Round OLED Display Module with Touch Screen - REX128128D-CTP

Round OLED Display Module with Touch Screen 1.18-inch 128x128 COG (SSD1327 IC)

Model No. REX128128D-CTP

The REX128128D-CTP is a 1.18-inch 128×128 COG round OLED display module, designed as a compact and stylish round OLED display solution. This round OLED features a capacitive touch panel (CTP) with 4-bit grayscale support, delivering smooth tonal rendering and sharp monochrome visuals. Powered by the FT3268 IC, the CTP enables intuitive and responsive round touch screen interaction. Available in white and yellow emitting colors, this OLED round module ensures excellent readability and a sleek design that fits modern product requirements.

With its compact dimensions (Ø50.5 × 5.0 mm), wide operating temperature range (-20°C to +70°C), and flexible interfaces (4-line SPI / I²C), the REX128128D-CTP is a reliable round OLED display module for diverse applications. It is especially well-suited for smart kitchen devices, home appliances, wearables, and handheld innovations, where both performance and aesthetics are essential.

If you need technical support or product quotes for the REX128128D-CTP or other round touch OLED display modules, please feel free to contact our sales team!

★Support Grayscale

Data Source Ref: REX128128DWPP3L00003

Inquiry or Demo Code

Datasheet

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Item	Dimension	Unit
Structure	COG
Size (Diagonal)	1.18	inch
Dot Matrix / Resolution	128 × 128	dots
Module Dimension	Ø50.5 × 5.0	mm
Viewing Area	Ø31.0	mm
Active Area	Ø30.0	mm
Dot / Pixel Size	0.210 × 0.210	mm
Dot / Pixel Pitch	0.235 × 0.235	mm
Emitting Color	OLED, Yellow / White
Support Grayscale	Yes
Display Mode	Passive Matrix
Gray Scale	4-bit
IC	SSD1327
Interface	4-line SPI / I2C
PCAP IC	FT3268
PCAP Interface	I2C
Detect Points	1	Points
Touch Panel	Capacitive Touch Panel
Power Supply	3V
Duty	1/128 duty
Operating Temperature	-20~+70	°C
Storage Temperature	-30~+70	°C
Polarizer Type	Polarizer Optional
Type	OLED Graphic Display, OLED Touch Display

Interfaces of REX128128D-CTP Round OLED Display

Pin No.

Symbol

Function

VSS

Ground pin. It must be connected to external ground.

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.

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.

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.

VDD

Power supply pin for core logic operation.
VDD can be supplied externally (within the range of 2.4V to 2.6V) or regulated
Internally from VCI. A capacitor should be connected between VDD and VSS under all circumstances.

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

IREF

This pin is the segment output current reference pin

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).

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.

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.

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.

TP_SCK

I2C clock signal

TP_SDA

I2C data signal

TP_INT

Interrupt signal

VCC

Power supply for panel driving voltage. This is also the most positive power voltage supply pin.

VSS

Ground

Round OLED Display Module,Round OLED,Round Touch Screen - REX128128D-CTP Contour Drawing

Operating Limits of REX128128D-CTP

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	+70	°C
Storage Temperature	TSTG	-30	+70	°C

DC Electrical Characteristics

Item	Symbol	Condition	Min	Typ	Max	Unit
Supply Voltage for Operation	VCI	－	2.8	3.0	3.3	V
Supply Voltage for Display	VCC	－	8.0	14.5	15.0	V
Supply Voltage for Logic	VDD	－	1.65	－	2.6	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	－	15	30	mA

Touch Panel Controller FT3268

Item	Symbol	Condition	Min	Typ	Max	Unit
Input High Volt	VIH	－	0.7×VDD	－	VDD	V
Input Low Volt	VIL	－	-0.3	－	0.3×VDD	V
Output High Volt	VOH	IOH = 0.1mA	0.7×VDD	－	－	V
Output Low Volt	VOL	IOL = 0.1mA	－	－	0.3×VDD	V