LSC028T03-S-V1: 2.8-Inch TFT LCD Module, 240×320 Resolution, SPI/MCU Interface, Transmissive TN Display
Product Subtitle / Keywords
2.8 Inch Display, 240(RGB)×320 Resolution, a-Si TFT-LCD Module, Transmissive, TN Display, 262K Display Colors, COG+FPC+B/L+CTP Module Type, SPI/8BIT MCU Interface, Operating Temperature -20°C to +70°C, Storage Temperature -30°C to +80°C, Supply Voltage VCC=2.8V (Typ), IOVCC=1.8V (Typ), Module Luminance 350 cd/m² (Typ.), Contrast Ratio 500 (Typ.), Response Time 16 ms (Typ.), Chromaticity X=0.29±0.03, Y=0.30±0.03, Viewing Direction 12 O'clock, Backlight IF=20mA, VF=11.2-12.8V, RoHS Compliant, Spec Rev 1.0, Lesson Smart Display Technology Co., Ltd.
1. Executive Summary & Product Positioning
The LSC028T03-S-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 2.8 inch and the resolution is 240(RGB)*320, the panel can display up to 262k 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, mechanical specification (including module size, number of dots, and active area), outline dimension (including detailed mechanical drawings and notes on storage temperature, operating temperature, chromaticity, luminance, viewing direction, and backlight circuit), absolute maximum ratings (for supply voltage, operating temperature, and storage temperature), electrical characteristics (including recommended operating conditions for power supplies and logic levels), module function description (including pin description, block diagram, and timing characteristics), and electro-optical characteristics (including response time, contrast ratio, chromaticity, viewing angles, and luminance).
The document provides the core parameters necessary for system integration into standard 2.8-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. The panel can display up to 262k colors.
- Display Resolution: Portrait format: 240(RGB) × 320 pixel array.
- Display Mode: TN (Twisted Nematic), Active matrix TFT, Transmissive type. The viewing direction is 12 o'clock.
- Module Construction: COG (Chip-On-Glass) + FPC (Flexible Printed Circuit) + B/L (Backlight) + CTP (Capacitive Touch Panel).
- Interface Type: The module uses a selectable interface: SPI (4-Wire Serial Peripheral Interface) or 8-bit MCU Parallel Interface, determined by the IM1/2 pin state (IM1/2=1 for SPI 4W, IM1/2=0 for MCU 8BIT).
- Power Architecture: Requires dual power supplies: VCC (2.8V Typ for the core/logic) and IOVCC (1.8V Typ for the I/O interface).
- Backlight: 4 series WHITE LEDS. The driving condition is specified as IF=20mA, VF=11.2-12.8V.
- Touch Panel: The module includes a Capacitive Touch Panel (CTP) interface. The dedicated CTP pins (TP_INT, TP_RESET, TP_SDA, TP_SCL, TP_VCC) are provided.
- Driver IC: ST7789T3
- 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 | LSC028T03-S-V1 | - |
| Display Size (Diagonal) | 2.8 | inch |
| Resolution | 240(RGB) × 320 | pixels |
| Module size (H×V×D) | 56.7 × 77.7 × 3.79 | mm |
| Active area (H×V) | 43.2 × 57.6 | mm |
| Number of dots | 240(RGB) × 320 | pixel |
| Display Type / Mode | Transmissive a-Si TFT-LCD, Active matrix TFT, TN | - |
| Module Type | COG+FPC+B/L+CTP | - |
| Display Colors | 262K | colors |
| 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 | 4.6 | V |
| Supply voltage | IOVCC | -0.3 | 4.6 | 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 (LCD Core) | VCC | 2.4 | 2.8 | 3.3 | V |
| Supply voltage (I/O) | IOVCC | 1.65 | 1.8 | 3.3 | V |
| Input Voltage 'L' level | VIL | 0 | --- | 0.3*IOVCC | V |
| Input Voltage 'H' level | VIH | 0.7*IOVCC | --- | IOVCC | V |
3.2.3 Pin Description (Partial, From Section 7-2)
The module uses a 26-pin FPC connector which integrates the LCM and CTP interface signals.
| PIN NO. | Symbol | I/O | Description |
|---|---|---|---|
| 14-20 | D0-D6 | I | Data bus for 8-bit MCU interface |
| 21 | TP_VCC | P | Power supply for Touch Panel |
| 22 | TP_SCL | I | Serial clock pin for Touch Panel |
| 23 | TP_SDA | I/O | Serial data input/output bidirection pin |
| 24 | TP_RESET | I | Reset signal pin for Touch Panel |
| 25 | TP_INT | I | Interrupt signal for Touch Panel |
| 26 | TP_GND | P | Ground for Touch Panel |
3.3 Timing Characteristics (From Section 7.4.3)
The document provides detailed timing for the 4-line serial interface. Key parameters (measured at VDDI=1.65 to 3.3V, VDD=2.4 to 3.3V, Ta=25°C) include:
| Signal | Parameter | MIN | MAX | Unit |
|---|---|---|---|---|
| SCL | Serial clock cycle (Write) | 16 | - | ns |
| SCL | Serial clock cycle (Read) | 150 | - | ns |
| SDA (DIN) | Data setup time | 7 | - | ns |
| SDA (DIN) | Data hold time | 7 | - | ns |
3.4 Electro-Optical Characteristics (From Section 8)
| Item | Symbol | Condition | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|---|
| Response time | Tr +Tf | θx = θy =0 | --- | 16 | 32 | ms |
| Contrast Ratio | CR | θx = θy =0 | --- | 500 | --- | --- |
| Color Chromaticity (White) | W x | θx = θy =0 | 0.26 | 0.29 | 0.32 | --- |
| Color Chromaticity (White) | W y | θx = θy =0 | 0.27 | 0.30 | 0.33 | --- |
| Luminance | L | IF = 20mA | 280 | 350 | --- | cd/m² |
| Viewing angle (Top, θT) | θT | CR > 10 | --- | 50 | --- | Deg. |
| Viewing angle (Bottom, θB) | θB | CR > 10 | --- | 20 | --- | Deg. |
| Viewing angle (Left, θL) | θL | CR > 10 | --- | 45 | --- | Deg. |
| Viewing angle (Right, θR) | θR | CR > 10 | --- | 45 | --- | Deg. |
4. Application Guidelines & Critical Notes
Intended Use
- Standard 2.8-inch portrait display applications (e.g., handheld devices, medical equipment, industrial controls).
- Systems requiring a 240x320 resolution display with an SPI or 8-bit MCU interface.
- Applications requiring a built-in capacitive touch panel (CTP) with an I²C interface.
Critical Design Considerations
- Dual Power Supply (VCC=2.8V for Core, IOVCC=1.8V for I/O): The module requires a stable 2.8V supply for the core/analog circuitry and a separate 1.8V supply for the I/O interface. The logic thresholds (VIL, VIH) are referenced to IOVCC.
- Selectable Interface (SPI or 8-bit MCU): The module's interface mode is selected by the IM1/2 pin state (IM1/2=1 for SPI 4W, IM1/2=0 for MCU 8BIT). This must be configured correctly at power-up.
- External Backlight Driver (20mA @ 12V Series): The backlight consists of 4 LEDs in series, requiring a constant current driver capable of delivering 20mA at a forward voltage of 11.2-12.8V. This is a critical difference from some other models that use parallel LEDs with a lower voltage but higher current.
- I²C Capacitive Touch Panel Interface: The CTP uses an I²C interface (TP_SDA, TP_SCL) with a dedicated reset pin (TP_RESET) and an interrupt output (TP_INT). The CTP is powered by a 3.3V supply (TP_VCC).
- TN Display with Limited Viewing Angle: The display uses TN technology, which has a narrower viewing angle compared to IPS. The optimum viewing direction is 12 o'clock.
- Temperature Range (-20°C to +70°C Operating): A standard consumer/industrial temperature range.
- Mechanical Integration (Module Outline 56.7mm × 77.7mm × 3.79mm): The module has a thickness of 3.79mm.
- ESD and Handling: Standard ESD precautions must be observed during handling and assembly due to the sensitive electronic and glass components.
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.
5. Conclusion & Design-In Support
The LSC028T03-S-V1 specification details a compact 2.8-inch QVGA (240×320) TN TFT LCD module with a transmissive display, a selectable SPI/8-bit MCU interface, and an integrated capacitive touch panel — a versatile and practical choice for embedded applications requiring a standard, well-characterized display solution.
Key Strengths
- Selectable Interface (SPI or 8-bit MCU): Provides flexibility to interface with a wide range of microcontrollers without requiring additional hardware changes.
- Integrated Capacitive Touch Panel (I²C): Provides a complete touch display solution without needing an external touch controller.
- High Contrast and Brightness: Typical contrast ratio of 500 and luminance of 350 cd/m² ensure good image quality.
- Cost-Effective TN Technology: Suitable for applications where wide viewing angles are not critical.
- Detailed Technical Documentation: Comprehensive specs facilitate rapid integration.
Main Design Focus
- The critical design tasks are providing dual power supplies (VCC=2.8V, IOVCC=1.8V for LCD, TP_VCC for Touch) with proper decoupling, implementing a constant-current LED backlight driver (20mA at 12V), configuring the host processor's interface (SPI or 8-bit MCU) with the correct timing and the IM1/2 pin state, and initializing and communicating with the touch controller over I²C (TP_SDA, TP_SCL, TP_INT, TP_RESET).
- Supporting requirements: Connect all ground pins. Ensure the RESET pin is driven low for a proper initialization sequence.
This module is a reliable and practical choice for engineers designing embedded systems that require a standard QVGA touch display with a choice of a simple SPI or faster 8-bit MCU interface.
