LSC028T01-S-V3: 2.8-Inch TFT LCD Module, 240×320 Resolution, SPI 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 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 280 cd/m² (Typ.), Contrast Ratio 500 (Typ.), Response Time 16 ms (Typ.), Chromaticity X=0.28±0.03, Y=0.29±0.03, Viewing Direction 12 O'clock, Backlight 4 Series WHITE LEDS, 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 LSC028T01-S-V3, 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, notes on general tolerance, operating/storage temperature, backlight circuit, chromaticity, and luminance), 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. 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 an SPI (Serial Peripheral Interface) for data and command communication. The interface signals include SDA (data), SCL (clock), RS (data/command), CS (chip select), RESET (reset).
- 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_3.3V) are provided in the pin description.
- Driver IC: ST7789V
- 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 | LSC028T01-S-V3 | - |
| 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 (26-Pin Main Interface, 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 |
|---|---|---|---|
| 1, 7-14, 23 | GND | P | Ground |
| 2 | TP_INT | I | Interrupt signal for Touch Panel |
| 3 | TP_RESET | I | Reset signal pin for Touch Panel |
| 4 | TP_SDA | I/O | Serial data input/output bidirection pin |
| 5 | TP_SCL | I | Serial clock pin for Touch Panel |
| 6 | TP_3.3V | P | Power supply for Touch Panel |
| 15, 16 | LEDA | P | Power for LED backlight anode |
| 18 | SDA | I/O | Serial data input/output PIN (SPI Data) |
| 19 | IOVCC | P | Power supply for I/O System |
| 20, 21 | VCC | P | Power supply for Core/Logic |
| 22 | CS | I | Chip select pin (SPI CS) |
| 24 | RS | I | Command and Data select pin (SPI DC) |
| 25 | SCL | I | Serial clock pin (SPI Clock) |
| 26 | RESET | I | Reset pin (Active Low) |
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 | 0.25 | 0.28 | 0.31 | --- |
| Color Chromaticity (White) | W y | θx = θy =0 | 0.26 | 0.29 | 0.32 | --- |
| 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. |
| Luminance | L | - | 260 | 280 | --- | cd/m² |
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 240×320 resolution display with an SPI 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.
- SPI Interface (4-Line Serial): The module uses a standard 4-line SPI interface. The signals are SDA (Data), SCL (Clock), RS (Data/Command), and CS (Chip Select). The write cycle is very fast (min 16ns).
- 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 the V2 version which uses parallel LEDs with a lower voltage but higher current (80mA).
- 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_3.3V).
- 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.
- Reset Sequence: The RESET pin (Pin 26) is an active-low reset signal. The module must be properly reset after power-up.
- 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. Note the important mechanical tolerance: LCD warp is ≤ 0.2mm.
- 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 LSC028T01-S-V3 specification details a compact 2.8-inch QVGA (240×320) TN TFT LCD module with a transmissive display, an SPI interface, and an integrated capacitive touch panel — a practical choice for embedded applications requiring a standard, well-characterized display solution.
Key Strengths
- Standard SPI Interface: Easy to interface with most microcontrollers.
- 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 280 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_3.3V for Touch) with proper decoupling, implementing a constant-current LED backlight driver (20mA at 12V), configuring the host processor's SPI interface (SDA, SCL, RS, CS) with the correct timing (write cycle min 16ns), 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 simple SPI interface and higher backlight voltage.
