Micro LED Sub-Pixel Repair Layout for Color-Uniform 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 outcomes.
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 areas are provided beside electrode pads for repairing defective Micro LEDs, then defective pixels can be repaired, but the repair process takes longer time and space utilization is not optimal
Solution Approach 1:
The pixel unit is segmented into multiple original sub-pixel units (first, second, third color sub-pixels) with separate electrode pads. This segmentation allows independent repair of individual sub-pixels without affecting others, enabling faster and more efficient repair processes by isolating defective areas.
Solution Approach 2:
The invention introduces selectable-repairing sub-pixel units arranged in a specific spatial pattern between original sub-pixel units. This dimensional arrangement creates multiple repair pathways and compensation options, allowing flexible selection of repair methods to optimize repair time and space utilization.
2Ease of repair
If conventional compensation areas are provided beside electrode pads, then repairs can be performed, but space utilization of the backplane is not perfect and light color uniformity is compromised
Solution Approach 1:
The selectable-repairing sub-pixel units are merged into the pixel unit structure alongside original sub-pixel units, forming an integrated array. This merging eliminates separate compensation areas and utilizes the same backplane space for both display and repair functions, optimizing space utilization.
Solution Approach 2:
The selectable-repairing sub-pixel units serve dual functions: they act as additional light-emitting elements for display purposes and simultaneously serve as compensation elements for repairing defective sub-pixels. This multi-functionality eliminates the need for dedicated repair-only areas, maximizing backplane space utilization.
3Ease of repair
If conventional compensation areas are used for repair, then defective pixels can be fixed, but uneven light color occurs after repair
Solution Approach 1:
Each original sub-pixel unit is designed with specific color characteristics (first, second, third colors) and is paired with corresponding selectable-repairing sub-pixel units of matching colors. This local quality matching ensures that repaired pixels maintain color uniformity with surrounding pixels, preventing color unevenness after repair.
Solution Approach 2:
The invention enables selective activation and deactivation of different sub-pixel units based on their operational status. By changing the operational parameters (active/inactive state) of specific sub-pixel units, the system can compensate for color imbalances and maintain overall color uniformity across the display.
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.