NEC Display Solutions of America, Inc.
VE303/VE303X Installation Guide
Ceiling and Desktop Mounted
Rev 1.0
www.necdisplay.com
VE303/VE303X
Page 2 of 6
Formulas
The Projection Formulas use the image width for calculation. For proper projection placement, determine the image width
for the desired screen size. Use the Screen Formulas below to calculate all screen dimensions. Plug in the width for “W” in
the Projection Formulas.
Refer to the diagrams and charts below for popular screen sizes:
Definitions:
4:3 Screen Formulas:
W = Image Width
W = H x 4/3
H = Image Height (size)
H = W x 3/4
B = Vertical distance between lens center and screen center
Screen Diagonal = W x 5/4
C = Throw distance
D = Vertical distance between lens center and screen top
(screen bottom for desktop application)
Projection Formulas:
B
= 0.487W
C
(wide) = 1.95W
C
(tele)
= 2.150W
D
= 0.112W
α
(wide) = tanˉ¹ (B/C(wide))
α
(tele) = tanˉ¹ (B/C(tele))
Distance Chart for popular 4:3 screens
.
Note:
For screen sizes not indicated on the projection tables, use the formulas on above
Diagonal Width(W) Height (H)
inches
inches
inches
inches
30
24
18
12
47
-
52
14.0 -
12.8
60
48
36
23
94
-
103
14.0 -
12.8
67
53.6
40.2
26
105
-
115
14.0 -
12.8
72
57.6
43.2
28
112
-
124
14.0 -
12.8
84
67.2
50.4
33
131
-
144
14.0 -
12.8
90
72
54
35
140
-
155
14.0 -
12.8
100
80
60
39
156
-
172
14.0 -
12.8
120
96
72
47
187
-
206
14.0 -
12.8
150
120
90
58
234
-
258
14.0 -
12.8
180
144
108
70
281
-
310
14.0 -
12.8
210
168
126
82
328
-
361
14.0 -
12.8
240
192
144
94
374
-
413
14.0 -
12.8
270
216
162
105
421
-
464
14.0 -
12.8
300
240
180
117
468
-
516
14.0 -
12.8
Screen Size (4:3)
5
inches
3
B
C
w ide - tele
inches
6
6
8
8
D
α
w ide - tele
degrees
19
22
24
27
9
11
13
16
