Mini LED Electrode Layout for Faster Mass Transfer Alignment
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Solution Overview
Problem
The existing technologies face difficulties in aligning and transferring a large number of light emitting devices onto a driving board within a short cycle time due to axisymmetric PN electrode designs, which increases the complexity of the massive transfer process.
Innovation Solution
A light emitting device with a first electrode and a second electrode arranged around the first electrode on a P-type contact layer, where the second electrode is symmetrically disposed with respect to the first electrode, allowing for easier alignment and transfer by abutting and aligning with corresponding electrodes on a thin film transistor (TFT) device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If axisymmetric PN electrode design is used, then the light emitting device structure is simplified, but the alignment and transfer difficulty increases
Solution Approach 1:
The patent applies asymmetry by configuring the first electrode and second electrode with different geometries (circular and rectangular respectively) and different orientations. The first electrode is arranged in a first direction while the second electrode is arranged in a second direction perpendicular to the first direction, creating an asymmetric electrode configuration that enables directional alignment during transfer processes, thereby resolving the contradiction between structural simplicity and alignment ease.
2Ease of manufacture
If axisymmetric PN electrode design is used, then the manufacturing process is simplified, but the massive transfer cycle time increases
Solution Approach 1:
The asymmetric electrode configuration with perpendicular arrangements enables faster alignment during massive transfer processes. The first electrode in the first direction and the second electrode in the second direction provide distinct alignment references that accelerate the transfer cycle time while maintaining manufacturing simplicity through the straightforward layer structure.
3Shape
If axisymmetric PN electrode design is used, then the device structure is compact, but the alignment precision decreases
Solution Approach 1:
The asymmetric electrode design maintains device compactness through the integrated first and second electrodes in different directions while simultaneously improving alignment precision. The perpendicular arrangements of the circular first electrode and rectangular second electrode provide dual-axis alignment references that enhance positioning accuracy during transfer without significantly increasing device footprint.
Data Source
AI summary
A light emitting device, a display panel, and a display panel manufacturing method are provided in the embodiments of the present disclosure. The light emitting device includes a first electrode, and second electrode arranged around the first electrode, and the second electrode is symmetrically disposed with respect to the first electrode. A distance from each of points on the second electrode to a center point of the first electrode is equal. When the light emitting device is transferring, any point on the second electrode abuts the corresponding electrode, thereby reducing the difficulty in a mass transfer process of the light-emitting device.