Product Main Title:
LSC0397I09-MP-V1: 3.97-Inch TFT LCD Module with Capacitive Touch, 480x800 Resolution, 16.7M Colors, MIPI DSI Interface, for Mobile and Embedded Applications
Product Subtitle / Keywords:
3.97 Inch Display, WVGA 480x800 Resolution, Transmissive a-Si TFT, MIPI DSI Interface, Integrated Capacitive Touch Panel (CTP), COG+FPC+B/L+CTP, 16.7M Colors, 400 cd/m² Luminance, -20°C to +70°C Operation, Detailed MIPI & Touch Interface Pinout
Comprehensive Technical Specification & Application Guide
1. Executive Summary & Product Positioning
The LSC0397I09-MP-V1, developed by LESSON (Wan'an) Zhixian Technology Co., Ltd., is a fully integrated 3.97-inch transmissive amorphous Silicon TFT-LCD module with a built-in capacitive touch panel (CTP). This product specification serves as the definitive technical and quality contract, meticulously defining its structural composition (COG+FPC+B/L+CTP), mechanical dimensions, display parameters, detailed MIPI DSI and I²C touch interface definitions, electrical and optical performance, and inspection standards per GB/T 2828-2003. It delivers a WVGA resolution of 480(RGB)×800 with 16.7 million color capability and a typical luminance of 400 cd/m². The document culminates in clear visual and electrical defect criteria for production and acceptance. The unequivocal recommendation for manufacturers, quality inspectors, and customers is to strictly reference this specification during design selection, production testing, and acceptance to ensure product consistency and reliability.
2. Detailed Product Overview & Architecture
- Core Technology: Transmissive-type a-Si TFT-LCD.
- 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) + CTP (Capacitive Touch Panel). A fully integrated display and touch solution.
- Primary Display Interface: MIPI DSI (Display Serial Interface) high-speed differential interface.
- Touch Interface: I²C serial interface for the integrated capacitive touch panel (CTP_SCL, CTP_SDA, CTP_INT, TP_RST).
3. Exhaustive Technical Specifications
3.1 Mechanical & Physical Specifications
- Panel Size (Diagonal): 3.97 inches
- Module Size (H×V×D): 70.3 mm × 145.4 mm × 3.63 mm
- Active Area (H×V): 51.84 mm × 86.4 mm
- Resolution: 480 (RGB) × 800 pixels
- Display Mode: Transmissive a-Si TFT-LCD
3.2 Optical & Electro-Optical Characteristics (Typical, Ta=25°C)
- Luminance (L): 350 cd/m² (Min), 400 cd/m² (Typ) @ Backlight Forward Current (I_F) = 40mA.
- Contrast Ratio (CR): 550 (Min), 800 (Typ) @ center (θx=θy=0°).
- Response Time (Tr+Tf): 35 ms (Typical).
- Transmittance (T%): 3.34% (Min), 3.93% (Typ).
- Color Chromaticity (White): W x ≈ 0.292, W y ≈ 0.333 (Typical).
- Viewing Angle (CR>10): 85° (Typical) for all directions (Top, Bottom, Left, Right).
3.3 Electrical & Interface Specifications
3.3.1 Absolute Maximum Ratings & Electrical Characteristics
Electrical Characteristics (DC):
| Item | Symbol | Min | Typ | Max | Unit | Remark |
|---|---|---|---|---|---|---|
| Supply Voltage (Main) | VCC | 2.5 | 2.8 | 3.6 | V | Note1 |
| Supply Voltage (I/O) | IOVCC | 1.65 | 1.8 | 3.3 | V | Note1 |
| Input Voltage (L) | VIL | VSS | -- | 0.3*IOVCC | V | Note1 |
| Input Voltage (H) | VIH | 0.7*IOVCC | -- | IOVCC | V | Note1 |
| LCD Drive Power Current | ILCD | -- | TBD | -- | mA |
3.3.2 Pin Description (24-pin FPC)
The module integrates display, touch, and backlight connections on one FPC.
| PIN NO. | Symbol | I/O | Description |
|---|---|---|---|
| 1, 2 | D1N, D1P | I | MIPI DSI differential data pair 1 |
| 3, 4, 7, 8, 11, 15, 16, 24 | GND | P | Ground |
| 5, 6 | D0N, D0P | I/O | MIPI DSI differential data pair 0 |
| 9, 10 | CLKN, CLKP | I | MIPI DSI differential clock pair |
| 12 | TP_RST | I | Touch Panel Reset signal |
| 13 | NC | Not Connected | |
| 14 | RESET | I | External LCD reset input |
| 17 | IOVCC | P | I/O Power supply (1.8V Typ) |
| 18 | VCI | P | Power supply |
| 19 | CTP_SCL | I | Touch Panel I²C Serial Clock |
| 20 | CTP_SDA | I/O | Touch Panel I²C Serial Data |
| 21 | CTP_INT | I | Touch Panel Interrupt signal |
| 22 | LEDK | P | Power for LED backlight cathode |
| 23 | LEDA | P | Power for LED backlight anode |
3.3.3 Critical Interface Timing
- Reset Timing: Reset pulse duration (
TRW) ≥ 10 µs. Reset cancel time (TRT) has two conditions: ≤5 ms (Note 1,5) and ≤120 ms (Note 1,6,7). - MIPI DSI Timing: The specification includes timing diagrams and parameters for High-Speed Mode and Low-Power Mode, though specific numerical values for UI (Unit Interval) are derived from the clock frequency.
3.3.4 Backlight Unit
- Circuit: Requires an external constant-current driver.
- Drive Condition: Forward Current (I_F) = 40mA (Typical), Forward Voltage (V_f) = 15V (Typical).
4. Quality Assurance & Inspection
4.1 Inspection Standards
- Sampling Plan: According to GB/T 2828-2003, normal inspection, General Inspection Level II.
- Acceptable Quality Limits (AQL): Defined for Major and Minor defects.
4.2 Defect Criteria (Examples)
- Electrical Defects (Major): No display, missing lines, segment com light/dark, flicker, Mura (tested with ND 2% filter), over current, voltage out of spec, pattern blur/error code, dark light.
- Appearance Defects (View Area):
- Minor: Fiber/scratch (W≤0.1mm, L≤3.0mm: allow 1; L>3.0mm: reject), bubble/concave (ψ≤0.2mm: disregard).
- Major: Polarizer prick (0.1mm<W≤0.25mm: disregard; >0.25mm: reject).
- Tape & Assembly Defects: FPC/H-S black tape shift exposing glue or IC (Reject), missing black tape (Reject), wrong tape position (Reject).
5. Application Guidelines & Critical Notes
- Intended Use: Smart home devices, portable medical equipment, industrial handheld terminals, consumer electronics—any application requiring a compact, integrated display and touch solution with a modern MIPI interface.
- Critical Design Considerations:
- Dual Power Domains: Provide stable 2.8V (VCC) and 1.8V (IOVCC) supplies. Ensure IOVCC logic level compatibility with the host's MIPI D-PHY and I²C interfaces.
- MIPI DSI Host: The host processor must include a MIPI DSI transmitter compatible with the module's 2-lane data (D0, D1) configuration.
- Touch Controller Integration: The host must have an I²C master to communicate with the internal touch controller and handle the interrupt signal (CTP_INT).
- Reset Sequencing: Implement proper reset control for both the LCD (RESET) and Touch Panel (TP_RST). Adhere to the specified pulse widths.
- Backlight Driver: Design a constant-current driver capable of providing 40mA at approximately 15V for the LED backlight.
- ESD & Signal Integrity: Pay attention to PCB layout for the MIPI differential pairs (impedance control, length matching) and implement system-level ESD protection.
6. Conclusion & Design-In Support
The LSC0397I09-MP-V1 specification provides a complete blueprint for integrating a modern, touch-enabled 3.97-inch display. Its key strengths are the high level of integration (display+touch on one FPC) and the use of the industry-standard MIPI DSI interface. The inclusion of detailed AQL inspection criteria is invaluable for quality control. Successful implementation requires careful attention to dual-voltage power supply design, MIPI DSI signal integrity, and proper initialization/reset of both the display and touch subsystems. By strictly following this specification, designers can efficiently incorporate a reliable and high-performance human-machine interface into their products.
