NEC Display Solutions of America, Inc.
P474W/P474U/P554W/P554U Installation Guide
Desktop and Ceiling Mount
Rev 1.0
www.necdisplay.com
P474W/P474U/P554W/P554U
Page 3 of 9
Formulas: 16:10 Aspect Ratio (P474U/P554U
—WUXGA)
The Projection Formulas use the image width for calculation. Image width is the same for all aspect ratios, only vertical image size
varies. For proper projector placement, determine the image width for a desired screen size. Use the Screen Formulas below to
calculate all screen dimensions. Plug in the image width for “W” in the Projection Formulas.
Refer to the diagrams and charts for popular screen sizes on page 4:
16:10 Screen Formulas:
W = H x 16/10
H = W x 10/16
Screen Diagonal = W x 18.868/16
Projection Formulas:
B
(max) = 0.347W
B (min) = 0
C
(wide) = 1.238W
– 1.818
C
(tele)
= 1.999W
– 1.727
D
(max) = -0.053W
D
(min) = 0.313W
α
(wide) =
tanˉ¹ (B/C(wide))
α
(tele) =
tanˉ¹ (B/C(tele))
Lens Shift Max (Right) = 0.15W
Lens Shift Max (Left) = 0.-15W
Note:
For screen sizes not indicated on the projection
tables, use the formulas on page 1.
Distance Charts
The following shows the proper relative positions of the projector and screen. Refer to the table to determine the position of installation.
Distances are in inches. For millimeters multiply by 25.4.
Diagonal Width(W) Height (H)
Max
(Right)
Max
(Left)
inches
inches
inches
57
48
30
17
-
0
58
-
94
-2
-
15
16.1
-
10.0
7.2
-
-7.2
66
56
35
19
-
0
68
-
110
-2
-
18
16.1
-
10.0
8
-
-8
68
58
36
20
-
0
69
-
113
-2
-
18
16.0
-
10.0
9
-
-9
75
64
40
22
-
0
77
-
126
-2
-
20
16.0
-
10.0
10
-
-10
79
67
42
23
-
0
81
-
133
-2
-
21
16.0
-
10.0
10
-
-10
85
72
45
25
-
0
87
-
142
-3
-
23
16.0
-
10.0
11
-
-11
92
78
49
27
-
0
95
-
155
-3
-
25
15.9
-
10.0
12
-
-12
98
83
52
29
-
0
101
-
165
-3
-
26
15.9
-
9.9
12
-
-12
102
86
54
30
-
0
105
-
171
-3
-
27
15.9
-
9.9
13
-
-13
111
94
59
33
-
0
115
-
187
-3
-
30
15.9
-
9.9
14
-
-14
113
96
60
33
-
0
117
-
190
-3
-
30
15.9
-
9.9
14
-
-14
123
104
65
36
-
0
127
-
206
-4
-
33
15.9
-
9.9
16
-
-16
125
106
66
37
-
0
129
-
209
-4
-
33
15.9
-
9.9
16
-
-16
147
125
78
43
-
0
153
-
248
-4
-
39
15.8
-
9.9
19
-
-19
149
126
79
44
-
0
155
-
251
-4
-
40
15.8
-
9.9
19
-
-19
213
181
113
63
-
0
222
-
360
-6
-
57
15.8
-
9.9
27
-
-27
255
216
135
75
-
0
266
-
430
-8
-
68
15.8
-
9.9
32
-
-32
270
229
143
79
-
0
281
-
456
-8
-
72
15.8
-
9.9
34
-
-34
300
254
159
88
-
0
313
-
507
-9
-
80
15.7
-
9.9
38
-
-38
degrees
inches
D
max - min
Lens Shift
α
w ide - tele
B
max - min
inches
Screen Size (16:10)
inches
C
w ide - tele
inches
