
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