LED display aging test is an indispensable part of the LED display production process. They are also a key step to ensure the quality and stability of LED displays.
With the popularity of LED screens, their high performance and long life have been deeply rooted in people’s hearts, but all this is inseparable from strict quality control processes.
SightLED will explore the details of LED screen aging test in depth.
What is LED screen aging test?
LED screen aging test is essentially a reliability test. They are designed to simulate various environments that LED displays may encounter during long-term use, such as temperature changes, voltage fluctuations, etc., to accelerate the manifestation of potential defects.
This process not only helps to discover and eliminate early failed products, but also improves the overall performance and stability of LED displays through the “running-in” effect. As a result, the LED screen can continue to work stably in actual applications.
Why do perform LED screen aging test?
LED displays may fail during use due to a variety of reasons. If LED screen manufacturers can strictly implement LED screen aging tests, they can maximize the life of LED screens:
Discover and eliminate early faults
LED screens may have potential defects when they first leave the factory, such as：
- Poor welding
- Poor component quality
- Circuit design problems, etc.
These problems may not be exposed in the short term.
However, by simulating long-term continuous operation (usually 24-72 hours), aging tests can accelerate the appearance of defects, such as
- Dead lights
- Uneven brightness
- Color shift, etc.
Thereby, when LED screens shipped from the factory,they are stable and reliable.
Verify stability and reliability
LED display screens may operate in extreme environments,such as :
- high temperature
- high humidity
- continuous high brightness
Aging tests verify the long-term stability of the screen by pressurizing (such as high temperature, full load operation) to avoid sudden failures in actual use.
Evaluate service life and performance degradation
Components such as LED lamp beads, power supplies, and driver chips will gradually age over time, resulting in problems such as reduced brightness and color shift.
By simulating long-term use through aging tests, the LED screen life can be predicted, thereby providing data support for optimizing design (such as heat dissipation and material selection).
Quality control and cost savings
- Screening defective products: Eliminate screens with hidden dangers before leaving the factory to reduce after-sales repair costs.
- Reduce long-term costs: Avoid customer complaints, brand reputation loss or large-scale recalls due to quality problems.
Meet industry standards and customer requirements
High-end applications (such as radio and television, traffic control) usually require LED screens to pass more stringent aging tests.
Customers may require aging test reports as proof of product quality during acceptance.
Standards for LED screen aging tests
The standard process for LED screen aging tests usually includes the following key steps:
- Pretreatment: Place the LED display on the aging test rack and prepare for comprehensive testing.
- Connect the test machine: Perform a comprehensive test on the LED display through the aging machine. Not only limited to LED components, but also all key components such as power supply and drive circuit.
- Voltage and current testing: At each test stage, the product is exposed to different levels of voltage (such as 170V to 258V) and short pulses of high-voltage current to simulate voltage fluctuations in actual use.
- Repeated testing: Each test stage is repeated 8-10 times to ensure the reliability of the test results.
- Life test: Through the test sample unit, experts check the product every 1000 hours until the light goes out, during which low, medium and high voltage tests are performed and data reports are collected.
- Temperature test: The temperature of the LED display screen is tested. For example, the temperature of the LED on the PCB must be lower than 75°C, and the temperature of the flexible LED must be lower than 70°C.
- Fault analysis and improvement: Record all faulty products, analyze the causes of the faults, and evaluate and improve the production process.
Steps of LED screen aging test
The specific steps of the LED screen aging test like this:
- Preparation stage: First, the test environment meets the standards and the status of the LED display screen and test equipment is checked.
- White screen test: The LED display screen is fully white for at least 24 hours to observe whether there are problems such as uneven brightness and color spots.
- Monochrome and grayscale gradient test: Red, green and blue monochrome display and grayscale gradient test are performed separately. Each test lasts for at least 24 hours to check color accuracy and transition smoothness.
- Video and text effect test: Play video and display text for no less than 24 hours to evaluate image clarity, color reproduction and text readability.
- Monitoring and recording: Someone must be on duty during the entire test process to promptly discover and record abnormal conditions and report to the engineering manager for processing.
Time of aging test
The time planning of aging test needs to be flexibly adjusted according to product characteristics and test requirements, but generally follows the following principles:
- White screen test: no less than 24 hours.
- Monochrome and grayscale gradient test: each test is no less than 24 hours.
- Video and text effect test: no less than 24 hours.
- Life test: determined according to the expected life of the product and the purpose of the test, usually lasting thousands of hours.
Test mode
The test modes of LED screen aging test are diverse, mainly including:
- Constant voltage/current test: operate for a long time at a specific voltage/current to observe the stability of the LED display.
- Voltage/current fluctuation test: simulate voltage/current fluctuations in actual use to test the anti-interference ability of the LED display.
- Temperature cycle test: switch between high and low temperature environments to test the temperature adaptability of the LED display.
- Combined test: Combine multiple test modes to comprehensively evaluate the performance and reliability of LED display screens.
LED module aging test
LED module aging test is a test for single or multiple LED modules in LED display screens. This step is to ensure that each module can meet the performance requirements.
The test process is similar to the overall aging test, but it focuses more on module-level detail inspections, such as brightness consistency, color matching, etc.
SightLED screen aging test
Take the well-known LED display manufacturer-SightLED as an example. We will strictly implement the aging test standards during the production process. Our LED screens will pass 72 hours of testing before leaving the factory.
By simulating extreme environmental stress, we can successfully eliminate some early failure products, thereby significantly improving the product yield.
At the same time, through the accumulation and analysis of aging test data, the company continuously optimizes the production process, improves the overall performance and stability of LED display screens, and wins wide recognition in the market.
Summary
LED screen aging test is an important link in the production process of LED display screens. They play an irreplaceable role in ensuring product quality and stability. Through a rigorous aging test process, LED screen manufacturers can discover and eliminate potential defects in advance, improve product performance and reliability, and thus win market trust and user reputation.
In the future, with the continuous development and popularization of LED technology, LED screen aging test technology will continue to innovate and improve.
If you need to find a high-quality LED screen, why not consider us- a manufacturer that insists on higher standards? If you need LED screen, please feel free to contact us.
