LSL035I08-MP-V1 | 3.49 inch TFT-LCD | 640x480 | MIPI | COG+FPC+B/L+LENS
1. Executive Summary & Product Positioning
The LSL035I08-MP-V1 is a 3.49-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 module is a 3.49" VGA LCD module with a 640 × RGB × 480 dot matrix, featuring a COG+FPC+B/L+LENS structure and a white LED backlight. The document details the module's mechanical, electrical, optical characteristics, reliability test conditions, and packaging and storage precautions.
Product Positioning: Designed for applications requiring a high-resolution VGA display with a standard MIPI interface, wide viewing angles, and robust construction. With its 3.49-inch diagonal, VGA resolution, normally white mode, and integrated LENS, it is ideally suited for industrial panels, medical equipment, and other embedded systems that demand clear and reliable display performance.
2. Detailed Product Overview & Architecture
The module's architecture is designed for stable performance and straightforward integration. The primary components include:
- TFT-LCD Panel: 3.49-inch diagonal, a-Si TFT active matrix, transmissive, normally white display mode. The resolution is 640(RGB) × 480 (VGA) pixels.
- Driver IC: The module uses the FL7703N driver IC, which supports the MIPI interface.
- Backlight Unit (B/L): A white LED edge-lit backlight unit. The backlight configuration is 6 Chip-White LED, 6 Series 1 Connection. The driving condition is If=20mA, Vf=19.20±1.20V.
- Mechanical Construction: COG (Chip-on-Glass) + FPC + B/L + LENS. The module outline dimensions are approximately 76.95 × 73.08 × 2.78 mm (Note: from the mechanical drawing).
- Interface: The module communicates via a 30-pin 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) | 3.49 inches |
| Resolution (Dots) | 640(RGB) × 480 (VGA) |
| Display Technology | a-Si TFT, Transmissive, Active Matrix |
| Display Mode | Transmissive, Normally White |
| Module Construction | COG+FPC+B/L+LENS |
| Color Depth | 16.7M Colors |
| Viewing Direction | Normally White |
| Input Data Interface | MIPI |
| Driver IC | FL7703N |
| Operating Temperature | -20°C to +70°C |
| Storage Temperature | -30°C to +80°C |
| RoHS Compliance | Yes |
3.2 Electrical Specifications
3.2.1 DC Characteristics (Ta=25°C)
Power Supply Voltage (VDD-VSS): Min 2.8V, Typ 2.8V, Max 3.3V.
| Parameter | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Power Supply Voltage | VDD-VSS | 2.8 | 2.8 | 3.3 | V |
| Input Voltage "H" Level | VIH | 0.8VDD | — | VDD | V |
| Input Voltage "L" Level | VIL | VSS | — | 0.2VDD | V |
| Current Consumption | IDD | — | — | — | mA |
3.2.2 Backlight LED Characteristics
The backlight uses a 6 Chip-White LED, 6 Series 1 Connection configuration. The driving condition is If=20mA, Vf=19.20±1.20V.
| Parameter | Symbol | Condition | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| LED Module Forward Voltage | VF | IF=20mA | — | 19.2 | — | V |
| LCM Surface Luminance | LV | BM-7 | — | Reference sample | — | cd/m² |
| Uniformity | LD | BM-7 | 80 | — | — | % |
3.3 Interface & Pin Map (30-Pin Connector)
The module uses a 30-pin connector. The pinout integrates the MIPI interface, power supply, and backlight signals.
| Pin No. | Symbol | I/O | Description |
|---|---|---|---|
| 1, 2 | LCM LEDK | P | LED Backlight Cathode |
| 3, 4 | LCM LEDA | P | LED Backlight Anode (19.2V Typical) |
| 5, 22, 24 | NC | - | No Connection (Open) |
| 6, 9, 12, 15, 18, 21, 23, 29, 30 | GND | P | Ground |
| 7 | D0N | I | MIPI DSI Data 0 Negative |
| 8 | D0P | I | MIPI DSI Data 0 Positive |
| 10 | D1N | I | MIPI DSI Data 1 Negative |
| 11 | D1P | I | MIPI DSI Data 1 Positive |
| 13 | CLKN | I | MIPI DSI Clock Negative |
| 14 | CLKP | I | MIPI DSI Clock Positive |
| 16 | D2N | I | MIPI DSI Data 2 Negative |
| 17 | D2P | I | MIPI DSI Data 2 Positive |
| 19 | D3N | I | MIPI DSI Data 3 Negative |
| 20 | D3P | I | MIPI DSI Data 3 Positive |
| 25 | DSI_TE | O | Tearing Effect Output (Synchronization Signal) |
| 26 | LCM RESET | I | Chip Reset Signal (Low Active) |
| 27 | LCM I2C SCL (S8) | I | I2C Bus Clock Line |
| 28 | LCM I2C SDA (S8) | I/O | I2C Bus Data Line |
| 29 | LCM VDD (3.3V) | P | Power Supply (3.3V) |
| 30 | LCM IOVCC (1.8V) | P | I/O Power Supply (1.8V) |
3.4 Optical Specifications
Optical characteristics are measured at Ta=25°C.
| Item | Symbol | Condition | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| Viewing Angle (Horizontal) | θ₃, θ₉ | CR > 10 | 80 | 85 | - | Deg. |
| Viewing Angle (Vertical) | θ₁₂, θ₆ | CR > 10 | 80 | 85 | - | Deg. |
| Contrast Ratio | CR | Θ = 0° | 900 | 1200 | - | - |
| Color Gamut (NTSC) | - | CIE1931, Θ = 0° | 55 | 60 | - | % |
| White Chromaticity (CIE1931) | Wx, Wy | Θ = 0° | Typ -0.03 | 0.307, 0.338 | Typ +0.03 | - |
| Response Time (Tr+Td) | Tr+Td | Ta = 25°C, Θ = 0° | - | 25 | 35 | ms |
| Cross Talk | CT | Θ = 0° | - | - | 2.0 | % |
3.5 Reliability Condition
| Item No. | Item | Condition | Requirement |
|---|---|---|---|
| 1 | High Temperature Operating | 60°C±2°C for 60 hours | No defect in displaying and operation function |
| 2 | Low Temperature Operating | -20°C±2°C for 60 hours | No defect in displaying and operation function |
| 3 | High Temperature Storage | 70°C±2°C for 60 hours | No defect in displaying and operation function |
| 4 | Low Temperature Storage | -20°C±2°C for 60 hours | No defect in displaying and operation function |
| 5 | High Temp & Humidity Storage | 60°C±5°C, 90%RH, 60 hours | No defect in displaying and operation function |
| 9 | Drop Test | Packed, 100CM free fall 6 sides, 1 corner, 3 edges | No defect in displaying and operation function |
4. Application Guidelines & Critical Notes
When integrating the LSL035I08-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: VDD (3.3V) for the main logic and IOVCC (1.8V) for the I/O interface. The I/O voltage level must match the host's logic level.
- MIPI Interface (4-Lane + Clock): This is a full 4-lane MIPI DSI interface. The host processor must have a compatible MIPI DSI transmitter with 4 data lanes and a clock lane. 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. The module requires a high-voltage boost converter as the backlight consists of 6 LEDs in series with a typical forward voltage of 19.2V (max 20.4V). An external constant current driver is required, set to 20mA.
- I2C Touch Interface: The module includes pins for an I2C interface (SCL and SDA), likely for a touch panel or EEPROM. Ensure the host I2C bus voltage is compatible with IOVCC (1.8V).
- Mechanical Integration: The module includes a LENS (cover glass). The module outline dimensions are approximately 76.95 × 73.08 × 2.78 mm. The FPC is designed for bending.
- Handling Precautions: The module uses a glass LCD panel and LENS. Handle with care to avoid breakage. Protect the panel from static, as it may cause damage to the CMOS Gate Array IC. Use fingerstalls with soft gloves during handling.
- Storage Conditions: It is highly recommended to store the panel at a temperature from 0 to 35°C and a relative humidity of less than 70%. The panel shall be stored in a dark place.
- Cleaning: The desirable cleaners are water, IPA (Isopropyl Alcohol), or Hexane. Do not use Ketone type materials (e.g., Acetone), Ethyl alcohol, Toluene, Ethyl acid, or Methyl chloride.
- RoHS Compliance: This module is designed to comply with RoHS directives.
5. Conclusion & Design-In Support
The LSL035I08-MP-V1 from Lesson Smart Display Technology is a robust, high-resolution 3.49-inch TFT-LCD module designed for demanding industrial and embedded applications. Its combination of a standard 4-lane MIPI interface, full VGA resolution, wide viewing angles, and a rugged mechanical construction makes it an excellent choice for a wide variety of 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, mechanical drawings, and the FL7703N driver IC datasheet.
- Design the power supply to provide both VDD (3.3V) and IOVCC (1.8V) rails. Design a constant current backlight driver (20mA at ~19.2V).
- Develop firmware using the standard MIPI DSI protocol for the FL7703N 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 a wide range of products.
