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40930701TH DRAFT Vesion 45 /
The LED driver corrects the LED illumination by controlling the LED current. The LED illumination
can be set in 16 steps, with 7 steps in the direction of illumination increase in relation to the
standard value, and 8 steps in the direction of decrease. For this reason, the LED correction data
is a 4-bit data for each dot.
The relationship between the LED correction data and LED current correction steps with the LED
driver used in an LED head is shown below.
LED Correction Data
Corretion Data
msb b3
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
b2
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
b1
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
lsb b0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Correction
Step
Correction
Mode
+16%
+14%
+12%
+10%
+8%
+6%
+4%
+2%
0%
-2%
-4%
-6%
-8%
-10%
-12%
-14%
↑
↑
↑
↑
↑
↓
↓
↓
↓
Correction by
increasing
illumination
Correction by
decreasing
illumination
No correction