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Procedure:
A. Black Level Adjustment: (DLP brightness)
1. Change pattern of pattern generator :
Pattern : Black (Gray 0)
2. Adjust DLP Brightness to let the black picture to just distinguish.
B. White Level Adjustment: (AD contrast---R,G,B gain)
1. Change pattern of pattern generator :
pattern : White (100% Gray)
2. Use Lux meter to measure the white level. Adjust the contrast value of AD9883 (RGB)
to let the light output to just max.
3. Change to 32-gray (0 ~ 100%) pattern. All steps must appear,
C. Offset adjustment at low brightness (AD R, G, B offset)
1. Change Timing and pattern of pattern generator :
pattern : 10% Gray
2. Set user color temp to 6500K.
3. Adjust AD9883 Red and Blue Offset to meet 6500K color spec.
D. Color Temperature at high brightness (Scalar Gamma R, G, B Gain)
1. Change Timing and pattern of pattern generator :
Timing : 800x600@60Hz (H:37.879Khz,V:60.317Hz)
Pattern : 80% gray
2 Color temperature spec: CIE 1976 u’, v’ chromaticity)
Color temperature
5400°K 6500°K 7500°K
364818
27
''
'
−
=
vu
u
x
0.333 0.312 0.296
364818
12
''
'
+−
=
vu
v
y
0.333 0.329 0.316
3122
4
'
++−
=
yx
x
u
0.210 0.197 0.190
3122
9
'
++−
=
yx
y
v
0.473 0.468 0.459
Deviation:
u’v’=
2
'
2
'
( vu ∆+∆
<=0.010 <=0.010 <=0.010
Color Temp 4 = color temp is the same as that of 6500K
