LS0395I15-MP-V1 3.95 inch TFT-LCD Module 720x720 16.7M Colors IPS
1. Executive Summary & Product Positioning
The LS0395I15-MP-V1 is a 3.95-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 3.95 inch and the resolution is 720(RGB)*720, the panel can display up to 16.7 M colors.
Product Positioning: This module features an IPS (In-Plane Switching) panel, offering wide viewing angles (up to 85 degrees in all directions) and good color reproduction. It is well-suited for applications requiring a compact, square-format, high-resolution display such as smart home devices, medical instruments, industrial HMI, and other embedded 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: 3.95-inch diagonal, a-Si TFT active matrix, transmissive, IPS mode. Resolution is 720(RGB) × 720 pixels with an active area of 71.93 (H) × 71.93 (V) mm.
- Driver IC: The module uses the FL7703N driver IC.
- Backlight Unit (B/L): A white LED backlight configuration of 6-series 2-parallel. The typical driving condition is IF=40mA and Vf=18V (Typ.).
- Mechanical Construction: COG (Chip-on-Glass) + FPC + B/L. The module outline dimensions are 74.83 (H) × 78.98 (V) × 2.07 (D) mm.
- Interface: The module communicates via a 24-pin FPC connector. It supports a MIPI DSI interface for command and pixel data.
- Viewing Direction: IPS (All directions).
3. Exhaustive Technical Specifications
3.1 General & Mechanical Specifications
| Item | Specification |
| Display Size (Diagonal) | 3.95 inches |
| Resolution (Dots) | 720(RGB) × 720 |
| Display Technology | Active Matrix TFT, Transmissive, a-Si, IPS |
| Module Construction | COG+FPC+B/L |
| Color Depth | 16.7M Colors |
| Viewing Direction | IPS (All Views) |
| Input Data Interface | MIPI DSI (4 Lanes) |
| Driver IC | FL7703N |
| Module Size (H×V×D) | 74.83 × 78.98 × 2.07 mm |
| Active Area (H×V) | 71.93 × 71.93 mm |
| Display Mode | Transmissive, IPS |
| Operating Temperature | -20°C to +70°C |
| Storage Temperature | -30°C to +80°C |
3.2 Electrical Characteristics
3.2.1 Recommended Operating Conditions
| Parameter | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| I/O Supply voltage | IOVCC | 1.65 | 1.8 | 3.3 | V |
| Supply voltage | VCI | 2.5 | 2.75 | 3.3 | V |
3.2.2 Backlight LED Characteristics
The backlight circuit is configured as 6-Series 2-Parallel (6串2并). The total drive current is 40mA at a forward voltage of 18V (Typ.).
| Parameter | Symbol | Typ | Unit |
|---|---|---|---|
| Forward Voltage (Total) | Vf | 18 | V |
| Forward Current | If | 40 | mA |
3.3 Interface Pin Assignment (24-Pin FPC)
Connector: 24-pin FPC. The module uses a MIPI DSI interface for command/control and pixel data.
| 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, 23 | NC | -- | No connection |
| 6, 9, 12, 15, 18, 21, 22, 24 | GND | P | Ground |
| 7 | D0N | I/O | MIPI DSI Data Lane 0 Negative signal |
| 8 | D0P | I/O | MIPI DSI Data Lane 0 Positive signal |
| 10 | D1N | I | MIPI DSI Data Lane 1 Negative signal |
| 11 | D1P | I | MIPI DSI Data Lane 1 Positive signal |
| 13 | CLKN | I | MIPI DSI Clock Lane Negative signal |
| 14 | CLKP | I | MIPI DSI Clock Lane Positive signal |
| 16 | D2N | I | MIPI DSI Data Lane 2 Negative signal |
| 17 | D2P | I | MIPI DSI Data Lane 2 Positive signal |
| 19 | D3N | I | MIPI DSI Data Lane 3 Negative signal |
| 20 | D3P | I | MIPI DSI Data Lane 3 Positive signal |
Note: The pin description shows 4 data lanes (D0-D3) plus 1 clock lane (CLK), which corresponds to a 4-Lane MIPI DSI interface.
3.4 Timing Characteristics
3.4.1 Reset Input Timing
| Symbol | Parameter | Min. | Unit |
|---|---|---|---|
| tRESW | Reset low pulse width | 10 | μs |
| tREST | Reset complete time (during SLPIN mode) | 15 | ms |
| Reset complete time (during SLPOUT mode) | 120 | ms |
3.5 Electro-Optical Characteristics (Ta=25°C)
| Item | Symbol | Condition | Min. | Typ. | Max. | Unit | Remark |
|---|---|---|---|---|---|---|---|
| Response time | Tr + Tf | θx = θy=0 | -- | 30 | 40 | ms | Note 1 |
| Contrast Ratio | CR | θx = θy=0 | 900 | 1200 | -- | -- | Note 2 |
| Transmittance | T% | θx = θy=0 | 4.2 | 4.8 | -- | % | |
| Color Chromaticity (CIE1931) White | Wx, Wy | θx = θy=0 | -- | (0.294, 0.323) | -- | -- | |
| Viewing angle (All directions) | θT, θB, θL, θR | CR > 10 | 80 | 85 | -- | Deg. | Note 3 |
| Luminance (IF = 40mA) | L | -- | -- | 500 | -- | cd/m² | Note 4 |
3.6 Design Notes
- B/L Driver: The backlight driving condition is IF=40mA, Vf=18V (Typ.) (6S2P configuration).
- Mechanical: Tolerance of segments to edge of glass: ±0.2mm. TP edge should not contact metal conductors.
- Housing: It is recommended that the housing visual area be at least 0.3mm smaller than the VA (Viewing Area) on each side. The housing foam window should be at least 0.6mm larger than the VA on each side.
- RoHS: RoHS compliance.
4. Application Guidelines & Critical Notes
- Power Supply: The module requires a 2.75V (Typ.) power supply for VCI and 1.8V (Typ.) for IOVCC. Ensure the power supply ripple is minimized.
- Interface: This module uses a 4-Lane MIPI DSI interface for both command/control and pixel data. The host processor must have a MIPI DSI controller capable of driving this interface.
- Backlight Driver (External): An external constant current driver is required to supply a typical current of 40mA at a forward voltage of 18V. The circuit is configured as 6 LEDs in series and 2 in parallel (6S2P).
- Handling Precautions: Handle the module with care to avoid damage to the glass or FPC. Ground yourself to prevent electrostatic discharge (ESD).
5. Conclusion & Design-In Support
The LS0395I15-MP-V1 from Lesson Smart Display Technology is a 3.95-inch TFT-LCD module with an IPS panel and a square 720×720 resolution. It is a compact, high-resolution solution suitable for a variety of embedded display applications requiring wide viewing angles and good color performance.
For successful design-in, engineers should:
- Obtain and review the complete, official Product Specification (Revision 1.0) for the full mechanical drawing, the FL7703N driver IC datasheet for detailed command initialization, and confirmation of the backlight circuit configuration.
- Design a clean 2.75V/1.8V power supply and a backlight constant current driver circuit capable of delivering 40mA at 18V.
- 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.
