LED画面に一貫性のない明るさを引き起こすもの? これにどのように対処できますか?

LED screens often exhibit areas with brightness levels that differ from other parts of the screen. Based on the structural composition of LED screens, we can analyze this phenomenon. LED screens are assembled from multiple LED modules or LED cabinets, offering the advantage of arbitrary sizing and no restrictions on conventional resolution.
しかし, this assembly method can also lead to issues where the brightness of individual modules may differ from other areas. As shown in the figure below.
Why does this issue occur? How can it be analyzed and resolved? LED screens are typically composed of LED modules or LED cabinets. LED cabinets consist of LED modules, ribbon cables, receiver cards, 電源, and power cables. LED cabinets are interconnected using network cables, while LED modules are connected via ribbon cables when assembled in a modular configuration.
When encountering issues with inconsistent brightness on an LED display screen, one should first observe the characteristics of the affected area, as well as the location and size of the affected area to determine if there is a pattern. 例えば, is the size of the affected area consistent with the size of an LED module, an LED cabinet, all LED cabinets connected by a single network cable, or all LED cabinets or LED modules connected by a single power cable?
By identifying commonalities and characteristics, we can quickly determine the cause of the issue with the screen.

1. Common Causes of LED Screen Brightness Inconsistency

1. The LED screen may use different models of receiver cards. Different models of receiver cards may have different processing algorithms, and even different firmware versions of the same model may vary slightly. Therefore, it is advisable to use the same type of receiver card throughout an LED display screen to avoid brightness inconsistencies. This issue should be noted.
2. The LED screen may use LED modules or cabinets from different production batches. LED modules or cabinets produced in different batches may have significant variations in LED chip manufacturing. When mixing and matching modules or cabinets from different batches, this can result in brightness inconsistencies. The following figure illustrates brightness inconsistencies caused by using modules from multiple batches.
3. Abnormal power supply to the LED display.
   • The LED lights used in LED displays are driven by current, and their brightness is closely related to power supply. If the voltage supply to certain modules is insufficient, the brightness of those modules will be darker than others.
   • Insufficient voltage supply may be caused by power supply failure or hardware issues with the module. Testing can be conducted by swapping the power supply and the module to identify the root cause.
4. Different configuration information for the receiver cards used in the LED screen. Different configuration information for the receiver cards in the LED screen includes the following:
   (1) Different information
   (2) Different receiver card configuration files
   (3) Inconsistent receiver card firmware programs
   (4) Different calibration coefficient switch states
   (5) Abnormal calibration coefficients, 等.
   • Certain parameter configurations within the NovaLCT software can affect screen brightness. If the brightness efficiency in the receiver card configuration file differs, the brightness will also be inconsistent.
   • If different configuration parameters are accidentally sent to the LED screen, this will naturally affect brightness consistency. Different brightness efficiencies lead to inconsistent brightness, as shown in the figure below.
5. Newly replaced LED modules and old LED modules have different brightness decay rates, which can result in brightness differences after replacement. This is primarily because new modules have not undergone aging, while old modules have been in use for an extended period.

2. Troubleshooting Methods for LED Screen Brightness Inconsistency

1. Use a multimeter to measure the power supply voltage at the location. If it is abnormal, try replacing the power cable or power supply unit, or replace the spare module at that location.
2. Check and adjust the brightness value of the LED display screen. Send the same receiver card configuration file to all receiver cards to view and upgrade the receiver card firmware program uniformly. Set the calibration coefficient switch to either uniformly enabled or uniformly disabled.
3. Inspect and replace the receiver cards, ensuring that all LED display screens use the same model of receiver card.
4. Use the “Multi-Batch Adjustment” function in the NovaLCT software to improve the performance of different batches of cabinets or modules.
5. Use calibration technology to calibrate the newly replaced modules. In actual troubleshooting practice, careful analysis and patient troubleshooting generally resolve the issues.