LS0397I10-R-V1 3.97 inch TFT-LCD Module 480x800 16.7M Colors IPS
Product Keywords: 3.97″ LCD Module, COG+FPC+B/L, 480(RGB)×800 Resolution, 16.7M Colors, Transmissive a-Si TFT-LCD, IPS, RGB Interface, 4 Chip-White LED (40mA), -20°C to +70°C Operation.
1. Executive Summary & Product Positioning
The LS0397I10-R-V1 is a 3.97-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 3.97 inch and the resolution is 480(RGB)*800, the panel can display up to 16.7M colors.
Product Positioning: This module features a 3.97-inch IPS (In-Plane Switching) panel, offering superior viewing angles (IPS) and high color performance (16.7M colors). With a standard RGB interface, it is well-suited for a wide range of applications such as industrial HMI, medical equipment, and other embedded display systems requiring a reliable and high-resolution display.
2. Detailed Product Overview & Architecture
The module's architecture is designed for robust performance and easy integration. The primary components include:
- TFT-LCD Panel: 3.97-inch diagonal, a-Si TFT active matrix, transmissive, IPS mode (Normally Black). Resolution is 480(RGB) × 800 pixels. Active area is 51.84 (H) × 86.4 (V) mm.
- Driver Circuit: The module integrates a Driver IC (ST7701SN), communicating via an RGB Interface.
- Backlight Unit (B/L): A white LED backlight with LEDs configured in a 4S2P arrangement (4 series, 2 parallel). The typical driving condition is IF=40mA, Vf=12V (TYP).
- Mechanical Construction: COG (Chip-on-Glass) + FPC (with PI reinforcement, total thickness ~0.3mm) + B/L. The total module thickness is 2.12±0.2 mm.
- Interface: The module communicates via a 40-pin FPC connector. The display interface is RGB Interface.
- Display Mode: Active matrix TFT, Transmissive type, IPS.
3. Exhaustive Technical Specifications
3.1 General & Mechanical Specifications
| Item | Specification |
| Display Size (Diagonal) | 3.97 inches |
| Resolution (Dots) | 480(RGB) × 800 |
| Display Technology | Active Matrix TFT, Transmissive, a-Si, IPS |
| Module Construction | COG+FPC+B/L |
| Color Depth | 16.7M Colors |
| Display Technology | Transmissive, IPS |
| Input Data Interface | RGB Interface |
| Driver IC | ST7701SN |
| Module Size (H×V×D) | 55.55 × 96.17 × 2.12 mm |
| Active Area (AA, H×V) | 51.84 × 86.4 mm |
| Pixel Arrangement | RGB Dot-matrix (480(RGB)×800) |
| Display Mode | Active matrix TFT, Transmissive type |
| Backlight Type | White LED, 4S2P (4 series, 2 parallel) |
| Operating Temperature | -20°C to +70°C |
| Storage Temperature | -30°C to +80°C |
3.2 Absolute Maximum Ratings
Stress beyond those listed may cause permanent damage.
| Item | Symbol | Min | Max | Unit | Remark |
|---|---|---|---|---|---|
| Supply voltage | VCC | -0.3 | 3.6 | V | Note1 Note2 |
| Supply voltage | IOVCC | -0.3 | 3.6 | V | Note1 Note2 |
| Operating temperature | TOPR | -20 | 70 | °C | Note1 Note2 |
| Storage temperature | TSTR | -30 | 80 | °C | Note1 Note2 |
3.3 Electrical Characteristics
3.3.1 Backlight LED Characteristics
The backlight consists of White LEDs in a 4S2P configuration. The backlight drive condition is IF=40mA, Vf=12V (TYP).
| Parameter | Symbol | Typ | Unit |
|---|---|---|---|
| Forward Voltage | Vf | 12 | V |
| Forward Current (Total) | IF | 40 | mA |
3.4 Interface Pin Assignment (40-Pin FPC)
The module communicates via a 40-pin FPC connector. The interface is RGB.
| PIN NO. | Symbol | I/O | Description |
|---|---|---|---|
| 1 | LEDK | P | Power for LED backlight cathode |
| 2 | LEDA | P | Power for LED backlight anode |
| 3 | GND | P | Ground |
| 4 | VCC | P | power supply |
| 5-12 | R0-R7 | I | Data bus for RGB Interface (Red) |
| 13-20 | G0-G7 | I | Data bus for RGB Interface (Green) |
| 21-28 | B0-B7 | I | Data bus for RGB Interface (Blue) |
| 29 | GND | P | Ground |
| 30 | CLK | I | Dot clock signal for RGB interface operation |
| 31 | NC | -- | No Connection |
| 32 | HS | I | Line synchronizing signal for RGB interface operation |
| 33 | VS | I | Frame synchronizing signal for RGB interface operation |
| 34 | DE | I | Data enable signal for RGB interface operation |
| 35 | NC | -- | No Connection |
| 36 | GND | P | Ground |
| 37 | RST | I | The external reset input |
| 38 | CS | I | chip select signal |
| 39 | SCL | I | Serial clock input for SPI interface |
| 40 | SDA | I | Serial data input/output bidirectional pin for SPI Interface |
3.5 Timing Characteristics
3.5.1 Reset Timing
Condition: VDDI=1.8V, VDD=2.8V, AGND=DGND=0V, Ta=25°C.
| Related Pins | Symbol | Parameter | MIN | MAX | Unit |
|---|---|---|---|---|---|
| RESX | TRW | Reset pulse duration | 10 | - | us |
| RESX | TRT | Reset cancel | - | 5 | ms |
| RESX | TRT | Reset cancel | - | 120 | ms |
3.6 Inspection Standards
Key visual and electrical inspection criteria for the module.
3.6.1 Glass Defect
- Dimension Unconformity (Major defect): Must conform to Engineering Drawing.
- Cracks (Major defect): Linear cracks on panel: Reject.
- Glass extrude the conductive area (Minor defect): Bonding area ≤ 0.5mm: Accept.
- Pin-side, conductive area damaged (Minor defect): b ≤ 1/3 of effective length for bonding electrode: Accept.
3.6.2 LCD Appearance Defect (View area)
- Fiber, glass scratch, polarizer scratch/folded (Minor defect): Specific defect criteria with allowable quantities based on width and length.
3.6.3 FPC
- Copper screen peel (Major defect): Reject.
- No release tape or peel (Major defect): Reject.
- Dirty dot and impurity (Minor defect): ψ≤0.25mm: 2 allowed.
3.6.4 Electrical Criteria
- No display, Missing line, Seg-com light and dark, Flicker, Mura, Over current, etc. are all classified as Major defects (Reject).
3.7 Design Notes from Documentation
- B/L Driver: The backlight driving condition is IF=40mA, Vf=12V for a 4S2P LED configuration.
- Mechanical: Tolerance of segments to edge of glass: ±0.2mm. The FPC includes PI reinforcement with a total thickness of 0.3mm (FPC+PI). Yellow insulating tape is used for FPC protection.
- 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. The TP edge should not contact metal conductors to avoid ESD or short circuit risks.
- RoHS: RoHS compliance is expected.
4. Application Guidelines & Critical Notes
- Power Supply: The module requires a 2.8V (Typ.) power supply for VCC and 1.8V (Typ.) for IOVCC (as per timing conditions). Ensure the power supply ripple is minimized.
- Interface: This module uses a standard RGB (Parallel) Interface protocol. The host processor must be configured for this protocol, managing signals such as CLK, HS, VS, DE, and the 8-bit data buses (R0-R7, G0-G7, B0-B7). An SPI interface is also available for configuration via CS, SCL, and SDA pins.
- Backlight Driver (External): An external constant current driver is required to supply the backlight via the LEDA and LEDK pins. The required driving condition is 40mA total current at 12V forward voltage (for a 4S2P configuration).
- Reset: A hardware reset pin (RST, Pin 37) is provided. The reset pulse duration must be at least 10 µs. It is necessary to wait 5ms after releasing RESX before sending commands.
- Handling Precautions: Handle the module with care to avoid damage to the glass or FPC. Ground yourself to prevent electrostatic discharge (ESD).
- Ground Dots: Silver dots (银浆点) are noted in the mechanical drawing for grounding purposes (likely connected to GND).
5. Conclusion & Design-In Support
The LS0397I10-R-V1 from Lesson Smart Display Technology is a 3.97-inch IPS TFT-LCD module with an RGB interface. It is a standard-resolution, high-quality display solution suitable for a wide variety of 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 (ST7701SN) datasheet for detailed command initialization and timing parameters.
- Design a clean 2.8V power supply and a backlight constant current driver circuit capable of delivering 40mA at 12V.
- Configure the host processor's RGB and SPI interfaces 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.
