Home Products COG LCD WO256128A

Graphic COG LCD 256x128

Model No. WO256128A

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


WO256128A is a monochrome graphic LCD module made of 256x128 pixels, diagonal size 2.9 inch. This LCD Module WO256128A is built in with ST75256 controller IC, it supports 6800 8-bit, 8080 8-bit parallel and 4-wire serial SPI and I2C interface. The WO256128A is having the same outline dimension, and VA size and same power supply 3.3V as WO12864D3, but is having a much higher resolution and performance. The WO125128A is an upgrade version of WO12864D3 to meet with the customers’ requirement on higher resolution and the best thing is that the customers don’t have to change the mechanical design for their applications.

This module can be operating at temperatures from -20℃ to +70℃; its storage temperatures range from -30℃ to +80℃. The WO256128A is available for different LCD mode options, STN Negative, FSTN Negative (Double film) and FSTN positive and with LED backlight options, like white LED. Please contact with us if you need different LCD type and LED combination.


Graphic COG LCD 256x128, 256x128 LCD - WO256128A

Data source ref: WO256128A-TFH#


Interface Pin Function

Pin No. Symbol Description
2 VG Power of SEG-drivers
3 V0 Positive operating voltage of COM-drivers
4 XV0 Negative operating voltage of COM-drivers
5  CA1P DC/DC Voltage converte pin
6 CA1N DC/DC Voltage converte pin
7 VDDA +3.3V
8 VDD +3.3V
9 VSS ground
10 COMSCN Set scan directing of COM
11 IF1 These pins select interface operation mode
IF1 IF0 MPU interface type
L L 4-line serial interface
L H IIC serial interface
H L 8-bit 6800 parallel interface
H H 8-bit 8080 parallel interface
Note: Refer to "Parallel / Serial Interface" for detailed information.  
12 IF0
13 CSB Chip select input pin
14 A0 Whether the access is related to data or command
15 ERD Read or write enable terminal
16 RWR Read/Write execution control pin
17 RSTB Reset input pin
18~25 D0~D7 Data bus line

Mechanical Data

Item Dimension Unit
Number of dots 256 × 128
Module dimension 80.0 × 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 ST75256i
Interface 4-Line SPI/IIC/8-bit 6800/8-bit 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 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 mA

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