Original link: http://loonlog.com/2023/7/5/throw-rtatio-and-projection-screen-size/
Throw ratio:
The throw ratio is the ratio of the projection distance to the screen width.
That is: throw ratio = projection distance / screen width
Under the premise of the same position, the smaller the ratio, the larger the projection screen.
This is an important parameter that must be considered when purchasing a projector. It is limited by the size of the curtain or wall and the fixed position of the projector. The popular point is the size of the living room.
At present, the common intelligent projection on the market has a fixed throw ratio of 1.2, and the projection of a 100-inch screen requires a position of about 3 meters. This is the size available in most rooms. There are also zoom lenses, usually between 1.2-1.5, and even 1.9. At present, this type of projection is called a telephoto projector. When the throw ratio is less than 1, we usually call it a short-throw projector; and when the throw ratio reaches below 0.4, we usually call it an ultra-short-throw projector.
Projection size:
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