Micro LED Module Sorting for Uniform Hue and Luminance
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Solution Overview
Problem
The manufacturing of micro LED modules faces challenges due to variations in performance characteristics among micro LEDs on a wafer, leading to non-uniform luminance and hue in display devices, which affects the overall display quality.
Innovation Solution
An electronic apparatus is developed to analyze the characteristics of micro LEDs and manufacture modules with uniform hue and luminance by using characteristic information, involving a substrate with electrodes, a camera, and a processor to align and apply current to micro LEDs, capturing images to determine performance grades and arranging them on target substrates accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If micro LEDs are manufactured on a wafer without classification, then manufacturing productivity is improved, but manufacturing precision deteriorates due to performance variations among micro LEDs
Solution Approach 1:
The patent applies preliminary action by measuring and evaluating the performance characteristics of each micro LED while it is still on the wafer, before the wafer is divided into individual chips. This allows the system to record position information and performance data for each micro LED in advance, enabling subsequent classification and sorting based on these pre-collected characteristics, thus resolving the contradiction between maintaining productivity and achieving performance uniformity.
2Device complexity
If micro LEDs with different performances are disposed on target substrate, then device complexity is reduced, but manufacturing precision deteriorates due to non-uniform luminance and hue
Solution Approach 1:
The patent applies local quality by classifying and sorting micro LEDs based on their individual performance characteristics (luminance, hue, etc.) and disposing them on specific target substrates according to their grade. This ensures that each local area (target substrate) receives micro LEDs with similar performance characteristics, achieving uniform luminance and hue across the display while maintaining a relatively simple overall process.
Solution Approach 2:
The patent implements feedback by measuring the performance of each micro LED, recording its position and characteristics, and using this information to guide the subsequent classification and disposal process. The system feeds back the performance data to control the sorting mechanism, ensuring that micro LEDs are correctly grouped by performance grade and disposed on appropriate target substrates, thereby achieving uniform display quality.
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 approach enables the production of micro LED modules with consistent brightness and color, improving display uniformity without the need for a classification process, by ensuring micro LEDs with similar characteristics are grouped together.
Implementation Method 1
a plurality of micro LEDs disposed on a transparent substrate... a camera to capture an image of a plurality of micro LEDs including the light-emitting micro LED
Data Source
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AI summary
A electronic apparatus is provided. The electronic apparatus includes a substrate including a plurality of electrodes in contact with at least part of electrodes of a plurality of micro LEDs disposed on a transparent substrate at a first pitch to apply a current to micro LEDs of the plurality of micro LEDs disposed at a second pitch, a camera disposed opposite to the substrate based on the transparent substrate, and a processor configured to apply a current to the plurality of electrodes on the substrate, control the camera to capture an image of the plurality of LEDs including a light emitting micro LED according to current applying, obtain characteristic information of the light emitting micro LED based on the captured image, and determine a target substrate on which each of the plurality of micro LEDs is disposed based on the obtained characteristic information.