Micro-LED Transfer Alignment for Uniform Sub-Pixel Emission
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Solution Overview
Problem
Current display device manufacturing methods face challenges in precisely controlling the alignment and quantity of light emitting elements, leading to inconsistencies in light emission intensity across sub-pixels, which affects the overall display quality.
Innovation Solution
A manufacturing method that involves patterning a pixel defining pattern on a substrate, forming an emission stack structure, and transferring light emitting elements onto a base layer and pixel circuit layer, ensuring accurate alignment and electrical contact, using techniques such as stamp transfer, laser, electrostatic, magnetic, or adhesive forces, to prevent overlap with pixel boundaries and ensure uniform surface areas for consistent light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If light emitting elements are formed and transferred without precise alignment control, then manufacturing process is simpler, but alignment precision and light emission uniformity deteriorate
Solution Approach 1:
The pixel defining pattern is formed on the substrate before the light emitting elements are transferred onto the substrate. This preliminary formation of alignment reference structures enables precise positioning of light emitting elements during the transfer process, ensuring that each light emitting element is accurately aligned with its corresponding sub-pixel region without requiring complex real-time alignment control systems.
2Manufacturing precision
If the number of light emitting elements is not precisely controlled, then manufacturing process is faster, but light emission intensity uniformity deteriorates
Solution Approach 1:
The pixel defining pattern creates distinct regional boundaries that define specific areas for light emitting element placement. By forming these localized regions with precise geometric definitions, the method ensures that the correct number of light emitting elements are placed in each sub-pixel area, with each element having a controlled electrical contact surface area, thereby ensuring uniform light emission intensity across different sub-pixels.
3Manufacturing precision
If light emitting elements are not precisely aligned with sub-pixel areas, then manufacturing process is simpler, but light emission consistency deteriorates
Solution Approach 1:
The method replaces complex mechanical alignment systems with a pattern-based alignment approach. The pixel defining pattern serves as a visual and physical guide that enables alignment through optical detection and pattern recognition during the transfer process, eliminating the need for sophisticated mechanical positioning systems while achieving high alignment precision between light emitting elements and sub-pixel areas.
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 method enables precise control over the number and alignment of light emitting elements, resulting in uniform light intensity across sub-pixels, enhancing the display device's performance and quality by preventing short-circuits and ensuring each sub-pixel emits light at a desired intensity.
Implementation Method 1
a transfer using an electrostatic force
Implementation Method 2
a transfer using a magnetic force
Implementation Method 3
a transfer using an adhesive
Data Source
AI summary
A manufacturing method for a display device includes patterning a pixel defining pattern on a substrate; forming an emission stack structure; forming light emitting elements by etching the emission stack structure; and transferring the light emitting elements on a base layer and a pixel circuit layer including a pixel circuit on the base layer. The forming of the light emitting elements includes patterning the light emitting elements in an element forming area enclosed by the pixel defining pattern. The transferring of the light emitting elements includes disposing the light emitting elements in a sub-pixel area corresponding to the element forming area on the pixel circuit layer.