Micro LED Display Splicing Area Boundary Blurring
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Solution Overview
Problem
Micro LED display devices face issues with poor display quality due to differences in light field distributions between adjacent rectangular regions caused by process errors or photoelectric characteristic differences during the transfer of micro LEDs from a growth substrate to a display substrate, resulting in visible boundaries and reduced image quality.
Innovation Solution
The implementation of a micro LED display device with a display substrate featuring alternating first and second filling positions in a splicing area, where micro light-emitting elements are electrically bonded to conductive pad pairs with different offsets, creating a blurring effect that eliminates obvious boundaries between adjacent regions, thereby enhancing display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If micro LEDs are transferred to the display substrate in fixed rectangular regions using conventional transfer modes, then the transfer process is simple and efficient, but obvious boundaries appear between adjacent rectangular regions due to process errors and photoelectric characteristic differences
Solution Approach 1:
The patent applies local quality by creating a splicing area with a different arrangement pattern (alternating first and second filling positions with different offsets) compared to the regular arranging areas. This local variation in the splicing area specifically addresses the boundary visibility problem without changing the efficient fixed-region transfer approach used in the main display areas, thus maintaining high transfer efficiency while improving display quality at critical boundary regions.
2Productivity
If micro LEDs are arranged in fixed arrays during transfer, then the transfer process is straightforward and high productivity is achieved, but process errors and photoelectric characteristic differences cause light field distribution differences between adjacent regions
Solution Approach 1:
The patent implements local quality by introducing a special splicing area with alternating first and second filling positions that have different offsets relative to conductive pad pairs. This local structural variation compensates for light field distribution differences caused by process errors and photoelectric characteristic variations, ensuring consistent display quality across region boundaries while maintaining the high-throughput fixed-array transfer methodology in the majority of the display substrate.
3Ease of manufacture
If the display substrate is divided into multiple rectangular regions for transfer, then the transfer process becomes manageable and efficient, but adjacent regions exhibit visible boundaries due to accumulated process errors
Solution Approach 1:
The patent applies local quality by designing a splicing area with a distinctive alternating arrangement pattern of first and second filling positions, where micro light-emitting elements have different offsets relative to conductive pad pairs compared to regular arranging areas. This localized structural differentiation in the splicing area effectively masks boundary visibility issues between rectangular regions, maintaining both ease of manufacture through fixed-region transfer and high manufacturing precision at critical transition zones.
4Productivity
If conventional transfer methods are used with fixed picking patterns, then the transfer process is simple and fast, but photoelectric characteristic differences in adjacent transfer regions create display quality issues
Solution Approach 1:
The patent implements local quality by creating a splicing area with alternating first and second filling positions that have different offsets relative to conductive pad pairs, while the majority of the display substrate uses regular arranging areas with consistent patterns. This localized variation in the splicing area specifically addresses light field uniformity issues at region boundaries without compromising the fast transfer speed achieved through simple fixed-pattern picking in the main display regions.
Data Source
AI summary
A micro LED display device including a display substrate, a plurality of conductive pad pairs and a plurality of micro light emitting elements is provided. The display substrate has a first arranging area, a splicing area connected to the first arranging area, and a second arranging area connected to the splicing area, wherein the splicing area is located between the first arranging area and the second arranging area. The conductive pad pairs are disposed on the display substrate in an array with the same pitch. The micro light emitting elements are disposed on the display substrate and are electrically bonded to the conductive pad pairs. A manufacturing method of the micro LED display device is also provided.