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4.When there are a few black spots, white spots, stains and other impurities on the screen surface, but if they are
qualified according to the detection method, then such situation is not a product quality problem, and it is
within the scope of product qualification.
3m
Figure 2 top view
1m
1m
screen
3m
Figure 1 side view
The ambient illumination of the
central point is 500-600lx
The center of the screen
45°
Horizontal line of sight
As long as the test results of the product are within the allowable range, the product is qualified.
(3).The distance between the observer and the front of the screen should be kept at a distance of 3 meters , and
the center point of the screen should be close to or higher than the horizontal line of sight (as shown in Figure
1), and the observation should be made at the center point, 1 m to the left and 1 m to the right (as shown in
Fig. 2).
The detection method is as follows:
(2).The observer needs to observe the shadow in the normal light environment (illumination 500-600lx);
(1).Please raise the screen of this product and close to the wall, and the observer can observe the film at a
distance of 3 meters away from the screen;
screen
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