Cell-Seated MicroLED Electrode Layout for High-Yield RGB Assembly
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Solution Overview
Problem
Existing display technologies using semiconductor light emitting diodes face challenges in large-area display manufacturing due to low self-assembly yield, difficulty in transferring millions of elements, and issues with RGB color mixing.
Innovation Solution
A display device structure with a base portion, first and second electrodes separated by a dielectric layer, and semiconductor light emitting diodes seated in cells, utilizing an electric and magnetic field to position and fix the diodes, and applying different ground voltages for color-specific assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If self-assembly method is used to assemble semiconductor light emitting diodes on final substrate, then assembly efficiency is improved, but self-assembly yield is low and diodes may separate after assembly
Solution Approach 1:
The patent applies preliminary action by forming an assembly substrate with specific electrode structures and dielectric layers before the self-assembly process. The substrate includes first and second electrodes with controlled spacing and orientations, along with dielectric layers that pre-establish the electric field configuration needed for reliable diode assembly and fixation, preventing post-assembly separation.
Solution Approach 2:
The patent employs parameter changes by controlling the spacing between first and second electrodes to be less than the thickness of the semiconductor light emitting diode, and by adjusting the orientation and dimensions of electrodes. These parameter adjustments optimize the electric field distribution to improve self-assembly yield while maintaining high assembly efficiency.
2Ease of manufacture
If conventional electrode structure is used in self-assembly, then manufacturing is simpler, but RGB color mixing occurs during assembly
Solution Approach 1:
The patent applies segmentation by dividing the electrode structure into first and second electrodes with different orientations and functions. The first electrode extends in a first direction while the second electrode extends in a second direction crossing the first direction, creating segmented electric field regions that prevent RGB color mixing while maintaining manufacturing feasibility.
Solution Approach 2:
The patent implements local quality by creating different electric field conditions in different spatial regions through the oriented electrode structure. The first and second electrodes generate electric fields with different directions and strengths in respective regions, enabling precise color separation and placement of RGB diodes without mixing.
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
Improves self-assembly yield, prevents diode separation and color mixing, and enhances the assembly rate of semiconductor light emitting diodes in large-area displays.
Implementation Method 1
utilizing an electric and magnetic field to position and fix the diodes
Implementation Method 2
utilizing an electric and magnetic field to position and fix the diodes
Data Source
AI summary
Discussed is a display device including a base portion; a first electrode formed on the base portion; a dielectric layer stacked on one surface of the first electrode; a second electrode disposed on the dielectric layer at a predetermined interval; a barrier rib portion stacked on the dielectric layer to cover the second electrode while forming a plurality of cells; and semiconductor light emitting diodes seated in the plurality of cells, wherein the first electrode is spaced apart from the second electrode with the dielectric layer disposed therebetween.