Below is the
sample calculation to calculate the projection screen.
You must
first indentify the furthest
distance of audience. Let says10m.
By using the
aspect ratio of 10/6 (based on AV formats: video or NTSC (4:3), HDTV
(16:9)), you can identify the screen
height.
Screen
Height = 10/6
=
1.67m
=
5.5 ft
=
66 inch
Then, you
need to define the video format screen (assume you using 16:9 format)
Therefore,
screen width = 16/9 x 66 inch
= 117.3 inch @ 2.97m
Based on the
calculation above, the standard projection screen of size: 116" x 65"
is proposed.
Once you have the size of projection screen, you need to determine the projector luminance.
Projector luminance = (Width x Height x Room Lux Level)
/ screen gain
Normally the
screen gain will be unity = 1 and Room Lux Level = 300 lux
Therefore projector luminance =
(2.97m X 1.67m x 300 lux) / 1
=
1487 ANSI Lumens
Therefore the
standard luminance of 2000 ANSI for projector will be proposed.
Below is the
size of projection screen according to their aspect ratio for your reference.
|
Video Format (4:3 Aspect Ratio)
|
||
|
Image Diagonal
|
Image Height
|
Image Width
|
|
60"
|
36"
|
48"
|
|
72"
|
43"
|
57"
|
|
84"
|
50"
|
67"
|
|
96"
|
57"
|
77"
|
|
100"
|
60"
|
80"
|
|
120"
|
69"
|
92"
|
|
150"
|
87"
|
116"
|
|
180"
|
105"
|
140"
|
|
200"
|
120"
|
160"
|
|
210"
|
123"
|
164"
|
|
240"
|
141"
|
188"
|
|
HDTV Format (16:9 Aspect Ratio)
|
||
|
Image Diagonal
|
Image Height
|
Image Width
|
|
92"
|
45"
|
80"
|
|
106"
|
52"
|
92"
|
|
110"
|
54"
|
96"
|
|
119"
|
58"
|
104"
|
|
133"
|
65"
|
116"
|
|
159"
|
78"
|
139"
|
|
188"
|
92"
|
164"
|
|
216"
|
106"
|
188"
|
|
220"
|
108"
|
192"
|
|
AV Format (1:1 Aspect Ratio)
|
||
|
Image Diagonal
|
Image Height
|
Image Width
|
|
71"
|
50"
|
50"
|
|
85"
|
60"
|
60"
|
|
99"
|
70"
|
70"
|
|
108"
|
60" (5')
|
90" (7.5')
|
|
119"
|
84"
|
84"
|
|
120"
|
72" (6')
|
96" (8')
|
|
130"
|
72" (6')
|
108" (9')
|
|
136"
|
96" (8')
|
96" (8')
|
|
151"
|
84" (7')
|
126" (10.5')
|
|
153"
|
108" (9')
|
108" (9')
|
|
170"
|
120" (10')
|
120" (10')
|
|
173"
|
96" (8')
|
144" (12')
|
|
204"
|
144" (12')
|
144" (12')
|
|
238"
|
168" (14')
|
168" (14')
|
|
272"
|
192 (16')
|
192 (16')
|
|
305"
|
216 (18')
|
216 (18')
|
Source: www.da-lite.com
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