LS035I14-MP-V1 3.45 inch TFT-LCD Module 640x480 16.7M Colors
1. Executive Summary & Product Positioning
The LS035I14-MP-V1 is a 3.45-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 panel size is 3.45 inch and the resolution is 640(RGB)*480, the panel can display up to 16.7M colors.
Product Positioning: This module is well-suited for a wide range of applications requiring high color performance and stable drive, such as industrial control panels, medical equipment, and other embedded display systems.
2. Detailed Product Overview & Architecture
The module's architecture is designed for robust performance and easy integration. The primary components include:
- TFT-LCD Panel: 3.45-inch diagonal, a-Si TFT active matrix, transmissive, IPS (In-Plane Switching) mode. Resolution is 640(RGB) × 480 pixels.
- Driver Circuit: The module integrates a Driver IC (FL7703N), communicating via an MIPI (4 Data Lanes) Interface.
- Backlight Unit (B/L): A white LED backlight with 6 Chip-White LEDs configured in series. The typical driving condition is IF=20mA, Vf=19.2V (TYP).
- Mechanical Construction: COG (Chip-on-Glass) + FPC (with PI reinforcement, total thickness ~0.30mm) + B/L. The total module dimensions are 76.84 (W) × 63.84 (H) × 3.07 (D) mm.
- Interface: The module communicates via a 31-pin FPC connector. The display interface is MIPI-DSI (4 Data Lanes).
- Display Mode: Active matrix TFT, Transmissive type, Normally White (IPS).
- RoHS: All materials are compliant with RoHS standards.
3. Exhaustive Technical Specifications
3.1 General & Mechanical Specifications
| Item | Specification |
| Display Size (Diagonal) | 3.45 inches |
| Resolution (Dots) | 640(RGB) × 480 |
| Display Technology | Active Matrix TFT, Transmissive, a-Si, Normally White (IPS) |
| Module Construction | COG+FPC+B/L |
| Color Depth | 16.7M Colors |
| Input Data Interface | MIPI-DSI (4 Data Lanes) |
| Driver IC | FL7703N |
| Module Size (H×V×D) | 76.84 × 63.84 × 3.07 mm |
| Active Area (AA, H×V) | 70.08 × 52.56 mm |
| Pixel Arrangement | RGB Dot-matrix (640(RGB)×480) |
| Display Mode | Transmissive, Normally White |
| Backlight Type | 6 Chip-White LEDs, Series |
| Operating Temperature | -20°C to +70°C |
| Storage Temperature | -30°C to +80°C |
| Environmental Compliance | RoHS |
3.2 Electrical Characteristics
3.2.1 Recommended Operating Conditions
Condition: IOVCC=1.65V to 3.3V, VDD=2.5V to 3.3V, AGND=DGND=0V, Ta=25°C.
| Item | Symbol | Min | Max | Unit | Remark |
|---|---|---|---|---|---|
| Supply voltage (LCM_VDD) | VDD | 2.5 | 3.3 | V | Pin 28 |
| Supply voltage (IO) | IOVCC | 1.65 | 3.3 | V | Pin 27 |
3.2.2 Backlight LED Characteristics
The backlight consists of 6 Chip-White LEDs in series. The driving condition is IF=20mA, Vf=19.2V (TYP).
| Parameter | Symbol | Typ | Unit |
|---|---|---|---|
| Forward Voltage | Vf | 19.2 | V |
| Forward Current (Total) | IF | 20 | mA |
3.3 Interface Pin Assignment (31-Pin FPC)
The module communicates via a 31-pin FPC connector. The interface is MIPI-DSI (4 Data Lanes).
| PIN NO. | Symbol | I/O | Description |
|---|---|---|---|
| 1-2 | LEDK | P | Power for LED backlight cathode |
| 3-4 | LEDA | P | Power for LED backlight anode |
| 5 | NC | - | No Connection |
| 6 | GND | P | Ground |
| 7 | D0N | I/O | MIPI DSI differential data pair (Lane 0) |
| 8 | D0P | I/O | MIPI DSI differential data pair (Lane 0) |
| 9 | GND | P | Ground |
| 10 | D1N | I | MIPI DSI differential data pair (Lane 1) |
| 11 | D1P | I | MIPI DSI differential data pair (Lane 1) |
| 12 | GND | P | Ground |
| 13 | CLKN | I | MIPI DSI differential clock pair |
| 14 | CLKP | I | MIPI DSI differential clock pair |
| 15 | GND | P | Ground |
| 16 | D2N | I | MIPI DSI differential data pair (Lane 2) |
| 17 | D2P | I | MIPI DSI differential data pair (Lane 2) |
| 18 | GND | P | Ground |
| 19 | D3N | I | MIPI DSI differential data pair (Lane 3) |
| 20 | D3P | I | MIPI DSI differential data pair (Lane 3) |
| 21 | GND | P | Ground |
| 22 | GND | P | Ground |
| 23 | NC | - | No Connection |
| 24 | GND | P | Ground |
| 25 | TE | O | Tearing Effect output pin (or NC) |
| 26 | NC | - | No Connection |
| 27 | LCM_IOVCC(1.8V) | P | Power supply for logic |
| 28 | LCM_VDD(3.3V) | P | Power supply for TFT |
| 29 | GND | P | Ground |
| 30 | GND | P | Ground |
| 31 | LCM_RESET | I | LCD Reset pin (implied from drawing) |
3.4 Timing Characteristics (DSI High Speed Mode)
Condition: IOVCC=1.65V to 3.3V, VDD=2.5V to 3.3V, TA = -30 to 70°C. The module operates with a 4-lane MIPI DSI interface. Timing parameters below are based on the internal DSI 3.4.1 DSI High Speed Mode Characteristics
Condition: IOVCC=1.65V to 3.3V, VDD=2.5V to 3.3V, TA = -30 to 70°C.
| Signal | Item | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| DSI_CP/DSI_CN | Double UI instantaneous | 2xUINST | 3.30 | - | 25 | ns |
| DSI_CP/DSI_CN | UI instantaneous | UINSTA/UINSTB | 1.67 | - | 12.5 | ns |
| DP/DN | Data to clock setup time | TDS | 0.15*UI | - | - | ps |
| DP/DN | Data to clock hold time | TDH | 0.15*UI | - | - | ps |
| DSI_CP/DSI_CN | Differential rise time (Clock) | TDRTCLK | 150 | - | 0.3*UI | ps |
| DSI_CP/DSI_CN | Differential fall time (Clock) | TDFTCLK | 150 | - | 0.3*UI | ps |
| DP/DN | Differential rise time (Data) | TDRTDATA | 150 | - | 0.3*UI | ps |
| DP/DN | Differential fall time (Data) | TDFTDATA | 150 | - | 0.3*UI | ps |
3.5 Design Notes from Documentation
- B/L Driver: The backlight driving condition is IF=20mA, Vf=19.2V (TYP) for 6 LEDs in series. An external boost converter is required.
- Mechanical: The LCM module has a total thickness of 3.07 mm (including the metal frame). The FPC with PI reinforcement has a total thickness of 0.30±0.03 mm. A silver paste dot (银浆点) is used for grounding. The Part Number label is LS035I14-MP-V1.
- FPC Connection: The module includes a specified FPC bend area (yellow insulating tape area). The FPC has been extended by 12mm from the base model.
- Steel Sheet Reinforcement: The back of the FPC has a steel sheet reinforcement (T=0.1mm) for grounding.
- Connector: The module uses a 31-pin FPC connector with a 0.5mm pitch.
- RoHS: All materials are compliant with RoHS standards.
4. Application Guidelines & Critical Notes
- Power Supply: The module requires a 3.3V (LCM_VDD) power supply for the TFT and a 1.8V (LCM_IOVCC) supply for the logic interface. Ensure the power supply ripple is minimized.
- Interface: This module uses a standard MIPI DSI (4-lane) protocol. The host processor must be configured for this protocol.
- Backlight Driver (External): An external boost converter is required to supply the high-voltage backlight via the LEDA and LEDK pins. The required driving condition is 20mA total current at 19.2V forward voltage (Typ).
- Reset: A hardware reset pin (LCM_RESET) is provided. The reset pulse duration must be at least 10 µs. It is necessary to wait 5ms after releasing RESX before sending commands. Also Sleep Out command cannot be sent for 120msec.
- Operating Temp: The module operates from -20°C to +70°C. Below 0°C, the response time of the liquid crystal becomes slower.
- Storage: Storage temperature range is -30°C to +80°C.
- Handling Precautions: Handle the module with care to avoid damage to the glass or FPC. Ground yourself to prevent electrostatic discharge (ESD). Avoid applying pressure to the display surface.
5. Conclusion & Design-In Support
The LS035I14-MP-V1 from Lesson Smart Display Technology is a 3.45-inch IPS TFT-LCD module with a 4-lane MIPI interface and 640x480 resolution. It is a reliable and high-quality display solution suitable for a wide variety of industrial and consumer embedded display applications.
For successful design-in, engineers should:
- Obtain and review the complete, official Product Specification (Revision 1.0) for the full mechanical drawing and the driver IC (FL7703N) datasheet for detailed initialization and timing parameters.
- Design a clean 3.3V/1.8V power supply for the LCD. Design a backlight boost converter and constant current driver circuit capable of delivering 20mA at 19.2V.
- Configure the host processor's MIPI DSI (4-lane) interface to match the timing specifications detailed in this datasheet.
- 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 and vibrant display solution for a wide array of applications.
