Micro-LED Pixel Driving Circuit for Light Spot Repair
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Solution Overview
Problem
Micro display panels with micro-LEDs face issues with light spots or light lines that need accurate repair without damaging surrounding pixels, which is crucial for high brightness and low power consumption in head-mounted displays.
Innovation Solution
A pixel driving circuit with repair switches in sub-pixel circuit units, controlled by a controlling unit to interrupt current during non-driving periods to prevent light spots or light lines from illuminating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If light spot repair is performed on micro display panel, then light spots or light lines are eliminated, but surrounding good pixels may be damaged
Solution Approach 1:
The pixel driving circuit is divided into independent sub-pixel circuit units, each with its own repair switch. This segmentation allows precise control of current flow to specific micro-LEDs, enabling repair of light spots without affecting surrounding pixels. The repair switch in each sub-pixel circuit unit can be independently activated to target only the defective micro-LED.
Solution Approach 2:
The patent implements local quality control by providing repair switches specifically in sub-pixel circuit units where light spots occur. The controlling unit identifies defective regions and activates repair switches only in those local areas, applying repair current locally to eliminate light spots while leaving surrounding good pixels unaffected.
2Illumination intensity
If micro-LEDs are driven at high brightness, then display quality is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic action by controlling micro-LEDs to illuminate only during driving periods and remain off during non-driving periods. The repair switches are activated during non-driving periods to prevent light spots, while during driving periods only necessary micro-LEDs are activated. This periodic on-off control reduces overall power consumption while maintaining required brightness during active display periods.
Data Source
AI summary
A pixel driving circuit and a micro display panel are disclosed. A repair switch is in at least one sub-pixel circuit unit of each pixel driving circuit unit. A controlling unit controls the repair switch to turn on or off. When a micro-LED of the at least one sub-pixel, which the current flows through, illuminates during a non-driving period, the controlling unit controls the repair switch to interrupt the current. Therefore, the micro-LED of the at least one sub-pixel does not illuminate during the non-driving period and a light spot or light line issue is solved.