Product Subtitle / Keywords:
2.83 Inch Display, 240(RGB)×320 Resolution, Transmissive a-Si TFT-LCD, RGB Interface / SPI Interface, COG+FPC+B/L, 262K Colors, ST7789T3 Driver, 46.50×69.60×2.3 mm, 300 cd/m² Luminance, 4 White LEDs, Free (IPS) Viewing Direction, -20°C~70°C Operating Temperature
1. Executive Summary & Product Positioning
The LS028I15-R-V1, developed by Lixin (Wan'an) Intelligent Display Technology Co., Ltd. (立信(万安)智显科技有限公司), is a 2.83-inch transmissive amorphous Silicon TFT-LCD (a-Si TFT-LCD) module.
This product specification (Revision 1.0, Module Type: COG+FPC+B/L) serves as the definitive technical document, defining its structural composition (COG+FPC+B/L), physical features, mechanical dimensions, absolute maximum ratings, detailed electrical characteristics, complete RGB/SPI interface pinout and timing, and comprehensive electro-optical performance. It delivers a resolution of 240(RGB)×320 with 262K-color display capability, driven by the ST7789T3 controller.
The document provides the core parameters necessary for system integration into compact embedded display applications. The unequivocal recommendation for engineers is to strictly adhere to the electrical specifications, interface timing, and mechanical tolerances 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.
- Display Mode: Active matrix TFT, Transmissive type.
- Display Format: Graphic 240(RGB)×320 Dot-matrix.
- Display Characteristics: Capable of displaying up to 262 thousand colors.
- Module Construction: COG (Chip-On-Glass) + FPC (Flexible Printed Circuit) + B/L (Backlight Unit). Composed of a TFT-LCD panel, a driver circuit and a backlight unit.
- Input Data: RGB.
- Viewing Direction (Grayscale Inversion): Free (IPS).
- Drive IC: ST7789T3.
- Approval Status: ☑ Approved Product Specification only (as per signature block).
3. Exhaustive Technical Specifications
3.1 Mechanical & Physical Specifications
Based on Chapter 2 (Physical Features) and the Outline Dimension drawing:
| Item | Specification | Unit | Note |
|---|---|---|---|
| Display Type | Main LCD: Transmissive, IPS | - | From NOTES on drawing |
| Panel Size | 2.83 | Inch | Diagonal |
| Resolution / Display Format | 240(RGB)×320 | Dots | - |
| LCM Outline Dimension (W×H) | 46.50 x 69.60 | mm | From drawing: LCM OD 46.50±0.15 |
| LCD OD Dimension (W×H) | 46.20 x 69.60 | mm | From drawing: LCD OD 46.20±0.1 |
| LCD AA (Active Area, W×H) | 43.20 x 57.60 | mm | From drawing: LCD AA 43.20 |
| Module Type | COG+FPC+B/L | - | From cover page |
| Viewing Direction | Free (IPS) | - | From Physical Features table |
| Input Data | RGB | - | From Physical Features table |
| Drive IC | ST7789T3 | - | From Physical Features table |
| Backlight | 4 Chip-White LED Parallel | - | From NOTES on drawing |
| Operating Temperature | -20°C ~ 70°C | °C | From NOTES on drawing |
| Storage Temperature | -30°C ~ 80°C | °C | From NOTES on drawing |
Critical Mechanical Design Notes (from outline dimension drawing):
- Display Type: Main LCD: Transmissive, IPS.
- Operating Temperature: -20°C ~ 70°C.
- Storage Temperature: -30°C ~ 80°C.
- Backlight: 4 Chip-White LED Parallel.
- RoHS Compliance: Required.
- Housing Cutout Recommendations:
- It is recommended that the housing's visible area be at least 0.3mm smaller than the VA (Viewing Area) on each side.
- The housing foam opening should be at least 0.6mm larger than the VA on each side.
- TP (Touch Panel) Constraint: The edge of the TP should not contact metal conductors.
- Tolerance: The tolerance of glass segments to the edge of the glass is ±0.2mm.
- Silver Paste Points:
点银浆位is indicated on the drawing. - Release Tape/Sticker: An
易撕贴手撕位(release tape tear-off point) is provided. - Yellow Insulation Paper: Indicated in the drawing (
黄色绝缘胶纸漏铜接地), used for copper exposure grounding. - FPC Total Thickness: PI补强+FPC总厚0.30mm.
- Polarizer Thickness: POL 0.15mm.
- General Tolerance: ±0.20mm (for .xx dimensions) and ∠±1/4° (for angular dimensions).
3.2 Electrical & Interface Specifications
3.2.1 Backlight Unit Characteristics
Based on the LED CIRCUIT DIAGRAM and notes:
| Characteristics | Symbol | Condition | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|---|
| Forward Voltage | Vf | $I_{L}$=80mA | 2.8 | - | 3.2 | V |
| Forward current | $I_{L}$ | - | - | 80 | - | mA |
| Luminance | L | $I_{L}$=80mA | - | 300 | - | cd/m² |
Note: The backlight circuit diagram shows 4 LEDs in parallel. The drive condition is IF=80mA, Vf=2.8-3.2V(TYP).
3.2.2 Pin Description (Selected Pins from Chapter 7-2)
The module uses a 40-pin interface. A selected list of relevant pins is provided below:
| PIN NO. | Symbol | I/O | Description |
|---|---|---|---|
| 11 | RESET | I | This signal will reset the device and it must be applied to properly initialize the chip. |
| 12 | CS | I | Chip selection pin |
| 13 | SCL | I | Serial interface Clock Input |
| 14 | SDA | I/O | Serial interface DATA Input/Output |
| 15 | GND | P | Ground |
| 16-20 | R0-R4 | I | RGB interface data bus (Red). |
| 21-26 | G0-G5 | I | RGB interface data bus (Green). |
| 27-31 | B0-B4 | I | RGB interface data bus (Blue). |
| 32 | TE | O | Tearing effect signal is used to synchronize MCU to frame memory MCU writing. |
| 33-34 | GND | P | Ground |
| 35-40 | TP_* / NC | - | Touch panel interface pins (TP_2.8V, TP_INT, TP_SCL, TP_SDA, TP_RST, TP_GND) or No Connect. |
3.2.3 Serial Interface Timing Characteristics (SPI)
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 |
|---|---|---|---|---|---|---|
| CSX | Tcss | Chip select setup time (write) | 15 | ns | ||
| CSX | TcSH | Chip select hold time (write) | 15 | ns | ||
| CSX | Tcss | Chip select setup time (read) | 60 | ns | ||
| CSX | Tscc | Chip select hold time (read) | 65 | ns | ||
| CSX | TcHW | Chip select "H" pulse width | 40 | ns | ||
| SCL | Tcycw | Serial clock cycle (Write) | 16 | ns | ||
| SCL | TSHW | SCL "H" pulse width (Write) | 7 | ns | ||
| SCL | TSLW | SCL "L" pulse width (Write) | 7 | ns | ||
| SCL | Tsycr | Serial clock cycle (Read) | 150 | ns | ||
| SCL | TSHR | SCL "H" pulse width (Read) | 60 | ns | ||
| SCL | TSLR | SCL "L" pulse width (Read) | 60 | ns | ||
| SDA (DIN) | TSDS | Data setup time | 7 | ns | ||
| SDA (DIN) | TSDH | Data hold time | 7 | ns | ||
| DOUT | TACC | Access time | 10 | 50 | ns | For maximum CL=30pF |
| DOUT | TOH | Output disable time | 15 | 50 | ns | For maximum CL=30pF |
3.2.4 RGB Interface Timing Characteristics
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 |
|---|---|---|---|---|---|
| HSYNC, VSYNC | $T_{SYNC}$ | VSYNC, HSYNC Setup Time | 30 | - | ns |
| ENABLE | $T_{ENS}$ | Enable Setup Time | 25 | - | ns |
| ENABLE | $T_{ENH}$ | Enable Hold Time | 25 | - | ns |
| DOTCLK | PWDH | DOTCLK High-level Pulse Width | 60 | - | ns |
| DOTCLK | PWDL | DOTCLK Low-level Pulse Width | 60 | - | ns |
| DOTCLK | $T_{CYCD}$ | DOTCLK Cycle Time | 120 | - | ns |
| DOTCLK | Trghr, Trghf | DOTCLK Rise/Fall time | - | 20 | ns |
| DB | $T_{PDS}$ | PD Data Setup Time | 50 | - | ns |
| DB | $T_{PDH}$ | PD Data Hold Time | 50 | - | ns |
3.2.5 Reset Timing Characteristics
Conditions: VDDI=1.65 to 3.3V, VDD=2.4 to 3.3V, AGND=DGND=0V, Ta=25°C.
| Related Pins | Symbol | Parameter | MIN | MAX | Unit |
|---|---|---|---|---|---|
| RESX | TRW | Reset pulse duration | 10 | - | us |
| RESX | TRT | Reset cancel | - | 5 | ms |
| RESX | TRT | Reset cancel | 120 | ms |
3.3 Optical Characteristics
Specifications for the optical performance are provided below.
Conditions: 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) | θx = θy =0 | - | 0.301 | - | ||
| Color Chromaticity (CIE1931) | White (W y) | θx = θy =0 | - | 0.320 | - | ||
| Viewing angle (CR>10) | θT (Top) | CR > 10 | - | 85 | - | Deg. | Note 3 |
| Viewing angle (CR>10) | θB (Bottom) | CR > 10 | - | 85 | - | Deg. | Note 3 |
| Viewing angle (CR>10) | θL (Left) | CR > 10 | - | 85 | - | Deg. | Note 3 |
| Viewing angle (CR>10) | θR (Right) | CR > 10 | - | 85 | - | Deg. | Note 3 |
| Luminance | L | I F = 80mA | - | 300 | - | cd/m2 | Note 4 |
3.4 Version Record
(Not explicitly provided in the extracted document excerpt; refer to the REVISION HISTORY section of the full specification.)
4. Application Guidelines & Critical Notes
Intended Use
- Industrial control panels and human-machine interfaces (HMIs)
- IoT display nodes and smart home controls
- Handheld instruments and consumer electronics
- Any application requiring a compact IPS display with RGB and SPI interface options
Critical Design Considerations
-
Interface Selection (RGB or SPI): This module supports both RGB and SPI interface modes. The host system must select the appropriate configuration. Detailed timing for both serial (SPI) and parallel (RGB) interfaces is provided in the specification.
-
Mechanical Integration:
- Module Outline: The LCM outline dimension is 46.50mm (W) × 69.60mm (H).
- Active Area: 43.20mm (W) × 57.60mm (H).
- Design Recommendations:
- The housing's visible area should be at least 0.3mm smaller than the VA on each side.
- The housing foam opening should be at least 0.6mm larger than the VA on each side.
- FPC: The module uses a 40-pin FPC. The total FPC thickness (with PI reinforcement) is 0.30mm.
-
Touch Panel (TP) Integration: The module includes pins for a touch panel (TP_* pins). The specification provides a key design note: the edge of the TP should not contact metal conductors, and the tolerance for glass segments to the edge is ±0.2mm. The TP interface pins are shared with NC pins, allowing for either a touch panel or a standard display module.
-
Optical Performance:
- IPS Display: Offers wide viewing angles (up to 85° in all directions) with no grayscale inversion, ideal for applications where the display is viewed from multiple angles.
- High Contrast Ratio: 1500 (Typ) for sharp and clear images.
- Luminance: 300 cd/m² (Typ) with a backlight current of 80mA, ensuring good indoor readability.
-
Power Supply:
- Logic Supply: Requires VDDI (1.65 to 3.3V) and VDD (2.4 to 3.3V).
- Backlight Supply: Requires a constant-current drive of 80mA at a forward voltage of 2.8V to 3.2V.
-
Temperature Limits:
- Operating Temperature: -20°C to +70°C.
- Storage Temperature: -30°C to +80°C.
Handling & Compliance
- Observe standard ESD precautions during handling and assembly.
- The module contains fragile glass and an FPC – handle with care.
- Avoid bending the FPC sharply, especially near the connector interface.
- Comply with RoHS requirements.
5. Conclusion & Design-In Support
The LS028I15-R-V1 specification details a high-performance 2.83-inch IPS display module with RGB and SPI interfaces and an ST7789T3 driver — an excellent choice for applications requiring wide viewing angles and interface flexibility.
Key Strengths:
- IPS Display Technology: Provides superior, consistent image quality from any viewing angle (85° in all directions), distinguishing it from standard TN displays.
- Dual-Interface Support (RGB/SPI): The ability to use either RGB or SPI interface provides maximum flexibility to match the host system’s architecture.
- Excellent Contrast Ratio: A typical contrast ratio of 1500:1 ensures deep blacks and bright whites for sharp images.
- Design-Friendly Optical Performance: The response time (max 35ms) and luminance (300 cd/m² typ) are well-suited for dynamic content and general indoor use.
- Clear Mechanical Guidelines: The specification includes detailed mechanical recommendations for housing design (cutout sizes, foam opening) and TP integration.
Main Design Focus:
- The critical design task is to ensure the housing design adheres to the mechanical recommendations (e.g., 0.3mm smaller visible area, 0.6mm larger foam opening) and that the interface mode (RGB or SPI) is correctly implemented.
- Supporting requirements:
- Provide stable power supplies for the logic (VDDI, VDD) and a constant-current backlight driver set to 80 mA.
- Mechanical integration — the module outline is 46.50mm × 69.60mm × 2.3mm.
- FPC connector — verify the 40-pin FPC and compatible touch panel if required.
This module is an outstanding choice for any design that prioritizes display quality from all angles, such as smart home devices, portable instruments, and any embedded product requiring a high-performance, versatile display.
