Selectable Micro LED Sub-Pixel Repair for Uniform Color Displays
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Solution Overview
Problem
Current Micro LED displays face challenges in efficiently repairing defective pixels due to limited space utilization and uneven light color issues, as conventional methods require longer times and cannot perfectly utilize the backplane space, leading to suboptimal repair solutions.
Innovation Solution
A selectable-repairing Micro LED display with a backplane, pixel units, and micro light emitting elements, where each pixel unit includes original sub-pixel units and selectable-repairing sub-pixel units with separate pads, allowing for flexible repair by transferring and bonding micro light emitting elements to compensation areas and forming repairing circuits between original and repairing pads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If conventional compensation area method is used for repairing defective pixels, then specific light color repair is achieved, but repair time increases and space utilization deteriorates
Solution Approach 1:
The pixel unit is segmented into multiple original sub-pixel units (with different colors) and at least one selectable-repairing sub-pixel unit. This segmentation allows independent repair of specific color sub-pixels without affecting others, enabling faster and more targeted repairs compared to conventional methods that require repairing entire compensation areas.
Solution Approach 2:
The patent introduces dynamic selectability in the repair process through transistor units that can selectively activate different sub-pixel units based on repair needs. The selectable-repairing sub-pixel unit can be dynamically chosen and activated to replace defective original sub-pixel units, making the repair process adaptable and efficient rather than fixed and time-consuming.
2Ease of repair
If conventional compensation area method is used for repairing defective pixels, then repair function is provided, but space utilization of backplane deteriorates
Solution Approach 1:
The selectable-repairing sub-pixel unit serves multiple functions: it can replace any defective original sub-pixel unit regardless of color, and it maintains the same functional capabilities as original sub-pixels. This multi-functionality eliminates the need for separate compensation areas for each color, maximizing backplane space utilization while preserving full repair capability.
Solution Approach 2:
The patent merges the repair function with the display function by integrating the selectable-repairing sub-pixel unit within the pixel unit structure itself. Instead of having separate compensation areas outside the pixel units, the repair sub-pixels are combined with original sub-pixels in the same pixel unit, achieving both repair capability and optimal space utilization.
3Ease of repair
If conventional compensation area method is used for repairing defective pixels, then repair is possible, but light color uniformity deteriorates
Solution Approach 1:
Each original sub-pixel unit and selectable-repairing sub-pixel unit is designed with specific local color characteristics (red, green, blue, etc.). The repair process maintains local quality by replacing defective sub-pixels with ones having identical color properties, ensuring that each location maintains its intended color characteristics and overall display achieves uniform color distribution.
4Productivity
If arrayed Micro LEDs are used in Micro LED display, then display performance is improved, but defective pixel repair capability deteriorates
Solution Approach 1:
The pixel unit is segmented into multiple original sub-pixel units (with different colors) and at least one selectable-repairing sub-pixel unit. This segmentation allows independent repair of specific color sub-pixels without affecting others, enabling faster and more targeted repairs compared to conventional methods that require repairing entire compensation areas.
Solution Approach 2:
The patent introduces dynamic selectability in the repair process through transistor units that can selectively activate different sub-pixel units based on repair needs. The selectable-repairing sub-pixel unit can be dynamically chosen and activated to replace defective original sub-pixel units, making the repair process adaptable and efficient rather than fixed and time-consuming.
Data Source
AI summary
A selectable-repairing micro light emitting diode display is provided. A backplane includes a plurality of transistor units. A plurality of pixel units are disposed on the backplane, and each of the pixel units includes a plurality of original sub-pixel units and at least one selectable-repairing sub-pixel unit. Each of the original sub-pixel units includes a set of original pad. The set of original pad is disposed on the backplane and connected to one of the transistor units. The at least one selectable-repairing sub-pixel unit is arranged between two of the original sub-pixel units next to each other and having different colors, and includes a set of repairing pad. The set of repairing pad is not connected to the transistor units. A plurality of micro light emitting elements are electrically connected to the sets of original pad and controlled to emit light through the corresponding transistor units, respectively.