Product Subtitle / Keywords:
3.97 Inch Display, 480(RGB)×800 Resolution, Transmissive a-Si TFT-LCD, MIPI Interface, COG+FPC+B/L, 16.7M Colors, 40-Pin, FL7703N Driver, 58.26×98.1×2.55 mm, 500 cd/m² Brightness, 800:1 Contrast Ratio, IPS, -20°C~70°C Operating Temperature
1. Executive Summary & Product Positioning
The LS0397I02-MP-V1, developed by Lixin (Wan‘an) Intelligent Display Technology Co., Ltd. (立信(万安)智显科技有限公司), is a 3.97-inch transmissive amorphous Silicon TFT-LCD (a-Si TFT-LCD) module.
This product specification (Revision 1.0, Module Type: COG+FPC+B/L) serves as the definitive technical document, defining its structural composition (TFT-LCD panel, a driver circuit and a backlight unit), physical features, mechanical dimensions, absolute maximum ratings, detailed electrical characteristics, complete MIPI interface pinout, and comprehensive electro-optical performance. It delivers a resolution of 480(RGB)×800 with 16.7M-color display capability, driven by the FL7703N controller.
The document provides the core parameters necessary for system integration into embedded display applications requiring a standard portrait-oriented display with a high-speed serial interface. The unequivocal recommendation for engineers is to strictly adhere to the electrical specifications, interface timing, and mechanical tolerances described herein to ensure reliable performance and compatibility.
2. Detailed Product Overview & Architecture
- Core Technology: Transmissive-type a-Si TFT-LCD (amorphous silicon thin film transistor liquid crystal display).
- Display Mode: Active matrix TFT-LCD module, which is composed of a TFT-LCD panel, a driver circuit and a backlight unit.
- Display Format: Graphic 480(RGB)×800 Dot-matrix.
- Display Characteristics: Capable of displaying up to 16.7 million colors.
- Module Construction: COG (Chip-On-Glass) + FPC (Flexible Printed Circuit) + B/L (Backlight Unit).
- Input Data: MIPI.
- Viewing Direction: IPS (In-Plane Switching).
- Drive IC: FL7703N.
- Connector Pin Count: 40-Pin.
- Approval Status: ☑ Approved Product Specification only (as per signature block).
3. Exhaustive Technical Specifications
3.1 Mechanical & Physical Specifications
| Item | Specification | Unit |
|---|---|---|
| Module size (H×V×D) | 58.26 × 98.1 × 2.55 | mm |
| Active area (H×V) | 51.84 × 86.4 | mm |
| Number of dots / Resolution | 480(RGB) × 800 | pixel |
| Panel Size (Diagonal) | 3.97 | inch |
| Pixel Pitch (H×V) | 0.108 × 0.108 | mm |
Critical Mechanical Design Notes (from outline dimension drawing):
- Overall Module Thickness: 2.55 mm.
- Pixel Pitch: 0.108 mm (standard density for a 3.97-inch display).
- Display Type: 3.97”, TFT LCD, IPS.
- Display Mode: Transmissive, Mode Positive.
- Viewing Direction: IPS.
- Driver IC: FL7703N.
- VCC: 2.8V, IOVCC: 1.8V.
- Operating Temperature: -20°C ~ 70°C.
- Storage Temperature: -30°C ~ 80°C.
- Backlight: 6 Chip-White LEDs (2 Strings, 3 Series per String).
- Key Dimension: Referenced Dimension: ().
- Environmental Protection: RoHS.
- General Tolerance: ±0.20 mm (unless otherwise specified).
- Angular Tolerance: ∠ ±1/4°.
- FPC Total Thickness: PI补强+FPC总厚=0.30±0.03mm.
- FPC Pin Count: 40 pins.
- FPC Bending: The module supports FPC bending for space-constrained designs.
3.2 Electrical & Interface Specifications
3.2.1 Pin Description (40-pin FPC)
| PIN | SIGNAL | Description |
|---|---|---|
| 1 | GND | Ground |
| 2 | D0N | MIPI-DSI Data signal input (Data lane 0) |
| 3 | D0P | MIPI-DSI Data signal input (Data lane 0) |
| 4 | GND | Ground |
| 5 | D1N | MIPI-DSI Data signal input (Data lane 1) |
| 6 | D1P | MIPI-DSI Data signal input (Data lane 1) |
| 7 | GND | Ground |
| 8 | CLKN | MIPI-DSI Clock signal input |
| 9 | CLKP | MIPI-DSI Clock signal input |
| 10 | GND | Ground |
| 11 | D2N | MIPI-DSI Data signal input (Data lane 2) |
| 12 | D2P | MIPI-DSI Data signal input (Data lane 2) |
| 13 | GND | Ground |
| 14 | D3N | MIPI-DSI Data signal input (Data lane 3) |
| 15 | D3P | MIPI-DSI Data signal input (Data lane 3) |
| 16 | GND | Ground |
| 17 | NC | No Connection |
| 18 | NC | No Connection |
| 19 | NC | No Connection |
| 20 | GND | Ground |
| 21 | NC | No Connection |
| 22 | NC | No Connection |
| 23 | NC | No Connection |
| 24 | GND | Ground |
| 25 | NC | No Connection |
| 26 | NC | No Connection |
| 27 | RESET | Reset input pin |
| 28 | SDA | I2C Serial Data |
| 29 | SCL | I2C Serial Clock |
| 30 | GND | Ground |
| 31 | VCC | Power supply (2.8V) |
| 32 | IOVCC | I/O power supply (1.8V) |
| 33 | GND | Ground |
| 34 | LEDK2 | Backlight Cathode (String 2) |
| 35 | LEDA2 | Backlight Anode (String 2) |
| 36 | LEDK1 | Backlight Cathode (String 1) |
| 37 | LEDA1 | Backlight Anode (String 1) |
| 38 | GND | Ground |
| 39 | GND | Ground |
| 40 | NC | No Connection |
Interface Summary:
- MIPI Interface: Uses 4 data lanes (D0-D3) and 1 clock lane for high-speed serial data transmission.
- Backlight: Dedicated LEDA1/LEDK1 (Pins 37, 36) and LEDA2/LEDK2 (Pins 35, 34) pins for the backlight strings.
- Power: VCC (Pin 31) for main logic (2.8V), IOVCC (Pin 32) for I/O interface (1.8V), GND (Pins 1, 4, 7, 10, 13, 16, 20, 24, 30, 33, 38, 39) for ground.
- Control: RESET (Pin 27) for hardware reset.
- I2C Interface: SCL (Pin 29) and SDA (Pin 28) for register configuration.
- Unused Pins: Pins 17-19, 21-23, 25, 26, 40 are NC — leave floating.
3.2.2 Backlight Unit
| Item | Specification | Unit |
|---|---|---|
| LED Circuit Configuration | 6 Chip-White LEDs (2 Strings, 3 Series per String) | — |
| Drive Condition (Total) | IF = 40mA, Vf = 16.8~19.2V | — |
Backlight Circuit Notes:
- The backlight has two separate anode/cathode pairs (LEDA1/LEDK1 and LEDA2/LEDK2).
- Each string requires 20 mA (3 series LEDs per string × 2 strings = 40 mA total, typically 19.2V total for 3 series LEDs).
3.3 Optical & Electro-Optical Characteristics
| Item | Symbol | Condition | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|---|
| Brightness (Center) | L | — | — | 500 | — | cd/m² |
| Contrast Ratio | CR | θx = θy = 0 | — | 800 | — | — |
| Response Time (Tr+Tf) | Tr+Tf | — | — | — | — | ms |
| Viewing Angle (CR>10) | θL/θR/θU/θD | — | — | 89/89/89/89 | — | deg |
3.4 Version Record
| Version | Revise Date | Page | Content |
|---|---|---|---|
| 00 | 2024-04-10 | ALL | New released |
4. Application Guidelines & Critical Notes
Intended Use
- Smart home control panels (e.g., smart speakers, thermostats)
- Wearable devices and smartwatches
- Automotive aftermarket displays (center console, instrument cluster)
- IoT edge devices requiring standard portrait display
Critical Design Considerations
-
Interface (MIPI with 4 Data Lanes): This module uses a MIPI-DSI interface with 4 data lanes and 1 clock lane. The host MCU must have a MIPI-DSI controller that supports at least 4 data lanes.
-
Power Supply:
- Provide stable VCC (2.8V) for the main logic (connected to Pin 31).
- Provide stable IOVCC (1.8V) for the I/O interface (connected to Pin 32).
- The backlight requires a constant-current LED driver with two output channels (one for LEDA1/LEDK1 and another for LEDA2/LEDK2), set to 20 mA per channel for a total of 40 mA at approximately 16.8V to 19.2V.
-
Mechanical Integration:
- Module Outline: 58.26mm (H) × 98.1mm (V) × 2.55mm (D). This is a standard portrait-oriented module.
- Active Area: 51.84mm × 86.4mm — a standard 3.97-inch portrait display.
- FPC: The module uses a 40-pin FPC that supports bending for space-constrained designs.
-
Optical Performance:
- IPS Display: Offers wide viewing angles with no grayscale inversion (89 degrees in all directions).
- High Brightness: 500 cd/m² (Typ) ensures excellent readability in bright environments.
- High Contrast Ratio: 800:1 (Typ) for sharp and clear images.
-
Temperature Limits:
- Operating Temperature: -20°C to +70°C.
- Storage Temperature: -30°C to +80°C.
Handling & Compliance
- The module is RoHS compliant.
- Observe standard ESD precautions during handling and assembly.
- The module contains fragile glass and a 40-pin FPC – handle with care.
- Avoid bending the FPC sharply, especially near the connector interface.
5. Conclusion & Design-In Support
The LS0397I02-MP-V1 specification details a standard 3.97-inch portrait display module with a MIPI interface, FL7703N driver, and IPS technology — an excellent choice for applications requiring a standard portrait display with a high-speed serial interface.
Key Strengths:
-
Standard Portrait Resolution (480×800): Widely supported by many MCUs and graphics libraries, simplifying software development.
-
MIPI Interface with 4 Data Lanes: Provides high bandwidth for smooth video and animation playback.
-
High Brightness: 500 cd/m² (Typ) ensures excellent readability even in bright environments.
-
High Contrast Ratio: 800:1 (Typ) provides outstanding image quality.
-
IPS Technology: Provides superior, consistent image quality from any viewing angle.
-
FPC Bending Support: The module supports FPC bending for space-constrained designs.
-
I2C Interface: The module includes an I2C interface (SCL/SDA) for register configuration.
Main Design Focus:
- The critical design task is properly implementing the MIPI-DSI interface with 4 data lanes to ensure reliable high-speed data transfer.
- Supporting requirements:
- Provide stable VCC (2.8V) and IOVCC (1.8V) power.
- Provide a dual-channel constant-current backlight driver set to 20 mA per channel (40 mA total) at 19.2V (Typ) .
- Mechanical integration — the module outline is 58.26mm × 98.1mm × 2.55mm.
- FPC connector — verify the 40-pin FPC and consider FPC bending if needed.
This module is an excellent choice for smart home, IoT, and any embedded application requiring a standard portrait display with excellent image quality, wide viewing angles, and a high-speed MIPI interface.
