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FIDO,


One might think so - that is for a given number of pixels - a larger screen will have fewer pixels per unit area.


However, if the screen is larger - you are looking at it from farther back - so that you see the whole screen.


So in reality - you let the screen fill up your area of vision and that image is composed of the given number

of pixels. What really counts is how many pixels your eyes see - not the density on the screen.
 

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I have seen recommendations for using 200 to 220 pixels per sq inch when sitting at least 1.5x times screen width away.


So e.g. if your projector is 1280x720, you get 921600 pixels. For 220 ppsi, you should have a screen area of 4189 sq inches, which for a 16:9 aspect ratio gives you a screen size of 86" wide, 48" tall and 99" diagonal.


Of course you also need to check if your projector throw distance works for this screen width.
 
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