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Method of determining screen size
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Horizontal viewable range (half-angle gain)
Depending on the reflection characteristics, the visible range in the horizontal direction also varies greatly. Although it is also called the viewing angle, the screen visible range usually represents the angular range of the brightness of 1/2 of the maximum screen gain. Due to the difference between the incident angle and the viewing position of the projector, there is a case where the characteristics of the screen cannot be exerted.
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