The quality of construction
From the moment that one opens the box and unpack the material of the screen you are buying, it is obvious that there are significant differences between the vendors of materials and running, attention to detail and quality of the product. Anyway, although these differences are present should be noted, once the screens are assembled and mounted, the quality of its structure becomes the second level of image quality that delivers.
On the other hand, if you plan to install a screen with electric motor to get the movement and systems, the quality of construction remains a major issue for the life of the display. The mechanical precision, long-term wear and maintenance is much more significant factor for purchase displays with moving parts that with fixed installations. This review is limited to the manufacture of the screen and their behavior with the image, do not include any kind of support systems for mounting a screen.
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