Micro-LED Display Integration With Defect Isolation and Repair
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Solution Overview
Problem
The implementation of micro-LEDs in display devices faces technical challenges, including the need for efficient LED placement, defect detection, and integration with other manufacturing processes.
Innovation Solution
An integrated manufacturing process for display devices that includes LED placement, testing, defect repair, and layer formation, with component redundancy and electrical isolation of defective LEDs, using methods such as passivation layers and laser cutting to mitigate defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If micro-LEDs are implemented in display devices, then display quality and technology advancement are improved, but manufacturing complexity and technical challenges increase
Solution Approach 1:
The manufacturing process is segmented into distinct modules: LED placement, testing, defect repair, and layer formation. Each module can be independently optimized and executed, reducing overall manufacturing complexity while maintaining high display quality through specialized processing at each stage.
Solution Approach 2:
LED placement and initial testing are performed before final integration into the display device. Defects are detected and repaired in advance during the manufacturing process, allowing corrective actions to be taken before the product reaches the customer, thereby ensuring high reliability without requiring complex post-manufacturing processes.
2Productivity
If LED placement and testing are integrated into the manufacturing process, then manufacturing efficiency is improved, but process complexity increases
Solution Approach 1:
LED placement, testing, defect repair, and layer formation are merged into a single integrated manufacturing process. This allows multiple operations to be performed in sequence without removing the substrate from the processing system, improving manufacturing efficiency by eliminating handling steps and reducing cycle time.
Solution Approach 2:
The manufacturing system is designed to perform multiple functions: placing LEDs, testing their functionality, repairing defects, and forming subsequent layers. This multi-functional approach consolidates what would otherwise require separate equipment and processes, improving productivity while managing complexity through system integration.
3Reliability
If defective LEDs are isolated using passivation layers and laser cutting, then display reliability is improved, but manufacturing steps increase
Solution Approach 1:
Defective LEDs are electrically isolated from the functional circuit by applying passivation layers and using laser cutting to sever electrical connections. This extracts the defective elements from the operational system, preventing them from affecting display reliability while using targeted local processing rather than requiring complete device disassembly or complex repair procedures.
4Reliability
If component redundancy is implemented, then functionality is maintained despite defects, but device complexity increases
Solution Approach 1:
The manufacturing process includes built-in defect detection and repair capabilities that cushion against potential failures. By identifying and correcting defects during manufacturing rather than allowing them to reach the customer, the system maintains functionality without requiring excessive component redundancy, as the primary defense is preventive rather than compensatory.
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
Ensures reliable operation of display devices by isolating defective LEDs, maintaining functionality through redundant components, and enhancing manufacturing efficiency.
Implementation Method 1
electrically isolating a first electrical contact of the first LED from a first electrode of the display device
Implementation Method 2
laser cutting to mitigate defects
Data Source
AI summary
A method includes providing a first substrate which has an active layer, a metal layer, a passivation layer disposed on the metal layer, a first patterned metal layer passing through the passivation layer to electrically connected to the active layer, an insulating layer disposed on the passivation layer, and a second patterned metal layer passing through the insulating layer to electrically connected to the first patterned metal layer. A part of the metal layer does not serve as a portion of a thin film transistor, but serves as a portion of a gate line. The method includes providing a second substrate supporting a plurality of elements, transferring at least one of the plurality of elements from the second substrate to the second patterned metal layer of the first substrate, and fixing the at least one of the plurality of elements to the first substrate.