LED Uniformity Detection via Parallel Scanning and Bright Spot Comparison
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Solution Overview
Problem
Existing methods for detecting light amount uniformity in light-emitting devices with numerous LEDs are inefficient, requiring extensive time to calibrate each element individually, which delays production.
Innovation Solution
A method involving a photo-sensing apparatus that scans a light-emitting device multiple times, turning on specific LEDs each time to produce scanned images, and comparing bright spots to determine uniformity, allowing for efficient detection of thousands of LEDs in a few scans.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If each LED is measured and calibrated individually, then the light amount uniformity can be ensured, but the detection time becomes excessively long
Solution Approach 1:
The patent segments the detection process by dividing the array of LEDs into multiple groups that can be detected in parallel. Instead of measuring each LED sequentially, the detection apparatus simultaneously measures multiple LED groups, significantly reducing total detection time while maintaining measurement precision through comparative analysis of bright spot positions and intensities.
Solution Approach 2:
The patent merges multiple detection operations into a single scanning process. By combining the measurement of multiple LED groups into one simultaneous detection operation, the system achieves both time efficiency and measurement accuracy through the photoelectric detector's ability to capture spatial distribution information of all active LEDs in parallel.
2Productivity
If all LEDs are tested simultaneously, then the detection efficiency is improved, but the ability to identify individual LED variations is reduced
Solution Approach 1:
The patent applies local quality analysis by examining the spatial distribution characteristics of bright spots in the scanned image. Each LED's light emission pattern and bright spot position are analyzed locally to identify individual variations, even when multiple LEDs are active simultaneously. This allows the system to maintain individual LED calibration accuracy while achieving parallel detection efficiency.
Solution Approach 2:
The patent replaces the mechanical sequential switching and measurement system with an optical field-based simultaneous detection system. The photoelectric detector captures the spatial distribution of light from multiple LEDs in parallel, using optical signal processing instead of mechanical sequential operations, thereby achieving both high detection efficiency and individual LED identification capability.
3Productivity
If multiple light-emitting devices are detected at the same time, then the production throughput increases, but the complexity of the detection system increases
Solution Approach 1:
The patent implements a universal detection apparatus that can simultaneously detect multiple light-emitting devices using the same optical path and photoelectric detector. The system is designed to handle arrays of LEDs from different devices in parallel, achieving high production throughput without proportionally increasing system complexity through standardized multi-functional detection capabilities.
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 significantly shortens detection duration and enables simultaneous detection of multiple light-emitting devices, ensuring precise calibration without individual testing of each LED.
Implementation Method 1
A photoelectric detector moves along a direction and successively measures the light amounts output by the LEDs
Data Source
AI summary
A method for detecting light amount uniformity is applicable to a light-emitting device including a plurality of light-emitting elements. First, the light-emitting device is placed in a sensed region of a photo-sensing apparatus. Then, the following steps are executed N times: during the nth execution, turning on the (n+i×N)th light-emitting element, where i is 0 or a positive integer, n is less than or equal to N, and n and N are positive integers; detecting light emission of the light-emitting element with the photo-sensing apparatus to produce a scanned image; and finally, comparing whether the bright spots corresponding to the light-emitting elements in the scanned images produced through the N steps are consistent, and outputting an output signal indicating whether the light-emitting device is normal or abnormal.