Home Products COG LCD WO256128A2

Module LCD Graphique COG 256x128 avec PCB

Model No. WO256128A2

►LCD COG Module
►Graphic LCD
►256x128 dots
►IC: ST75256
►+3.3V power supply
►1/128 duty cycle
►Interface : Default 8080, Option 6800, SPI 4 Line, I2C


The WO256128A2 model is a COG LCD display featuring a PCB board on module with a resolution of 256x128 dots and a diagonal size of 2.9 inches. The module is equipped with an ST75256 controller IC and supports multiple interfaces, including 8080 8-bit parallel (default), 6800 8-bit, and 4-wire serial SPI and I2C. The power supply voltage is 3.3V, and it operates with a 1/128 duty and 1/12 bias.

One of the notable advantages of the WO256128A2 is its PCB board with a circuit layout and screw holes, facilitating easy installation on customer applications. Additionally, it offers three connector pitch sizes: 2.54mm (default), 1.0mm, and 0.5mm. The module also provides the option for a VDD 5V power supply voltage.

Operating within a temperature range of -20℃ to +70℃ and storage temperatures from -30℃ to +80℃, the WO256128A2 is suitable for applications such as measuring instruments, electronic controllers, electronic scales, coffee machines, and more. The module has dimensions of 93.0 × 54.0 mm, with a viewing area size of 66.54 × 33.26 mm.

The WO256128A2 is available in FSTN positive Transflective with a white LED backlight. For inquiries about different LCD types or LED combinations, please feel free to contact us.


Chip on Glass LCD Modules 256x128 - WO256128A2


Interface Pin Function

Pin No. Symbol Description
1 VDD +3.3V
2 NC No connection
3 VSS ground
4 CSB Chip select input pin
5 A0 Whether the access is related to data or command
6 ERD Read or write enable terminal
7 RWR Read/Write execution control pin
8 RSTB Reset input pin
9~16 D0~D7 Data bus line
17 A LED+
18 K LED-

Mechanical Data

Item Dimension Unit
Number of dots 256 × 128
Module dimension 93.0 × 54.0 × 9.5 mm
View area 70.7 × 38.8 mm
Active area 66.54 × 33.26 mm
Dot size 0.24 × 0.24 mm
Dot pitch 0.26 × 0.26 mm
Drive Method 1/128 Duty, 1/12 Bias
Backlight Type LED
IC ST75256
Interface 8080

Absolute Maximum Ratings

Item Symbol Min Typ Max Unit
Operating Temperature TOP -20 +70
Storage Temperature TST -30 +80
MPU Interface Input Voltage VIN -0.3 VDD+0.3 V
Digital Power Supply Voltage VDD-VSS -0.3 4.0 V
LCD Power supply voltage V0- XV0 -0.3 19.0 V

Electrical Characteristics

Item Symbol Condition Min Typ Max Unit
Supply Voltage For Logic VDD-VSS 3.0 3.3 3.6 V
Supply Voltage For LCM VOP Ta=-20℃



Input High Volt. VIH 0.7 VDD VDD V
Input Low Volt. VIL VSS 0.3 VDD V
Output High Volt. VOH 0.8 VDD VDD V
Output Low Volt. VOL VSS 0.2 VDD V
Supply Current IDD VDD=3.3V 1.5 2.0 mA

Search keyword: 256x128 lcd, 256 x 128 lcd, lcd 256x128, lcd 256 x 128
go top