Akai LCT42HA36 Service Manual page 94

Note :
1. Contrast Ratio(CR) is defined mathematically as :
Contrast Ratio =
It is measured at center 1-point.
2. Surface luminance is the luminance value at center 1-point across the LCD surface 50cm from the
surface with all pixels displaying white. For more information see the FIG. 2.
3. The variation in surface luminance , δ WHITE is defined as :
δ WHITE(5P) = Maximum(L
Where L to L
on1
For more information, see the FIG. 2.
4. Response time is the time required for the display to transition from G(N) to G(M) (Rise Time, Tr
and from G(M) to G(N) (Decay Time, Tr
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. Gray scale specification
Gamma Value is approximately 2.2. For more information, see the Table 14.
Table 14. GRAY SCALE SPECIFICATION
Gray Level
L0
L15
L31
L47
L63
L79
L95
L111
L127
L143
L159
L175
L191
L207
L223
L239
L255
Ver. 1.0
Product Specification
Surface Luminance with all white pixels
Surface Luminance with all black pixels
,L , L
on1 on2
are the luminance with all pixels displaying white at 5 locations .
on5
Luminance [%] (Typ)
0.11
0.19
1.08
2.07
4.51
7.75
12.05
17.06
22.36
28.21
35.56
43.96
53.00
63.37
74.66
88.17
100
, L , L ) / Minimum(L
on3 on4 on5
). For additional information see the FIG. 3. (N<M)
D
92／125
Liquid Crystal Display
,L , L , L , L
on1 on2 on3 on4 on5
Luminance [%] (Typ) with DCR
0.06
0.16
0.63
1.68
3.54
6.41
10.82
16.74
22.00
27.44
34.62
42.94
51.94
62.25
73.66
87.05
100
LC420W02
)
)
R