Factory Test & Alignment Specification For MT56-AP Series (V1.0)
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Appendix 4: White Balance (WB) Adjustment
The White Balance generally is customized by PQ engineer, and uploaded to the PDM system, anyone
else shouldn’t change the value in the menu. If it is necessary to adjust, the following content can offer
some reference, but the process of adjusting White Balance is out of the range of this file. Please refer to
the relevant technical file of HuiZhou factory of TCL.
Calibration of Color Temperature
According to TCL standards, the color temperature and white reference coordinates of LCD like the
following table: (This standard is based on CA-310 color temperature meter)
Product
type
Color
temperature
state
Color
temperature
chromaticity coordinate
tolerance
（
X,Y
）
X
Y
LCD
cold
13000K
0.270
0.270
±0.015
normal
10000K
0.280
0.290
warm
7500K
0.300
0.305
White balance adjustment takes the
Normal
color temperature of HDMI channel as the reference.
Warm
and
Cold
tone is relative to
Normal
mode. The adjustable gain range is 0~255.
The
Normal
color temperature of other channel is relative to the
Normal
mode of
HDMI
channel. The
adjustable gain range is also 0~255.
The manual adjustment is according to the regulation above. Additionally, when manually adjust, it
needs to do
White Balance init
first.
Take signal generator 22293 as an example, the timing value and pattern value of each source show in
the following table:
source
HDMI
VGA
AV/ATV
CMP
Timing value
69
14
38
79
Pattern value
103
103
103
103
Note: 1) The input signal is 80% white when the pattern value of 22293 is 103.
2) The adjustment of White Balance should fulfill TCL matching specification.
