers segment the continuous organic layer, preventing drive current from leaking between adjacent light emitting elements while maintaining the simplified common organic layer structure for manufacturing efficiency.
2Reliability
If insulating films are added to suppress current leakage, then current leakage is reduced, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent introduces a silicon oxide interface layer as an intermediary barrier between the first electrode and the common organic layer. This intermediate layer specifically at the interface region provides effective current leakage suppression without requiring complete insulation throughout the entire organic layer structure, thus balancing reliability improvement with manageable device complexity.
Solution Approach 2:
The patent applies insulating properties locally at critical interfaces (using silicon oxide interface layer at the electrode-organic layer interface and insulating layer in inter-element regions) rather than throughout the entire device. This localized approach provides effective current leakage suppression at problem areas while maintaining the overall simplicity of the common organic layer structure for manufacturing.
3Reliability
If insulating layers are added to suppress current leakage, then current leakage is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies particular material compositions (silicon oxide for interface layer, silicon compound for insulating layer) and controlled thickness ranges for each layer. By defining specific material parameters and thickness parameters, the patent achieves reliable current leakage suppression through material selection and dimensional control rather than requiring extremely precise fabrication processes, thus balancing reliability with manufacturing feasibility.
Data Source
AI summary
A display device includes a plurality of first electrodes each provided for each pixel, an insulating layer containing a silicon compound, provided between the first electrodes, and covering a peripheral edge portion of the first electrode, a first interface layer containing a first silicon oxide and provided at an interface between the first electrode and the insulating layer, an organic layer including a light emitting layer, and provided on the first electrodes and the insulating layer, commonly to all of pixels, and a second electrode provided on the organic layer. The insulating layer contains a second silicon oxide on a surface portion on a side of the organic layer.