Akai LCT42Z6TM, Service Manual

Page: 59 / 78

Product Specification
18 / 30
LC420WU1
Liquid Crystal Display
Ver. 1.0 July. 22, 2005
Note :
1. Contrast Ratio(CR) is defined mathematically as :
Surface Luminance with all white pixels
Contrast Ratio =
Surface Luminance with all black pixels
Measure Position : Center 1-point
2. Surface Luminance(
L
WH
) is the luminance value measured at an approximate 50cm distance from
the center 1-point of LCD surface as all pixels displaying white. See FIG. 2 for more information.
3. The variation of surface luminance ,
δ
WHITE is defined as :
δ
WHITE(5P) = Maximum(L
on1
,L
on2
, L
on3
, L
on4
, L
on5
) / Minimum(L
on1
,L
on2
, L
on3
, L
on4
, L
on5
)
Where L
on1
to L
on5
are the luminance with all pixels displaying white at 5 locations .
For more information, see the FIG. 2.
4. Response time is defined as the required time for the transition from G(N) to G(M) (Rise Time, Tr
R
)
and from G(M) to G(N) (Decay Time, Tr
D
). For additional information see the FIG. 3. (N<M)
5. Viewing angle is the angle at which the contrast ratio is greater than 10. The angles are
determined for the horizontal or x axis and the vertical or y axis with respect to the z axis which
is normal to the LCD module surface. For more information, see the FIG. 4.
6. See Table 14 for gray scale specification
7. Black Level and Black Uniformity :
This is only for the reference. Please refer to attached Appendix B for the details.
Gray Level Luminance [%] (Typ.) Luminance [%] (Typ.) with DCR
L0 0.19
0.39
1.16
2.61
4.80
7.77
11.56
16.21
21.73
28.15
35.50
43.79
53.04
63.28
74.50
86.74
100
L15
0.06
0.24
0.82
1.90
3.64
6.37
9.77
13.9
18.5
24.0
31.1
38.1
46.7
56.9
69.5
83.8
L31
L47
L63
L79
L95
L111
L127
L143
L159
L175
L191
L207
L239
L255 100
L223
Table 14. GRAY SCALE SPECIFICATION