Micro-LED Display Panel Layout With Multiplexed Alignment Marks
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Solution Overview
Problem
Current micro-LED display screens face the issue of alignment marks occupying valuable pixel space, which hinders the increase in pixels per inch (PPI) due to the need for multiple transfer processes and space-consuming alignment marks.
Innovation Solution
The integration of functional component groups, including fingerprint recognition sensors, energy storage capacitors, or antennas, as multiplexed alignment marks between micro-LED chips, allowing these components to serve dual functions and eliminate the need for additional pixel space for alignment marks, thereby maximizing the area for functional components and increasing design freedom.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If alignment marks are designed on the driving backplates to ensure transfer accuracy, then manufacturing precision is improved, but the area of display pixels is reduced
Solution Approach 1:
The patent merges the alignment mark function with functional components (fingerprint sensors, capacitors, antennas) by disposing these components between adjacent subpixel units. The functional components serve dual purposes: performing their intended functions and acting as alignment marks for mass transfer processes, thereby eliminating the need for separate alignment mark structures that would occupy display pixel space.
Solution Approach 2:
The functional components disposed between subpixel units are designed to perform multiple functions: they serve as both operational components (fingerprint recognition, energy storage, communication) and as alignment marks for the mass transfer process. This multi-functionality resolves the contradiction by eliminating dedicated alignment mark structures while maintaining transfer accuracy.
2Quantity of substance
If multiple repeated transfer processes are used to manufacture one screen, then the number of micro-LED chips is increased, but the manufacturing time is extended
Solution Approach 1:
The driving backplate is divided into multiple partitions, with each partition containing multiple subpixel units and functional components. This segmentation allows for systematic mass transfer processes where micro-LED chips can be transferred in organized groups across multiple partitions simultaneously, improving manufacturing efficiency compared to sequential transfer of individual chips.
Solution Approach 2:
Functional components are pre-disposed on the driving backplate at their final positions between subpixel units before the mass transfer process. This preliminary arrangement of functional components serves as pre-established alignment references, enabling more efficient mass transfer operations and reducing the number of repeated transfer processes needed.
Data Source
AI summary
A display panel, a manufacturing method thereof, and a display device are provided. The display panel includes a driving backplate, functional component groups, and micro-LED chips. The functional component groups are integrated in regions where the micro-LED chips are not disposed and are multiplexed as alignment marks. In a mass transfer process of the micro-LED chips, the alignment marks are prevented from additionally occupying pixel space by using part of functional components multiplexed as the alignment marks under a precondition of ensuring alignment accuracy.