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About the reason why the display looks slightly tilted after Keystone adjustment, we would like to share the following with you:
The main reason is due to an optical illusion caused by the size and shape difference between the dark zone and the image on the screen.
When seeing such a shape difference, the human brain interprets visual information in a way that differs from the actual physical reality. These illusions can create images that deceive our perception, leading us to see things that aren't there and misinterpret sizes.
To avoid the issue, we would suggest focusing only on the displayed image and confirming that the image is square by measuring the length of the sides and making sure they are about the same.
If the length difference is considerable, please let us know.
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