ST-LCD128E
1.28-Inch Round Color LCD Serial Display Module with Capacitive Touch
Product Overview
Compact round display solution for embedded applications
The ST-LCD128E is a compact 1.28-inch round color LCD serial display module featuring
capacitive touch capability. It integrates a single circular color LCD screen with 240×240 resolution,
a dedicated display driver IC, and pre-programmed animated expression contents that can be customized
to meet specific customer requirements. Communication is handled through a simple UART serial interface
(115200bps, 8N1), allowing users to easily switch between various animated expressions.
High Resolution Display
1.28-inch round color LCD with 240×240 pixel resolution for crisp and vibrant graphics.
UART Serial Interface
Easily communicate via UART at 115200bps (8N1) – no complex programming required.
Capacitive Touch
Built-in capacitive touch panel for interactive user interface applications.
Customizable Content
5 standard expressions included. Custom expressions and displays available per request.
Dual Power Supply
Supports TYPE-C USB (5V) or MX1.25-4P connector (3.3V) for flexible integration.
Low Power Design
Working current <150mA, standby <50mA. Ideal for battery-powered devices.
Product Images
Physical appearance of the ST-LCD128E module
Technical Specifications
Complete electrical and mechanical parameters
| Parameter | Specification |
|---|---|
| Model Number | ST-LCD128E (V1.0) |
| Screen Type | 1.28-inch Round Color LCD |
| Resolution | 240 x 240 pixels |
| Effective Display Area | Inner diameter 32.9 mm |
| Touch Type | Capacitive Touch Panel |
| Communication Interface | UART Serial Port |
| Baud Rate | 115200 bps |
| Data Format | 8 data bits, No parity, 1 stop bit (8N1) |
| Signal Level | 3.3V CMOS Level |
| Power Supply (P3/MX1.25-4P) | 3.1 ~ 3.4 VDC |
| Power Supply (TYPE-C) | 4.3 ~ 5.5 VDC |
| Working Current | < 150 mA |
| Standby Current | < 50 mA (display off) |
Interface Definition
MX1.25-4P Connector P3 Pin Configuration
| Pin | Name | Description |
|---|---|---|
| 1 | 3.3V | Power positive – Display module supply (3.1~3.4VDC) |
| 2 | TX | Module TX output -> Connect to user MCU RX pin |
| 3 | RX | Module RX input <- Connect to user MCU TX pin |
| 4 | GND | Ground – Power and communication ground/negative |
Dimensional Drawing
Mechanical dimensions (Unit: mm)
Figure: Dimensional Drawing – Outer OD: 38.50+/-0.2mm, Sensor OD: 37.51+/-0.2mm
| Parameter | Value | Note |
|---|---|---|
| Outer Diameter | 38.50 +/- 0.2 mm | SENSOR OD |
| Sensor Outer Diameter | 37.51 +/- 0.2 mm | SENSOR OD |
| Outer Ring Radius | R23.65 mm | – |
| Inner Ring Radius | R16.45 mm | – |
| Effective Display Area | Inner diameter 32.9 mm | Round screen active area |
| 3D Model | STEP file available | Contact manufacturer |
Preloaded Expressions
Standard expression list (customizable upon request)
| Address | Expression | Animation Effect | Description |
|---|---|---|---|
| 1 | Normal | Eyes move L/R/U/D | Default idle state |
| 2 | Dizzy | Eyes spinning in circles | – |
| 3 | Star Eyes | Stars grow/shrink | Surprise/Excitement |
| 4 | Blinking | Alternate eye blinking | Playful/Mischievous |
| 5 | Heart Eyes | Hearts grow/shrink | – |
| 6 | Customizable – Other expressions available per customer request | ||
Communication Protocol
Switch expression command format (Hexadecimal: 0xXX), Total: 9 bytes
Command Frame Structure:
[Addr] = Content Address (1-5 for standard expressions, custom address for others)
Replace the D6 byte (Data Byte 6) with the target expression address value
| Field | Value | Description |
|---|---|---|
| Header | A5 | Fixed header byte |
| Operation Code | 00 | Reserved operation code |
| Data Bytes 1-5 | 00 02 00 00 00 | Command parameters (fixed) |
| Data Byte 6 | [Address] | Target expression address (1-6) |
| Tail/Checksum | C3 | Fixed end byte |
Application Scenarios
Ideal use cases for the ST-LCD128E module
Small Appliances
Handheld Fans
Knob Displays
Wearables
Robot Eyes
Usage Notes
Important information for safe handling and installation
⚠️ Important Notes
- Glass Component: The LCD display device is made of glass. Take protective measures during transportation, installation, and usage to prevent damage.
- Customizable Content: This is a standard product with customizable display content. Contact us with your custom requirements and materials.
- Fixed Interface: Connect according to the specified pin definition and follow the UART protocol standards for proper operation.
- ESD Protection: Handle the module with appropriate ESD protection measures. Avoid touching circuit board contacts directly with bare hands.
- Low Power Mode: For battery-powered applications, control the 3.3V power supply via MOSFET switching to achieve minimal power consumption.
Interested in This Product?
Contact us for pricing, customization options, technical support, or sample requests.