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For the black spot defect which can be
measured in appearance, if it can not be
found by visual inspection, the product is
normal.
F o r t h e a p p e a r a n c e o f s p e c i fi c
measurable white spot defects, if visual
inspection can not be found, then the
product is normal.
If the visible dirt is within the allowable
range of defects, the product is normal.
For the faint linear printing trace, if within
the allowable range of defects, the
product is normal.
For the inks caused by uneven printing
traces, if within the allowable range of
defects, the product is normal.
(2).Different from the white screen, the black screen is used as a functional surface to absorb indoor ambient
light. In view of the fact that there is no direct correlation between the black screen surface and the image
viewing quality, its quality specifications are quite different from that of the white surface. It should be noted
that the slight black marks on the black screen surface are inevitable appearance phenomena in the
production process of industrial products, which meet the factory qualification standard.
(1).The white screen is listed as the quality standard because it is not only the reflection surface of the projector
image (the black surface is observed from the upper and lower direction, and the white surface is observed
from the bottom direction), but also the main function surface of the viewing image, so the white screen is
listed as the quality standard. It should be noted that if the white screen surface does not exceed the quality
specification, it will be regarded as meeting the factory qualification standard.
Conclusion: it should be noted that the slight black marks and white spots on the black screen surface of the anti
light projection screen products are normal product appearance phenomena, which will never affect the
image viewing quality. Please use it at ease.
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