LS028I25-R-V1 | 2.83 inch TFT-LCD Module | 240x320 | IPS | SPI & RGB
1. Executive Summary & Product Positioning
The LS028I25-R-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 an IPS (In-Plane Switching) panel, offering superior viewing angles (up to 85 degrees in all directions) and good color reproduction. It is designed for a wide range of embedded and industrial applications requiring a compact, colorful display. Typical uses include smart home control panels, portable instruments, handheld devices, and other human-machine interface (HMI) systems.
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) × 57.60 (V) mm.
- Driver IC: The module uses the JD9853 driver IC.
- Display Mode: Transmissive, IPS.
- Backlight Unit (B/L): A white LED backlight unit with 4 Chip-White LEDs in Parallel. The typical driving condition is IF=80mA, Vf=2.8-3.2V (TYP).
- Mechanical Construction: COG (Chip-on-Glass) + FPC + B/L. The module outline dimensions are 46.5 (H) × 65.05 (V) × 2.11 (D) mm.
- Interface: The module supports a **4-wire SPI** interface for command and data, as well as a **6/16-bit RGB** interface for data.
- Viewing Direction: IPS (All directions).
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 | IPS (All Views) |
| Input Data Interface | 4-wire SPI + 6/16-bit RGB |
| Driver IC | JD9853 |
| Module Size (H×V×D) | 46.5 × 65.05 × 2.11 mm |
| Active Area (H×V) | 43.2 × 57.60 mm |
| Display Mode | Transmissive, IPS |
| 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 |
| I/O Supply voltage | 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 (Ta=25°C)
3.3.1 Recommended Operating Conditions
| Parameter | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Supply voltage | VCC | 2.4 | 2.8 | 3.3 | V |
| I/O supply voltage | IOVCC | 1.65 | 1.8 | 3.3 | V |
| Input voltage (Low level) | VIL | 0 | -- | 0.3*IOVCC | V |
| Input voltage (High level) | VIH | 0.7*IOVCC | -- | IOVCC | V |
3.3.2 Backlight LED Characteristics
The backlight consists of 4 White LED chips connected in Parallel.
| Parameter | Symbol | Typ | Unit |
|---|---|---|---|
| Forward Voltage (Total) | Vf | 2.8-3.2 | V |
| Forward Current | IF | 80 | mA |
3.4 Interface Pin Assignment (26-Pin FPC)
Connector: 26-pin FPC.
| Pin No. | Symbol | I/O | Description |
|---|---|---|---|
| 1, 14, 15, 19-26 | NC | -- | No Connection |
| 2 | CS | I | Chip select input pin. (for SPI mode) |
| 3 | SDA | I/O | Serial in/out signal in SPI interface. (for SPI mode) |
| 4 | SCL | I | This pin is used to be serial interface clock. (for SPI mode) |
| 5 | HS | I | Line synchronizing signal for RGB interface operation. (for RGB mode) |
| 6 | VS | I | Frame synchronizing signal for RGB interface operation. (for RGB mode) |
| 7 | DCLK | I | Dot clock signal for RGB interface operation. (for RGB mode) |
| 8 | D5 | I | RGB interface data bus. (Bit 5) |
| 9 | D4 | I | RGB interface data bus. (Bit 4) |
| 10 | D3 | I | RGB interface data bus. (Bit 3) |
| 11 | D2 | I | RGB interface data bus. (Bit 2) |
| 12 | D1 | I | RGB interface data bus. (Bit 1) |
| 13 | D0 | I | RGB interface data bus. (Bit 0) |
| 16 | GND | P | Ground |
| 17 | VDD | P | Power supply (VCC) |
| 18 | VDDIO | P | Power supply (IOVCC) |
Note: This model uses an SPI interface for command and initial configuration, and the D[5:0] pins (6-bit) for RGB data. This configuration implies a 6-bit (18-bit per pixel) RGB interface is used. The JD9853 driver IC is likely configured to operate in this mode. Please refer to the full datasheet for detailed configuration instructions.
3.5 Timing Characteristics (SPI Mode)
The timing parameters for the 3-line SPI interface provided in the spec.
| Signal | Symbol | Parameter | Min. | Max. | Unit |
|---|---|---|---|---|---|
| CSX | tcss (Write) | Chip select setup time | 15 | -- | ns |
| CSX | tcsh (Write) | Chip select hold time | 15 | -- | ns |
| CSX | tcss (Read) | Chip select setup time | 60 | -- | ns |
| CSX | tcsh (Read) | Chip select hold time | 65 | -- | ns |
| CSX | tchw | Chip select "H" pulse width | 40 | -- | ns |
| SCL (write) | twc | Write cycle | 16 | -- | ns |
| SCL (write) | twrh | Control pulse "H" duration | 7 | -- | ns |
| SCL (write) | twrl | Control pulse "L" duration | 7 | -- | ns |
| SCL (read) | trc | Read cycle | 150 | -- | ns |
| SDI/SDO (write) | tds | Data setup time | 7 | -- | ns |
| SDI/SDO (write) | tdt | Data hold time | 7 | -- | ns |
| SDI/SDO (read) | tracc | Read access time | 20 | -- | ns |
| SDI/SDO (read) | tod | Output disable time | 25 | -- | ns |
3.6 Timing Characteristics (RGB I/F Mode)
General timings for the RGB interface. Test conditions: Ta=25°C, IOVCC=1.8V, VCI=2.8V.
| Item | Symbol | Condition | Min. | Max. | Unit |
|---|---|---|---|---|---|
| Vertical sync. setup time | VSST | -- | 25 | -- | ns |
| Vertical sync. hold time | VSHT | -- | 25 | -- | ns |
| Horizontal sync. setup time | HSST | -- | 25 | -- | ns |
| Horizontal sync. hold time | HSHT | -- | 25 | -- | ns |
| Pixel clock cycle (RGB I/F) | PCLKCYC | -- | 55 | -- | ns |
| Pixel clock low time | PCLKLT | -- | 25 | -- | ns |
| Pixel clock high time | PCLKHT | -- | 25 | -- | ns |
| Data setup time D[23:0] | DST | -- | 25 | -- | ns |
| Data hold time D[23:0] | DHT | -- | 25 | -- | ns |
3.7 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 | Wx, Wy | θx = θy =0 | -- | (0.301, 0.320) | -- | -- | |
| Viewing angle (Top) | θT | CR > 10 | -- | 85 | -- | Deg. | Note 3 |
| Viewing angle (Bottom) | θB | CR > 10 | -- | 85 | -- | Deg. | Note 3 |
| Viewing angle (Left) | θL | CR > 10 | -- | 85 | -- | Deg. | Note 3 |
| Viewing angle (Right) | θR | CR > 10 | -- | 85 | -- | Deg. | Note 3 |
| Luminance (IF = 80mA) | L | -- | -- | 300 | -- | cd/m² | Note 4 |
3.8 Design Notes from Documentation
- B/L Driver: The backlight driving condition is IF=80mA, Vf=2.8-3.2V (TYP).
- Mechanical: Tolerance of segments to edge of glass: ±0.2mm. It is also noted that the TP edge should not contact metal conductors.
- 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.
4. Application Guidelines & Critical Notes
- Power Supply: The module requires a 2.8V (Typ.) power supply for VCC and 1.8V (Typ.) for IOVCC. Ensure the power supply ripple is minimized.
- Interface Selection: This module uses a combination of SPI (for command/control) and RGB (for pixel data) interfaces. The microcontroller must be configured to drive both interfaces correctly.
- Backlight Driver (External): An external constant current driver is required to supply a typical current of 80mA at a forward voltage of 2.8-3.2V.
- Reset: A hardware reset pin is not listed in the pin description for the 26-pin connector. The datasheet suggests the reset function is handled through a command (software reset) via the SPI interface. Please confirm with the full datasheet.
- 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 LS028I25-R-V1 from Lesson Smart Display Technology is a 2.83-inch TFT-LCD module with an IPS panel and a resolution of 240×320. It is a compact, low-power solution suitable for a variety of embedded display applications.
For successful design-in, engineers should:
- Obtain and review the complete, official Product Specification (Revision 1.0) for the full mechanical drawing, the JD9853 driver IC datasheet for detailed command initialization, and confirmation of the backlight circuit configuration.
- Design a clean 2.8V/1.8V power supply and a backlight constant current driver circuit capable of delivering 80mA.
- 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 cost-effective display solution.
