LS0145I08-S-V1 1.45 inch TFT-LCD Module 172x320 262K Colors
Product Keywords: 1.45″ LCD Module, COG+FPC+B/L, 172(RGB)×320 Resolution, 262K Colors, Transmissive a-Si TFT-LCD, IPS, ST7789P3 Driver, SPI Interface, 1 Chip-White LED (60mA), -20°C to +70°C Operation, AQL 0.65/1.5 Inspection, Revision 1.0.
1. Executive Summary & Product Positioning
The LS0145I08-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). The panel size is 1.45 inch and the resolution is 172(RGB)*320, the panel can display up to 262k colors. This module is a COG (Chip-on-Glass) + FPC + B/L (Backlight) construction. The product specification was released on 2026-07-07.
Product Positioning: This 1.45-inch module is well-suited for wearable devices, portable instruments, smart home controllers, and other compact embedded display systems requiring moderate resolution and a simple SPI interface.
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 (In-Plane Switching). Resolution is 172(RGB) × 320 pixels.
- Driver Circuit: The module integrates the ST7789P3 driver IC, communicating via an SPI (Serial Peripheral Interface).
- Backlight Unit (B/L): A white LED backlight with 1 Chip-White LED (per circuit diagram). The typical driving condition is IF=60mA, Vf=3V.
- Mechanical Construction: COG (Chip-on-Glass) + FPC + B/L. The LCM module size is 19.39 × 36.28 × 1.88 mm (H×V×D).
- Interface: The module communicates via a 10-pin FPC connector. The display interface is SPI (Serial Peripheral Interface).
- Display Mode: Transmissive, IPS.
- Viewing Direction (Grayscale Inversion): IPS (Free Viewing Direction).
- RoHS: All materials are compliant with RoHS standards.
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 |
| Module Construction | COG+FPC+B/L |
| Color Depth | 262K Colors |
| Input Data Interface | SPI |
| Driver IC | ST7789P3 |
| Module Size (H×V×D) | 19.39 × 36.28 × 1.88 mm |
| Active Area (H×V) | 17.39 × 32.35 mm |
| Number of Dots | 172(RGB) × 320 |
| Display Mode | Transmissive, IPS |
| Viewing Direction | IPS (Free Viewing Direction) |
| Backlight Type | 1 Chip-White LED |
| 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 to the device.
| Item | Symbol | Min | Max | Unit | Remark |
|---|---|---|---|---|---|
| Supply voltage | VDD | -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 | Remark |
|---|---|---|---|---|---|---|
| Supply voltage | VDD | 2.4 | 2.8 | 3.3 | V | Note1 |
| Input Voltage (L level) | VIL | 0 | --- | 0.3*IOVCC | V | Note1 |
| Input Voltage (H level) | VIH | 0.7*IOVCC | --- | IOVCC | V | Note1 |
3.3.2 Backlight LED Characteristics
The backlight consists of 1 Chip-White LED. The typical driving condition is IF=60mA, Vf=3V (TYP).
| Parameter | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Forward Current | IF | - | 60 | - | mA |
| Forward Voltage | Vf | - | 3 | - | V |
3.4 Interface Pin Assignment (10-Pin FPC)
The module communicates via a 10-pin FPC connector. The interface is SPI.
| PIN NO. | Symbol | I/O | Description |
|---|---|---|---|
| 1 | SDA | I/O | Serial data input/output PIN |
| 2 | SCL | I | Serial clock pin |
| 3 | RS | I | Command and Data select pin |
| 4 | RESET | I | Reset pin. |
| 5 | CS | I | Chip select pin |
| 6 | GND | P | Ground |
| 7 | VDD | P | power supply |
| 8 | LEDK | P | Power for LED backlight cathode |
| 9 | LEDA | P | Power for LED backlight anode |
| 10 | GND | P | Ground |
3.5 Power On/Off Sequence
The module requires a specific power sequencing procedure. The general guidelines are as follows:
- Power On: The VDD and VDDI (IOVCC) should ramp up without any specific timing requirement between them. The RESX pin should be held low during power stabilization. After the power rails are stable, release the reset (RESX high). The CSX chip select timing has no limit for positive edges. The timing for the final power-up to display on state is defined by the driver IC (ST7789P3).
- Power Off: To avoid permanent damage, the module must be powered off using the following sequence: Sleep-in, Display off, then power down the supplies. The RESET pulse falling edge must be at least 0ms in sleep-in mode. The backlight must be turned off before powering down the logic and interface signals.
Note: For a specific and guaranteed sequence, refer to the ST7789P3 driver IC datasheet.
3.6 Electro-Optical Characteristics
Measuring Condition: Ta=25±2°C, dark room.
| Item | Symbol | Condition | Min. | Typ. | Max. | Unit | Remark |
|---|---|---|---|---|---|---|---|
| Response time | Tr+Tf | θx = θy =0 | -- | 30 | 40 | ms | Note 1 |
| Contrast Ratio | CR | θx = θy =0 | -- | 1500 | -- | - | Note 2 |
| Transmittance | T% | θx = θy =0 | 4.25 | 5.0 | -- | % | - |
| Color Chromaticity (White) | W x | θx = θy =0 | -- | 0.291 | -- | - | - |
| Color Chromaticity (White) | W y | θx = θy =0 | -- | 0.314 | -- | - | - |
| Viewing angle (IPS) | θT, θB, θL, θR | CR > 10 | -- | 85 | -- | Deg. | Note 3 |
3.7 Inspection Standards & Quality Control
The module is manufactured and inspected according to GB/T 2828-2003 (normal inspection, Class II).
- AQL (Acceptable Quality Level): Major Defect: 0.65 | Minor Defect: 1.5
- Defect Classification (Examples):
- Major Defects: Include no display, missing line, flicker, overcurrent, voltage out of spec, pattern blur, Mura (ND filter 2% test), black tape missing, copper screen peel on FPC.
- Minor Defects: Include glass cracks (non-linear), pin-side conductive area damage, non-pin-side damage, polarizer scratches/fiber, FPC impurities, and black tape shift/defects.
- Visual Inspection Criteria: Visual inspection at 30cm distance under normal lighting conditions with a 30W light source at a 45-degree angle. The panel must be at rest during inspection.
3.8 Design Notes from Documentation
- Mechanical Design Recommendations:
- Suggested enclosure visible area should be 0.3mm smaller than the VAmds (Viewing Area) on each side. (Note 8)
- Suggested housing foam opening should be 0.6mm larger than the VAmds on each side. (Note 7)
- The edge of the Touch Panel (TP) must not contact any metal conductor. (Note 9)
- B/L Driver: The backlight driving condition is IF=60mA, Vf=3V (TYP) for a single LED. An external current source or current limiting resistor is required.
- Interface: The module uses a standard SPI interface with Chip Select (CS), Serial Clock (SCL), Data/Command (RS), and Serial Data (SDA). The reset pin (RESET) is active low.
- ESD Protection: A yellow insulating tape (黄色绝缘胶纸) is used for insulation on the back. Silver paste (银浆点) is used for grounding.
- IPS Display: This module features IPS (In-Plane Switching) technology providing a free viewing direction with 85 degrees in all four directions.
- RoHS: All materials are ROHS compliant.
- SPI Timing: The SPI timing parameters in the preliminary specification are marked as "TBD" (To Be Determined).
4. Application Guidelines & Critical Notes
- Power Supply: The module requires VDD (2.8V typical) power supply. Ensure the power supply is stable and has low ripple. The absolute maximum rating for VDD is 4.6V.
- Interface: This module uses a standard SPI protocol. The host processor must be configured for this protocol. Note that the SPI timing specifications in this revision are marked as "TBD" - refer to the driver IC (ST7789P3) datasheet for exact values.
- Backlight Driver (External): A simple constant current source or current limiting resistor can be used to supply the backlight via the LEDA (Pin 9) and LEDK (Pin 8) pins. The required driving condition is 60mA total current at 3V forward voltage.
- Reset: A hardware reset pin (RESET, Pin 4) is provided. Ensure the reset pulse is of adequate length and follows the power-on sequence.
- Mechanical Mounting: Follow the mechanical design notes for the enclosure and foam opening to ensure proper fit and avoid damage to the TP and LCD.
- Operating Temperature: The module operates from -20°C to +70°C. Satisfactory display performance is only guaranteed within this range.
- Storage: Store the module in a clean environment, free from dust, moisture, and direct sunlight. Storage temperature range is -30°C to +80°C.
- Handling Precautions: Handle the module with care to avoid damage to the glass or FPC. Ground yourself to prevent electrostatic discharge (ESD). The yellow insulating tape on the back should not be removed during installation.
5. Conclusion & Design-In Support
The LS0145I08-S-V1 from Lesson Smart Display Technology is a 1.45-inch IPS TFT-LCD module with an SPI interface. It features a high contrast ratio (1500:1 typical), a free viewing direction (85° all), and a compact mechanical design suitable for portable and wearable applications. It is a reliable, high-quality display solution suitable for a wide variety of 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 (ST7789P3) datasheet for detailed initialization and timing parameters.
- Design a clean 2.8V power supply for the LCD. Design a backlight constant current driver circuit capable of delivering 60mA at 3V.
- Configure the host processor's SPI interface to match the timing specifications from the ST7789P3 datasheet.
- Follow the mechanical design guidelines for the enclosure and foam opening to ensure proper fit and avoid damage.
- 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.
