Light-Emitting Substrate Electrode Layout for Uniform Mini LED Luminance
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Solution Overview
Problem
Mini LED display apparatuses face issues with weak luminance in light-emitting regions due to insufficient current flow through bonding electrodes, leading to blurring and ghosting in display images.
Innovation Solution
The light-emitting substrate design includes a bonding electrode group with increased impedance between specific bonding electrodes, such as the first bonding electrode and its adjacent electrodes, achieved by varying distances and/or incorporating empty spaces or redundant electrodes, ensuring sufficient current flow for adequate luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the bonding electrode group uses uniform spacing between electrodes, then the manufacturing process is simple, but the luminance is insufficient due to inadequate current flow
Solution Approach 1:
The patent applies local quality by creating non-uniform spacing between bonding electrodes, where the distance between adjacent bonding electrodes varies at different positions. Specifically, the spacing is designed to be larger in certain regions and smaller in others, allowing current to be concentrated in regions with larger spacing to improve luminance output where needed, while maintaining tighter spacing in other regions for manufacturing simplicity and structural integrity.
2Illumination intensity
If the distance between bonding electrodes is increased to improve current flow, then luminance improves, but the area occupied by bonding electrode group increases
Solution Approach 1:
The patent increases the distance between certain adjacent bonding electrodes locally rather than uniformly across the entire bonding electrode group. This allows current flow and luminance to be enhanced in specific regions where larger spacing is provided, while other regions maintain smaller spacing to minimize the overall area occupied by the bonding electrode group.
3Illumination intensity
If redundant bonding electrodes are added to the bonding electrode group, then current flow and luminance improve, but device complexity increases
Solution Approach 1:
The patent changes the spatial parameters of the bonding electrode group by varying the distances between adjacent bonding electrodes. Instead of adding redundant electrodes uniformly, the invention modifies the spacing parameters locally to optimize current flow paths and enhance luminance output while maintaining a relatively simple overall structure.
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 the luminance of light-emitting groups, improving image quality by preventing weak luminance issues and maintaining clear, high-contrast display performance.
Implementation Method 1
An impedance between a first bonding electrode and an adjacent one of the remaining bonding electrodes is larger than an impedance between two adjacent and consecutive ones of the remaining bonding electrodes
Data Source
AI summary
A light-emitting substrate includes a back plate, light-emitting groups, a bonding electrode group, and a flexible circuit structure including a gold finger electrically connected to the bonding electrode group. A light-emitting region of the light-emitting substrate is provided with at least one light-emitting group including a first light-emitting group. The bonding electrode group includes: a first bonding electrode and remaining bonding electrodes, and at least one redundant bonding electrode between the first bonding electrode and an adjacent remaining bonding electrode. A second power supply voltage terminal of the first light-emitting group and the first bonding electrode are electrically connected to a feedback signal line. On the back plate, an orthographic projection of the gold finger overlaps with an orthographic projection of the bonding electrode group. An impedance between the first bonding electrode and the adjacent remaining bonding electrode is larger than that between two adjacent and consecutive remaining bonding electrodes.