SSD1322 SOLOMON SYSTECH, SSD1322 Datasheet - Page 27

• Manufacturer Part Number: SSD1322
• Description: Dot Matrix High Power OLED/PLED Segment/Common Driver
• Manufacturer: SOLOMON SYSTECH

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In phase 2, first pre-charge is performed. The pixel is driven to attain the corresponding voltage level V
V
programmed by command B1h A[7:4]. If the capacitance value of the pixel of OLED panel is larger, a longer
period is required to charge up the capacitor to reach the desired voltage.
In phase 3, the OLED pixel is driven to the targeted driving voltage through second pre-charge. The second
pre-charge can control the speed of the charging process. The period of phase 3 can be programmed by
command
Last phase (phase 4) is current drive stage. The current source in the segment driver delivers constant current
to the pixel. The driver IC employs PWM (Pulse Width Modulation) method to control the gray scale of each
pixel individually. The gray scale can be programmed into different Gamma settings by command B8h/B9h.
The bigger gamma setting (the wider pulse widths) in the current drive stage results in brighter pixels and vice
versa (details refer to Section 8.8). This is shown in the following figure.
After finishing phase 4, the driver IC will go back to phase 1 to display the next row image data. This four-
step cycle is run continuously to refresh image display on OLED panel.
The length of phase 4 is defined by command B8h or B9h. In the table, the gray scale is defined in
incremental way, with reference to the length of previous table entry.
SSD1322
LSS
Segment
Voltage
. The amplitude of V
V
V
P
LSS
B6
h.
Rev 0.10
Phase1
Phase2
P 27/56 Apr 2008
P
Figure 8-12 : Gray Scale Control by PWM in Segment
can be programmed by the command BBh. The period of phase 2 can be
Phase3
Phase4
OLED
Panel
drives pixel brighter
Wider pulse width
Solomon Systech
P
from
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