Home Products COG LCD WO256128A2

Chip on Glass LCD Modules 256x128 with PCB

Model No. WO256128A2

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


WO256128A2 model is a COG LCD display WO256128A model featured with a PCB board on module which is made of 256x128 dots, diagonal size 2.9 inch. WO256128A2 is built in with ST75256 controller IC, it supports 8080 8-bit parallel (default), 6800 8-bit and 4-wire serial SPI and I2C interface, power supply voltage 3.3V, 1/128 duty, 1/12 Bias. The advantage of WO256128A2 is having circuit layout on PCB board and with screw holes which make modules can be fixed on customers’ applications easily. Also, there are three kinds of connector pitch sizes of 2.54mm (default), 1.0mm and 0.5mm for options. WO256128A2 also have VDD 5V power supply voltage for optional.

WO256128A2 module can be operating at temperatures from -20℃ to +70℃; its storage temperatures range from -30℃ to +80℃. The WO256128A2 is available for FSTN positive Transflective with white LED backlight. Please contact us if you need different types of LCDs or LED combinations.


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

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

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