Micro LED Pixel Layout With Shared Repair Units for Higher Resolution
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Solution Overview
Problem
Micro LED display devices face challenges with sub-pixel defects due to limited yield and inefficient repair units, leading to reduced display area ratio and resolution.
Innovation Solution
A display device design where one repair unit can repair any one of three sub-pixel units, reducing the number of repair units and increasing the display area ratio and resolution by using a layout where repair electrodes are fewer than pixel electrodes, with parallel connecting lines between pads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If one-to-one arrangement of sub-pixel units and repair units is used, then repair capability is ensured, but display area ratio and resolution are reduced
Solution Approach 1:
The repair unit is designed to repair multiple sub-pixel units (three sub-pixel units) instead of being limited to a single sub-pixel unit. This multi-functional design allows one repair unit to serve multiple purposes, reducing the total number of repair units needed and increasing the display area ratio while maintaining repair capability.
Solution Approach 2:
Multiple repair functions are merged into a single repair unit, allowing it to repair any one of three sub-pixel units. This consolidation reduces the number of separate repair units required, thereby increasing the display area ratio and resolution without compromising repair reliability.
2Reliability
If one-to-one arrangement of sub-pixel units and repair units is used, then repair capability is ensured, but resolution is reduced
Solution Approach 1:
The repair unit is designed with universal repair capability to fix any one of three sub-pixel units, reducing the number of repair units needed. This decreases the space occupied by repair units, allowing for higher resolution displays with more pixel units per unit area.
Solution Approach 2:
Multiple repair functions are combined into a single repair unit that can service three sub-pixel units. This merging reduces the overall count of repair units, thereby increasing the density of display elements and improving resolution.
3Reliability
If multiple repair units are used for each sub-pixel unit, then repair reliability is improved, but layout space is wasted
Solution Approach 1:
Instead of allocating dedicated repair units to each sub-pixel unit, a universal repair unit is designed that can repair any one of three sub-pixel units. This approach maintains repair reliability while significantly reducing the number of repair units needed, thus optimizing layout space.
Solution Approach 2:
Multiple repair functions are merged into a single repair unit, eliminating the need for separate repair units for each sub-pixel unit. This consolidation reduces layout space requirements while maintaining the ability to repair sub-pixel units effectively.
Data Source
AI summary
A display device includes multiple layout units arranged in array and multiple light emitting elements disposed in the layout units. Each layout unit includes multiple pixel units, multiple repair units and a common electrode. Each pixel unit includes multiple sub-pixel units, and each sub-pixel unit includes a pixel electrode. One of the repair units is used to repair any one of three of the sub-pixel units, and each repair unit includes a repair electrode. In each layout unit, the number of the repair electrodes is smaller than the number of the pixel electrodes. Each light emitting element includes a first pad electrically connected to the pixel electrode or the repair electrode, and a second pad electrically connected to the common electrode. The light emitting elements have a shortest connecting line between the first pad and the second pad apiece while the shortest connecting lines are parallel to each other.