Color-Specific Microlens Layout for OLED Light Extraction
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Solution Overview
Problem
Existing electro-optical devices with uniform microlenses fail to optimize light extraction efficiency and visual field angle characteristics due to varying full width at half maximum of light spectra across different colors, leading to insufficient microlens functionality.
Innovation Solution
The electro-optical device employs distinct microlenses with varying curvatures and optical distances for each color light emitting element, tailored to match the specific full width at half maximum of their spectra, ensuring optimal light extraction and visual field angle characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If microlenses with the same curvature are used for all light emitting elements, then the device complexity is reduced and manufacturing is simplified, but the light extraction efficiency and visual field angle characteristic are insufficient
Solution Approach 1:
The patent applies local quality by assigning different curvatures to microlenses based on their position in the display device. Specifically, microlenses in different regions (e.g., center vs. peripheral areas) have different curvatures optimized for their local light extraction requirements, thereby improving overall light extraction efficiency while maintaining a systematic manufacturing approach
Solution Approach 2:
The patent changes the curvature parameter of microlenses to optimize performance. By adjusting the curvature values of microlenses in different regions, the patent achieves improved light extraction efficiency and visual field angle characteristics without completely redesigning the manufacturing process
2Device complexity
If microlenses with the same curvature are used for all light emitting elements, then the device structure is simplified, but the visual field angle characteristic is insufficient
Solution Approach 1:
The patent implements local quality by varying microlens curvatures according to positional requirements. Microlenses in different regions have different curvatures optimized for their specific visual field angle requirements, thereby improving overall illumination characteristics while maintaining reasonable device complexity
Solution Approach 2:
The patent introduces variation in the curvature dimension of microlenses to improve visual field angle characteristics. By adding this dimensional variation, the patent enhances illumination performance without significantly increasing overall device complexity
3Reliability
If microlenses are used to condense light, then the light extraction efficiency is increased, but the visual field angle characteristic may be compromised
Solution Approach 1:
The patent changes the curvature parameter of microlenses to balance light extraction efficiency and visual field angle characteristics. By optimizing curvature values, the patent achieves both effective light condensation and acceptable visual field angle performance
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 enhances light extraction efficiency and visual field angle characteristics by optimizing microlens curvature and optical distances for each color, resulting in improved display performance across the color spectrum.
Implementation Method 1
Each microlens changes a direction of light emitted from the corresponding light emitting element
Data Source
AI summary
An electro-optical device includes: a first light emitting element including an electrode and a first reflective layer disposed apart from the electrode by a first optical distance, a second light emitting element including the electrode and a second reflective layer disposed apart from the electrode by a second optical distance, a first microlens configured such that light emitted from the first light emitting element is incident on the first microlens, and a second microlens configured such that light emitted from the second light emitting element is incident on the second microlens, wherein a full width at half maximum of a spectrum of a first color light corresponding to the first optical distance is different from a full width at half maximum of a spectrum of a second color light corresponding to the second optical distance, and a curvature of the first microlens is smaller than a curvature of the second microlens.