Solar Cell Array for Precise Light-Emitting Device Testing
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Solution Overview
Problem
Existing light-emitting device testing systems, such as integrating spheres, are costly, labor-intensive, and limited in applicability, especially when testing devices with multiple light-emitting elements, as they cannot accurately locate defective elements, leading to increased quality control efforts and reduced yield.
Innovation Solution
A system utilizing solar cell modules integrated into a testing box with a conveyor belt, where light-emitting devices are energized and transported through a test area, allowing continuous detection of photo energy changes to identify abnormal elements, enabling precise location and correction of issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an integrating sphere is used to test light-emitting devices, then total luminous flux can be obtained, but the device cannot locate defective elements in devices with multiple light-emitting elements
Solution Approach 1:
The patent divides the detection function into multiple solar cells arranged in an array, where each solar cell corresponds to a specific spatial position. This segmentation allows the system to not only measure total luminous flux but also to identify which specific light-emitting element is defective by detecting which solar cell receives abnormal light signals.
2Measurement precision
If an integrating sphere is used for testing, then measurement accuracy is maintained, but testing cost and complexity increase
Solution Approach 1:
The patent replaces the expensive integrating sphere with a simpler detection system using solar cells and a CCD camera. This substitution significantly reduces equipment cost while maintaining the capability to measure luminous flux and identify defective elements, making the testing system more accessible and cost-effective.
3Measurement precision
If an integrating sphere is used, then total luminous flux can be measured, but testing time and labor increase due to positioning and replacing devices
Solution Approach 1:
The patent implements a conveyor belt system that continuously transports light-emitting devices through the detection area. Multiple solar cells are positioned to detect light from different elements simultaneously, eliminating the need to stop, reposition, or replace devices between measurements. This continuous operation significantly reduces testing time and increases throughput.
4Ease of manufacture
If solar cell modules are used instead of integrating sphere, then testing cost decreases, but the ability to test devices with specific directivity is limited
Solution Approach 1:
The patent designs a detection system with multiple solar cells arranged in a two-dimensional array, allowing it to handle various light source configurations and directivities. The system can test different types of light-emitting devices by adjusting the detection parameters and positioning, making it universally applicable while maintaining cost-effectiveness.
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 reduces testing costs, increases efficiency, and allows for rapid identification and correction of defective elements, thereby enhancing the yield of light-emitting devices.
Implementation Method 1
solar cell modules 21 mounted to each interior wall of a testing box 22... photo energy of the energized DUT 23 is received by the solar cell modules 21
Data Source
AI summary
A method for testing light-emitting devices in a batch-wise, associated with a system for the same purpose, comprises the steps of: preparing the light-emitting devices on a moving carrier unit in a manner of aligning a predetermined longitudinal direction of the light-emitting devices with a predetermined transportation direction of the moving carrier unit, each of the light-emitting devices further having plural light-emitting elements; transporting orderly the light-emitting devices to pass a test area on a base of the system, in which the base energizes only the light-emitting elements within the test area; and, a solar cell module detecting continuously the energized light-emitting elements within the test area and further forming signals with respect to photo energy received in the test area.