Multi-Element Lighted Display Testing with Combinational Logic
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Solution Overview
Problem
Current methods for testing multi-segmented lighted displays, such as those used in PCB assemblies, are time-consuming, expensive, and prone to errors due to the complexity of analyzing large amounts of data from densely packed LEDs, often requiring significant computing resources and are not scalable for large displays.
Innovation Solution
A system and method utilizing a test module with light detection elements that generate signals upon detecting light from LEDs, processed by a circuit with combinational logic to produce an aggregate output signal indicating the functionality of the display, which can include electrical or optical signals, and uses light pipes to align detection with emission for efficient data processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional vision testing systems using video cameras and frame grabbers are used to test multi-element lighted displays, then comprehensive optical and electrical characteristics can be detected, but the system becomes expensive, large, and requires sophisticated algorithms with large amounts of computer processing power
Solution Approach 1:
The patent divides the testing system into modular components: multiple independent photodetector elements, each paired with a light-emitting element through light pipes. Each photodetector independently detects light from its corresponding LED, converting optical signals to electrical signals. This segmentation eliminates the need for complex video camera systems and frame grabbers, reducing device complexity while maintaining detection accuracy through parallel independent measurement channels.
2Measurement precision
If high-resolution cameras and computer vision algorithms are used to test densely packed LEDs, then detailed optical characteristics can be captured, but the amount of data to be analyzed increases significantly, requiring more computing resources and time
Solution Approach 1:
The patent replaces the mechanical/optical imaging system (video camera and frame grabber) with direct electrical detection using photodetectors. Each photodetector converts light directly into an electrical signal that can be immediately processed, eliminating the need for complex image capture and digital analysis. This substitution of direct electrical measurement for optical imaging dramatically reduces data processing requirements and testing time while maintaining precise optical characteristic detection.
3Ease of operation
If optical testing methods using infra-red cameras are used for multiple PCB assemblies, then non-contact testing can be performed, but scalability is limited due to angle-of-view considerations and physical room/layout constraints
Solution Approach 1:
The patent transitions from two-dimensional optical imaging (camera viewing the PCB surface) to a distributed three-dimensional arrangement where photodetectors are positioned in close proximity to each light-emitting element, often directly above or adjacent to them. This spatial reconfiguration allows each photodetector to independently monitor its corresponding LED without angle-of-view limitations, enabling scalable testing of multiple PCB assemblies regardless of physical layout constraints.
4Measurement precision
If traditional testing methods route signals from photodetectors through complex test equipment, then detailed analysis of each LED can be performed, but the testing process becomes time-consuming and expensive
Solution Approach 1:
The patent merges the light-emitting function and light-detecting function into a tightly coupled integrated test module. Each photodetector is directly associated with its corresponding light-emitting element through light pipes, creating self-contained test units. Multiple such units can be tested simultaneously in parallel, dramatically increasing throughput while maintaining the ability to analyze individual LED characteristics through their respective photodetector signals.
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 time and costs by efficiently processing signals from multiple LEDs, improving scalability and accuracy, ensuring that faulty elements are detected without rejecting entire PCB assemblies, thus preventing potential damage.
Implementation Method 1
Each of the plurality of light detection elements may be configured to generate a signal upon detection of light emitted from a light emitting element
Implementation Method 2
uses light pipes to align detection with emission for efficient data processing
Data Source
AI summary
Systems and methods for testing a light emitting display unit having a plurality of light emitting elements are disclosed. Embodiments include a system with a test module, the test module including a plurality of light detection elements. Each of the plurality of light detection elements may generate a signal upon detection of light emitted from a light emitting element. The test module may also include a circuit. The circuit may receive input signals from the plurality of light detection elements, process the input signals based on a pre-determined function of the circuit, and generate an aggregate output signal based on the processing of the input signals. The circuit may also process the input signals based on discrete implementation of a combinational logic. The circuit may further receive instructions determining the combinational logic to be implemented.