LSC055I18-MP-V1 5.5 inch LCD Module 720x1440 16.7M Colors Panda Reflective/Transmissive
Product Keywords: 5.5″ LCD Module with CTP, COG+FPC+B/L+CTP, 720(H)×1440(V) Resolution, 16.7M Colors, Panda Display (Reflective/Transmissive), MIPI (4 Lanes) Interface, 14 Chip-White LED Series (40mA), -20°C to +70°C Operation, All Free Viewing Direction.
1. Executive Summary & Product Positioning
The LSC055I18-MP-V1 is a special 5.5-inch "Panda" type LCD module developed by 立信(万安)智显科技有限公司 (Lesson Smart Display Technology Co., Ltd). It combines Reflective and Transmissive display technologies in one module. The panel size is 5.5 inch and the resolution is 720(H)*3(RGB)*1440(V), the panel can display up to 16.7M colors. It features a Capacitive Touch Panel (CTP).
Product Positioning: This module is uniquely positioned for applications that require excellent sunlight readability and low power consumption. By using Reflective Mode (backlight off) in bright outdoor environments and switching to Transmissive Mode (backlight on) in lower light indoor environments, it optimizes both visibility and power consumption. This makes it ideal for outdoor handheld devices, industrial terminals, and portable instruments.
2. Detailed Product Overview & Architecture
The module's architecture is designed for robust performance and easy integration. The primary components include:
- TFT-LCD Panel: 5.5-inch diagonal, a-Si TFT active matrix, "Panda" type (Reflective + Transmissive), Normally Black. Resolution is 720(RGB) × 1440 pixels.
- Driver Circuit: The module integrates a Driver IC (ST7703I-G5-DP2), communicating via an MIPI (4 Lanes) Interface.
- Backlight Unit (B/L): A white LED backlight with 14 Chip-White LEDs configured in series. The typical driving condition is IF=40mA, Vf=22.4V (TYP).
- Mechanical Construction: COG (Chip-on-Glass) + FPC (with PI reinforcement) + B/L + CTP (Capacitive Touch Panel). The total module dimensions are 70.7 (W) × 141.8 (H) × 3.02 (D) mm (Typ).
- Interface: The module communicates via a 40-pin FPC connector. The display interface is MIPI-DSI (4 Data Lanes).
- Display Mode: "Panda" Display (Reflective + Transmissive), Normally Black.
- Viewing Direction (Grayscale Inversion): ALL FREE.
- RoHS: All materials are compliant with RoHS standards.
3. Exhaustive Technical Specifications
3.1 General & Mechanical Specifications
| Item | Specification |
| Display Size (Diagonal) | 5.5 inches |
| Resolution (Dots) | 720(H)×3(RGB)×1440(V) |
| Display Technology | Active Matrix TFT, Panda (Reflective + Transmissive), Normally Black |
| Module Construction | COG+FPC+B/L+CTP |
| Color Depth | 16.7M Colors |
| Viewing Direction (Grayscale Inversion) | ALL FREE |
| Input Data Interface | MIPI-DSI (4 Data Lanes) |
| Driver IC | ST7703I-G5-DP2 |
| Module Size (W×H×D) | 70.7 × 141.8 × 3.02 mm (Typ) |
| Active Area (AA, W×H) | 120.96 × 60.48 mm |
| Pixel Pitch (W×H) | 0.084 × 0.084 mm |
| Pixel Arrangement | RGB Dot-matrix (720(RGB)×1440) |
| Display Mode | Panda (Reflective + Transmissive), Normally Black |
| Backlight Type | 14 Chip-White LEDs, Series |
| Operating Temperature | -20°C to +70°C |
| Storage Temperature | -30°C to +80°C |
| Environmental Compliance | RoHS 2.0 |
3.2 Power Consumption
The module power consumption varies significantly depending on the operating mode (Reflective vs. Transmissive).
| Mode | Module Power Consumption (Typ) | Unit | Remark |
|---|---|---|---|
| Reflective Mode | 0.146 | Watt | Backlight OFF |
| Transmissive Mode | 0.986 | Watt | Backlight ON |
3.3 Electrical Characteristics
3.3.1 Backlight LED Characteristics
The backlight consists of 14 Chip-White LEDs in series. The backlight drive condition is IF=40mA, Vf=18.9V~22.4V (TYP 22.4V).
| Parameter | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Forward Voltage | Vf | 18.9 | 22.4 | 22.4 | V |
| Forward Current (Total) | IF | - | 40 | - | mA |
Note: LED life time (brightness decrease to 50%) is defined at ILED=20mA (Per Led). Operating ILED larger than 20mA may decrease life time.
3.4 Display Modes: Reflective vs. Transmissive
This module can operate in two distinct modes, each with unique optical characteristics.
| Feature | Reflective Mode | Transmissive Mode |
|---|---|---|
| Backlight Status | OFF | ON |
| Luminance Formula | 8.5% × Surrounding illumination (cd/m²) | 80 + 8.5% × Surrounding illumination (cd/m²) |
| Brightness Source | Ambient light reflection | Backlight + Ambient light reflection |
| Optimal Environment | Bright outdoor (sunlight) | Indoor, low light conditions |
| Power Consumption | Low (0.146W) | Higher (0.986W) |
3.5 Optical Specification (Transmittance Mode)
Condition: Ta=25°C, viewing angle at center point, θx=θy=0.
| Parameter | Symbol | Condition | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|---|
| Contrast Ratio | C/R | θ = 0° | -- | -- | -- | -- |
| NTSC Ratio | S | θ = 0° | -- | 18 | -- | % |
| Luminance | L | θ = 0° | -- | 100 | -- | cd/m² |
| Luminance uniformity | Uw | θ = 0° | 80 | -- | -- | % |
| Response Time | $T_{R}+T_{F}$ | 25 °C | -- | -- | 30 | ms |
| Color Coordination (White) | $W_{X}$, $W_{Y}$ | θ = 0° | -0.04 | -- | +0.04 | NTSC (x,y) |
| Viewing Angle (all directions) | θL, θR, θU, θD | C/R > 2 | -- | 60 | -- | Deg. |
3.6 Interface Pin Assignment (40-Pin FPC)
Connector: 40-pin FPC. Interface: MIPI-DSI (4 Data Lanes) + I2C (for CTP).
| PIN NO. | Symbol | I/O | Description |
|---|---|---|---|
| 1 | GND | P | Power Ground |
| 2 | D2P | I | MIPI-DSI data lane 2 positive-end input pin |
| 3 | D2N | I | MIPI-DSI data lane2 negative-end input pin |
| 4 | GND | P | Power Ground |
| 5 | D1P | I | MIPI-DSI data lane 1 positive-end input pin |
| 6 | D1N | I | MIPI-DSI data lane 1 negative-end input pin |
| 7 | GND | P | Power Ground |
| 8 | CLKP | I | MIPI-DSI data clock lane positive-end input pin |
| 9 | CLKN | I | MIPI-DSI data clock lane negative-end input pin |
| 10 | GND | P | Power Ground |
| 11 | D0P | I/O | MIPI-DSI data lane 0 positive-end input pin |
| 12 | D0N | I/O | MIPI-DSI data lane 0 negative-end input pin |
| 13 | GND | P | Power Ground |
| 14 | D3P | I | MIPI-DSI data lane 3 positive-end input pin |
| 15 | D3N | I | MIPI-DSI data lane 3 negative-end input pin |
| 16 | GND | P | Power Ground |
| 17 | ID | I | LCD ID |
| 18 | RESET | I | The signal will reset the LCM, Signal is active low. |
| 19 | TE | O | Tearing effect output signal. |
| 20 | GND | P | Power Ground |
| 21 | IOVCC 1.8 | P | Power supply for logic circuits and IO pads (1.8V) |
| 22 | GND | P | Power Ground |
| 23 | NC | - | No connected |
| 24 | AVEE | P | Negative input analog power for driver IC use |
| 25 | AVDD | P | Positive input analog power for driver IC use |
| 26 | NC | - | No connected |
| 27-28 | LEDK | P | Power supply for backlight cathode |
| 29 | LEDA | P | Power supply for backlight anode |
| 30 | NC | - | No connected |
| 31 | GND | P | Power Ground |
| 32 | TP-RST | I | The signal will reset the TP, Signal is active low |
| 33 | TP-INT | O | Interrupt signals for TP |
| 34 | GND | P | Power Ground |
| 35 | TP-SDA | I | I2C data signal for TP |
| 36 | TP-SCL | I | I2C clock signals for TP |
| 37-40 | (GND) | P | Ground (from block diagram, pins 37-40 are connected to GND) |
3.7 Timing Characteristics (MIPI DSI)
3.7.1 MIPI High Speed Mode Timing
Condition: A=0V, IOVCC=1.65V to 3.3V, VCI=2.5V to 3.3V, TA = -30 to 70°C.
| Signal | Item | Symbol | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|---|
| DSI_CP/DSI_CN | Double UI instantaneous | 2xUINST | TBD | - | 25 | ns |
| DSI_CP/DSI_CN | UI instantaneous | UINSTA UINSTB | TBD | - | 12.5 | ns |
| DP/DN | Data to clock setup time | TDS | 0.15xUI | - | - | ps |
| DP/DN | Data to clock hold time | TDH | 0.15xUI | - | - | ps |
| DSI_CP/DSI_CN | Differential rise time for clock | TDRTCLK | 150 | - | 0.3UI | ps |
| DSI_CP/DSI_CN | Differential fall time for clock | TDFTCLK | 150 | - | 0.3UI | ps |
| DP/DN | Differential rise time for data | TDRTDATA | 150 | - | 0.3UI | ps |
| DP/DN | Differential fall time for data | TDFTDATA | 150 | - | 0.3UI | ps |
3.7.2 MIPI Low Power Mode to High Speed Mode Timing
| Signal | Item | Symbol | Min. | Max. | Unit |
|---|---|---|---|---|---|
| DSI_DOP_DSI_DOP | Time-Out at Display Module to Ignore | THS-SKIP | 40 | 55+4xUI | ns |
| DSI_DOP_DSI_DOP | Time to Driver LP-11 after HS Burst | THS-EXIT | 100 | - | ns |
3.8 Design Notes from Documentation
- Backlight Mode Control: It is recommended to use Reflective Mode (Backlight OFF) when ambient illumination is above 1500 cd/m². Use Transmissive Mode (Backlight ON) when ambient illumination is below this value for optimal display effect.
- B/L Driver: The backlight driving condition is IF=40mA, Vf=18.9V~22.4V for a series LED configuration of 14 LEDs.
- Mechanical: Tolerance of segments to edge of glass: ±0.2mm. The cover glass (LENS) is made by Japan Asahi Glass, 0.95mm thickness. AG (Anti-Glare) and AF (Anti-Fingerprint) coating is applied to the cover glass surface.
- Photosensitive Hole: A photosensitive hole is provided, with black ink silkscreen printing for the IR sensor window.
- 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. TP edge should not contact metal conductors to avoid ESD or short circuit risks.
- RoHS: All materials must comply with RoHS 2.0 standards.
- Touch Controller: The touch IC model is CHSC5448.
- Power Supply: AVDD and AVEE are required for the analog power supply for the driver IC.
4. Application Guidelines & Critical Notes
- Power Supply: The module requires a 1.8V (Typ.) for IOVCC (logic) and separate analog power supplies (AVDD/AVEE). The backlight needs a high-voltage (up to 22.4V) constant current driver (40mA). The CTP requires a 2.8V supply.
- Interface: The display uses a standard 4-lane MIPI DSI interface. The touch panel uses an I2C interface. The host processor must be configured for these protocols.
- Backlight Driver (External): A boost converter (external) is required to supply the high-voltage backlight via the LEDA and LEDK pins. The required driving condition is 40mA total current at 22.4V forward voltage (Typ).
- Reset: A hardware reset pin (RESET, Pin 18) is provided. It must be applied properly to initialize the LCM.
- Operating Temp: The module operates from -20°C to +70°C. Below 0°C, the response time of the liquid crystal becomes slower.
- Storage: Storage temperature range is -30°C to +80°C. Humidity must be controlled per the specification: Temp ≤ 60°C, 90% RH MAX; Temp > 60°C, absolute humidity less than 90% RH at 60°C.
- Handling Precautions: Handle the module with care to avoid damage to the glass, FPC, or CTP. Ground yourself to prevent electrostatic discharge (ESD).
5. Conclusion & Design-In Support
The LSC055I18-MP-V1 from Lesson Smart Display Technology is a 5.5-inch "Panda" type TFT-LCD module with an integrated Capacitive Touch Panel (CTP) and a MIPI interface. It is a unique dual-mode (Reflective/Transmissive) display solution that excels in outdoor environments by providing excellent sunlight readability with low power consumption.
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 (ST7703I-G5-DP2) datasheet for detailed initialization and timing parameters.
- Design a clean 1.8V (IOVCC) power supply and the required analog supplies (AVDD/AVEE). Design a boost-converter based backlight constant current driver circuit capable of delivering 40mA at up to 22.4V.
- Configure the host processor's MIPI DSI (4-lane) and I2C interfaces to match the timing specifications detailed in the datasheets.
- Implement an ambient light sensor and control logic to seamlessly switch between Reflective Mode (backlight OFF) and Transmissive Mode (backlight ON) based on the surrounding illumination level.
- 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 optimized for a wide array of indoor and outdoor applications.
