What size screen is right? 1 picture tells you
What size screen is right?
Projector optimal projection distance
80 inches is about 2.9-3.4 meters!
120 inches is probably between 4.4-5.0!
When purchasing a projector, we first notice the important parameters such as brightness, resolution, contrast, and uniformity of the projector. In addition, we must also figure out the parameters such as the focal length of the projector and the size of the liquid crystal, so as to be at the projection distance and The screen size is suitable for our use. The projection distance and screen size are closely related to the focal length of the projector and the size of the LCD. The relationship is as follows:
Know the screen size to get the projection distance:
Minimum projection distance (m) = minimum focal length (m) x screen size (inches) ÷ LCD size (inches)
Maximum projection distance (m) = maximum focal length (m) x screen size (inches) ÷ LCD size (inches)
The projection distance is known to get the screen size:
Maximum projection screen (m) = projection distance (m) x LCD size (inches) ÷ minimum focal length (m)
Minimum projection screen (m) = projection distance (m) x LCD size (inches) ÷ maximum focal length (m)
E.g:
1. The focal length of the Toshiba TLP-S71 is 26.5mm~31.5mm. The size of the LCD is 0.7-inch LCD panel, which requires an 85-inch screen.
Minimum projection distance (m) = 0.0265 m x 85 inches ÷ 0.7 inches = 3.217 m
The maximum projection distance (m) = 0.0315 m x 85 inches ÷ 0.7 inches = 3.825 m
2. It is known that the focal length of EPSONEMP-6000 is 24.0-38.2mm, the size of the LCD is 0.8 inch LCD panel, and the projection distance is 4 meters. The maximum projection screen and the smallest projection screen are required.
Maximum projection screen (inches) = 4 meters x 0.8 inches ÷ 0.024 meters = 133.3 inches
Minimum projection screen (inches) = 4 m x 0.8 inches ÷ 0.0382 m = 83 inches
As mentioned above, the projection screen size, we need to select the projection screen size according to the projection screen size. The screen size we are talking about is actually the length of the screen diagonal, in inches. Generally, the scale of China is meter, and the length and the section are convenient, so it is necessary to know the screen width (meter) and screen height (meter) according to the screen size (inches).
Length unit conversion formula: 1 inch = 2.54 cm = 0.0254 m
The ratio of the width and height of a normal screen is 4:3, so it is obtained by the Pythagorean theorem:
Screen width (m) = screen size (inches) x 0.0254 m / inch x 0.8 = screen size ÷ 50
Screen height (m) = screen size (inches) x 0.0254 m / inch x 0.6 = screen size ÷ 66
The unit obtained is meters
According to this formula:
The width of a 60-inch screen is 60÷50=1.2 (m) and the height is 60÷66=0.909 (m)
The width of a 150-inch screen is 150÷50=3 (m) and the height is 150÷66=2.27 (m)
The 200-inch screen has a width of 200 ÷ 50 = 4 (meters) and a height of 200 ÷ 66 = 3 (meters).
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