Home Products COG LCD WO128128A

Circular LCD Screen, Circular LCD Display Module 128x128

Model No. WO128128A

►COG LCD Display
►Graphic LCD
►128×128 dots
►IC: ST75161
►+3.3V power supply
►1/136 duty cycle
►Interface : 6800/8080/SPI/I2C


The WO128128A is a COG monochrome graphic circular LCD display module with a 128x128 dot matrix format. This Circular LCD screen display module is equipped with the ST75161 IC and supports 8080/6800 parallel, 3-wire and 4-wire serial SPI, and I2C interfaces. The viewing direction is set at 6 o'clock, with a 1/136 driving duty and 1/12 BIAS.

The logic supply voltage for the WO128128A is in the range of 2.7V to 3.3V, with a typical value of 3V. This circular LCD screen module can operate within temperatures ranging from -20℃ to +70℃, and its storage temperatures range from -30℃ to +80℃.

The WO128128A is available in two variants: FSTN Negative (WO128128A-TDI) and FSTN positive LCD type with white LED backlight (WO128128A-TFH). USB demo kits are currently available, and interested parties are encouraged to contact us for USB sampling or a quotation.

Demo kit P/N: WWSTNUSBDEMO-00 for WO128128A-TFH LCD module
Demo kit P/N: WWSTNUSBDEMO-01 for WO128128A-TDI LCD module

WO128128A Circular LCD Screen, Circular LCD Display Demo Kits - Winstar


Circular LCD, Circular LCD Screen, Circular LCD Display, Circular LCD Display Module - WO128128A
Data source ref: WO128128A-TFH#


Interface Pin Function

Pin No. SYMBOL Function
1 VG VG is the power of SEG-drivers.
2 V0 Positive operating voltage of COM-drivers.
3 XV0 Negative operating voltage of COM-drivers.
4 CA1P DC/DC voltage converter
5 CA1N
6 VDD Power supply
7 VSS Ground
8 COMSCN Set scan direction of COM.
9 IF2 These pins select interface operation mode.
10 IF1
11 IF0
12 CSB Chip select input pin.
13 A0 It determines whether the access is related to data or command.
14 ERD Read / Write execution control pin.
15 RWR Read / Write execution control pin.
16 RSTB Hardware reset input pin
17-24 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.
25 A Anode input for LED backlight.
26 K Cathode input for LED backlight

Mechanical Data

Item Dimension Unit
Number of dots 128 x 128
Module dimension 55.0 x 57.0 x 6.18 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 0.328 x 0.328 mm
Duty 1/136 DUTY,1/12 BIAS
Backlight Type LED
IC ST75161
Interface 68/80/4-Line SPI/I2C/9-bit 3-line serial interface

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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