REX012832S - Graphic OLED Display Module

0.91-inch 128x32 COG Graphic OLED Display Module (CH1120 IC)

Model No. REX012832S

The REX012832S is a 0.91-inch 128×32 COG (Chip-on-Glass) Graphic OLED Display Module powered by the CH1120 IC. Designed for compact applications, it features an active area of 22.38×5.58 mm within a slim 30.0×11.5×1.41 mm outline. Supporting both 4-wire SPI and I²C interfaces, this monochrome OLED delivers crisp, high-contrast visuals with 4-bit grayscale performance.

Its wide operating temperature range from -40°C to +80°C ensures outstanding durability and readability even in harsh industrial environments. With a typical 9 V display voltage and low power consumption, the REX012832S provides stable performance for portable instruments, wearable devices, and compact embedded systems.

Discover more REX012832S or contact our sales team to find the perfect display solution for your next project.

If you need a model with a COG+PCB version, you can refer to REA012832S.

Data Source Ref: REX012832SWPP3N00000

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Datasheet

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General Specs
Interface Pin Function
Contour Drawing
Absolute Maximum Ratings
Electrical Characteristics

Item	Dimension	Unit
Structure	COG
Size (Diagonal)	0.91	inch
Dot Matrix / Resolution	128 × 32	dots
Module Dimension	30.0 × 11.5 × 1.41	mm
Viewing Area	24.38 × 7.58	mm
Active Area	22.38 × 5.58	mm
Dot / Pixel Size	0.155 × 0.155	mm
Dot / Pixel Pitch	0.175 × 0.175	mm
Emitting Color	OLED, Yellow / White
Support Grayscale	Yes
Display Mode	Passive Matrix
Gray Scale	4-bit
IC	CH1120
Interface	4-Wire SPI,I2C
Touch Panel	No
Power Supply	3V
Duty	1/32
Operating Temperature	-40~+80	°C
Storage Temperature	-40~+85	°C
Polarizer Type	Polarizer
FPC Options	No
Type	OLED Graphic Display

Pin No.

Symbol

Function

ESD_GND

This pin should be connected to GND.

VPP

OLED panel power supply.
Connect to capacitor. It could be supplied externally. This is the most positive voltage supply.

VCOMH

This is a pin for the voltage output high level for common signals.
A capacitor should be connected between this pin and VSS.

SEGH

This is a segment pre-charge voltage.
A capacitor can be connected between this pin and GND if necessary. When external capacitor is not used, this pin should be kept NC.

VSL

Discharge voltage level pad.
This pad should be connected to resistor and diode externally.

VSS

Ground for logic and analog. This pin should be connected to GND externally.

VDD

Power supply for logic.

RES

This is a reset signal input pin. When RES is set to “L”, the settings are initialized. The reset operation is performed by the RES signal level.
This pin internal pull high.

A0/SA0

This is the Data/Command control pin that determines whether the data bits are data or a command.
In I2C interface, this pad serves as SA0 to distinguish the different address of OLED driver.

This pin is the chip select input. When CS = “L”, then the chip select becomes active, and data/command I/O is enabled.

SCL

The serial clock input.

The serial data input.

IM1

MCU bus interface selection pins.

	IM1
4-Wire SPI	0
I2C	1

IREF

This is a segment current reference pin.
A resistor should be connected between this pin and GND.

DVDD

This pin is for regulator circuit.
A capacitor should be connected between this pin and GND if necessary. When external capacitor Is not used, this pin should be kept NC

ESD_GND

This pin should be connected to GND.

REX012832S Contour Drawing - Graphic OLED Display Module - Raystar

Parameter	Symbol	Min	Max	Unit
Supply Voltage for Logic	VDD	-0.3	3.5	V
Supply Voltage for Display	VPP	-0.3	15.0	V
Operating Temperature	TOP	-40	+80	°C
Storage Temperature	TSTG	-40	+85	°C

DC Electrical Characteristics

Item	Symbol	Condition	Min	Typ	Max	Unit
Supply Voltage for Logic	VDD	－	1.65	3.0	3.5	V
Supply Voltage for Display	VPP	－	8.0	9.0	9.5	V
Input High Volt	VIH	－	0.8×VDD	－	VDD	V
Input Low Volt	VIL	－	VSS	－	0.2×VDD	V
Output High Volt	VOH	－	0.8×VDD	－	VDD	V
Output Low Volt	VOL	－	VSS	－	0.2×VDD	V
Display 50% Pixel On	IPP	VPP=9V	－	3	6	mA