MicroLED Detection Line Layout for Batch Yield Testing
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Solution Overview
Problem
The efficient batch detection of miniaturized electrical components, particularly light-emitting elements in MicroLED display technology, is challenging due to their high number and low yield, necessitating improved detection methods to meet high yield requirements.
Innovation Solution
A detection apparatus and method utilizing intersecting first and second signal lines on a substrate to define detection regions, allowing simultaneous signal transmission to multiple elements, enabling batch detection and reducing the number of signal lines, thereby improving detection efficiency and lowering manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of signal lines is increased to detect each light-emitting element individually, then the detection precision is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
Multiple signal lines are merged into a shared signal line that serves multiple detection regions. The same signal line transmits signals to light-emitting elements in different detection regions by controlling the driving circuit at different time points, thereby reducing the total number of signal lines while maintaining detection capability for each element
Solution Approach 2:
The detection system dynamically controls the driving circuit to operate at different time points for different detection regions. This temporal multiplexing allows a single signal line to serve multiple regions sequentially, reducing spatial complexity while maintaining detection precision through time-based differentiation
2Measurement precision
If individual detection of each light-emitting element is performed, then the measurement precision is improved, but the productivity decreases
Solution Approach 1:
The driving circuit operates in periodic cycles, sequentially activating different detection regions at different time points. This periodic operation allows systematic batch detection of multiple light-emitting elements through a shared signal line, improving productivity while maintaining individual element detection precision through time-based separation
3Adaptability or versatility
If more signal lines are used to accommodate more detection regions, then the adaptability is improved, but the ease of manufacture deteriorates
Solution Approach 1:
A single signal line is designed to serve multiple detection regions universally. The signal line maintains electrical connection with light-emitting elements across different regions through the shared connection structure, enabling one signal line to perform multiple detection functions and simplifying manufacturing while preserving adaptability
Data Source
AI summary
Provided is a detection apparatus and a detection method for light-emitting elements. The detection apparatus includes a substrate, first signal lines, and second signal lines, where the first signal lines are disposed on the substrate and extend along a first direction; the first signal lines are configured to transmit a first-type signal to to-be-detected elements; the second signal lines are disposed on the substrate and extend along a second direction; the first direction intersects the second direction; the second signal lines are configured to transmit a second-type signal to the to-be-detected elements; at least some adjacent first signal lines and at least some adjacent second signal lines jointly define at least one detection region on the substrate for accommodating the to-be-detected elements; and the same first signal line is configured to be electrically connected to a plurality of to-be-detected elements located in different detection regions.