Segmented Stripe Electrodes for OLED Voltage Drop Mitigation
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Solution Overview
Problem
Conventional organic light-emitting display apparatuses suffer from image quality deterioration due to voltage drops caused by a single, body-formed opposite electrode with non-zero resistance, leading to varying voltages across different pixels or sub-pixels, resulting in inconsistent light emission.
Innovation Solution
The apparatus features a substrate with multiple stripe-shaped second electrodes and connection wiring, where the second electrodes have varying thicknesses and '+'' shaped portions, and the connection wiring is formed using a mask with specific opening patterns to ensure uniform voltage application across electrodes, preventing voltage drops and improving image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single body-formed opposite electrode is used, then the device structure is simple, but voltage drops occur causing image quality deterioration
Solution Approach 1:
The single body-formed opposite electrode is divided into multiple separate stripe-shaped second electrodes. This segmentation reduces the resistance of each individual electrode and eliminates voltage drops across the electrode, thereby preventing image quality deterioration while maintaining manufacturing simplicity
Solution Approach 2:
Different regions of the display area are provided with locally optimized electrode configurations. The stripe-shaped second electrodes are strategically positioned and dimensioned to match the specific electrical and optical requirements of different display regions, ensuring uniform voltage distribution and consistent image quality across the entire display
2Reliability
If multiple stripe-shaped second electrodes with varying thicknesses are used, then voltage drops are minimized, but the manufacturing process becomes more complex
Solution Approach 1:
The thickness of the stripe-shaped second electrodes is varied as a design parameter to optimize electrical performance. By controlling the thickness parameter across different electrode regions, the patent achieves uniform voltage distribution and minimized voltage drops while maintaining compatibility with standard thin-film fabrication processes
Data Source
AI summary
An organic light-emitting display apparatus includes a substrate including a display area and a peripheral area surrounding the display area, a plurality of pixels being disposed in the display area, a plurality of first electrodes in the display area, a plurality of stripe-shaped second electrodes in the display area, the second electrodes extending in a first direction and being spaced apart from each other in a second direction crossing the first direction, and each of the plurality of the second electrodes having an uneven thickness along a third direction inside the display area, an intermediate layer between corresponding first and second electrodes, the intermediate layer having a light-emitting layer, and a connection wiring in the peripheral area, the connection wiring electrically connecting the plurality of the second electrodes with each other.