SSD1306Z datasheet(24/65 Pages) ETC2

24 / 65 page

Solomon Systech

Apr 2008 P 24/59

Rev 1.1

SSD1306

8.6

Segment Drivers / Common Drivers

Segment drivers deliver 128 current sources to drive the OLED panel. The driving current can be adjusted

from 0 to 100uA with 256 steps. Common drivers generate voltage-scanning pulses.

The segment driving waveform is divided into three phases:

1. In phase 1, the OLED pixel charges of previous image are discharged in order to prepare for next

image content display.

2. In phase 2, the OLED pixel is driven to the targeted voltage. The pixel is driven to attain the

corresponding voltage level from VSS. The period of phase 2 can be programmed in length from 1 to

15 DCLKs. 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.

3. In phase 3, the OLED driver switches to use current source to drive the OLED pixels and this is the

current drive stage.

Figure 8-12 : Segment Output Waveform in three phases

After finishing phase 3, the driver IC will go back to phase 1 to display the next row image data. This three-

step cycle is run continuously to refresh image display on OLED panel.

In phase 3, if the length of current drive pulse width is set to 50, after finishing 50 DCLKs in current drive

phase, the driver IC will go back to phase 1 for next row display.

Segment

VSS

Phase: 1 2

Time

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