OLED Second Electrode Aperture Layout to Limit Light Diffraction
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Solution Overview
Problem
High-definition display devices, such as organic EL display devices, experience significant light diffraction due to the presence of a second electrode, which reduces image sharpness and clarity, especially in areas where the second electrode is not present, leading to increased intensity of diffracted light.
Innovation Solution
The electronic device is designed with regions where the second electrode is absent, allowing for light transmission and reducing diffraction by varying the arrangement of apertures in the second electrode to minimize regularity, thereby reducing high-intensity diffracted light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the second electrode is made transparent by removing it in certain regions, then light transmission is improved, but diffraction of light occurs and intensity of diffracted light increases
Solution Approach 1:
The second electrode is segmented into multiple discrete electrode regions corresponding to individual pixels, rather than being a continuous transparent region. This segmentation prevents light from passing through large uninterrupted areas, thereby reducing diffraction while maintaining necessary light transmission for sensor operation.
Solution Approach 2:
The second electrode is selectively removed only in specific regions where sensors are located, while maintaining the electrode structure in display regions. This local modification allows light transmission only where needed for sensor function, while preventing diffraction in display areas by maintaining the electrode pattern.
2Illumination intensity
If the second electrode is completely removed to improve light transmission, then sensor performance is improved, but display functionality is lost
Solution Approach 1:
The display surface is segmented into distinct display regions and sensor regions. The second electrode is maintained in display regions to enable display functionality while being removed in sensor regions to enable light transmission for sensor operation. This spatial segmentation allows both functions to coexist.
Solution Approach 2:
The solution transitions from a uniform two-dimensional electrode structure to a spatially varying structure with different electrode configurations in different regions. By considering the third dimension of vertical stacking and regional differentiation, the patent enables both display and sensor functions to operate simultaneously in the same device.
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 design enhances image sharpness and clarity by minimizing the impact of diffracted light on optical components like sensors, improving overall display quality.
Implementation Method 1
in a case where the regions in which the second electrode is not present are periodically placed, diffraction of light may occur and the intensity of diffracted light may increase
Data Source
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AI summary
An electronic device (10) includes a substrate (15), a plurality of first electrodes (30) located on the substrate, a plurality of organic layers (40) located on the first electrodes, and a second electrode (50) that is located on the organic layers and that spreads so as to overlap the plurality of the first electrodes in planar view. The second electrode located in the second display area has a plurality of apertures (51) formed in such positions as not to overlap the first electrodes in planar view and is divided into a plurality of unit regions (57) on the basis of the plurality of first electrodes. The plurality of unit regions includes aperture regions (57A) including the apertures and non-aperture regions (57B) not including the apertures.