LSC397I04-MP-V2 | 3.97 inch TFT-LCD | 480x800 | MIPI DSI | IPS | With CTP
1. Executive Summary & Product Positioning
The LSC397I04-MP-V2 is a 3.97-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 3.97 inch and the resolution is 480(RGB)*800, the panel can display up to 16.7M colors. This module includes an integrated capacitive touch panel (CTP).
Product Positioning: Designed for a wide range of portable and industrial applications requiring a compact, portrait-mode display with wide viewing angles and a standard MIPI interface. The module features a typical brightness of 400 cd/m² and an IPS display mode for superior optical performance. With its integrated touch panel and compact mechanical design (59.4 × 108.319 × 3.675 mm), it is ideally suited for handheld devices, smart home controls, medical equipment, and other embedded display systems.
2. Detailed Product Overview & Architecture
The module's architecture is designed for robust performance and straightforward integration. The primary components include:
- TFT-LCD Panel: 3.97-inch diagonal, a-Si TFT active matrix, transmissive, IPS display mode. The resolution is 480(RGB) × 800 pixels with an active area of 51.84 (H) × 86.4 (V) mm.
- Driver IC: The module uses an ST7701S driver IC.
- Backlight Unit (B/L): A white LED edge-lit backlight unit. The backlight configuration is 5串2并 (5 strings of 2 LEDs in parallel = 10 LEDs total). The driving condition is 40mA total current with a typical forward voltage of 14V to 16V.
- Touch Panel (CTP): The module includes an integrated capacitive touch panel (CTP) with an I2C interface. The interface signals include CTP_RST, CTP_INT, CTP_SDA, and CTP_SCL, all operating at 1.8V logic levels. The touch power supply (CTP_VCC) is 2.8V.
- Mechanical Construction: COG (Chip-on-Glass) + FPC + B/L + CTP. The module outline dimensions are 59.4 × 108.319 × 3.675 mm.
- Interface: The module communicates via a 30-pin FPC connector. The main display interface is MIPI DSI (2 data lanes). The touch panel communicates via a standard I2C interface.
3. Exhaustive Technical Specifications
3.1 General & Mechanical Specifications
| Item | Specification |
| Display Size (Diagonal) | 3.97 inches |
| Resolution (Dots) | 480(RGB) × 800 |
| Display Technology | a-Si TFT, Transmissive, IPS |
| Module Construction | COG+FPC+B/L+CTP |
| Color Depth | 16.7M colors |
| Viewing Angle (All) | IPS (Full Viewing Angle) |
| Luminance (Brightness, Typ) | 400 cd/m² (Typ) / 450 cd/m² (Min) |
| Active Area (H×V) | 51.84 × 86.4 mm |
| Module Outline (H×V×D) | 59.4 × 108.319 × 3.675 mm |
| Interface | MIPI DSI (2 Data Lanes) |
| Backlight Configuration | White LED, 串2并 (10 LEDs Total) |
| Driver IC | ST7701S |
| Touch Interface | I2C (1.8V Logic) |
| Operating Temperature | -20°C to +70°C |
| Storage Temperature | -30°C to +80°C |
3.2 Interface & Electrical Specifications
3.2.1 Pin Description (30-Pin Connector)
The module uses a 30-pin connector. The pinout integrates the MIPI DSI interface, power supply, backlight, and touch panel signals. Key pins are described below:
| Pin No. | Symbol | I/O | Description |
|---|---|---|---|
| 1 | GND | P | Ground |
| 2 | CTP_RST | I | Touch Reset (1.8V) |
| 3 | CTP_INT | I | Touch Interrupt (1.8V) |
| 4 | CTP_SDA | I | Touch I2C Data (1.8V) |
| 5 | CTP_VCC | P | Touch Power Supply (2.8V) |
| 6 | CTP_SCL | I | Touch I2C Clock (1.8V) |
| 7 | GND | P | Ground |
| 8 | GND | P | Ground |
| 9 | LCM_AVDD | P | LCD Analog Power (NC) |
| 10 | LCM_AVEE | P | LCD Analog Power (NC) |
| 11 | LCM_VDD | P | LCD Logic Power (1.8V) |
| 12 | DSI_TE | O | Tearing Effect Output |
| 13 | LCM_ID | I | Module ID (GND) |
| 14 | LCM_RS | I | Reserved |
| 15 | LCM_VDD | P | LCD Logic Power (3.3V) |
| 16 | GND | P | Ground |
| 17 | D0N | I | MIPI DSI Data Lane 0 Negative |
| 18 | D0P | I | MIPI DSI Data Lane 0 Positive |
| 19 | GND | P | Ground |
| 20 | D1N | I | MIPI DSI Data Lane 1 Negative |
| 21 | D1P | I | MIPI DSI Data Lane 1 Positive |
| 22 | GND | P | Ground |
| 23 | CLKN | I | MIPI DSI Clock Lane Negative |
| 24 | CLKP | I | MIPI DSI Clock Lane Positive |
| 25 | GND | P | Ground |
| 26 | NC | - | No Connection |
| 27 | NC | - | No Connection |
| 28 | GND | P | Ground |
| 29 | NC | - | No Connection |
| 30 | NC | - | No Connection |
3.2.2 Electrical Characteristics
| Parameter | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Supply Voltage (Logic) | VCC | 2.5 | 2.8 | 3.6 | V |
| Supply Voltage (IO) | 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 |
3.2.3 Backlight Characteristics (LED circuit: 5串2并)
| Parameter | Symbol | Value | Unit | Condition |
|---|---|---|---|---|
| Forward Voltage | Vf | 14 ~ 16 | V | If=40mA |
| Forward Current (Total) | If | 40 | mA | - |
3.2.4 MIPI DSI High Speed Mode Timing Characteristics
The module supports MIPI DSI High Speed Mode with the following timing parameters:
| Parameter | Symbol | Min | Max | Unit |
|---|---|---|---|---|
| Double UI instantaneous | $2xU_{INSTA}$ | 4 | 25 | ns |
| UI instantaneous halfs | $U_{INSTA}=U_{INSTB}$ | 2 | 12.5 | ns |
| Data to Clock setup time | tDS | 0.15 | - | UI |
| Data to Clock hold time | tDH | 0.15 | - | UI |
| Reset pulse duration | TRW | 10 | - | us |
| Reset cancel time | TRT | - | 5 (Note) | ms |
Note: Based on available data from the specification. The reset cancel time may have a second, longer condition of up to 120ms.
3.3 Quality and Inspection Standards
The specification includes a comprehensive inspection standard based on GB/T 2828-2003 (Normal Inspection, Class II).
- Acceptable Quality Level (AQL):
- Major Defect: 0.65
- Minor Defect: 1.5
- Key inspection criteria include:
- Glass Defects: Cracks (reject), dimension conformity, glass extrusion, and chip damage on pin-side/non-pin-side.
- LCD Appearance Defects (View Area): Includes specifications for fibers, scratches, and polarizer defects. For example, scratches with a width ≤ 0.03mm are disregarded; scratches with a width between 0.05mm and 0.1mm with a length ≤3.0mm are allowed.
- Black Tape & Mara Tape: Specifications for FPC black tape alignment and tape application.
- Electrical Criteria (Major Defect): Includes rejection criteria for no display, missing lines, flicker, mura (tested with ND filter 2%), over current, voltage out of spec, and pattern errors.
- Black/White Dots and Dirty Dots: Specific allowable counts based on dot diameter (φ). Dots with φ ≤ 0.15mm are disregarded; 2 dots allowed if 0.15mm < φ ≤ 0.25mm; 1 dot allowed if 0.25mm < φ ≤ 0.3mm; 0 dots allowed if φ > 0.3mm.
4. Application Guidelines & Critical Notes
When integrating the LSC397I04-MP-V2 module, engineers must adhere to the specific guidelines outlined in the specification to ensure optimal performance and reliability.
- Power Supply (Multi-rail): This module requires multiple power supply rails: VCC (2.8V) for the LCD main logic, IOVCC (1.8V) for the MIPI and control IO interface, and CTP_VCC (2.8V) for the touch controller. Correct power sequencing (VCC -> IOVCC -> Reset -> Interface -> Data -> Backlight) is critical for reliable operation.
- IO Voltage Level (1.8V): All MIPI and control-related IOs (Reset, TE, CTP RST/INT/SDA/SCL) operate at 1.8V logic levels. The host processor must be compatible or level-shifting must be used.
- Backlight Driver (External): The backlight requires an external constant current driver set to 40mA (total), with a forward voltage of 14V to 16V. The LED configuration is 5串2并 (5 strings of 2 LEDs in parallel = 10 LEDs total).
- MIPI DSI Interface: The module uses a standard MIPI DSI interface with 2 data lanes. Ensure that the host processor's MIPI DSI transmitter is compatible and can be configured for the correct number of lanes and data rate (UI instantaneous between 2ns and 12.5ns). Proper PCB layout for differential pairs (100-ohm impedance) is critical.
- Mechanical Integration: The specification provides a detailed mechanical outline drawing (DRAW NO: HSC5448). Key dimensions include module size (59.4 × 108.319 × 3.675 mm), active area (51.84 × 86.4 mm), and the FPC bending diagram for product design. Tolerances: .XX ± 0.20mm, .XXX ± 0.10mm.
- Handling Precautions: The panel is made of glass and can break if dropped. CMOS LSI is used, so static electricity precautions must be taken. Do not operate the module when condensation forms inside. Avoid strong mechanical shock to the polarizer.
- RoHS & Halogen-Free Compliance: This module is designed to comply with EU RoHS and halogen-free requirements as per the document's material management standards.
5. Conclusion & Design-In Support
The LSC397I04-MP-V2 from Lesson Smart Display Technology is a compact and versatile 3.97-inch TFT-LCD module. Its combination of a standard MIPI interface, IPS display mode (ST7701S driver), integrated capacitive touch panel, and clear inspection standards makes it a well-rounded choice for a wide variety of portable, smart home, and embedded applications.
For design-in support, it is strongly recommended to:
- Obtain and review the full Product Specification (Revisions 1.0) for the complete set of electrical timing parameters, mechanical outline drawings, and the CTP specification.
- Design the power supply section following the recommended power sequence for the multiple rails (VCC 2.8V, IOVCC 1.8V, TP_VDD 2.8V) and the backlight driver (40mA at 14-16V).
- Use the mechanical drawing (DRAW NO: HSC5448) to create an accurate enclosure design, paying particular attention to the module's physical dimensions and the specified tolerances.
- Contact the manufacturer for evaluation kits, sample requests, and technical support during the design-in phase.
This module is engineered to deliver consistent, bright, and reliable display performance for a variety of applications.
