LSC0397I07-R-V1: 3.97-Inch TFT LCD Module, 480×800 Resolution, RGB Interface, IPS Display
Product Subtitle / Keywords
3.97 Inch Display, 480(RGB)×800 Resolution, a-Si TFT-LCD Module, Transmissive, IPS Display, 16.7M Display Colors, COG+FPC+B/L+CTP Module Type, 18BIT RGB Interface, Driver IC ST7701SN, Operating Temperature -20°C to +70°C, Storage Temperature -30°C to +80°C, Supply Voltage VCC=2.8V (Typ), IOVCC=1.8V (Typ), Backlight IF=40mA, Viewing Direction Free (IPS), Module Size 59.4 × 108.32 × 3.675 mm, Active Area 51.84 × 86.4 mm, Contrast Ratio 800 (Typ), Luminance 450 cd/m² (Typ), RoHS Compliant, Spec Revision 1.0, Lesson Smart Display Technology Co., Ltd., Inspection Standards GB/T 2828-2003, AQL Major 0.65 Minor 1.5.
1. Executive Summary & Product Positioning
The LSC0397I07-R-V1, developed by Lesson Smart Display Technology Co., Ltd. (立信(万安)智显科技有限公司), is a transmissive type a-Si TFT-LCD (amorphous silicon thin film transistor liquid crystal display) module, which is composed of a TFT-LCD panel, a driver circuit and a backlight unit. The panel size is 3.97 inch and the resolution is 480(RGB)*800, the panel can display up to 16.7 M colors. The module type is COG+FPC+B/L+CTP.
This product specification (Revision 1.0) serves as the definitive technical document, defining the module's general description, physical features (including display mode, viewing direction, and driver IC), mechanical specification (module size and active area), outline dimension (including detailed mechanical drawings and notes on CTP, backlight, operating/storage temperature, and driver IC), absolute maximum ratings (for supply voltage and temperature), electrical characteristics (VCC, IOVCC, and input voltage levels), module function description (including block diagram, pin description, and timing characteristics for serial and RGB interfaces), electro-optical characteristics (response time, contrast ratio, transmittance, color chromaticity, viewing angle, and luminance), inspection standards (including AQL, glass defect, LCD appearance defect, FPC defect, and electrical criteria), and records of versions.
The document provides the core parameters necessary for system integration into standard 3.97-inch portrait display applications. The unequivocal recommendation for engineers is to strictly adhere to the mechanical and electrical specifications described herein to ensure reliable performance and compatibility.
2. Detailed Product Overview & Architecture
- Core Technology: Transmissive type a-Si TFT-LCD (amorphous silicon thin film transistor liquid crystal display) module, which is composed of a TFT-LCD panel, a driver circuit and a backlight unit.
- Display Resolution: Standard portrait format: 480(RGB) × 800 pixel array.
- Display Mode: IPS (In-Plane Switching) with \\\"Free\\\" viewing direction (Grayscale Inversion). Active matrix TFT, Transmissive type.
- Module Construction: COG (Chip-On-Glass) + FPC (Flexible Printed Circuit) + B/L (Backlight) + CTP (Capacitive Touch Panel).
- Interface Type: The module uses an 18BIT RGB interface for pixel data transfer. It also features a SPI interface (3-line serial) for command/configuration and a separate set of pins for the Capacitive Touch Panel (I²C).
- Power Architecture: The module's driver IC ST7701SN supports dual power supplies: VCC (2.5V to 3.6V, Typ 2.8V) for the analog and digital core, and IOVCC (1.65V to 3.3V, Typ 1.8V) for the I/O interface.
- Backlight: A white LED backlight configured as 5 series and 2 parallel strings. The driving condition is specified as IF=40mA (constant current) and a forward voltage range of Vf=14V to 16V (Typ 15V).
- Touch Panel: The module includes a Capacitive Touch Panel (CTP) with its own dedicated interface pins: TP_2.8V (power), TP_INT (interrupt), TP_SCL (I²C clock), TP_SDA (I²C data), and TP_RST (reset). The touch controller operates at 2.8V.
- Driver IC: The module is driven by the ST7701SN IC.
- Supplier: 立信(万安)智显科技有限公司 (Lesson Smart Display Technology Co., Ltd).
3. Exhaustive Technical Specifications
3.1 Mechanical & Physical Specifications
| Item | Specification | Unit |
|---|---|---|
| Model | LSC0397I07-R-V1 | - |
| Display Size (Diagonal) | 3.97 | inch |
| Resolution | 480(RGB) × 800 | pixels |
| Display Type / Mode | Transmissive a-Si TFT-LCD, Active matrix TFT, IPS | - |
| Module Type | COG+FPC+B/L+CTP | - |
| Display Colors | 16.7M | colors |
| Viewing Direction | Free (IPS) | - |
| Driver IC | ST7701SN | - |
| Input Data | 18BIT RGB | - |
| Module Size (H×V×D) | 59.4 × 108.32 × 3.675 | mm |
| Active Area (H×V) | 51.84 × 86.4 | mm |
| Supplier | 立信(万安)智显科技有限公司 (Lesson Smart Display Technology Co., Ltd) | - |
3.2 Interface & Electrical Specifications
3.2.1 Absolute Maximum Ratings (From Section 5)
| Item | Symbol | Min | Max | Unit |
|---|---|---|---|---|
| Supply voltage | VCC | -0.3 | 3.6 | V |
| Supply voltage | IOVCC | -0.3 | 3.6 | V |
| Operating temperature | TOPR | -20 | 70 | °C |
| Storage temperature | TSTR | -30 | 80 | °C |
3.2.2 Recommended Operating Conditions (From Section 6)
| Item | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Supply voltage | VCC | 2.5 | 2.8 | 3.6 | V |
| Supply voltage | IOVCC | 1.65 | 1.8 | 3.3 | V |
| Input Voltage L level | VIL | VSS | - | 0.3*IOVCC | V |
| Input Voltage H level | VIH | 0.7*IOVCC | - | IOVCC | V |
| Backlight Forward Current | IF | - | 40 | - | mA |
| Backlight Forward Voltage | Vf | 14 | 15 | 16 | V |
3.2.3 Pin Description (Partial, From Section 7-2)
The module uses a 40-pin FPC connector which integrates the LCM interface, backlight, and CTP signals. Key pins include:
| PIN NO. | Symbol | I/O | Description |
|---|---|---|---|
| 1 | LEDK | P | Power for LED backlight cathode |
| 2 | LEDA | P | Power for LED backlight anode |
| 4 | VDD | P | Power Supply |
| 5-22 | D0-D17 | I | Parallel data bus for RGB Interface |
| 24 | TP_2.8V | P | Power Supply for Touch Panel |
| 25 | TP_INT | O | Touch panel interrupt signal |
| 26 | TP_SCL | I/O | Serial clock pin for Touch Panel |
| 27 | TP_SDA | I/O | Serial data input/output bidirection pin for Touch Panel |
| 30 | DCLK | I | Dot clock signal for RGB interface operation |
| 32 | HS | I | Line synchronizing signal for RGB interface operation |
| 33 | VS | I | Frame synchronizing signal for RGB interface operation |
| 37-39 | SPI_SDA, SCL, CS | I/O | SPI interface for command/register configuration |
| 40 | RESET | I | External reset input (active low) |
3.3 Timing Characteristics (From Section 7.3)
3.3.1 Serial Interface Characteristics (3-line serial, From Table 4)
| Signal | Parameter | Min | Unit |
|---|---|---|---|
| SCL | Serial clock cycle (Write) | 66 | ns |
| SCL | \\\"H\\\" pulse width (Write) | 15 | ns |
| SCL | \\\"L\\\" pulse width (Write) | 15 | ns |
| SDA (DIN) | Data setup time | 10 | ns |
| SDA (DIN) | Data hold time | 10 | ns |
3.3.2 RGB Interface Characteristics (From Figure 3 and related table)
| Signal | Parameter | Min | Unit |
|---|---|---|---|
| DOTCLK | Cycle Time | 33 | ns |
| DOTCLK | High-level Pulse Width | 15 | ns |
| DOTCLK | Low-level Pulse Width | 15 | ns |
| DB | Data Setup Time | 5 | ns |
| DB | Data Hold Time | 5 | ns |
3.4 Electro-Optical Characteristics (From Section 8)
| Item | Condition | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|
| Response time (Tr+Tf) | θx = θy=0° | - | 35 | - | ms |
| Contrast Ratio (CR) | θx = θy=0° | 550 | 800 | - | - |
| Luminance (IF=40mA) | θx = θy=0° | 400 | 450 | - | cd/m² |
| Viewing angle (CR > 10) | θT, θB, θL, θR | - | 85 | - | Deg. |
| Transmittance | θx = θy=0° | 3.34 | 3.93 | - | % |
| Color Chromaticity (White) | Wx | - | 0.292 | - | - |
| Color Chromaticity (White) | Wy | - | 0.333 | - | - |
4. Application Guidelines & Critical Notes
Intended Use
- Standard 3.97-inch portrait display applications (e.g., handheld devices, portable instruments, medical equipment, POS terminals).
- Systems requiring a full-featured RGB interface with a dedicated SPI bus for configuration.
- Applications requiring a built-in capacitive touch panel (CTP) with an I²C interface.
Critical Design Considerations
- Dual-Voltage Power Supply (VCC & IOVCC): The module requires two separate power domains: VCC (Typ. 2.8V) for the internal core logic and IOVCC (Typ. 1.8V) for the I/O interface. Both must be stable and within their specified ranges.
- RGB + SPI Interface: The display pixel data is driven via a parallel 18-bit RGB interface (pins D0-D17, DCLK, HS, VS, DE). Configuration commands are sent via a separate 3-wire SPI interface (pins SPI_CS, SPI_SCL, SPI_SDA). The host must support both interfaces simultaneously.
- Backlight Driving (40mA at ~15V): The backlight is configured as 5 series and 2 parallel white LEDs. A constant current driver capable of delivering 40mA at a forward voltage of ~15V is required.
- Capacitive Touch Panel (I²C at 2.8V): The touch controller operates on a 2.8V supply and communicates via an I²C bus (TP_SCL, TP_SDA) with an interrupt signal (TP_INT). Firmware must initialize and manage this controller.
- High-Speed RGB Timing: The DOTCLK cycle time is 33ns (minimum), corresponding to a maximum clock frequency of about 30 MHz. PCB layout for the parallel RGB bus should ensure signal integrity.
- Temperature Range (-20°C to +70°C Operating): A standard industrial temperature range.
Handling & Compliance
- Observe standard ESD precautions during handling and assembly.
- The module contains fragile glass – handle with care. Avoid mechanical stress on the active area or FPC.
- Do not attempt to disassemble or modify the LCD module.
- The module is RoHS compliant.
- Inspection standards follow GB/T 2828-2003, with AQL of 0.65 for major defects and 1.5 for minor defects.
5. Conclusion & Design-In Support
The LSC0397I07-R-V1 specification details a full-featured 3.97-inch (480×800) IPS TFT LCD module with an 18-bit RGB interface, SPI for command, and an integrated capacitive touch panel — a complete and versatile display solution for a wide range of embedded applications.
Key Strengths
- Complete Display Solution: Integrates the TFT panel, touch screen, and backlight into a single module (COG+FPC+B/L+CTP), simplifying system design.
- Standard RGB Interface: Compatible with many microcontrollers and application processors that have a built-in parallel RGB controller.
- Dedicated SPI for Configuration: Offers a separate control path for initializing the ST7701SN driver IC.
- Full-Viewing-Angle IPS Display: Provides excellent image quality from any direction.
- Detailed Technical Documentation: Comprehensive specs facilitate rapid integration.
Main Design Focus
- The critical design tasks are implementing a constant-current LED backlight driver (40mA at ~15V), interfacing the host processor's RGB controller with the parallel data bus (D0-D17, DCLK, HS, VS, DE) while managing the SPI bus for configuration, providing stable dual power supplies (VCC 2.8V, IOVCC 1.8V), and initializing and communicating with the touch controller over I²C (TP_SDA, TP_SCL, TP_INT, TP_RST).
- Supporting requirements: Connect all ground pins. Ensure the RESET pin is driven low for a proper initialization sequence as per the timing specifications in the datasheet.
This module is an excellent choice for engineers designing cost-effective and reliable embedded systems that require a standard resolution, touch-enabled IPS display with a well-known RGB interface.
