LS028I31-M-V1 2.83 inch TFT-LCD Module 240x320 262k Colors IPS
Product Keywords: 2.83″ LCD Module, COG+FPC+B/L, 240(RGB)×320 Resolution, 262K Colors, IPS Viewing Direction (Free), ST7789P3 Driver IC, 8080 MCU 8-bit Parallel Interface, 4 Chip-White LED Parallel (80mA), 500 cd/m² Luminance, -20°C to +70°C Operation.
1. Executive Summary & Product Positioning
The LS028I31-M-V1 is a 2.83-inch transmissive type a-Si TFT-LCD (amorphous silicon thin film transistor liquid crystal display) module developed by 立信(万安)智显科技有限公司 (Lesson Smart Display Technology Co., Ltd). It is composed of a TFT-LCD panel, a driver circuit, and a backlight unit. The panel size is 2.83 inch and the resolution is 240(RGB)*320, the panel can display up to 262k colors.
Product Positioning: This module features a 2.83-inch IPS (In-Plane Switching) panel, offering superior viewing angles (Free/Grayscale Inversion Free) and a high typical contrast ratio of 1500:1. With a standard 8080 MCU 8-bit parallel interface, it is well-suited for a wide range of applications such as industrial HMI, smart home devices, 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: 2.83-inch diagonal, a-Si TFT active matrix, transmissive, IPS mode. Resolution is 240(RGB) × 320 pixels with an active area of 43.2 (H) × 57.6 (V) mm.
- Driver IC: The module uses the ST7789P3 driver IC, communicating via an 8080 MCU 8-bit Parallel Interface.
- Backlight Unit (B/L): A white LED backlight with 4 Chip-White LEDs configured in parallel. The typical driving condition is IF=80mA, Vf=3.1V (TYP).
- Mechanical Construction: COG (Chip-on-Glass) + FPC + B/L. The module outline dimensions are 50.0 (H) × 69.1 (V) × 2.3 (D) mm.
- Interface: The module communicates via a 24-pin FPC connector. The display interface is 8080 MCU 8-bit Parallel Interface.
- Display Mode: Transmissive, IPS, Normally Black.
- Viewing Direction (Grayscale Inversion): Free (IPS).
3. Exhaustive Technical Specifications
3.1 General & Mechanical Specifications
| Item | Specification |
| Display Size (Diagonal) | 2.83 inches |
| Resolution (Dots) | 240(RGB) × 320 |
| Display Technology | Active Matrix TFT, Transmissive, a-Si, IPS |
| Module Construction | COG+FPC+B/L |
| Color Depth | 262K Colors |
| Viewing Direction (Grayscale Inversion) | Free (IPS) |
| Input Data Interface | 8bit 8080 MCU Parallel |
| Driver IC | ST7789P3 |
| Module Size (H×V×D) | 50.0 × 69.1 × 2.3 mm |
| Active Area (H×V) | 43.2 × 57.6 mm |
| Pixel Arrangement | RGB Dot-matrix (240(RGB)×320) |
| Display Mode | Active matrix TFT, Transmissive type |
| Backlight Type | 4 Chip-White LED Parallel |
| Operating Temperature | -20°C to +70°C |
| Storage Temperature | -30°C to +80°C |
3.2 Absolute Maximum Ratings (Ta=25°C)
Stress beyond those listed may cause permanent damage.
| Parameter | Symbol | Min | Max | Unit | Remark |
|---|---|---|---|---|---|
| Supply voltage (VCC) | VCC | -0.3 | 4.6 | V | Note1 Note2 |
| Supply voltage (IOVCC) | IOVCC | -0.3 | 4.0 | V | Note1 Note2 |
| Operating temperature | TOPR | -20 | 70 | °C | Note1 Note2 |
| Storage temperature | TSTR | -30 | 80 | °C | Note1 Note2 |
3.3 Electrical Characteristics
3.3.1 Recommended Operating Conditions
Condition: VDDI=1.65 to 3.3V, VDD=2.4 to 3.3V, AGND=DGND=0V, Ta=25°C.
| Parameter | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Supply voltage (VCC) | VCC | 2.4 | 2.8 | 3.3 | V |
| I/O supply voltage | VDDI | 1.65 | 1.8 | 3.3 | V |
3.3.2 Backlight LED Characteristics
The backlight consists of 4 Chip-White LEDs in Parallel. The backlight drive condition is IF=80mA, Vf=3.1V (TYP).
| Parameter | Symbol | Typ | Unit |
|---|---|---|---|
| Forward Voltage | Vf | 3.1 | V |
| Forward Current | If | 80 | mA |
3.4 Interface Pin Assignment (24-Pin FPC)
Connector: 24-pin FPC. Interface: 8080 MCU 8-bit Parallel.
| PIN NO. | Symbol | I/O | Description |
|---|---|---|---|
| 1 | RESET | I | This signal will reset the device and it must be applied to properly initialize the chip |
| 2 | D7 | I | Interface data bus (bit 7) |
| 3 | D6 | I | Interface data bus (bit 6) |
| 4 | D5 | I | Interface data bus (bit 5) |
| 5 | D4 | I | Interface data bus (bit 4) |
| 6 | D3 | I | Interface data bus (bit 3) |
| 7 | D2 | I | Interface data bus (bit 2) |
| 8 | D1 | I | Interface data bus (bit 1) |
| 9 | D0 | I | Interface data bus (bit 0) |
| 10 | RS | I | Display data/command selection pin in parallel interface |
| 11 | CS | I | Chip selection pin |
| 12 | WR | I | Write enable in MCU parallel interface |
| 13 | RD | I | Read enable in 8080 MCU parallel interface |
| 14 | K | P | Power for LED backlight cathode |
| 15 | K | P | Power for LED backlight cathode |
| 16 | A | P | Power for LED backlight anode |
| 17 | A | P | Power for LED backlight anode |
| 18 | VCC | P | Power Supply |
| 19 | VCC | P | Power Supply |
| 20 | GND | P | Ground |
| 21 | GND | P | Ground |
| 22 | NC | -- | No connection |
| 23 | NC | -- | No connection |
| 24 | TE | O | Tearing effect signal is used to synchronize MCU to frame memory writing |
3.5 Timing Characteristics
3.5.1 8080 Series MCU Parallel Interface Characteristics: 9/8-bit Bus
Test conditions: VDDI=1.65 to 3.3V, VDD=2.4 to 3.3V, AGND=DGND=0V, Ta=25°C.
| Signal | Symbol | Parameter | Min | Max | Unit | Description |
|---|---|---|---|---|---|---|
| D/CX | TAST | Address setup time | 0 | -- | ns | - |
| D/CX | TAHT | Address hold time (Write/Read) | TBD | -- | ns | - |
| CSX | TCHW | Chip select \"H\" pulse width | TBD | -- | ns | - |
| CSX | TCS | Chip select setup time (Write) | TBD | -- | ns | - |
| WRX | TWC | Write cycle | TBD | -- | ns | - |
| WRX | TWRH | Control pulse \"H\" duration | TBD | -- | ns | - |
| WRX | TWRL | Control pulse \"L\" duration | TBD | -- | ns | - |
| D[8:0] | TDST | Data setup time | TBD | -- | ns | For CL=30pF |
| D[8:0] | TDHT | Data hold time (Write) | TBD | -- | ns | For CL=30pF |
| RDX (ID) | TRC | Read cycle (ID) | TBD | -- | ns | When read ID data |
| RDX (ID) | TRDH | Control pulse \"H\" duration (ID) | TBD | -- | ns | When read ID data |
| RDX (ID) | TRDL | Control pulse \"L\" duration (ID) | TBD | -- | ns | When read ID data |
| RDX (FM) | TRCFM | Read cycle (FM) | TBD | -- | ns | When read from frame memory |
| RDX (FM) | TRDHFM | Control pulse \"H\" duration (FM) | TBD | -- | ns | When read from frame memory |
3.6 Electro-Optical Characteristics (Ta=25°C)
| Item | Symbol | Condition | Min. | Typ. | Max. | Unit | Remark |
|---|---|---|---|---|---|---|---|
| Response time | Tr + Tf | θx = θy =0 | -- | -- | 35 | ms | Note 1 |
| Contrast Ratio | CR | θx = θy =0 | 1000 | 1500 | -- | -- | Note 2 |
| Transmittance | T% | θx = θy =0 | 4.5 | 4.8 | -- | % | -- |
| Color Chromaticity (CIE1931) White | W x, W y | θx = θy =0 | -- | (0.301, 0.320) | -- | -- | -- |
| Viewing angle (All directions) | θT, θB, θL, θR | CR > 10 | -- | 85 | -- | Deg. | Note 3 |
3.7 Design Notes from Documentation
- B/L Driver: The backlight driving condition is IF=80mA, Vf=3.1V (TYP) for 4 parallel LEDs.
- Mechanical: Tolerance of segments to edge of glass: ±0.2mm. The FPC includes PI reinforcement with a total thickness of 0.3mm (FPC+PI补强). Silver paste points are used for ESD protection.
- 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: RoHS compliance is expected.
4. Application Guidelines & Critical Notes
- Power Supply: The module requires a 2.8V (Typ.) power supply for VCC and 1.8V (Typ.) for VDDI. Ensure the power supply ripple is minimized.
- Interface: This module uses a standard 8-bit 8080 parallel interface. The microcontroller must be configured for this protocol, managing signals such as CS, RS, RD, WR, and the 8-bit data bus D0-D7.
- Backlight Driver (External): An external constant current driver is required to supply a typical current of 80mA at a forward voltage of 3.1V.
- Reset: A hardware reset pin (RESET, Pin 1) is provided. A reset pulse must be applied to properly initialize the chip.
- Handling Precautions: Handle the module with care to avoid damage to the glass or FPC. Ground yourself to prevent electrostatic discharge (ESD).
5. Conclusion & Design-In Support
The LS028I31-M-V1 from Lesson Smart Display Technology is a 2.83-inch TFT-LCD module with an IPS panel. It is a bright, high-contrast solution suitable for a wide variety of embedded display applications requiring wide viewing angles and good color performance in a compact form factor.
For successful design-in, engineers should:
- Obtain and review the complete, official Product Specification (Revision 1.0) for the full mechanical drawing and the ST7789P3 driver IC datasheet for detailed command initialization.
- Design a clean 2.8V/1.8V power supply and a backlight constant current driver circuit capable of delivering 80mA at 3.1V.
- Configure the host MCU's parallel interface to match the 8-bit 8080 timing specifications detailed in this datasheet.
- 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 for a wide array of applications.
