LS0145I05-S-V1 1.45 inch TFT-LCD Module 172x320 262k Colors IPS
1. Executive Summary & Product Positioning
The LS0145I05-S-V1 is a 1.45-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 1.45 inch and the resolution is 172(RGB)*320, the panel can display up to 262k colors.
Product Positioning: This module features a compact 1.45-inch IPS (In-Plane Switching) panel, offering superior viewing angles (All Views) and a high typical brightness of 600 cd/m². It is designed for space-constrained applications where a bright and high-quality display is required, such as smart wearables, portable instruments, and small control panels.
2. Detailed Product Overview & Architecture
The module's architecture is designed for robust performance and easy integration. The primary components include:
- TFT-LCD Panel: 1.45-inch diagonal, a-Si TFT active matrix, transmissive, IPS mode. Resolution is 172(RGB) × 320 pixels with an active area of 19.80 (H) × 35.00 (V) mm.
- Backlight Unit (B/L): A white LED backlight with 1 Chip-White LED. The typical driving condition is IF=20mA, VF=3.0V (TYP). The high typical luminance is 600 cd/m².
- Mechanical Construction: COG (Chip-on-Glass) + FPC + B/L. The module outline dimensions are 23.33 (H) × 43.46 (V) × 1.84 (D) mm.
- Interface: The module communicates via an FPC connector. The display interface is SPI 4W (4-wire Serial Peripheral Interface).
- Display Mode: Transmissive, IPS, Normally Black.
3. Exhaustive Technical Specifications
3.1 General & Mechanical Specifications
| Item | Specification |
| Display Size (Diagonal) | 1.45 inches |
| Resolution (Dots) | 172(RGB) × 320 |
| Display Technology | Active Matrix TFT, Transmissive, a-Si, IPS |
| Module Construction | COG+FPC+B/L |
| Color Depth | 262K Colors |
| Viewing Direction | IPS (All Views) |
| Input Data Interface | SPI 4W |
| Module Size (H×V×D) | 23.33 × 43.46 × 1.84 mm |
| Active Area (H×V) | 19.80 × 35.00 mm |
| Pixel Arrangement | RGB Stripe |
| Display Mode | Transmissive, IPS, Normally Black |
| Backlight Type | 1 Chip-White LED |
| Operating Temperature | -20°C to +70°C |
| Storage Temperature | -30°C to +80°C |
3.2 Absolute Maximum Ratings (Ta=25°C)
Stress beyond those listed may cause permanent damage.
| Parameter | Symbol | Min | Max | Unit |
|---|---|---|---|---|
| Supply voltage (VDD) | VDD | -0.3 | 4.6 | V |
| Supply voltage (IOVDD) | IOVDD | -0.3 | 4.0 | V |
| Operating temperature | TOPR | -20 | 70 | °C |
| Storage temperature | TSTR | -30 | 80 | °C |
3.3 Electrical Characteristics (Ta=25°C)
3.3.1 Typical Operating Conditions
Condition: VDDI=1.65 to 3.3V, VDD=2.4 to 3.3V, AGND=DGND=0V, Ta=25°C.
| Parameter | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Supply voltage (Digital) | VDD | 2.4 | 2.8 | 3.3 | V |
| I/O supply voltage | VDDI | 1.65 | 1.8 | 3.3 | V |
3.3.2 Backlight LED Characteristics
The backlight consists of 1 Chip-White LED.
| Parameter | Symbol | Typ | Unit |
|---|---|---|---|
| Forward Voltage | VF | 3.0 | V |
| Forward Current | IF | 20 | mA |
3.4 Interface Pin Assignment
Interface: SPI 4W.
| Pin No. | Pin Name | Function |
|---|---|---|
| 1 | GND | Ground |
| 2 | LEDK | Backlight Cathode |
| 3 | LEDA | Backlight Anode |
| 4 | RES | Reset signal (Active low) |
| 5 | CS | Chip select (Active low) |
| 6 | RS (DCX) | Data/Command selection (High: Data, Low: Command) |
| 7 | SCL | SPI clock |
| 8 | SDA | SPI data input/output |
3.5 Electro-Optical Characteristics (Ta=25°C)
| Item | Condition | Spec | Unit |
|---|---|---|---|
| Luminance (IF=20mA) | θx = θy = 0° | 600 (Typ) | cd/m² |
| Viewing Angle (IPS) | CR > 10 | 80 (Typ) all directions | Deg. |
3.6 Design Notes from Documentation
- B/L Driver: The backlight driving condition is IF=20mA, VF=3.0V (TYP). A constant current source is recommended.
- Mechanical: Tolerance of segments to edge of glass: ±0.2mm.
- 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: The TP edge should not contact metal conductors.
4. Application Guidelines & Critical Notes
- Power Supply: The module requires a 2.8V (Typ.) power supply for VDD and 1.8V (Typ.) for VDDI. Ensure the power supply ripple is minimized.
- Interface: This module uses a standard 4-wire SPI interface. The microcontroller must be configured for this protocol.
- Backlight Driver (External): An external constant current driver is required to supply a typical current of 20mA at a forward voltage of 3.0V.
- Reset: A hardware reset pin (RES, Pin 4) is provided. A reset pulse duration as per the driver IC specification is required.
- Handling Precautions: Handle the module with care to avoid damage to the glass or FPC. Ground yourself to prevent electrostatic discharge (ESD).
5. Conclusion & Design-In Support
The LS0145I05-S-V1 from Lesson Smart Display Technology is a bright, compact 1.45-inch TFT-LCD module with an IPS panel. It is an excellent solution for applications requiring a small display with high brightness (600 nits) and wide viewing angles in a compact form factor.
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 datasheet for detailed command initialization.
- Design a clean 2.8V/1.8V power supply and a backlight constant current driver circuit capable of delivering 20mA.
- 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, bright, and vibrant display solution for space-constrained applications.
