Micro-nanofin LED Self-alignment for High-resolution Displays
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Solution Overview
Problem
Current micro-LED and nano-LED display technologies face challenges in manufacturing high-resolution displays due to difficulties in arranging red, green, and blue subpixels, high unit prices, high process defect rates, and low productivity, especially when using pick and place technology, and nanorod-type LEDs have limited emission areas and efficiency due to surface defects and electron-hole recombination issues.
Innovation Solution
A full-color LED display using micro-nanofin LED elements with a stacked structure of conductive semiconductor layers and a photoactive layer, where the elements are self-aligned using an electric field, increasing the emission area and minimizing surface defects, allowing for easier electrode arrangement and improved luminous efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If nanorod-type LED elements are used with stacked structure, then manufacturing complexity is reduced and self-alignment is easier, but emission area is limited and luminous efficiency degrades
Solution Approach 1:
The patent transitions from horizontal stacking (nanorod-type) to vertical stacking (micro-nanofin-type with conductive layers and photoactive layer stacked in thickness direction). This dimensional change allows the emission area to extend in the vertical direction rather than being constrained horizontally, thereby increasing the effective emission area while maintaining manufacturing simplicity through electric field self-alignment.
2Device complexity
If nanorod-type LED elements are used, then device structure is simplified, but surface defects have larger effect and electron-hole recombination efficiency decreases
Solution Approach 1:
The patent introduces separate conductive semiconductor layers (p-type and n-type) at the top and bottom of the photoactive layer, creating localized regions with different electrical properties. This local quality differentiation optimizes carrier injection and extraction at specific interfaces, improving electron-hole recombination efficiency within the photoactive region while maintaining overall structural simplicity.
3Ease of manufacture
If pick and place technology is used for micro-LED displays, then manufacturing process is established, but productivity is low and process defect rate is high for high-resolution displays
Solution Approach 1:
The patent employs electric field self-alignment where micro-nanofin LED elements automatically position themselves onto electrode patterns through electrostatic forces during the drop-casting process. This self-service mechanism eliminates the need for complex pick-and-place operations, enabling direct printing of high-resolution displays with improved productivity and reduced defect rates.
4Manufacturing precision
If red, green, and blue micro-LEDs are arranged one-to-one for 8K resolution, then display resolution is achieved, but unit price increases and manufacturing difficulty increases
Solution Approach 1:
The patent uses a universal micro-nanofin LED element structure with stacked conductive and photoactive layers that can be manufactured in a standardized process. These universal elements are then distributed across all subpixels (red, green, and blue) through electric field self-alignment, eliminating the need for separate manufacturing processes for different colored micro-LEDs and reducing overall manufacturing complexity while achieving 8K resolution.
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
The solution achieves high luminance and efficiency by expanding the emission area, reducing surface defects' impact, and optimizing electron-hole recombination, enabling easier self-alignment and higher resolution displays with improved electrode design and manufacturing processes.
Implementation Method 1
forming an electric field between two alignment electrodes to self-align nanorod-type LED elements on the electrodes
Data Source
AI summary
The present invention relates to a full-color LED display, more particularly, to a full-color LED display using micro-nanofin LED elements and manufacturing method thereof.