Light-Emitting Electrode Layout for Higher-Resolution Displays
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Solution Overview
Problem
Existing light emitting devices struggle with controlling the alignment density of light emitting elements, which affects the design flexibility and resolution of display devices.
Innovation Solution
A light emitting device with a unique electrode configuration, including a third electrode spaced apart from first and second electrodes, where the number of light emitting elements adjacent to the third electrode is greater than those farther away, allowing for controlled intensity distribution and reduced density, facilitating design changes and higher resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the number of light emitting elements is increased to improve luminance, then the light quantity and luminance per unit area increase, but the pixel size increases and resolution decreases
Solution Approach 1:
The patent applies local quality by creating non-uniform density distribution of light emitting elements within the pixel. Elements are arranged with higher density near the center electrode and lower density toward the edges, optimizing light extraction efficiency in different regions. This allows achieving high luminance per unit area without proportionally increasing the overall pixel area, thus improving resolution.
2Illumination intensity
If the density of light emitting elements is increased to improve luminance, then the light quantity increases, but the design flexibility decreases
Solution Approach 1:
The patent segments the pixel into multiple regions with different light emitting element densities. The pixel is divided into a central region with higher element density and peripheral regions with lower density, allowing independent optimization of each region's characteristics while maintaining overall design flexibility.
Solution Approach 2:
Different regions of the pixel are assigned different local qualities in terms of element density. The central region has higher density for maximum luminance, while edge regions have lower density for design flexibility and manufacturing ease, resolving the contradiction between luminance and design adaptability.
3Ease of manufacture
If light emitting elements are uniformly distributed to simplify manufacturing, then the manufacturing process is easier, but the light quantity per unit area is reduced
Solution Approach 1:
The patent employs preliminary action by pre-defining specific high-density regions and low-density regions in the pixel structure before manufacturing. This predetermined non-uniform distribution pattern is built into the design, guiding the manufacturing process to achieve optimal light quantity per unit area while maintaining reasonable manufacturing simplicity through standardized region-based fabrication.
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A~3B
AI summary
A light emitting device may include: a plurality of first electrodes and a plurality of second electrodes disposed at positions spaced apart from each other in a first direction; a plurality of light emitting elements electrically coupled between a first electrode and a second electrode adjacent to each other among the first and the second electrodes; and a third electrode disposed at a preset position spaced apart from the first electrodes and the second electrodes. The third electrode may be electrically separated from the first electrodes and the second electrodes.