Acer AL1717EE Service Manual page 12

L
W
0.1 D
Luminance is measured at the center measurement position "C" on the
LCD panel. The optical axis of the luminance meter shall be aligned with
the normal of the panel surface. The measuring distance between the
photometer and the surface of the panel is defined as:
Md (cm) = diagonal of the panel (cm) X 1.5
The panel is rotated around a vertical axis which passes the center of
the display by changing the azimuthal angle to +30°. The distance
between the panel and the photometer remains unchanged and the
measured point is exact the same as the previous measured point.
The photometer is then rotated by changing its azimuthal angle with the
fixed distance to the panel. Luminance at points "L" and "R" are given:
L
min, +30
30°
LCD panel
C
L
The LCD panel is then rotated to another azimuthal angle to -30°; and
° and L
L
min, -30 max, -30
The Luminance Uniformity (L
L = ((L
R
max, +30
D/2
C
D
cm.
° and L
max, +30
°
L
R
min, +30
°
L
max, +30
° are obtained by using the same procedure.
) is calculated as follow:
R
°/ L °)+( L
min, +30 max, -30
12
W/2
R
W/2
0.1 D
with minimum distance 50
°
Photometer
°/ L °)) / 2.
min, -30