OLED Sub-Pixel Resonating Region Segmentation
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Solution Overview
Problem
Organic light-emitting display devices with resonating structures improve extraction efficiency but degrade viewing angle characteristics, leading to reduced luminance and color shift issues depending on the viewer's angle.
Innovation Solution
Incorporating both resonating and non-resonating regions in sub-pixels, with a semi-transparent layer in the resonating region and a single transparent layer in the non-resonating region, to enhance light extraction and maintain viewing angle performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a resonating structure is used in an organic light-emitting display device, then extraction efficiency is improved, but viewing angle characteristics are degraded
Solution Approach 1:
The pixel electrode is divided into multiple regions: a resonating region with a semi-transparent layer and cavity structure for enhanced light extraction, and non-resonating regions with different electrode configurations. This segmentation allows different parts of the same pixel to serve different functions - the resonating region improves extraction efficiency while non-resonating regions maintain viewing angle characteristics.
Solution Approach 2:
Different regions of the pixel electrode are assigned different optical properties and structures. The resonating region has a semi-transparent layer with specific thickness and material composition optimized for light resonance, while non-resonating regions have different configurations. This local differentiation enables simultaneous optimization of extraction efficiency in the resonating region and viewing angle characteristics in non-resonating regions.
2Productivity
If a resonating structure is used in an organic light-emitting display device, then extraction efficiency is improved, but color shift occurs depending on viewing angle
Solution Approach 1:
The pixel electrode is divided into resonating and non-resonating regions. The resonating region enhances extraction efficiency through resonance effects, while non-resonating regions emit light with consistent color characteristics across viewing angles. This segmentation prevents the color shift that would occur with a complete resonating structure by providing a reference color from the non-resonating regions.
Solution Approach 2:
Different regions have different optical qualities - the resonating region is optimized for extraction efficiency with specific semi-transparent layer properties, while non-resonating regions are optimized for color consistency. This local quality differentiation allows the overall pixel to maintain color stability across viewing angles while still benefiting from enhanced extraction in the resonating region.
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 approach improves both extraction efficiency and viewing angle characteristics, maintaining luminance and color consistency across various angles by combining resonant and non-resonant light emission mechanisms.
Implementation Method 1
the resonating structure is configured so that a semi-transmissive electrode is formed at a side of one of the anode or the cathode, towards which an image is realized, and a total reflective electrode is formed at a side of the other one of the anode or the cathode. Thus, light beams constructively interfere with each other while reciprocating between the anode and the cathode
Implementation Method 2
light beams constructively interfere with each other while reciprocating between the anode and the cathode, and light that is significantly enhanced may be extracted from each sub-pixel
Implementation Method 3
an organic light-emitting display device realizes colors by recombining holes and electrons, which are injected from an anode and a cathode to an emission layer
Data Source
AI summary
An organic light-emitting display device having improved extraction efficiency and viewing angle characteristics includes a sub-pixel having a resonating region in which light generated by an emission layer resonates and is emitted, and a non-resonating region in which light does not resonate and is emitted.