1.18” Circular OLED Display 128x128
Model No. WEO128128B
►Circular OLED Display
►Size: 1.18 inch
►128x128 Pixel OLED Module
►Built-in controller SSD1327ZB
►3V Power supply
►Interface: 6800, 8080, SPI, I2C
►Display Color: White / Yellow / Sky Blue (have high MOQ) / Support Grayscale
Winstar OLED WEO128128B is a Circular passive matrix OLED display which is made of 128x128 pixels, diameter 1.18 inch. The WEO128128B has the module dimension of 36.98× 41.23 × 2.05 mm and Active Area size 30.00×30.00 mm; it is built in with SSD1327ZB controller IC and it communicates via 6800/8080 8-bit parallel, I2C and 4-wire SPI serial interface, 3V power supply. The WEO128128B is a COG structure OLED display which is ultra thin and no need of backlight (self emitting); it’s lightweight and low power consumption. This Circular OLED module is suitable for portable instruments, wearable devices, home applications, etc.
WEO128128B 128x128 Pixel OLED Module can be operating at temperatures from -40℃ to 80℃; its storage temperatures range from -40℃ to 80℃. Below is the basic specification of WEO128128B as reference.
Interface Pin Function
|1||VSS||Ground pin. It must be connected to external ground.|
|2||VCC||Power supply for panel driving voltage. This is also the most positive power voltage supply pin. It is supplied by external high voltage source.|
|3||VCOMH||COM signal deselected voltage level.
A capacitor should be connected between this pin and VSS. No external power supply is allowed to connect to this pin.
|4||VCI||Low voltage power supply and power supply for interface logic level. It should match with the MCU interface voltage level and must be connected to external source.
VCI must always set to be equivalent to or higher than VDD.
|5||VDD||Power supply pin for core logic operation.|
|6||BS1||MCU bus interface selection pins. Select appropriate logic setting as described in the following table. BS2 and BS1 are pin select.
Bus Interface selection
Note (1) 0 is connected to VSS (2) 1 is connected to VCI
|8||VSS||Ground pin. It must be connected to external ground.|
|9||IREF||This pin is the segment output current reference pin|
|10||CS#||This pin is the chip select input connecting to the MCU.
The chip is enabled for MCU communication only when CS# is pulled LOW (active LOW).
|11||RES#||This pin is reset signal input.
When the pin is pulled LOW, initialization of the chip is executed.
Keep this pin pull HIGH during normal operation.
|12||D/C||This pin is Data/Command control pin connecting to the MCU.
When the pin is pulled HIGH, the data at D[7:0] will be interpreted as data.
When the pin is pulled LOW, the data at D[7:0] will be transferred to a command register.
In I2C mode, this pin acts as SA0 for slave address selection.
When 3-wire serial interface is selected, this pin must be connected to VSS.
|13||W/R#||This pin is read / write control input pin connecting to the MCU interface.
When 6800 interface mode is selected, this pin will be used as Read/Write (R/W#) selection input. Read mode will be carried out when this pin is pulled HIGH and write mode when LOW.
When 8080 interface mode is selected, this pin will be the Write (WR#) input. Data write operation is initiated when this pin is pulled LOW and the chip is selected.
|14||RD#||This pin is MCU interface input.
When 6800 interface mode is selected, this pin will be used as the Enable (E) signal.
Read/write operation is initiated when this pin is pulled HIGH and the chip is
When 8080 interface mode is selected, this pin receives the Read (RD#) signal. Read operation is initiated when this pin is pulled LOW and the chip is selected.
When serial or I2C interface is selected, this pin must be connected to VSS.
|15||D0||These pins are bi-directional data bus connecting to the MCU data bus.
Unused pins are recommended to tie LOW.
When serial interface mode is selected, D0 will be the serial clock input: SCLK; D1 will be the serial data input: SDIN and D2 should be kept NC.
When I2C mode is selected, D2, D1 should be tied together and serve as SDAout, SDAin in application and D0 is the serial clock input, SCL.
|23||VCC||Power supply for panel driving voltage. This is also the most positive power voltage supply pin. It is supplied by external high voltage source.|
|Dot Matrix||128 × 128||Dots|
|Module dimension||36.98 × 41.23 × 2.05||mm|
|Active Area||30.00 × 30.00||mm|
|Pixel Size||0.210 × 0.210||mm|
|Pixel Pitch||0.235 × 0.235||mm|
|Display Mode||Passive Matrix|
Absolute Maximum Ratings
|Supply Voltage for Operation||VCI||-0.3||4.0||V|
|Supply Voltage for Logic||VDD||-0.5||2.75||V|
|Supply Voltage for Display||VCC||-0.5||19.0||V|
|Supply Voltage for Logic||VCI||Note||2.8||3||3.3||V|
|Supply Voltage for Display||VCC||－||14||14.5||15||V|
|High Level Input||VIH||－||0.8×VCI||－||VCI||V|
|Low Level Input||VIL||－||0||－||0.2×VCI||V|
|High Level Output||VOH||－||0.9×VCI||－||VCI||V|
|Low Level Output||VOL||－||0||－||0.1×VCI||V|
|50% Check Board operating Current||VCC =14.5V||－||24||26||mA|
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