Home Products COG LCD WO128128A2

Round LCD Screen Panel, Round LCD Display Module 128x128 with PCB

Model No. WO128128A2

►COG LCD Display
►Graphic LCD
►128×128 dots
►Built-in controller ST75161
►+3V power supply
►1/136 duty cycle
►Interface : Default 8080, Option 6800, SPI-4 Line/SPI-3Line 9bit, I2C


WO128128A2 model is a round COG LCD display WO128128A model with a PCB board on module. This Round LCD display module is built in with ST75161 IC; it supports 8080 parallel (default), 6800 parallel, 3-wire and 4-wire serial SPI, I2C interface, power supply voltage 3V, 1/136 driving duty, 1/12 BIAS. The advantage of WO128128A2 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. WO128128A2 also have VDD 5V power supply voltage for optional.

The supply voltage for logic of WO128128A2 is 2.7V to 3.3V, typical value 3V. This module can be operating at temperatures from -20℃ to +70℃; its storage temperatures range from -30℃ to +80℃. WO128128A2 Round LCD Screen Panel is available in FSTN positive LCD type with white LED backlight. Please contact us if you need different types of LCDs or LED combinations.


Round LCD, Round LCD Display Module, Round LCD Panel, Round LCD Screen - WO128128A2


Interface Pin Function

Pin No. SYMBOL Function
1 VDD Power supply
2 NC No Connection
3 VSS Ground
4 CSB Chip select input pin.
5 A0 It determines whether the access is related to data or command.
6 ERD Read / Write execution control pin.
7 RWR Read / Write execution control pin.
8 RSTB Hardware reset input pin
9-16 D0-D7 When using 8-bit parallel interface: 8080 or 6800 mode:8 bit bi-directional data bus When using serial interface : 4-line SPI or 3-line SPI mode
D[7:4] : fix to “H” by VDD1.  D[3:1] : serial input/output data (SDA).
D[0] : serial input clock (SCL). D1 to D3 must be connected together (SDA)
When using serial interface : I2C interface
D[7] : SA[1], I2C slave address bit. Must be connected to VDD1 or VSS1. D[6] : SA[0], I2C slave address bit. Must be connected to VDD1 or VSS1.
D[5:4] : fix to “H” by VDD1. D[3:2] : SDA_OUT, serial data and acknowledge output for the I2C interface. D[1] : SDA_IN, serial input data D[0] : SCL, serial input clock .
D1 to D3 must be connected together (SDA)    
CSB must be fixed to “L” by VSS1.
17 A Anode input for LED backlight.
18 K Cathode input for LED backlight

Mechanical Data

Item Dimension Unit
Number of dots 128 x 128
Module dimension 60.0 x 62.79 x 8.6 mm
View area 42.0 x 42.0 mm
Active area 44.0 x 44.0 mm
Dot size 0.308 x 0.308 mm
Dot pitch 0.310 x 0.310 mm
Duty 1/136 Duty,1/12 Bias
Backlight Type LED
IC ST75161

Absolute Maximum Ratings

Item Symbol Min Typ Max Unit
Operating Temperature TOP -20 +70
Storage Temperature TST -30 +80
Power Supply Voltage VDD -0.3 4.0 V
LCD Power supply voltage VLCD -0.3 20 V
LCD Power supply voltage V0-XV0 -0.3 19 V
Input voltage VIN -0.3   VDD+0.3 V

Electrical Characteristics

Item Symbol Condition Min. Typ. Max. Unit
Supply Voltage For Logic VDD-VSS 2.7 3.0 3.3 V
Supply Voltage For LCD 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=3.0V 2.0 mA

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