Why does the LED display have color difference?
Date: June 20, 2019 Source: Tuosheng Optoelectronics
Looking at the color deviation and color between the modules of the LED display module, the display colors are inconsistent. What's wrong? Why is there a color difference in the LED display? The following is an analysis of the reasons for the color cast of the LED display module. After reading these questions, you can solve them.
1. Problems with LED lamps: (including inconsistent chip parameters, defects in encapsulation glue materials, position errors during solid crystal bonding, errors during color separation and color separation, etc.) will affect the emission wavelength, brightness and angle of LED lamps of the same batch. Therefore, there is a very important process for producing LED display screens: mixing lamps. After mixing all the LED lights of the same color, insert them on the PCB. The advantage of this is to avoid partial color cast of the LED module.
2. Production process: After the LED module has been wave soldered, the LED position has been fixed, and it should not be moved at this time. However, because many companies do not have the protection conditions, they often collide and bend the LED lights during the processes of testing, repairing, soldering the headers, aging and transferring. Then the so-called whole line is carried out before the glue is poured, which is easy to cause the lights on the LED screen to be irregularly skewed, resulting in a color cast of the module.
3. Power supply problem: When designing LED display screens, we cannot know what kind of materials to use (including the selection and amount of power supply). Problems in the power supply system lead to uneven power supply in the LED module.
4. Control system and control IC: Because LED display manufacturers do not have the design, development, testing and production capabilities of LED display control systems and control ICs. Of course, the LED display produced cannot be guaranteed, and the only thing that can be done is to adjust the parameters.
Therefore, if the LED display module has a color cast caused by the LED lamp and the production process, the module can only be repaired or replaced. When it is a power supply problem, you need to replace the power lamp. If it is a problem of the control system and IC, the manufacturer can only be asked to repair or solve it.
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