Sub-pixel Repair Circuit for Micro LED Fault Compensation
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Solution Overview
Problem
Micro LED display devices face reduced display quality due to faulty Micro LEDs that fail to illuminate during assembly, resulting in short circuits and disconnections, which conventional technologies struggle to effectively address.
Innovation Solution
A sub-pixel repair circuit comprising a circuit driver module, a circuit detection module, a circuit repair module, a light-emitting device, and a backup light-emitting device, where the circuit repair module provides a driving current to the backup light-emitting device in response to fault signals detected by the circuit detection module, enabling fault repair and improved display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Micro LEDs are assembled in batches on the backplane, then manufacturing efficiency is improved, but the risk of assembly failures (short circuits and disconnections) increases
Solution Approach 1:
The patent introduces a repair circuit that performs preliminary detection and repair actions during the assembly process. The detection module identifies faulty Micro LEDs early, and the repair module activates backup light-emitting devices before final assembly completion, preventing defect propagation and improving overall assembly reliability while maintaining batch processing efficiency
Solution Approach 2:
The patent implements a backup light-emitting device mechanism that cushions against assembly failures. When a Micro LED fails during batch assembly, the backup device is activated to compensate for the defect, ensuring continuous display functionality and reducing the impact of assembly failures on overall product reliability
2Reliability
If the light-emitting device is replaced with a backup light-emitting device upon failure, then display quality is improved, but device complexity increases
Solution Approach 1:
The patent merges the normal light-emitting device and the backup light-emitting device into a unified circuit structure with shared control pathways. The detection module, repair module, and backup device are integrated into the existing pixel circuit architecture, allowing seamless switching without requiring separate complex control systems, thus limiting the increase in device complexity
Solution Approach 2:
The repair circuit is designed with multi-functionality, serving both as a detection system and a repair system. The same circuit components are used for both identifying faults and activating backup devices, reducing the need for additional dedicated components and thereby limiting the increase in overall device complexity
Data Source
AI summary
A display device, a sub-pixel repair circuit and a repair method therefor. The sub-pixel repair circuit comprises a drive circuit module, a detection circuit module, a repair circuit module, a light-emitting device, and a standby light-emitting device; the drive circuit module is used for providing a drive current to the light-emitting device in response to a data signal of a data line and a scan signal of a scan line; the repair circuit module provides a drive current to the standby light-emitting device in response to a data signal provided by the drive circuit module and a short circuit signal or an open circuit signal provided by the detection circuit module. Thus, fault repair of the light-emitting device is implemented, and the display quality of a display device is improved.