Light-Emitting Element Groove Alignment for Uniform Luminance
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Solution Overview
Problem
Existing light emitting devices face challenges in efficiently and uniformly aligning subminiature light emitting elements between electrodes, which affects emission characteristics such as luminance and efficiency.
Innovation Solution
A light emitting device design featuring a substrate with parallel electrodes and an insulating layer with grooves, where light emitting elements are aligned using a combination of physical and electrical alignment schemes, including a rubbing process to form grooves in the insulating layer and applying an electric field to self-align the elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If light emitting elements are disposed between electrodes without alignment structures, then device structure is simple, but alignment uniformity and emission characteristics deteriorate
Solution Approach 1:
The insulating layer is segmented by forming grooves that divide the space between electrodes into distinct regions, guiding light emitting elements to specific positions. This segmentation provides physical alignment cues without requiring complex external alignment systems.
Solution Approach 2:
Grooves are formed in the insulating layer before light emitting elements are disposed between electrodes. This preliminary action creates predetermined alignment paths that guide element placement, ensuring uniform alignment before the actual assembly process.
2Manufacturing precision
If conventional alignment methods are used, then alignment process is simple, but alignment precision and emission uniformity deteriorate
Solution Approach 1:
The insulating layer with grooves acts as an intermediary structure between electrodes and light emitting elements. It provides a mediating alignment mechanism that physically guides elements into correct positions without requiring complex external alignment equipment or processes.
Solution Approach 2:
The patent replaces complex mechanical alignment systems with a passive geometric alignment mechanism using grooves. The groove geometry itself provides the alignment function, eliminating the need for active mechanical positioning systems.
3Illumination intensity
If light emitting elements are not precisely aligned, then manufacturing process is fast, but luminance and emission efficiency deteriorate
Solution Approach 1:
The groove structure enables light emitting elements to self-align during the disposal process. Elements naturally follow the groove paths to their correct positions, eliminating the need for time-consuming external alignment operations while ensuring precise positioning for optimal luminance.
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 approach enhances the uniformity and efficiency of light emission by ensuring precise alignment of light emitting elements between electrodes, improving luminance and emission uniformity in light emitting devices and display devices.
Implementation Method 1
an insulating layer disposed on the substrate on which the first electrode and the second electrode may be formed. The insulating layer may include a groove extending in a first direction intersecting with the first electrode and the second electrode
Implementation Method 2
aligning the light emitting elements by forming an electric field between the first electrode and the second electrode
Data Source
AI summary
A light emitting device includes first and second electrodes disposed on a substrate; an insulating layer disposed on the substrate and including a groove extending in a first direction intersecting with the first and the second electrodes, and first and second contact portions that expose areas of the first and the second electrodes; light emitting elements disposed in the groove between the first and the second electrodes, each including first and second ends electrically connected to the first and second electrodes, respectively; a first contact electrode electrically connected to the light emitting elements on the first ends, and electrically connected to the first electrode on the first contact portion; and a second contact electrode electrically connected to the light emitting elements on the second ends, and electrically connected to the second electrode on the second contact portion.