LSC0395I12-MP-V1 3.95 inch TFT-LCD Module 480x480 16.7M Colors IPS
1. Executive Summary & Product Positioning
The LSC0395I12-MP-V1 is a 3.95-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, a capacitive touch panel (CTP), and a backlight unit. The panel size is 3.95 inch and the resolution is 480(RGB)*480, the panel can display up to 16.7M colors.
Product Positioning: This module integrates an IPS (In-Plane Switching) panel, offering superior viewing angles (All Views) and a high contrast ratio. It is designed as an "一体黑总成" (One-piece black assembly) with a built-in capacitive touch panel. It is well-suited for a wide range of applications such as industrial HMI, smart home devices, and other embedded systems requiring a bright, high-quality display with a fully integrated touch 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: 3.95-inch diagonal, a-Si TFT active matrix, transmissive, IPS mode. Resolution is 480(RGB) × 480 pixels with an active area (AA) of 71.86 (V) × 71.86 (H) mm.
- Driver IC: The module uses the ST7701SN driver IC, communicating via a MIPI DSI interface.
- Backlight Unit (B/L): A white LED backlight with 10 Chip-White LEDs configured in parallel. The typical driving condition is IF=200mA, Vf=3V (TYP).
- Mechanical Construction: COG (Chip-on-Glass) + FPC + B/L + CTP. The module is shipped as a bonded assembly with a glass lens (0.5mm) and a resistive touch panel. The total assembly thickness is 3.21 ± 0.2mm.
- Interface: The module uses a MIPI DSI interface with differential data pairs (D0P/D0N, D1P/D1N) and a clock pair (CLKP/CLKN). The CTP uses an IIC interface (SDA, SCL) with a GT911 IC (2-point touch).
- Display Mode: Transmissive, IPS, Normally Black.
- Viewing Direction: IPS (All O'Clock).
3. Exhaustive Technical Specifications
3.1 General & Mechanical Specifications
| Item | Specification |
| Display Size (Diagonal) | 3.95 inches |
| Resolution (Dots) | 480(RGB) × 480 |
| Display Technology | Active Matrix TFT, Transmissive, a-Si, IPS |
| Module Construction | COG+FPC+B/L+CTP (Capacitive Touch Panel) |
| Color Depth | 16.7M Colors |
| Viewing Direction | IPS (All O'Clock Views) |
| Input Data Interface | MIPI DSI (1 or 2 Data Lanes) |
| Driver IC | ST7701SN |
| Module Size (H×V×D) | 74.66 × 74.66 × 3.21 mm (Overall Assembly) |
| Active Area (AA, H×V) | 71.86 × 71.86 mm |
| Display Mode | Transmissive, IPS, Normally Black |
| Backlight Type | 10 Chip-White LED Parallel |
| CTP Controller IC | GT911 (2-point touch) |
| CTP Interface | IIC |
| Operating Temperature | -20°C to +70°C |
| Storage Temperature | -30°C to +80°C |
3.2 Electrical Characteristics
3.2.1 Recommended Operating Conditions
| Parameter | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Supply voltage | VCC | 2.5 | 2.8 | 3.6 | V |
| I/O supply voltage | IOVCC | 1.65 | 1.8 | 3.3 | V |
| Input voltage (L level) | VIL | VSS | -- | 0.3*IOVCC | V |
| Input voltage (H level) | VIH | 0.7*IOVCC | -- | IOVCC | V |
3.2.2 Backlight LED Characteristics
The backlight consists of 10 Chip-White LEDs in Parallel. The backlight drive condition is IF=200mA, Vf=3V (TYP).
| Parameter | Symbol | Typ | Unit |
|---|---|---|---|
| Forward Voltage | Vf | 3 | V |
| Forward Current | If | 200 | mA |
3.3 Interface Pin Assignment (Main LCD - 40-pin FPC)
Interface: MIPI DSI.
| PIN NO. | Symbol | I/O | Description |
|---|---|---|---|
| 1-8, 11, 14, 17, 19, 20, 22, 23, 24, 25 | GND | P | Ground |
| 9, 10 | D0N/D0P | I/O | MIPI DSI differential data pair 0 |
| 12, 13 | CLKN/CLKP | I | MIPI DSI differential clock pair |
| 15, 16 | D1N/D1P | I | MIPI DSI differential data pair 1 |
| 18 | RESET | I | Reset pin (Active low) |
| 21 | TE | O | IC Test / Tearing Effect output |
| 26, 27 | IOVCC | P | I/O Power supply |
| 28, 29 | VCC | P | Power supply |
| 30, 31 | GND | P | Ground |
| 32, 33 | LEDK | P | Backlight Cathode |
| 34, 35 | LEDA | P | Backlight Anode |
| 36-40 | GND | P | Ground |
3.4 Timing Characteristics: MIPI DSI High Speed Mode
The timing parameters for the MIPI DSI High-Speed data transmission are defined below.
| Signal | Symbol | Parameter | MIN | MAX | Unit | Description |
|---|---|---|---|---|---|---|
| DSI-CLK+/- | $2xU_{INSTA}$ | Double UI instantaneous | 4 | 25 | ns | -- |
| DSI-CLK+/- | $U_{INSTA}$ $U_{INSTB}$ | UI instantaneous halfs | 2 | 12.5 | ns | $U_{I}$ $U_{INSTA}$=$U_{INSTB}$ |
| DSI-Dn+/- | tDS | Data to clock setup time | 0.15 | - | UI | -- |
| DSI-Dn+/- | tDH | Data to clock hold time | 0.15 | - | UI | -- |
3.5 Design Notes from Documentation
- B/L Driver: The backlight driving condition is IF=200mA, Vf=3V (TYP) for 10 parallel LEDs.
- CTP: The Capacitive Touch Panel (CTP) uses a GT911 controller with an IIC interface. The touch panel is bonded to the module as a part of the "一体黑总成".
- Mechanical: Tolerance of segments to edge of glass: ±0.2mm. The module includes a "PI补强" (PI reinforcement) on the FPC. The total assembly thickness (LCM+CTP) is 3.21mm.
- 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.
- ESD: 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 MIPI DSI interface. The host processor must have a MIPI DSI controller capable of driving this interface.
- Backlight Driver (External): An external constant current driver is required to supply a typical current of 200mA at a forward voltage of 3V.
- Touch Panel (External): The integrated CTP requires an IIC interface from the host processor. The VDD for the CTP is typically 3.3V.
- Reset: A hardware reset pin (RESET, Pin 18) is provided. A reset pulse 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).
5. Conclusion & Design-In Support
The LSC0395I12-MP-V1 from Lesson Smart Display Technology is a 3.95-inch TFT-LCD module with an IPS panel and an integrated capacitive touch panel. It is a fully integrated "一体黑总成" solution suitable for a wide range of industrial and embedded display applications requiring a high-quality display with touch functionality.
For successful design-in, engineers should:
- Obtain and review the complete, official Product Specification (Revision 1.0) for the full mechanical drawing and the ST7701SN driver IC datasheet for detailed command initialization.
- Design suitable power supplies for VCC (2.8V), IOVCC (1.8V), and the CTP (3.3V). Design a backlight constant current driver circuit capable of delivering 200mA at 3V.
- Ensure the host processor has an available MIPI DSI interface and an IIC interface for the touch controller.
- 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, high-quality, and integrated display with touch solution for a wide array of applications.
