As you could see, there is color difference on some led screen which block visual feast, but why there is color difference on led screen? According to our nine years’ manufacturing experience, here i would like to share our analyze and solution to solve this problem:
Factors lead to color difference:
- led chip
In the production of led chip, it is hard to make sure all led chip is exact same on characters even though in the same batch, but manufacturer will classify different levels of led according to brightness, the more closer brightness between the two levers, the better consistency of led, manufacturer usually control 20% more or less between each two levels.
- driver ic
Led screen adopt constant current ic, these driver ic has 16 output of current, the current is controlled by resistance, for same ic, the error needs to be controlled within 3%, for different ic on the same led screen, the error needs to be controlled in 6%. It is normal to have 25% brightness difference on pixels of led screen, but if led chip is not from same level, then the brightness error will reach 40%.
Brightness difference will cause mosaic phenomenon. So how to solve this, here are two tips for your reference:
control the current of led about 20am on each led then it improve the stability
Make use of human being’s visual character, improve the fresh rate then eyes could feel the led pixel is