LS0128I13-S-V1 1.28 inch TFT-LCD Module 240x240 262K Colors
Product Keywords: 1.28″ LCD Module, COG+FPC+B/L, 240(RGB)×240 Resolution, 262K Colors, Transmissive a-Si TFT-LCD, IPS, ST77912 Driver, 4-Line Serial Interface, 2 Chip-White LED Series (40mA), -10°C to +60°C Operation.
1. Executive Summary & Product Positioning
The LS0128I13-S-V1 is a 1.28-inch transmissive type a-Si TFT-LCD (amorphous silicon thin film transistor liquid crystal display) module developed by 立信(万安)智显科技有限公司 (Lesson Smart Display Technology Co., Ltd). The panel size is 1.28 inch and the resolution is 240(RGB)*240, the panel can display up to 262k colors.
Product Positioning: This compact module is well-suited for a wide range of applications such as smart wearables, handheld devices, portable instruments, and other embedded systems requiring a small, high-quality display.
2. Detailed Product Overview & Architecture
The module's architecture is designed for robust performance and easy integration. The primary components include:
- TFT-LCD Panel: 1.28-inch diagonal, a-Si TFT active matrix, transmissive, IPS (In-Plane Switching). Resolution is 240(RGB) × 240 pixels.
- Driver Circuit: The module integrates a Driver IC (ST77912), communicating via a 4-Line Serial Interface.
- Backlight Unit (B/L): A white LED backlight with 2 Chip-White LEDs configured in series. The typical driving condition is IF=40mA, Vf=3.0V ~ 3.1V.
- Mechanical Construction: COG (Chip-on-Glass) + FPC + B/L. The LCM module dimensions are 35.8 (W) × 35.8 (H) × 2.1 (D) mm.
- Interface: The module communicates via a 15-pin FPC connector. The display interface is 4-Line Serial (SPI).
- Display Mode: Transmissive, IPS, Normally Black.
- Optimum Viewing Angle: FREE (IPS).
- RoHS: All materials are compliant with RoHS standards.
3. Exhaustive Technical Specifications
3.1 General & Mechanical Specifications
| Item | Specification |
| Display Size (Diagonal) | 1.28 inches |
| Resolution (Dots) | 240(RGB) × 240 |
| Display Technology | Active Matrix TFT, Transmissive, a-Si, IPS |
| Module Construction | COG+FPC+B/L |
| Color Depth | 262K Colors |
| Input Data Interface | 4-Line Serial Interface |
| Driver IC | ST77912 |
| LCM Size (H×V×D) | 35.8 × 35.8 × 2.1 mm |
| LCD Active Area (H×V) | 32.4 × 32.4 mm |
| Pixel Arrangement | RGB Dot-matrix (240(RGB)×240) |
| Display Mode | Transmissive, IPS, Normally Black |
| Backlight Type | 2 Chip-White LEDs, Series |
| Optimum Viewing Angle | FREE (IPS) |
| Operating Temperature | -10°C to +60°C |
| Storage Temperature | -20°C to +70°C |
| Environmental Compliance | RoHS |
3.2 Absolute Maximum Ratings
Stress beyond those listed may cause permanent damage to the device.
| Item | Symbol | Min | Max | Unit | Remark |
|---|---|---|---|---|---|
| Supply voltage (VCC) | VCC | -0.3 | 4.6 | V | Note1 Note2 |
| Supply voltage (IOVCC) | IOVCC | -0.3 | 4.6 | V | Note1 Note2 |
| Operating temperature | TOPR | -10 | 60 | °C | - |
| Storage temperature | TSTR | -20 | 70 | °C | - |
3.3 Electrical Characteristics
3.3.1 Backlight LED Characteristics
The backlight consists of 2 Chip-White LEDs in series. The driving condition is IF=40mA, Vf=3.0V~3.1V.
| Parameter | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Forward Voltage | Vf | 3.0 | - | 3.1 | V |
| Forward Current (Total) | IF | - | 40 | - | mA |
3.4 Interface Pin Assignment (15-Pin FPC)
The module communicates via a 15-pin FPC connector. The interface is 4-Line Serial (SPI).
| PIN NO. | Symbol | I/O | Description |
|---|---|---|---|
| 1 | LEDK | P | Power for LED backlight cathode |
| 2 | GND | P | Ground |
| 3 | FMARK | O | Tearing effect output pin to synchronize MPU to frame writing |
| 4 | SDA | I/O | Serial data input/output PIN |
| 5 | A0 | I | Command and Data select pin |
| 6 | SCLK | I | Serial clock pin |
| 7 | CS | I | Chip select pin |
| 8 | RESET | I | Reset pin. |
| 9 | IOVCC1.8V | P | power supply |
| 10 | VCC2.8V | P | power supply |
| 11 | VCC2.8V | P | power supply |
| 12 | GND | P | Ground |
| 13 | GND | P | Ground |
| 14 | LEDA | P | Power for LED backlight anode |
| 15 | LEDA | P | Power for LED backlight anode |
3.5 4-Line Serial Interface Timing Characteristics
Condition: VDDI=1.65 to 3.3V, VDD=2.65 to 3.3V, GND=RGND=0V, Ta=25℃.
| Signal | Symbol | Parameter | MIN | MAX | Unit |
|---|---|---|---|---|---|
| CSX | T_CSS | Chip select setup time (write) | 15 | - | ns |
| CSX | T_CSH | Chip select hold time (write) | 15 | - | ns |
| CSX | T_CHW | Chip select "H" pulse width | 40 | - | ns |
| SCL | T_SCYCW | Serial clock cycle (Write) | 16 | - | ns |
| SCL | T_SCYCR | Serial clock cycle (Read) | 150 | - | ns |
| D/CX | T_DCS | D/CX setup time | 7 | - | ns |
| SDA (DIN) | T_SDS | Data setup time | 7 | - | ns |
| SDA (DIN) | T_SDH | Data hold time | 7 | - | ns |
3.6 Electro-Optical Characteristics
Measuring Condition: Ta=25℃, dark room, 15min warm-up time.
| Item | Symbol | Condition | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|---|
| Response time | Tr+Tf | θx = θy =0 | - | 30 | 40 | ms |
| Contrast Ratio | CR | θx = θy =0 | 600 | 800 | - | - |
| Transmittance | T% | θx = θy =0 | 3.0 | 3.8 | - | % |
| Viewing angle (T/B/L/R) | θT, θB, θL, θR | CR > 10 | 80 | - | - | Deg. |
3.7 Design Notes from Documentation
- B/L Driver: The backlight driving condition is IF=40mA, Vf=3.0V~3.1V for 2 LEDs in series. A simple current limiting resistor or constant current source is required.
- Mechanical: LCM dimensions are 35.8 (W) × 35.8 (H) × 2.1 (D) mm. LCD dimensions are 35.8 (W) × 35.8 (H) mm. The module includes a 1 POL polarizer with thickness 0.15mm. Unmarked tolerance is ±0.2mm.
- Interface: The module uses a standard 4-line serial (SPI) interface with chip select (CS), serial clock (SCLK), data/command (RS/AO), and serial data (SDA).
- RoHS: All materials must be ROHS compliant.
- Connector: The FPC has 15 pins.
- IPS Display: This module features IPS (In-Plane Switching) technology providing excellent viewing angles.
4. Application Guidelines & Critical Notes
- Power Supply: The module requires a 2.8V (VCC) and 1.8V (IOVCC) power supply. Ensure the power supply ripple is minimized.
- Interface: This module uses a standard 4-line serial (SPI) protocol. The host processor must be configured for this protocol.
- Backlight Driver (External): A simple constant current source or current limiting resistor can be used to supply the backlight via the LEDA and LEDK pins. The required driving condition is 40mA total current at 3.0V~3.1V forward voltage.
- Reset: A hardware reset pin (RESET, Pin 8) is provided. Ensure proper reset timing as per the driver IC datasheet.
- Operating Temp: The module operates from -10°C to +60°C. Below 0°C, the response time of the liquid crystal becomes slower.
- Storage: Storage temperature range is -20°C to +70°C. Avoid high temperature and humidity during storage.
- Handling Precautions: Handle the module with care to avoid damage to the glass or FPC. Ground yourself to prevent electrostatic discharge (ESD). Avoid applying pressure to the display surface.
5. Conclusion & Design-In Support
The LS0128I13-S-V1 from Lesson Smart Display Technology is a compact 1.28-inch IPS TFT-LCD module with a 4-line serial interface. It is a reliable, high-quality display solution suitable for a wide variety of compact embedded display applications.
For successful design-in, engineers should:
- Obtain and review the complete, official Product Specification (Revision 1.0) for the full mechanical drawing and the driver IC (ST77912) datasheet for detailed initialization and timing parameters.
- Design a clean 2.8V/1.8V power supply for the LCD. Design a backlight constant current driver circuit capable of delivering 40mA at up to 3.1V.
- Configure the host processor's SPI interface to match the timing specifications detailed in this datasheet.
- Contact the manufacturer for evaluation modules, sample requests, and further technical support during the design-in phase.
This module is designed to provide a reliable and vibrant display solution for a wide array of applications.
