Acer AL1913, Service Manual

Page: 11 / 42

11
Luminance of center point: L=L(5)
Brightness Uniformity Measurement points: Five specified points 1-5
Formula: Maximum [L (1), L (2), L (3), L (4), L (5)]/Minimum [L (1), L (2), L (3), L (4),
L (5)]
(3) Definition of Response Time (T
R
, T
F
):
(4) Measurement Setup:
The LCD module should be stabilized at given temperature for 20 minutes
to avoid abrupt temperature change during measuring. In order to stabilize
the luminance, the measurement should be executed after lighting Backlight
for 20 minutes in a windless room.
100%
90%
10%
0%
Gray Level 255
Gray Level 0
Gray Level 255
Time
T
R
Optical
Response
T
F
Photometer
(TOPCON BM-5A)
Field of View = 2 º
500 mm
LCD Module
LCD Panel
Center of the Screen
Light Shield Room
(Ambient Luminance < 2 lux)