Display Element Transfer Layout to Prevent Mura Uniformity
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Solution Overview
Problem
Mura occurs in display devices due to deviations in light emission characteristics of light emitting elements, caused by minute differences in material mixing ratios, even when manufactured on the same substrate.
Innovation Solution
A method of manufacturing a display device involves grouping light emitting elements based on their light emission characteristics and transferring them onto a substrate such that elements with similar characteristics are adjacent to each other, ensuring consistent display characteristics across the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If light emitting elements are transferred without grouping by light emission characteristic, then the transfer process is simple and fast, but Mura occurs due to deviation in light emission characteristics
Solution Approach 1:
The patent applies preliminary action by measuring and grouping light emitting elements by their light emission characteristics (such as wavelength or intensity) before the transfer process. This pre-grouping ensures that elements with similar characteristics are transferred together and placed in adjacent locations on the substrate, preventing Mura effects while maintaining a systematic transfer process
2Manufacturing precision
If light emitting elements are grouped and transferred by light emission characteristic, then Mura is prevented and display quality is improved, but the measurement and transfer process becomes more complex
Solution Approach 1:
The patent replaces complex manual measurement and classification processes with automated optical measurement systems. The system uses optical devices to measure light emission characteristics (wavelength, intensity) and automatically groups elements based on these measurements, substituting mechanical/manual operations with automated optical-electrical systems that are more precise and efficient
3Reliability
If light emitting elements are arranged by grouping similar characteristics together, then display uniformity is improved, but the transfer time and process duration increase
Solution Approach 1:
The patent merges multiple operations into an integrated system that simultaneously performs measurement, grouping, and transfer. By combining these functions into a coordinated automated process, the system achieves precise grouping by light emission characteristics while maintaining transfer efficiency through streamlined operations and reduced manual intervention
Data Source
AI summary
A method of manufacturing a display device includes: grouping light emitting elements formed on a first substrate based on a light emission characteristic; and transferring the light emitting elements onto a second substrate such that the light emitting elements grouped as the same group are located adjacent to each other.