Home Products OLED Module Graphic OLED Display WEO128128D-CTP

1.18" 128x128 Round OLED Display Module with Touch Screen

Model No. WEO128128D-CTP

►Type: Graphic
►Structure: COG
►Size: 1.18 inch
►128 x 128 Dot Matrix
►Built-in controller SSD1327
►3V Power supply
►1/128 duty
►Interface: SPI, I2C
►Capacitive touch screen
►Display Color: White / Yellow / Sky Blue (have high MOQ) / Support Grayscale


WEO128128D-CTP is an Ø1.18” circular graphic OLED display; with capacitive touch screen on module; made of resolution 128x128 dots. This module is built in with SSD1327 IC, it supports 4-line SPI and I2C interface, supply voltage for logic 3V (typical value), 1/128 driving duty. This WEO128128D-CTP model is built in with IT7259 touch panel IC on module, which supports I2C interface, one detect point for capacitive touch screen.

This round OLED WEO128128D with CTP model is ideal for smart home applications, intelligent technology devices, energy systems, communication systems, medical instrument, etc. This module can be operating at temperatures from -20℃ to +50℃; its storage temperatures range from -30℃ to +70℃.



1.18" 128x128 Round OLED Display Module with Touch Screen - WEO128128D-CTP
Data source ref: WEO128128DWPP3D00001


Interface Pin Function

No. Symbol 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. BS1 is pin select.
Bus Interface selection
BS1 Interface
0 4-line SPI
1 I2C
Note  (1) 0 is connected to VSS  (2) 1 is connected to VCI
7 IREF This pin is the segment output current reference pin
8 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).
9 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.
10 DC# This pin is Data/Command control pin connecting to the MCU.
When the pin is pulled HIGH, will be interpreted as data.
When the pin is pulled LOW, will be transferred to a command register
In I2C mode, this pin acts as SA0 for slave address selection.
11 D0 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.
12 D1
13 D2
14 TP_SCK I2C clock signal
15 TP_SDA I2C data signal
16 TP_INT Interrupt signal
17 VCC Power supply for panel driving voltage. This is also the most positive power voltage supply pin.
18 VSS Ground

Mechanical Data

Item Dimension Unit
Dot Matrix 128 × 128 Dots
Module dimension Ø50.5 × 5.0 mm
Active Area Ø30.0 mm
Pixel Size 0.210 × 0.210 mm
Pixel Pitch 0.235 × 0.235 mm
Display Mode Passive Matrix
Display Color Monochrome
Drive Duty 1/128Duty
Gray Scale 4 bits
IC SSD1327
Interface 4-line SPI , I2C
Size 1.18 inch
Detect Point 1
PCAP Interface I2C
PCAP Surface Hardness 6H

Absolute Maximum Ratings

Parameter Symbol Min Max Unit
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
Operating Temperature TOP -20 +50 °C
Storage Temperature TSTG -30 +70 °C

Electronical Characteristics

DC Electrical Characteristics

Item Symbol Condition Min Typ Max Unit
Supply Voltage for Logic VCI 2.8 3.0 3.3 V
Supply Voltage for Display VCC 14.0 14.5 15.0 V
High Level Input VIH 0.8×VCI VCI V
Low Level Input VIL 0 0.2×VCI V
High Level Output VOH Iout = 100uA 0.9×VCI VCI V
Low Level Output VOL Iout = 100uA 0 0.1×VCI V
50% Check Board operating Current VCC =14.5V 24 36 mA


Touch Panel Controller IT7259

Item Symbol Condition Min Typ Max Unit
Input High Volt. VIH COMS 1.2 V
Input Low Volt. VIL COMS 0.5 V
Output High Volt. VOH IOH = 2mA 2.4 V
Output Low Volt. VOL IOL = 2mA 0.4 V

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