3.12″ 256×64 COF OLED Display

Model No. WEX025664B

  • Type: Graphic
  • Structure: COF
  • Size: 3.12 inch OLED
  • 256 x 64 Dot Matrix
  • IC：SSD1322
  • 3V Power supply
  • 1/64 duty
  • Interface: 6800, 8080, SPI
  • Display Color: White / Yellow / Sky Blue / Green
  • Support Grayscale
Categories: ,

Description

The model WEX025664B is a 3.12-inch COF-structured OLED graphic display with a resolution of 256×64 dots. This 3.12″ OLED display is equipped with an SSD1322 driver IC, supporting 8-bits 6800/8080, and 3-line/4-line SPI interfaces. It has an outline dimension of 88 x 27.8 mm, with an active area size of 76.778 x 19.178 mm. The display features 4-bits grayscale, and its logic voltage is 2.5V (typical value) with a duty cycle of 1/64. The module can operate at temperatures from -40°C to +80°C, and its storage temperature is from -40°C to +85°C.

The OLED module features a high contrast ratio of 10,000:1, allowing for more vibrant and true-to-life colors, deeper blacks, and brighter whites. This results in enhanced image quality, sharper details, and improved readability, particularly in low-light environments. Additionally, the high contrast ratio contributes to a more immersive viewing experience.

The OLED module is suitable for various applications such as wall/meter devices, home applications, POS systems, Cloud/IoT systems, handheld instruments, intelligent technology devices, energy systems, automotive applications, communication systems, and medical instruments. Customers can upgrade their current applications from traditional STN displays to OLED displays, as the module provides a very wide range of dot pixel formats for OLED solutions.

Additionally, OLED panels with the same dimensions offer a variety of alternatives:

  • WEX025664B-CTP series without a metal frame, PCB, and with a CTP touch screen.
  • WEN025664B series with a metal frame and PCB.
  • WEN025664B-CTP series with a metal frame, PCB, and CTP touch screen.

Drawing

Drawing

WEX025664B - OLED 256x64, 3.12 inch OLED Display Drawing

Data source ref: WEX025664BWPP3N00000

SPECIFICATIONS

SPECIFICATIONS

Interface Pin Function

Pin Number Symbol I/O Function
1 N.C. (GND) P Ground
2 VSS P Ground.
3 VCC P Power supply for panel driving voltage.
This is also the most positive power voltage supply pin.
4 VCOMH P COM signal deselected voltage level.
A capacitor should be connected between this pin and VSS.
5 VLSS P Analog system ground pin.
6~13 D7~D0 I/O Host Data Input/Output Bus
These pins are 8-bit bi-directional data bus to be connected to the microprocessor’s data bus.
When serial mode is selected, D1 will be the serial data input SDIN and D0 will be the serial clock input SCLK.
14 E/RD# I Read/Write Enable or Read
This pin is MCU interface input.
When interfacing to a 68XX-series microprocessor, this pin will be used as the Enable (E) signal. Read/write operation is initiated when this pin is pulled high and the CS# is pulled low.
When connecting to an 80XX-microprocessor, this pin receives the Read (RD#) signal. Data read operation is initiated when this pin is pulled low and CS# is pulled low.
When serial mode is selected, this pin must be connected to VSS.
15 R/W# I Read/Write Select or Write
This pin is MCU interface input. When interfacing to a 68XX-series microprocessor, this pin will be used as Read/Write (R/W#) selection input. Pull this pin to “High” for read mode and pull it to “Low” for write mode.
When 80XX 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 CS# is pulled low.
When serial mode is selected, this pin must be connected to VSS.
16 BS0 I Communicating Protocol Select
These pins are MCU interface selection input. See the following table:

BS:[1:0] Bus Interface Selection
00 4 line SPI
01 3 line SPI
10 8-bit 8080 parallel
11 8-bit 6800 parallel

Note
(1) 0 is connected to VSS
(2) 1 is connected to VDDIO
17 BS1
18 D/C# I Data/Command Control
This pin is Data/Command control pin connecting to the MCU.
When the pin is pulled HIGH, the content at D[7:0] will be interpreted as data.
When the pin is pulled LOW, the content at D[7:0] will be interpreted as command.
19 CS# I Data/Command Control
This pin is the chip select input connecting to the MCU. The chip is enabled for MCU communication only when CS# is pulled LOW.
20 RES# I 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.
21 FR O This pin is No Connection pins. Nothing should be connected to this pin. This pin should be left open individually.
22 IREF I Current Reference for Brightness Adjustment
This pin is segment current reference pin. A resistor should be connected between this pin and VSS. Set the current lower than 10uA.
23 N.C. – Reserved Pin
The N.C. pin between function pins are reserved for compatible and flexible design.
24 VDDIO P Power Supply for I/O Pin
It should be matched with the MCU interface voltage level.
25 VDD P Power Supply for Core Logic Circuit
Power supply pin for core logic operation. A capacitor is required to connect between this pin and VSS
26 VCI P Power Supply for Operation
VCI must always be equal to or higher than VDD and VDDIO.
27 VSL P Voltage Output Low Level for SEG Signal
This is segment voltage reference pin.
When external VSL is not used, this pin should be left open.
When external VSL is used, this pin should connect with resistor and diode to ground.
28 VLSS P Ground of Analog Circuit
These are the analog ground pins. They should be connected to VSS externally.
29 VCC P Power Supply for OLED Panel
These are the most positive voltage supply pin of the chip. They must be connected to external source.
30 N.C. (GND) P Ground

General Specification

General Specification

Item Dimension Unit
Dot Matrix 256 x 64 Dots －
Module dimension 88.0 × 27.8 × 2.15 mm
Active Area 76.778×19.178 mm
Pixel Size 0.278×0.278 mm
Pixel Pitch 0.3×0.3 mm
Display Mode Passive Matrix
Display Color Monochrome
Drive Duty 1/64 Duty
Gray Scale 4 bits
IC SSD1322 (COF)
Interface 6800, 8080, SPI
Size 3.12 inch

 

Absolute Maximum Ratings

Absolute Maximum Ratings

Parameter Symbol Min Max Unit
Supply Voltage for Operation VCI -0.3 4 V
Supply Voltage for Logic VDD -0.5 2.75 V
Supply Voltage for I/O Pins VDDIO -0.5 VCI V
Supply Voltage for Display VCC -0.5 20 V
Operating Temperature TOP -40 80 °C
Storage Temperature TSTG -40 85 °C

 

Electronical Characteristics

Electronical Characteristics

Item Symbol Condition Min Typ Max Unit
Supply Voltage for Logic VDD － 2.4 2.5 2.6 V
Power Supply for I/O pins VDDIO － 1.65 3.0 VCI V
Low voltage power supply VCI － 2.4 3.0 3.5 V
Supply Voltage for Display VCC － 11.5 14.5 15 V
High Level Input VIH － 0.8×VDDIO － VDDIO V
Low Level Input VIL － 0 － 0.2×VDDIO V
High Level Output VOH － 0.9×VDDIO － VDDIO V
Low Level Output VOL － 0 － 0.1×VDDIO V
50% Check Board operating Current ICC VCC =12V － 24 32 mA
VCC =14.5V － 32 42.5 mA

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