LSL0397I06-MP-V1 | 3.97 inch TFT-LCD | 480x800 | MIPI | COG+FPC+B/L+LENS
1. Executive Summary & Product Positioning
The LSL0397I06-MP-V1 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.
Product Positioning: Designed for a wide range of portable and industrial display applications requiring a high-resolution WVGA display with a standard MIPI interface. With its 3.97-inch diagonal, high 480x800 resolution, wide viewing angle (IPS) and integrated LENS, it is ideally suited for smart home controls, portable instruments, and other embedded human-machine interfaces.
2. Detailed Product Overview & Architecture
The module's architecture is designed for high performance and robust 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 (WVGA) pixels.
- Driver IC: The module uses the ST7701SN driver IC, which supports a MIPI interface.
- Backlight Unit (B/L): A white LED edge-lit backlight unit. The driving condition is If=40mA, Vf=15V.
- Mechanical Construction: COG (Chip-on-Glass) + FPC + B/L + LENS (Cover Lens). The module outline dimensions are approximately 62.24 (H) × 106.70 (V) mm (from the mechanical drawing).
- Interface: The module communicates via a connector. The main display interface is MIPI (Mobile Industry Processor Interface).
3. Exhaustive Technical Specifications
3.1 General & Mechanical Specifications
| Item | Specification |
| Display Size (Diagonal) | 3.97 inches |
| Resolution (Dots) | 480(RGB) × 800 (WVGA) |
| Display Technology | Active Matrix TFT, Transmissive, a-Si |
| Module Construction | COG+FPC+B/L+LENS |
| Color Depth | 16.7M Colors |
| Viewing Direction (Grayscale Inversion) | Free (IPS) |
| Input Data Interface | MIPI |
| Driver IC | ST7701SN |
| Operating Temperature | -20°C to +70°C |
| Storage Temperature | -30°C to +80°C |
3.2 Electrical Specifications
3.2.1 Absolute Maximum Ratings
| Parameter | Symbol | Min | Max | Unit |
|---|---|---|---|---|
| Supply voltage (VCC) | VCC | -0.3 | 4.6 | V |
| Supply voltage (IOVCC) | IOVCC | -0.3 | 4.6 | V |
| Operating Temperature | TOPR | -10 | 60 | °C |
| Storage Temperature | TSTR | -20 | 70 | °C |
3.2.2 DC Characteristics (Ta=25°C)
| Parameter | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Supply Voltage (VCC) | VCC | 2.5 | 2.8 | 3.6 | V |
| Supply Voltage (IOVCC) | IOVCC | 1.65 | 1.8 | 3.3 | V |
| Input Voltage (Low Level) | VIL | 0 | -- | 0.3*IOVCC | V |
| Input Voltage (High Level) | VIH | 0.7*IOVCC | -- | IOVCC | V |
3.2.3 Backlight LED Characteristics
The backlight driving condition is If=40mA, Vf=15V.
3.3 Interface & Pin Map
The module uses a MIPI DSI interface. The pinout integrates the MIPI interface, power supply, and backlight signals. (Note: The mechanical drawing provides a partial pin list with symbols such as OVCC, VDD2.8, GND, CS, SCK, SDA, RESET, etc., suggesting this module also supports an SPI interface for configuration.)
3.4 Optical Specifications
Optical characteristics are measured at θx = θy = 0°, Ta=25°C.
| Item | Symbol | Condition | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| Response Time (Tr+Tf) | Tr+Tf | θx = θy = 0° | -- | 35 | -- | ms |
| Contrast Ratio | CR | θx = θy = 0° | 550 | 800 | -- | -- |
| Transmittance | T% | θx = θy = 0° | 3.34 | 3.93 | -- | % |
| Color Chromaticity (White) - CIE1931 | Wx, Wy | θx = θy = 0° | -- | 0.292, 0.333 | -- | -- |
| Viewing Angle (All Directions) | θT, θB, θL, θR | CR > 10 | 80 | 85 | -- | Deg. |
3.5 Interface Timing Characteristics (MIPI DSI)
The module supports MIPI DSI interface with the following key parameters (Test Condition: VDDI=1.8V, VDD=2.8V, AGND=DGND=0V, Ta=25°C).
3.5.1 High Speed (HS) Mode Characteristics
| Signal | Item | Symbol | Min | Max | Unit |
|---|---|---|---|---|---|
| DSI-CLK+/- | Double UI instantaneous | 2xUINSTA | 2.5 | 25 | ns |
| DSI-CLK+/- | UI instantaneous halfs | UINSTA UINSTB | 1.25 | 12.5 | ns |
| DSI-Dn+/- | Data to clock setup time | tDS | 0.15 | -- | UI |
| DSI-Dn+/- | Data to clock hold time | tDH | 0.15 | -- | UI |
3.5.2 Reset Timing
| Parameter | Symbol | Min | Max | Unit |
|---|---|---|---|---|
| Reset pulse duration | TRW | 10 | -- | us |
| Reset cancel | TRT | -- | 5 (Note 1,5) | ms |
| Reset cancel | TRT | -- | 120 (Note 1, 6, 7) | ms |
Note: Spike rejection applies. A reset pulse shorter than 5us is rejected. Reset starts between 5us and 9us. A longer than 9us pulse resets the module.
4. Application Guidelines & Critical Notes
When integrating the LSL0397I06-MP-V1 module, engineers must adhere to the specific guidelines outlined in the specification to ensure optimal performance and reliability.
- Power Supply (Dual Rail): The module requires two supply rails: VCC (2.8V) for internal analog power and IOVCC (1.65V-3.3V) for the I/O interface. The I/O voltage level must match the host's logic level.
- MIPI Interface (DSI): This is a MIPI DSI interface. The host processor must have a compatible MIPI DSI transmitter. The PCB layout for the differential pairs must be carefully designed for controlled impedance (100-ohm differential) and matched trace lengths.
- Backlight Driver (External): The module provides separate LED Anode (LEDA) and Cathode (LEDK) pins. An external constant current driver is required, set to 40mA with a maximum forward voltage of 15V.
- Mechanical Integration: The module includes a LENS (cover glass). Critical mechanical guidelines include: The enclosure viewing area should be 0.3mm smaller than the LENS VA per side, and the foam opening should be 0.6mm larger than the VA MDS per side. The TP edge cannot contact metal conductors.
- Handling Precautions: The module uses a glass LCD panel and LENS. Handle with care to avoid breakage. The module is RoHS compliant.
- Reset Timing: The reset pulse must be at least 10us wide. A pulse shorter than 5us is rejected. If reset is applied during Sleep Out mode, the display will blank for up to 120ms.
5. Conclusion & Design-In Support
The LSL0397I06-MP-V1 from Lesson Smart Display Technology is a well-designed 3.97-inch TFT-LCD module. Its combination of a high resolution (480x800), standard MIPI interface, wide viewing angle (IPS), and integrated LENS makes it a suitable choice for a wide variety of portable and industrial display applications.
For design-in support, it is strongly recommended to:
- Obtain and review the full Product Specification (Revision 1.0) for the complete set of electrical parameters, interface timing diagrams, and mechanical drawings.
- Design the power supply to provide both VCC (2.8V) and IOVCC rails. Design a constant current backlight driver (40mA at ~15V).
- Develop firmware using the standard MIPI DSI protocol for the ST7701SN driver IC.
- Contact the manufacturer for evaluation kits, sample requests, and technical support during the design-in phase.
This module is engineered to deliver reliable, clear, and premium-quality display performance for modern electronic products.
