Micro LED Redundancy Transfer for Defective Subpixel Compensation
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Solution Overview
Problem
Existing display devices face challenges in achieving a simplified structure, efficient power consumption, and cost-effective management of defective pixels, particularly in micro LED displays.
Innovation Solution
The integration of multiple pixel circuits into a single micro driver, combined with the selective transfer of redundancy micro LEDs to replace defective main micro LEDs, reduces the total number of LEDs and simplifies the display device structure while maintaining efficient low-power operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple pixel circuits are integrated into one micro driver, then device complexity is reduced and power consumption is lowered, but the difficulty of detecting and measuring defective pixels increases
Solution Approach 1:
The display panel is divided into multiple pixel circuits, each with its own micro LED, allowing independent detection and measurement of defective pixels while maintaining the integrated driver structure. This segmentation enables targeted testing without increasing overall device complexity.
2Reliability
If redundancy micro LEDs are selectively transferred to replace defective main micro LEDs, then manufacturing cost is reduced and device reliability is improved, but the productivity of the manufacturing process decreases
Solution Approach 1:
Redundancy micro LEDs are pre-positioned in the display panel during manufacturing, so that when a main micro LED is defective, the replacement can be performed quickly by simply transferring the redundancy LED to the defective position without requiring complex real-time detection and replacement processes.
Solution Approach 2:
The patent implements selective transfer of redundancy micro LEDs based on defect detection, changing the configuration parameter from a fixed redundant structure to a dynamic adaptive structure that only activates replacement when needed, thus balancing reliability improvement with manufacturing productivity.
3Device complexity
If redundancy micro LEDs are transferred only when defective sub pixels are generated, then manufacturing cost is saved and device complexity is reduced, but the reliability of the display device decreases
Solution Approach 1:
A defect detection mechanism provides feedback to the control circuit, which then decides whether to transfer a redundancy micro LED to the defective position. This feedback loop ensures that reliability is maintained only when necessary, avoiding unnecessary complexity while preserving the ability to replace defective pixels when detected.
Data Source
AI summary
In one or more examples, a display device includes a substrate; a pixel configured by a plurality of main sub pixels and a plurality of redundancy sub pixels; one or more pixel driving circuits disposed on the substrate; a plurality of main micro LEDs which is electrically connected to the pixel driving circuit; and a plurality of redundancy micro LEDs which is electrically connected to the pixel driving circuit and the plurality of main micro LEDs is disposed in the plurality of main sub pixels and the plurality of redundancy micro LEDs is disposed in at least some of the plurality of redundancy sub pixels. Accordingly, in consideration of the defect of the main sub pixel, the redundancy micro LED is selectively transferred to only some redundancy sub pixel to reduce a total number of micro LEDs and save the manufacturing cost.