Product Main Title:
LS028I31-M-V1: 2.83-Inch IPS TFT LCD Module, 240x320 Resolution, 262K Colors, 8080 Parallel Interface
Product Subtitle / Keywords:
2.83 Inch Display, QVGA 240x320 Resolution, Transmissive a-Si IPS TFT, 8080 MCU Parallel Interface, COG+FPC+B/L, 262K Colors, Wide Viewing Angle, Detailed Parallel Timing & Pinout
Comprehensive Technical Specification & Application Guide
1. Executive Summary & Product Positioning
The LS028I31-M-V1, developed by LESSON (Wan'an) Zhixian Technology Co., Ltd., is a 2.83-inch transmissive amorphous Silicon TFT-LCD module with an IPS (In-Plane Switching) panel for wide viewing angles. This product specification book serves as the definitive technical document, meticulously defining its structural composition (COG+FPC+B/L), mechanical dimensions, absolute maximum ratings, detailed electrical characteristics, precise 8080-series MCU parallel interface timing, and electro-optical performance. It delivers a QVGA resolution of 240(RGB)×320 with 262K-color display capability. The document provides a complete foundation for integration, covering physical structure, electrical limits, and parallel bus protocol. The unequivocal recommendation for engineers is to strictly adhere to the mechanical tolerances, voltage and temperature limits, and parallel interface timing described herein to ensure reliable module operation and optimal display performance.
2. Detailed Product Overview & Architecture
- Core Technology: Transmissive-type a-Si TFT-LCD with IPS technology.
- Display Characteristics: Capable of displaying up to 262K 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.
- Interface: 8080-series MCU parallel interface (9/8-bit bus).
- Viewing Direction: IPS (wide viewing angle).
3. Exhaustive Technical Specifications
3.1 Mechanical & Physical Specifications
- Panel Size (Diagonal): 2.83 inches
- Active Area (H×V): 43.2 mm × 57.6 mm
- Module Size (H×V×D): 50.0 mm × 69.1 mm × 2.3 mm
- Resolution: 240 (RGB) × 320 pixels
- Display Mode: Transmissive a-Si TFT-LCD, IPS
3.2 Electrical & Interface Specifications
3.2.1 Absolute Maximum Ratings
| Item | Symbol | Min | Max | Unit | Remark |
|---|---|---|---|---|---|
| Supply voltage | VCC | -0.3 | 4.6 | V | Note1,2 |
| I/O Supply voltage | IOVCC | -0.3 | 4.0 | V | Note1,2 |
| Operating temperature | TOPR | -20 | 70 | °C | Note1,2 |
| Storage temperature | TSTR | -30 | 80 | °C | Note1,2 |
3.2.2 Electrical Characteristics (DC)
Specific min/typ/max values for VCC, IOVCC, VIL, VIH are not provided in the excerpt. Refer to the full document or typical values from similar models (e.g., VCC: 2.4-3.3V, IOVCC: 1.65-3.3V).
3.2.3 Pin Description (24-pin FPC)
| PIN NO. | Symbol | I/O | Description |
|---|---|---|---|
| 1 | RESET | I | Reset signal. Must be applied to properly initialize the chip. |
| 2-9 | D7-D0 | I | 8-bit interface data bus (D7 is MSB). |
| 10 | RS | I | Display data/command selection pin (High: Data, Low: Command). |
| 11 | CS | I | Chip selection pin (active low). |
| 12 | WR | I | Write enable strobe (active low). |
| 13 | RD | I | Read enable strobe for 8080 interface (active low). |
| 14, 15 | K | P | Power for LED backlight cathode. |
| 16, 17 | A | P | Power for LED backlight anode. |
| 18, 19 | VCC | P | Main power supply (2.4-3.3V). |
| 20, 21 | GND | P | Ground. |
| 22, 23 | NC | Not Connected. | |
| 24 | TE | O | Tearing effect output signal. Synchronizes MCU frame writing to LCD refresh. |
3.2.4 8080 Parallel Interface Timing Characteristics
The specification provides detailed AC timing parameters for the 8080 interface under conditions: VDDI=1.65-3.3V, VDD=2.4-3.3V, Ta=25°C. Key parameters include:
- Write Cycle: Control pulse "L" duration (
T_WRL). - Read Cycle (ID & Frame Memory): Read cycle time (
T_RC,T_RCFM), and control pulse "H"/"L" durations (T_RDH,T_RDL,T_RDHFM,T_RDLFM). - Note: Many timing values are listed as "TBD" (To Be Determined) in the provided excerpt. The full document must be consulted for numerical min/max values.
3.2.5 Backlight Unit
- Configuration: 4-chip White LED in parallel.
- Drive Condition: Forward Current (I_F) = 80mA (Typical); Forward Voltage (V_f) = 3.1V (Typical).
3.3 Optical & 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 (White) | W x, W y | θx=θy=0 | - | 0.301, 0.320 | - | - | CIE1931 |
| Viewing Angle (CR>10) | θT, θB, θL, θR | - | - | 85 | - | Deg. | Note 3 |
Viewing Angle Definition: Measured at the center with a BM-5A. Angles (θT, θB, θL, θR) correspond to 12, 6, 9, and 3 o'clock directions, respectively.
4. Application Guidelines & Critical Notes
- Intended Use: Industrial HMIs, portable medical devices, consumer electronics, instrumentation—applications requiring a medium-sized display with excellent viewing angles and a parallel interface for potentially higher bandwidth or simpler MCU integration.
- Critical Design Considerations:
- Parallel Bus Resources: This interface requires a significant number of host MCU pins (8 data + 4 control + reset + optional TE). Ensure your MCU has sufficient GPIOs.
- Timing Parameters Are Critical: The host must generate WR, RD, and CS strobes with precise timing relative to the data bus and RS signal. Obtain the final timing values (replace TBDs) from the supplier before finalizing your design.
- Dual Power Supplies: Provide stable power for VCC (panel analog, ~2.8V) and IOVCC (I/O logic, ~1.8V). Note the different absolute maximum ratings (VCC max 4.6V, IOVCC max 4.0V).
- Backlight Driver: Use a constant-current driver capable of providing 80mA for the four parallel LEDs. Consider thermal management for the LEDs at this current.
- Tearing Effect (TE) Pin: Utilize the TE output pin to synchronize the host's frame buffer updates with the LCD's internal refresh cycle, eliminating visible tearing artifacts during rapid screen updates.
- Mechanical Integration: Follow the outline dimension notes: housing bezel opening should be at least 0.3mm smaller per side than the active area; foam cutout should be at least 0.6mm larger per side than the VA (viewing area).
- Handling & Compliance: Module is ROHS compliant. Observe standard ESD precautions.
5. Conclusion & Design-In Support
The LS028I31-M-V1 specification details a robust 2.83-inch IPS display module with a traditional 8080 parallel interface. Its key strengths are the excellent 85-degree viewing angles provided by IPS technology and the parallel interface suited for MCUs without high-speed serial peripherals. The main design challenge is the high pin count and the need for the host to generate compliant bus timing. Engineers must obtain the final numerical timing parameters to ensure reliable communication. The inclusion of a TE pin is a valuable feature for smooth graphics rendering. By carefully following the electrical, mechanical, and thermal specifications—particularly the backlight drive conditions—this module can serve as a high-quality visual interface for a wide range of embedded applications.
