MicroLED Subpixel Repair Interface for Defective Serial LEDs
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Solution Overview
Problem
MicroLED display panels face high power consumption and defects such as non-working pixels due to limitations in TFT technology and the need for efficient repair mechanisms to compensate for missing or shorted LEDs.
Innovation Solution
The implementation of LED pixel drive circuits with redundant LEDs in parallel or series connections, along with repair structures like laser fuses to isolate or bypass defective elements, enhancing assembly yield and reducing power dissipation in the TFT circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If redundant LEDs are connected in parallel to compensate for defective elements, then reliability is improved, but device complexity increases
Solution Approach 1:
The display circuit is segmented into multiple parallel LED paths within each pixel, allowing independent operation of each LED. This segmentation enables the system to tolerate individual LED failures while maintaining overall display functionality, resolving the contradiction between reliability and complexity by organizing redundancy at the component level rather than requiring complex control systems
Solution Approach 2:
Redundant LEDs are built into the pixel circuit structure in advance, providing a cushion against future failures. The repair interface with selectable connections is pre-configured to allow bypassing defective LEDs later, ensuring reliability without requiring complex real-time decision-making systems
2Use of energy by moving object
If drive transistor power consumption is reduced by modifying circuit configuration, then energy efficiency is improved, but manufacturing precision requirements increase
Solution Approach 1:
The circuit configuration is made dynamic through selectable connections that can be programmed after manufacturing. The repair interface allows the system to adapt its electrical configuration based on actual LED functionality, enabling power optimization without requiring extremely precise manufacturing tolerances during assembly
Solution Approach 2:
The circuit allows changing electrical parameters such as current distribution and voltage allocation by selecting different connection configurations. This enables optimization of power consumption by adjusting operational parameters post-manufacturing rather than relying on precise manufacturing control
3Ease of repair
If repair structures are added to bypass defective LEDs, then ease of repair is improved, but device complexity increases
Solution Approach 1:
A repair interface acts as an intermediary between the drive circuit and the LED array. This intermediary layer provides selectable connection points that enable bypassing defective LEDs without requiring complex repair equipment or procedures, simplifying the repair process while adding minimal structural complexity
Solution Approach 2:
The repair functionality is extracted as a separate, modular interface structure that can be independently configured. This allows the repair mechanism to be added without fundamentally redesigning the entire display circuit, easing repair capabilities while controlling overall device complexity
Data Source
AI summary
A system and method are provided for repairing an emissive element display. If a defective emissive element is detected in a subpixel, a subpixel repair interface isolates the defective emissive element. The repair interface may be a parallel repair interface with n number of selectively fusible electrically conductive repair nodes, connected in parallel to a control line of the matrix. Alternatively, the repair interface may be a series repair interface with m number of repair nodes, selectively connectable to bypass adjacent (defective) series-connected emissive elements. If the subpixel emissive elements are connected in parallel, and a defective low impedance emissive element is detected, a parallel repair interface fuses open a connection between the defective emissive element and a matrix control line. If the subpixels include series-connected emissive elements, and a high impedance emissive element is detected, a series repair interface forms a connection bypassing the defective emissive element.