Fresnel Lens Layer for OLED Light Efficiency
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Solution Overview
Problem
OLED displays suffer from light dispersion issues, resulting in reduced light efficiency as only a portion of the emitted light reaches the user's eyes.
Innovation Solution
A display device incorporating a lens layer with Fresnel lenses is used, where each Fresnel lens has concentric zones with changing refractive indices along the radial direction, effectively collecting and focusing light emitted from the organic emission layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If light is emitted from the organic emission layer in an OLED display, then light is generated for display, but the light becomes dispersed and only a portion reaches the user's eyes, reducing light efficiency
Solution Approach 1:
A lens layer comprising Fresnel lenses is introduced as an intermediary component between the organic emission layer and the user's eyes. Each Fresnel lens corresponds to a pixel and includes multiple Fresnel zones with different refractive indices that work together to collect dispersed light and redirect it toward the user's eyes, thereby reducing light loss and improving light efficiency
Solution Approach 2:
The lens layer is designed with spatially varying properties where each Fresnel lens has different refractive indices in different regions (Fresnel zones). The refractive index changes stepwise along the radial direction, with inner zones having different refractive indices from outer zones, allowing each region to optimally redirect light from its corresponding pixel location
2Loss of energy
If a lens layer with Fresnel lenses is added to collect and focus light, then light efficiency is improved, but the device structure becomes more complex
Solution Approach 1:
The lens layer is segmented into multiple independent Fresnel lenses, with each lens corresponding to a specific pixel. Each Fresnel lens is further divided into multiple Fresnel zones with different refractive indices. This segmentation allows the complex light collection function to be distributed across multiple simple, modular units that can be manufactured and assembled systematically
Solution Approach 2:
The Fresnel lenses utilize stepwise changes in refractive index across different radial zones to achieve light focusing. By changing the refractive index parameter in discrete steps rather than continuously, the design simplifies manufacturing while maintaining optical effectiveness. The refractive index is changed by selecting different materials or varying material composition in each Fresnel zone
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 configuration enhances light collection and increases the display's photo-efficiency by preventing light dispersion and directing emitted light to a predetermined focal distance.
Implementation Method 1
refractive indices of each of the Fresnel zones change stepwise along the radial direction
Data Source
AI summary
A display device including pixels disposed on a substrate, and a lens layer disposed on the substrate, the lens layer including Fresnel lenses respectively corresponding to the pixels. Each of the Fresnel lenses includes Fresnel zones disposed adjacent to each other in a radial direction with respect to a center of a corresponding Fresnel lens, and refractive indices of each of the Fresnel zones change stepwise along the radial direction.