Photodiode Array Luminance Testing for LED Modules
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Solution Overview
Problem
Light emitting modules often fail to meet appropriate luminance requirements due to manufacturing errors, necessitating a testing apparatus to measure and adjust their luminance effectively.
Innovation Solution
A light emitting module testing apparatus comprising a sensing unit with a photodiode array and a controller that generates luminance information and adjusts the current value applied to the light source to match pre-set reference ranges, determining module defects based on luminance profiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If light emitting modules are manufactured without precise luminance control, then manufacturing cost and complexity are reduced, but luminance uniformity and product quality deteriorate
Solution Approach 1:
The sensing unit is divided into multiple photodiodes arranged in an array, with each photodiode measuring luminance at a specific location. This segmentation allows precise measurement of luminance across different regions of the light emitting module, enabling detection of non-uniformity without requiring a single complex sensing device
Solution Approach 2:
The patent replaces manual or mechanical luminance measurement methods with an optical sensing system using photodiodes. The photodiode array optically detects luminance distribution, substituting mechanical adjustment and manual measurement with automated optical detection, thereby improving measurement precision while reducing operational complexity
2Measurement precision
If a single photodiode is used for luminance sensing, then device complexity is reduced, but measurement precision and spatial resolution of luminance distribution deteriorate
Solution Approach 1:
The sensing unit is divided into multiple photodiodes arranged in an array, with each photodiode measuring luminance at a specific location. This segmentation allows precise measurement of luminance across different regions of the light emitting module, enabling detection of non-uniformity without requiring a single complex sensing device
Solution Approach 2:
The patent transitions from a single-point luminance measurement to a multi-point spatial measurement by arranging photodiodes in an array. This adds spatial dimensionality to the measurement, allowing the system to map luminance distribution across the light emitting module's output surface, thereby improving measurement precision through spatial resolution
3Productivity
If luminance measurement is performed without automated feedback control, then device complexity is reduced, but productivity and quality consistency deteriorate
Solution Approach 1:
The controller receives luminance data from the photodiode array, compares measured luminance values against reference ranges, and automatically adjusts the operating condition of the light emitting module. This closed-loop feedback control ensures consistent quality while maintaining high productivity through automated adjustment rather than manual intervention
Solution Approach 2:
The system enables the light emitting module to self-adjust its operating condition through automated feedback control. The controller automatically modifies the operating condition based on real-time luminance measurements, allowing the system to self-correct luminance non-uniformity without external intervention, thereby improving productivity while managing complexity through automation
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
The apparatus ensures light emitting modules meet luminance standards by accurately measuring and adjusting their luminance, identifying defects and optimizing performance.
Implementation Method 1
The sensing unit includes a photodiode array sensing light emitted from a light emitting module serving as a test object
Data Source
AI summary
A light emitting module testing apparatus includes a sensing unit and a controller. The sensing unit includes a photodiode array sensing light emitted from a light emitting module serving as a test object. The controller generates luminance information based on light sensed by the sensing unit, and sets an operating condition of the light emitting module serving as the test object by comparing the generated luminance information with a pre-set reference range. The light emitting module testing apparatus thereby senses luminance of light emitted from the light emitting module serving as a test object, and sets the operating condition of the light emitting module to have an appropriate luminance.