Micro-LED Sub-Pixel Repair Using Spare Pixel Mapping
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Solution Overview
Problem
Micro LED displays face challenges in repairing defective sub-pixels, which affects yield and increases costs due to the need for spare micro devices.
Innovation Solution
The implementation of a display system with a defect mapping block that maps data from defective sub-pixels to surrounding spare sub-pixels, along with methods such as color conversion or color filtering to match the color of defective sub-pixels with spare sub-pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If spare micro devices are used to replace defective sub-pixels, then yield is improved, but cost increases
Solution Approach 1:
The patent creates a virtual copy of the defective sub-pixel's function by mapping its data to surrounding spare sub-pixels. Instead of physically replacing the defective micro-LED, the system creates a software-based replica that redirects the defective pixel's data stream to functional spare sub-pixels, thereby maintaining display functionality without incurring the cost of additional physical micro devices
Solution Approach 2:
The surrounding spare sub-pixels are designed to serve multiple functions: they act as normal display elements during regular operation and simultaneously serve as replacement elements for defective sub-pixels. This multi-functionality allows the system to handle defects without requiring dedicated replacement components, reducing overall material requirements and cost
2Ease of repair
If color conversion or color filtering is applied to spare sub-pixels, then color matching with defective sub-pixels is achieved, but device complexity increases
Solution Approach 1:
The patent changes the optical parameters of spare sub-pixels by applying color conversion materials or color filters. This modifies the emission wavelength or absorption characteristics of the spare sub-pixels to match the color profile of the defective sub-pixel, enabling seamless visual integration without requiring complex hardware modifications to the underlying micro-LED structure
Solution Approach 2:
Color conversion materials or color filters are introduced as intermediary layers between the spare sub-pixel and the viewer. These intermediaries transform the light output of the spare sub-pixel to match the color characteristics of the defective sub-pixel, simplifying the repair process by decoupling the electrical control from the optical output
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables efficient repair of defective sub-pixels, increasing yield while reducing costs by utilizing existing spare sub-pixels and minimizing the need for additional spare micro devices.
Implementation Method 1
converting the spare sub-pixel with a color conversion or color filter to create a color same as that of the defected sub-pixel
Implementation Method 2
applying a color filter material to at least one of the primary sub-pixels to convert the combined-wavelength emission into a different emission wavelength
Data Source
AI summary
What is disclosed are structures and methods for repairing emissive display systems. Various repairing techniques embodiments in accordance with the structures and methods are provided to conquer and mitigate the defected pixels and to increase the yield and reduce the cost of emissive displays systems.