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Note (6) Definition of TCO 99 Luminance Contrast (Angular-dependent) (Cm):
W
Luminance contrast is measured at the center point of the LCD panel
"C" along with the normal of the display with the same distance described
in Note 13. The display is then rotated around the vertical axis by
changing its azimuthal axis to +30°; and this gives:
LCD panel
The LCD panel is then rotated to azimuthal angle to -30°; and L
° and L
30
255 G.L., -30
Luminance Contrast (Cm) is calculated:
For both +30° and -30°. The lower value for Cm is reported.
° and L
L
255
G.L., +30
30°
C
° are obtained by using the same procedure. The
-
Cm = (L
L
255 G. L.
0 G.L.
13
D/2
C
D
°.
0 G.L., +30
Photometer
+
)/ (L
L
)
255 G. L.
0 G.L
W/2
W/2
0 G. L., -
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