Micro LED Groove Alignment Using Electrostatic Repulsion Fields
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Solution Overview
Problem
Current methods for aligning micro LEDs in micro LED displays face challenges in achieving precise spacing and location alignment, leading to reduced yield and increased costs due to direct transfer schemes, which are not suitable for mass production.
Innovation Solution
A method utilizing electrostatic repulsion to align micro LEDs by creating a non-uniform electric field between electrode layers and grooves in an insulating layer, allowing micro LEDs to be accurately positioned at regular spacings, thereby improving assembly yield and precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If direct transfer technology is used to align micro LEDs, then micro LEDs can be positioned at desired locations, but spacing deviation occurs and precise alignment cannot be achieved
Solution Approach 1:
The patent replaces mechanical direct transfer alignment with an electrostatic field-based alignment system. Electrode layers generate electric fields that interact with micro LEDs to achieve precise positioning, eliminating the spacing deviation issues inherent in mechanical stamp transfer methods.
Solution Approach 2:
The patent changes the alignment mechanism from mechanical contact to electrostatic field interaction by controlling electric field parameters (voltage, electrode configuration). This allows dynamic adjustment of alignment precision and spacing regularity without physical contact, resolving the contradiction between location accuracy and spacing uniformity.
2Productivity
If direct transfer scheme is used for mass production, then production speed increases, but defective products cannot be re-manufactured and yield decreases
Solution Approach 1:
The patent introduces a dynamic, multi-stage alignment process using electrostatic fields that allows for adjustment and correction during assembly. Unlike fixed mechanical transfer, the electrostatic system can adapt to variations and enable re-manufacturing of defective products, improving yield while maintaining mass production efficiency.
Solution Approach 2:
The electrostatic alignment system incorporates feedback mechanisms where electrode configurations and voltage parameters can be adjusted based on alignment results. This enables quality control and re-work capability in mass production, resolving the contradiction between productivity and reliability.
3Manufacturing precision
If micro LEDs are aligned with great deviation in spacing, then alignment at precise locations becomes fundamentally limited, but manufacturing complexity increases
Solution Approach 1:
The patent divides the alignment function into multiple electrode layers with distinct roles (positioning, spacing control, fine-tuning). This segmentation allows each layer to handle specific aspects of alignment, achieving high precision without requiring a single overly complex alignment mechanism.
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 enables precise alignment of micro LEDs with an error range of ≤0.1 μm, enhancing the assembly yield and efficiency, and facilitating the production of high-resolution displays suitable for various applications, including optical sensors and flexible displays.
Implementation Method 1
a method for aligning micro LEDs at a regular spacing using an electrostatic repulsion occurring between the plurality of micro LEDs
Implementation Method 2
generating an electric field with a non-uniform magnitude to align the micro LED in the groove
Data Source
AI summary
A micro LED alignment method includes the steps of: (a) arranging, on a substrate, a first electrode layer and a second electrode layer spaced apart from each other; (b) arranging an insulation layer on the substrate on which the first electrode layer and the second electrode layer are arranged; (c) forming a plurality of grooves at regular intervals in a portion, of the insulation layer, corresponding to the region between the first electrode layer and the second electrode layer; and (d) aligning the plurality of micro LEDs at regular intervals by means of repulsive force generated between one micro LED and another adjacent micro LED through the generation of an electric field in the first electrode layer and the second electrode layer, while supplying, onto the substrate, a solution containing the plurality of micro LEDs, wherein in step (d), one micro LED can be aligned with one groove.