Pixel Circuit Compensation for MicroLED Failure
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The challenge in manufacturing MicroLED display devices is the high failure rate of MicroLEDs during batch-transfer processes, leading to reduced display quality due to their small size and large numbers, which affects the display effect and quality of the device.
Innovation Solution
A pixel circuit comprising a driving circuit and a compensation circuit is designed, where the compensation circuit can input a second power signal to the output terminal in case of a malfunctioning light-emitting element, allowing another pixel circuit to enhance its brightness or substitute for the faulty element, ensuring display effect and improving quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If batch-transfer process is used to manufacture MicroLED display devices, then productivity is improved, but reliability deteriorates due to high failure rate
Solution Approach 1:
The patent applies beforehand cushioning by introducing a compensation circuit that proactively prepares alternative power supply paths before failures occur. When a MicroLED fails, the compensation circuit automatically activates to compensate for the failure, cushioning the impact on overall display quality and maintaining device functionality without requiring recall or repair.
2Manufacturing precision
If MicroLED size is reduced to increase pixel density, then display quality is improved, but reliability deteriorates due to higher failure rate
Solution Approach 1:
The patent applies universality by designing a compensation circuit that serves multiple functions: it can compensate for failed MicroLEDs, enhance brightness of normal pixels, and provide alternative current paths. This multi-functional circuit universally addresses various failure modes and performance variations, allowing the display to maintain quality despite small MicroLED sizes and associated failures.
3Reliability
If compensation circuit is added to pixel circuit, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent applies merging by integrating the compensation circuit functions within the existing pixel circuit structure. The compensation circuit shares power supply lines and control signals with the driving circuit, merging multiple functions into a unified circuit architecture. This reduces the number of separate components and connections, thereby limiting the increase in device complexity while still providing reliability improvements.
Data Source
AI summary
A pixel circuit and a driving method thereof, a display substrate, and a display device are provided. The pixel circuit includes a driving circuit and a compensation circuit, the compensation circuit can connect the output terminal with the second power terminal to receive a second power signal under control of the voltage signal of the control node and a level of the second driving node.