LS0154I05-S-V2 1.54 inch TFT-LCD Module 240x240 262k Colors IPS
1. Executive Summary & Product Positioning
The LS0154I05-S-V2 is a 1.54-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). It is composed of a TFT-LCD panel, a driver circuit, and a backlight unit. The panel size is 1.54 inch and the resolution is 240(RGB)*240, the panel can display up to 262k colors.
Product Positioning: This module features a compact 1.54-inch IPS (In-Plane Switching) panel with a square 1:1 aspect ratio, offering superior viewing angles and high color performance. With a standard SPI (4-Line Serial) interface, it is well-suited for a wide range of applications such as industrial HMI, smart home devices, wearable devices, and other embedded systems requiring a compact and reliable display solution.
2. Detailed Product Overview & Architecture
The module's architecture is designed for robust performance and easy integration. The primary components include:
- TFT-LCD Panel: 1.54-inch diagonal, a-Si TFT active matrix, transmissive, IPS. Resolution is 240(RGB) × 240 pixels. Active area is 27.72 (H) × 27.72 (V) mm.
- Driver Circuit: The module integrates a Driver IC (ST7789P3), communicating via an SPI (4-Line Serial) Interface.
- Backlight Unit (B/L): A white LED backlight with 3 Chip-White LEDs configured in parallel. The typical driving condition is IF=60mA, Vf=3V (TYP).
- Mechanical Construction: COG (Chip-on-Glass) + FPC (with PI reinforcement, total thickness ~0.30mm) + B/L. The total module thickness is 2.04±0.2 mm.
- Interface: The module communicates via a 15-pin FPC connector. The display interface is 4-Line SPI (Serial Interface).
- Display Mode: Active matrix TFT, Transmissive type, IPS.
- Viewing Direction (Grayscale Inversion): IPS.
- RoHS: All materials are compliant with RoHS standards.
3. Exhaustive Technical Specifications
3.1 General & Mechanical Specifications
| Item | Specification |
| Display Size (Diagonal) | 1.54 inches |
| Resolution (Dots) | 240(RGB) × 240 (Square) |
| Display Technology | Active Matrix TFT, Transmissive, a-Si, IPS |
| Module Construction | COG+FPC+B/L |
| Color Depth | 262K Colors |
| Viewing Direction (Grayscale Inversion) | IPS |
| Input Data Interface | SPI (4-Line Serial) |
| Driver IC | ST7789P3 |
| Module Size (H×V×D) | 31.52 × 33.72 × 2.04 mm |
| Active Area (AA, H×V) | 27.72 × 27.72 mm |
| Pixel Arrangement | RGB Dot-matrix (240(RGB)×240) |
| Display Mode | Active matrix TFT, Transmissive type |
| Backlight Type | 3 Chip-White LED, Parallel |
| Operating Temperature | -20°C to +70°C |
| Storage Temperature | -30°C to +80°C |
| Environmental Compliance | RoHS |
3.2 Absolute Maximum Ratings
Stress beyond those listed may cause permanent damage.
| Item | Symbol | Min | Max | Unit | Remark |
|---|---|---|---|---|---|
| Supply voltage | VCC | -0.3 | 4.6 | V | Note1 Note2 |
| Supply voltage | IOVCC | -0.3 | 4.6 | V | Note1 Note2 |
| Operating temperature | TOPR | -20 | 70 | °C | Note1 Note2 |
| Storage temperature | TSTR | -30 | 80 | °C | Note1 Note2 |
3.3 Electrical Characteristics
3.3.1 Recommended Operating Conditions
Condition: Ta=25°C.
| Item | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Supply voltage | VCC | 2.4 | 2.8 | 3.3 | V |
| I/O supply voltage | IOVCC | 1.65 | 1.8 | 3.3 | V |
| Input Voltage "L" level | VIL | 0 | --- | 0.3*IOVCC | V |
| Input Voltage "H" level | VIH | 0.7*IOVCC | --- | IOVCC | V |
3.3.2 Backlight LED Characteristics
The backlight consists of 3 Chip-White LEDs in Parallel. The backlight drive condition is IF=60mA, Vf=3V (TYP).
| Parameter | Symbol | Typ | Unit |
|---|---|---|---|
| Forward Voltage | Vf | 3.0 | V |
| Forward Current | IF | 60 | mA |
3.4 Interface Pin Assignment (15-Pin FPC)
Connector: 15-pin FPC. Interface: 4-Line SPI (Serial Interface).
| PIN NO. | Symbol | I/O | Description |
|---|---|---|---|
| 1 | CS | I | Chip selection pin |
| 2 | GND | P | Ground |
| 3 | SCLK | I | Serial clock pin |
| 4 | RST | I | This signal will reset the device and it must be applied to properly initialize the chip. |
| 5 | SDA | I | SPI interface input pin. |
| 6 | TE | O | Tearing effect signal is used to synchronize MCU to frame memory |
| 7 | DCX | I | Display data/command selection pin in 4-line serial interface. |
| 8 | IOVCC | P | power supply |
| 9 | VCC | P | power supply |
| 10 | VCC | P | power supply |
| 11 | GND | P | Ground |
| 12 | GND | P | Ground |
| 13 | LEDA | P | Power for LED backlight anode |
| 14 | LEDA | P | Power for LED backlight anode |
| 15 | LEDK | P | Power for LED backlight cathode |
3.5 Timing Characteristics
3.5.1 4-Line Serial Interface Characteristics
The timing parameters for this module are listed as TBD (To Be Determined) in the specification. The values below are derived from a related specification for reference only. For precise timing, please consult the official datasheet.
| Signal | Symbol | Parameter | MIN | MAX | Unit | Description |
|---|---|---|---|---|---|---|
| CSX | TCSS | Chip select setup time (write) | TBD | -- | ns | - |
| CSX | TCSH | Chip select hold time (write) | TBD | -- | ns | - |
| CSX | TCSS | Chip select setup time (read) | TBD | -- | ns | - |
| CSX | TSCC | Chip select hold time (read) | TBD | -- | ns | - |
| CSX | TCHW | Chip select "H" pulse width | TBD | -- | ns | - |
| SCL | TSCYCW | Serial clock cycle (Write) | TBD | -- | ns | -write command & data ram |
| SCL | TSHW | SCL "H" pulse width (Write) | TBD | -- | ns | -write command & data ram |
| SCL | TSLW | SCL "L" pulse width (Write) | TBD | -- | ns | -write command & data ram |
| SCL | TSCYCR | Serial clock cycle (Read) | TBD | -- | ns | -read command & data ram |
| SCL | TSHR | SCL "H" pulse width (Read) | TBD | -- | ns | -read command & data ram |
| SCL | TSLR | SCL "L" pulse width (Read) | TBD | -- | ns | -read command & data ram |
| D/CX | TDCS | D/CX setup time | TBD | -- | ns | - |
| D/CX | TDCH | D/CX hold time | TBD | -- | ns | - |
| SDA (DIN) | TSDS | Data setup time | TBD | -- | ns | - |
| SDA (DIN) | TSDH | Data hold time | TBD | -- | ns | - |
| DOUT | TACC | Access time | TBD | TBD | ns | For maximum CL=30pF |
| DOUT | TOH | Output disable time | TBD | TBD | ns | For maximum CL=30pF |
3.6 Design Notes from Documentation
- B/L Driver: The backlight driving condition is IF=60mA, Vf=3V (TYP) for 3 parallel LEDs.
- Mechanical: Tolerance of segments to edge of glass: ±0.2mm. The FPC includes PI reinforcement with a total thickness of 0.3mm (FPC+PI补强). Yellow insulating tape is used for protection. Conductive fabric tape (导电布, T=0.05mm) is used for EMI protection. An easy-tear sticker is provided for FPC handling.
- Housing: It is recommended that the housing visual area be at least 0.3mm smaller than the VA (Viewing Area) on each side. The housing foam window should be at least 0.6mm larger than the VA on each side. TP edge should not contact metal conductors to avoid ESD or short circuit risks.
- RoHS: RoHS compliance is expected.
4. Application Guidelines & Critical Notes
- Power Supply: The module requires a 2.8V (Typ.) power supply for VCC and 1.8V (Typ.) for IOVCC. Ensure the power supply ripple is minimized.
- Interface: This module uses a standard 4-Line SPI (Serial Interface) protocol. The host microcontroller must be configured for this protocol, managing signals such as CS, DCX, SCLK, and SDA.
- Backlight Driver (External): An external constant current driver is required to supply the backlight via the LEDA and LEDK pins.
- Reset: A hardware reset pin (RST, Pin 4) is provided. It must be applied to properly initialize the chip.
- Handling Precautions: Handle the module with care to avoid damage to the glass or FPC. Ground yourself to prevent electrostatic discharge (ESD).
- EMI Protection: The module uses conductive fabric tape for EMI protection on the FPC bending area.
5. Conclusion & Design-In Support
The LS0154I05-S-V2 from Lesson Smart Display Technology is a 1.54-inch IPS TFT-LCD module. It is a compact, square-resolution display solution suitable for a wide variety of embedded display applications such as smart wearables, industrial HMI, and smart home devices.
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 (ST7789P3) datasheet for detailed command initialization.
- Design a clean 2.8V/1.8V power supply and a backlight constant current driver circuit.
- Configure the host MCU'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.
