Product Subtitle / Keywords:
3.95 Inch Display, 720(RGB)×720 Resolution, Transmissive Color Active Matrix TFT, MIPI Interface, COG+FPC+B/L, 16.7M Colors, 40-Pin, FL7703NI Driver, 500 cd/m² Brightness, 1000:1 Contrast Ratio, IPS, -20°C~70°C Operating Temperature
1. Executive Summary & Product Positioning
The LS0395I14-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 3.95-inch transmissive color active matrix TFT (Thin Film Transistor) liquid crystal display (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 square resolution of 720(RGB)×720 with 16.7M-color display capability, driven by the FL7703NI controller.
The document provides the core parameters necessary for system integration into embedded display applications requiring a high-resolution square display. 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 color active matrix TFT (Thin Film Transistor) liquid crystal display (LCD) module.
- 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 720(RGB)×720 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: FL7703NI.
- 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) | 75.50 × 80.70 × 2.50 | mm |
| Active area (H×V) | 71.28 × 71.28 | mm |
| Number of dots / Resolution | 720(RGB) × 720 | pixel |
| Panel Size (Diagonal) | 3.95 | inch |
| Pixel Pitch (H×V) | 0.099 × 0.099 | mm |
Critical Mechanical Design Notes (from outline dimension drawing):
- Overall Module Thickness: 2.50 mm.
- Pixel Pitch: 0.099 mm (high density for a 3.95-inch display, resulting in a sharp image).
- Display Type: 3.95“, TFT LCD, IPS.
- Display Mode: Transmissive, Mode Positive.
- Viewing Direction: IPS.
- Driver IC: FL7703NI.
- VCC: 2.8V, IOVCC: 1.8V.
- Operating Temperature: -20°C ~ 70°C.
- Storage Temperature: -30°C ~ 80°C.
- Backlight: 4 Chip-White LED (2 Strings, 2 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 (same as many other Lesson modules).
- FPC Pin Count: 40 pins.
3.2 Electrical & Interface Specifications
3.2.1 Pin Description (40-pin FPC)
| PIN | SIGNAL | Description |
|---|---|---|
| 1 | NC | No Connection |
| 2 | NC | No Connection |
| 3 | NC | No Connection |
| 4 | NC | No Connection |
| 5 | TE | Tearing Effect output |
| 6 | NC | No Connection |
| 7 | NC | No Connection |
| 8 | NC | No Connection |
| 9 | NC | No Connection |
| 10 | GND | Ground |
| 11 | D0N | MIPI-DSI Data signal input (Data lane 0) |
| 12 | D0P | MIPI-DSI Data signal input (Data lane 0) |
| 13 | GND | Ground |
| 14 | B1N | MIPI-DSI Data signal input (Data lane 1) |
| 15 | D1P | MIPI-DSI Data signal input (Data lane 1) |
| 16 | GND | Ground |
| 17 | CLK/N | MIPI-DSI Clock signal input |
| 18 | CLKP | MIPI-DSI Clock signal input |
| 19 | GND | Ground |
| 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 2 data lanes (D0N/D0P, B1N/D1P) and 1 clock lane (CLK/N, CLKP) 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 10, 13, 16, 19, 20, 24, 30, 33, 38, 39) for ground.
- Control: RESET (Pin 27) for hardware reset, TE (Pin 5) for tearing effect.
- I2C Interface: SCL (Pin 29) and SDA (Pin 28) for register configuration.
- Unused Pins: Pins 1-4, 6-9, 21-23, 25, 26, 40 are NC — leave floating.
3.2.2 Backlight Unit
| Item | Specification | Unit |
|---|---|---|
| LED Circuit Configuration | 4 Chip-White LEDs (2 Strings, 2 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 (2 series LEDs per string × 2 strings = 40 mA total, typically 19.2V total for 2 series LEDs, although the document also lists 4 series which is contradictory — refer to the detailed mechanical drawing for the exact configuration).
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 | — | 1000 | — | — |
| 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 | 2025-08-06 | ALL | New released |
4. Application Guidelines & Critical Notes
Intended Use
- Smart home control panels (e.g., round/square smart speakers, light switches)
- Wearable devices and smartwatches
- Automotive aftermarket displays (center console, instrument cluster)
- IoT edge devices requiring high-resolution square display
Critical Design Considerations
-
Interface (MIPI with 2 Data Lanes): This module uses a MIPI-DSI interface with 2 data lanes and 1 clock lane. The host MCU must have a MIPI-DSI controller that supports at least 2 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: 75.50mm (H) × 80.70mm (V) × 2.50mm (D). This is a slightly wider module to accommodate the 720×720 square display.
- Active Area: 71.28mm × 71.28mm — a perfect square design.
- FPC: The module uses a 40-pin FPC.
-
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: 1000:1 (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 LS0395I14-MP-V1 specification details a high-resolution 3.95-inch square display module with a MIPI interface, FL7703NI driver, and IPS technology — an excellent choice for applications requiring a high-quality square display.
Key Strengths:
-
Unique Square Resolution (720×720): Ideal for smart home control panels, wearable devices, and square HMI applications.
-
High Resolution: 720×720 provides a very high pixel density (217 PPI on 71.28mm active area) for sharp and detailed images.
-
MIPI Interface: 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: 1000:1 (Typ) provides outstanding image quality.
-
IPS Technology: Provides superior, consistent image quality from any viewing angle.
-
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 2 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 75.50mm × 80.70mm × 2.50mm.
- FPC connector — verify the 40-pin FPC.
This module is an excellent choice for smart home, IoT, and any embedded application requiring a high-resolution square display with excellent image quality and wide viewing angles.
