OLEDoS Intermediate Layer Segmentation for Leakage Current
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Solution Overview
Problem
Wearable display devices, such as head-mounted displays, face issues with leakage current and color crosstalk due to the proximity of pixels, which can cause dizziness in users, especially when they require high resolution like 2000 pixels per inch, as seen in organic light emitting diode on silicon (OLEDoS) technology.
Innovation Solution
The implementation of a display device design where the intermediate layer between pixel electrodes and common electrodes is electrically disconnected between adjacent pixels, utilizing a heating wiring system to apply a joule heating voltage and disconnect conductive layers, preventing leakage current and color crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the distance between pixels is reduced to achieve high resolution (2000 PPI), then the display resolution is improved, but leakage current is generated between adjacent pixels through conductive layers of the intermediate layer
Solution Approach 1:
The intermediate layer is divided into pixel-specific regions through the pixel defining layer, which electrically isolates adjacent pixels. The heating wiring further segments the intermediate layer by creating electrically disconnected portions between neighboring pixels, preventing leakage current while maintaining high resolution display capabilities
Solution Approach 2:
The harmful conductive portions of the intermediate layer between adjacent pixels are removed or electrically disconnected through the heating process. The heating wiring applies localized heat to specific regions of the intermediate layer, extracting or eliminating the conductive pathways that cause leakage current while preserving the display functionality
2Measurement precision
If the distance between pixels is reduced to achieve high resolution, then the display resolution is improved, but color crosstalk occurs between adjacent pixels
Solution Approach 1:
The pixel defining layer segments the display into distinct pixel regions with non-conductive boundaries. The heating wiring further segments the intermediate layer between pixels, creating electrical isolation that prevents color crosstalk while maintaining the high pixel density required for 2000 PPI resolution
Solution Approach 2:
The pixel defining layer acts as an intermediary barrier between adjacent pixels, providing electrical isolation. The heating wiring modifies the intermediate layer to enhance this isolating effect, preventing color crosstalk while allowing the high-resolution display to function properly
3Stability of the object's composition
If the intermediate layer is made continuous to maintain structural integrity, then the structural stability is improved, but leakage current and color crosstalk occur between adjacent pixels
Solution Approach 1:
The intermediate layer is segmented into pixel-specific conductive regions by the pixel defining layer and heating wiring. This segmentation maintains structural integrity within each pixel while creating electrical isolation between adjacent pixels, preventing leakage current without compromising overall structural stability
Solution Approach 2:
The intermediate layer has different properties in different regions: it remains conductive within pixel areas to maintain structural integrity and functionality, but is electrically disconnected between pixels through the heating process. This local differentiation prevents leakage current while preserving necessary structural characteristics
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively prevents leakage current and color crosstalk, ensuring stable and clear display performance in high-resolution wearable devices without user discomfort.
Implementation Method 1
utilizing a heating wiring system to apply a joule heating voltage and disconnect conductive layers
Data Source
AI summary
A display device that may include a substrate, a driving element layer disposed on the substrate, and a light emitting element layer disposed on the driving element layer. The light emitting element layer may include a pixel defining layer including a plurality of openings defining a corresponding plurality of pixels, a first electrode disposed in each of the pixels and including a first portion covered by the pixel defining layer and a second portion extending from the first portion and corresponding to one of the openings of each of the pixels,, an intermediate layer covering the second portion of the first electrode in the openings of each of the pixels, covering the pixel defining layer between neighboring pixels, and including an electrically disconnected portion corresponding to the heating wiring.