Dual-Junction LED Segmentation Layout to Eliminate Dark Bands
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Solution Overview
Problem
Conventional illumination systems for cameras often suffer from dark bands in the light output due to non-offset boundaries between light-emitting areas, which can lead to uneven illumination and image quality issues.
Innovation Solution
A dual-junction LED array is designed where the first junction emits light from multiple areas separated by boundaries, and the second junction is positioned to pass through the first light, emitting corresponding light from areas with boundaries offset from the first, thereby reducing or eliminating dark bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional LED arrays with aligned boundaries are used, then manufacturing is simpler, but dark bands appear in light output causing uneven illumination
Solution Approach 1:
The patent applies asymmetry by intentionally offsetting the boundaries of the second junction relative to the first junction boundaries. This asymmetric boundary arrangement prevents the formation of dark bands that would occur with aligned boundaries, thereby achieving uniform light output while maintaining manufacturing feasibility through standard fabrication processes.
2Illumination intensity
If dual junction LED array with offset boundaries is used, then light uniformity is improved, but device complexity increases
Solution Approach 1:
The patent segments the LED array into multiple junctions with distinct boundary configurations. By dividing the array into first and second junctions with offset boundaries, the design achieves uniform light output through distributed emission zones, while the segmentation is integrated into the fabrication process rather than adding post-manufacturing complexity.
Solution Approach 2:
The patent changes the geometric parameter of boundary positions between junctions. By adjusting the boundary offset parameter during device design and fabrication, uniform light distribution is achieved without requiring complex control systems or additional components, thereby managing device complexity through parameter optimization.
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 uniformity and reduces dark bands, resulting in improved illumination and image quality by ensuring consistent brightness across the scene, even for objects at different distances.
Implementation Method 1
The first junction can emit first light from a plurality of first light-emitting areas
Implementation Method 2
The second junction can emit second light from a plurality of second light-emitting areas
Data Source
AI summary
An illumination system can include a dual junction light-emitting diode (LED) array including first and second junctions that extend in a plane. The first junction can emit first light from a plurality of first light-emitting areas that are separated by first boundaries. The second junction can be disposed on the first junction such that the first light passes through the second junction. The second junction can emit second light from a plurality of second light-emitting areas. The second light-emitting areas can be separated by second boundaries that correspond in a one-to-one correspondence to the first boundaries. The second boundaries can be offset in the plane from the corresponding first boundaries. The offset can help reduce or eliminate dark bands in the combined first and second light, which could be present if the second boundaries were not offset from the first boundaries.