LED Self-Testing via Photocurrent Decay Factors
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Solution Overview
Problem
The existing methods for testing light-emitting diode (LED) displays are costly and inefficient, particularly when dealing with large batches, as they require additional instruments to check for anomalies and ensure quality, which does not scale well.
Innovation Solution
A method that utilizes the properties of LEDs to perform auto-testing by measuring photocurrents generated between LEDs to determine decay factors, allowing for the assessment of LED performance without external instruments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional testing methods using external instruments are employed, then measurement precision and quality assurance are improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The LED display system performs self-diagnosis by utilizing its own LEDs as both light sources and photodetectors. Each LED can emit light and detect light from other LEDs, enabling the system to test itself without external testing equipment. This self-service mechanism resolves the contradiction by eliminating the need for complex external instruments while maintaining measurement capability through the inherent photodetector properties of LEDs.
Solution Approach 2:
The patent makes LEDs serve dual functions: as light-emitting elements and as photodetectors for receiving and detecting light from other LEDs. This multi-functionality allows the same component to perform both display and self-testing roles, thereby reducing device complexity while maintaining measurement precision through the universal application of LED components.
2Measurement precision
If conventional testing methods with external instruments are used, then measurement precision is improved, but productivity and testing efficiency deteriorate
Solution Approach 1:
The LED display system performs automated self-testing by utilizing its own LEDs as both light sources and photodetectors. This eliminates the need for manual operation of external testing equipment, enabling automated testing that significantly improves productivity and testing efficiency while maintaining measurement precision through the inherent photodetector properties of LEDs.
Solution Approach 2:
The patent enables continuous testing operation by having LEDs continuously emit and detect light signals during normal display operation. This continuous useful action allows testing to occur simultaneously with display function, improving productivity by eliminating separate testing phases and maintaining measurement precision through ongoing monitoring.
3Measurement precision
If conventional testing methods are employed, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The patent implements preliminary self-testing capability within the LED display system, where LEDs continuously monitor each other's performance during normal operation. This preliminary action detects anomalies in real-time before they become critical failures, maintaining measurement precision while reducing the time lost to separate post-manufacturing testing procedures.
Solution Approach 2:
The LED display system performs automatic self-diagnosis by utilizing its own LEDs as both light sources and photodetectors. This self-service mechanism eliminates the need for time-consuming manual testing procedures while maintaining measurement precision through the inherent photodetector properties of LEDs, thereby reducing overall testing time.
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
Enables swift and cost-effective testing of LED displays by using the LEDs themselves to measure photocurrents, determining decay factors and ensuring quality without the need for extra equipment, thus improving efficiency and reducing manufacturing costs.
Implementation Method 1
The third LED is provided to receive the light associated with the first and second LEDs, thereby generating a first photocurrent and a second photocurrent
Implementation Method 2
The first LED is provided to receive the light associated with the second LED, thereby generating a third photocurrent
Data Source
AI summary
To test a first LED, a second LED, and a third LED in a light-emitting unit, a method is disclosed herein comprising the following steps: setting the first and second LEDs in respective driven states to generate associated light; providing the third LED to receive the light associated with the first and second LEDs, thereby generating a first photocurrent and a second photocurrent; providing the first LED to receive the light associated with the second LED, thereby generating a third photocurrent; and calculating a decay factor of each of the LEDs based on the first, second, and third photocurrents.