White Balance - Acer B223W Service Manual

Acer
On Load Function:
Item Symbol
Input Current I
in
Frequency F
Output Current for
I
L
One Lamp
Operating Voltage Vo
Brightness PWM
duty
Kick Off Voltage
T
Hold Up Time
η
Efficiency
3.3 Brightness output
The test to verify specifications in this section shall be performed under the following standard conditions unless
otherwise noted.
Temperature
Test pattern
Video Resolution
Video input level
Warm-up time
Set brightness control and also contrast control at maximum, to measure the screen center, the light output
2
shall ≥ 250 cd/m

3.4 White balance

The test standard conditions refer to Sec 3.3.(Brightness control is at 100 contrast control is at 50 )
Mode
Cool
Warm
User
3.5 Brightness uniformity
The test standard conditions refer to Sec 3.4.
Min. luminance
Max. luminance
Min. Typ.
--- 1.8
40.0 45.0
3.0 7.0
--- 750
35% ---
1.0 1.5
75% ---
: 25 ± 5°C
: white
: 1680 x 1050
: 700 mV ± 2%
: 30 minutes
(as panel spec)
Chromaticity Coordinate
x
9300K 0.283 ± 0.030
6500K 0.313 ± 0.030
Panel While x
of nine points (backlight )
of nine points (backlight )
Max. Unit
2.2 A
80 kHz
8.0 mArms
--- Vrms
100%
--- S
---
y
0.297 ± 0.030
0.329 ± 0.030
Panel While y
≥ 75
%
6
Acer –LCD-B223W
Remark
@Max-Load
PWM dimming control
mode: 2mA≤I ≤8mA
L
@Vin=16.0V
Brightness=3.3V
@Vin=16.0V
Brightness=3.3V