Organic Light Emitting Display Device Microlens Light Leakage Prevention
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Solution Overview
Problem
Organic light-emitting display devices suffer from low light extraction efficiency due to light leakage, with about 80% of light being trapped within the device, leading to poor performance in bottom emission structures.
Innovation Solution
Incorporating a light leakage prevention layer and microlenses on the overcoat layer of the organic light-emitting display device, with specific configurations of light leakage prevention layers and microlenses in subpixels to prevent light leakage and enhance light extraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If microlenses are formed on the overcoat layer to improve light extraction efficiency, then more light can be emitted outwardly, but light from one subpixel may arrive at microlenses of adjacent subpixels causing light leakage
Solution Approach 1:
The overcoat layer is divided into multiple microlenses, each corresponding to a specific subpixel. This segmentation allows light to be focused within its intended subpixel area while preventing cross-contamination between adjacent subpixels, resolving the light leakage problem while maintaining high light extraction efficiency.
Solution Approach 2:
Each microlens is locally optimized to match the characteristics of its corresponding subpixel. The microlenses have different optical properties tailored to their specific locations, enabling effective light extraction for each subpixel while preventing light from reaching adjacent subpixels' microlenses, thus eliminating light leakage.
2Weight of stationary object
If a bottom emission structure is used, then the device can be fabricated to be light and thin, but about 80% of light generated is trapped within the device leading to poor light extraction efficiency
Solution Approach 1:
Microlenses with curved surfaces are formed on the overcoat layer to modify the optical path of emitted light. The spherical curvature of the microlenses enables effective light extraction by redirecting trapped light outward, achieving high light extraction efficiency in a lightweight bottom emission structure without requiring heavy light extraction components.
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
The solution effectively reduces light leakage between subpixels and improves light extraction efficiency, allowing more light to be emitted outwardly while maintaining high luminous efficiency and preventing degradation of the organic electroluminescent device's performance.
Implementation Method 1
an overcoat layer disposed on a portion of the substrate corresponding to at least one subpixel of the plurality of subpixels, and including microlenses having a plurality of concave portions or a plurality of convex portions
Implementation Method 2
a light leakage prevention layer disposed on a portion of the substrate corresponding to a light-emitting area of at least one subpixel of the plurality of subpixels
Data Source
AI summary
An organic light-emitting display device. A substrate is divided into a plurality of subpixels generating different colors of light. A light leakage prevention layer is disposed on a portion of the substrate corresponding to a light-emitting area of at least one subpixel of the plurality of subpixels. An overcoat layer is disposed on a portion of the substrate corresponding to at least one subpixel of the plurality of subpixels, and includes microlenses having a plurality of concave portions or a plurality of convex portions. An organic electroluminescent device is disposed on the overcoat layer.