Product Main Title:
LS028I13-M-V1: 2.83-Inch IPS TFT LCD Module, 240x320 Resolution, 262K Colors, Parallel (8080) MCU Interface
Product Subtitle / Keywords:
2.83 Inch Display, QVGA 240x320 Resolution, Transmissive a-Si IPS TFT, 8080 Parallel Interface, COG+FPC+B/L, 262K Colors, Wide Viewing Angle, 4-Chip White LED Backlight
Comprehensive Technical Specification & Application Guide
1. Executive Summary & Product Positioning
The LS028I13-M-V1, developed by LESSON (Wan'an) Zhixian Technology Co., Ltd., is a 2.83-inch transmissive amorphous Silicon TFT-LCD module featuring IPS (In-Plane Switching) technology. This product specification book defines its structural composition, physical/mechanical parameters, electrical/optical characteristics, pin functions, timing requirements, and environmental reliability test conditions. It delivers a QVGA resolution of 240(RGB)×320 with 262K-color display capability, suitable for applications requiring explicit driving and interface specifications. The recommendation is to strictly refer to the voltage, temperature, mechanical tolerances, and reliability test requirements in the specification during design and use to ensure compatibility and long-term stability.
2. Detailed Product Overview & Architecture
- Core Technology: Transmissive-type a-Si TFT-LCD (amorphous silicon thin film transistor liquid crystal display).
- Display Characteristics: Capable of displaying up to 262 thousand colors.
- Module Construction: Composed of a TFT-LCD panel, a driver circuit, and a backlight unit.
- Interface: Parallel MCU Interface (8080-series), 8-bit data bus.
- Panel Size: 2.83 inch diagonal.
- Backlight: 4 Chip-White LEDs in parallel.
3. Exhaustive Technical Specifications
3.1 Mechanical & Physical Specifications
(Note: Specific module dimensions (H×V×D) are not provided in the given excerpt. The full document contains the mechanical drawing.)
- Active area (H×V): 43.2 × 57.6 mm (inferred from similar model LS028I26-S-V1 in knowledge base).
- Number of dots / Resolution: 240(RGB) × 320 pixel.
- Panel Size (Diagonal): 2.83 inch.
Critical Mechanical Design Notes (from document snippet):
- Display Type: Main LCD: Transmissive, IPS.
- Operating Temperature: -20°C ~ +70°C.
- Storage Temperature: -30°C ~ +80°C.
- ROHS Compliance: Yes.
- Backlight: 4 Chip-White LED Parallel.
- Bezel Opening: It is recommended that the housing's visible area be at least 0.3mm smaller per side than the module's active area.
- Foam Gasket Cutout: Should be at least 0.6mm larger per side than the module's viewing area.
- Metal Contact: The TP edges must not contact metal conductors.
- Segment to Glass Edge Tolerance: ±0.2 MM.
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, 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 |
3.2.2 Electrical Characteristics (DC)
| Item | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Supply voltage (Main) | 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 |
3.2.3 Pin Description (24-pin FPC)
| PIN NO. | Symbol | I/O | Description |
|---|---|---|---|
| 1, 2, 7, 13, 23, 24 | GND | P | Ground |
| 3 | LEDA | P | Power for LED backlight anode |
| 4 | LEDK | P | Power for LED backlight cathode |
| 5, 6 | VCI | P | Power Supply |
| 8 | TE | O | Tearing effect signal. Used to synchronize MCU to frame memory writing. |
| 9 | CS | I | Chip selection pin |
| 10 | RS | I | Display data/command selection pin in parallel interface. |
| 11 | WR | I | Write enable in MCU parallel interface. |
| 12 | RD | I | Read enable in 8080 MCU parallel interface |
| 14-21 | D0-D7 | I | Interface data bus (8-bit). |
| 22 | RESET | I | Reset signal. Must be applied to properly initialize the chip. |
3.2.4 Parallel Interface Timing Characteristics (8080-series, 8-bit bus)
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 | T_AST | Address setup time | TBD | - | ns | |
| D/CX | T_AHT | Address hold time (Write/Read) | TBD | - | ns | |
| CSX | T_CHW | Chip select "H" pulse width | TBD | - | ns | |
| CSX | T_CS | Chip select setup time (Write) | TBD | - | ns | |
| CSX | TR_CS | Chip select setup time (Read ID) | TBD | - | ns | |
| CSX | TR_CSFM | Chip select setup time (Read Frame Memory) | TBD | - | ns | |
| CSX | T_CSF | Chip select wait time (Write/Read) | TBD | - | ns | |
| CSX | T_CSH | Chip select hold time | TBD | - | ns | |
| WRX | T_WC | Write cycle | TBD | - | ns | |
| WRX | T_WRH | Control pulse "H" duration | TBD | - | ns | |
| WRX | T_WRL | Control pulse "L" duration | TBD | - | ns | |
| RDX (ID) | T_RC | Read cycle (ID) | TBD | - | ns | When reading ID data |
| RDX (ID) | T_RDH | Control pulse "H" duration (ID) | TBD | - | ns | When reading ID data |
| RDX (ID) | T_RDL | Control pulse "L" duration (ID) | TBD | - | ns | When reading ID data |
| RDX (FM) | T_RCFM | Read cycle (Frame Memory) | TBD | - | ns | When reading from frame memory |
| RDX (FM) | T_RDHFM | Control pulse "H" duration (FM) | TBD | - | ns | When reading from frame memory |
| RDX (FM) | T_RDLFM | Control pulse "L" duration (FM) | TBD | - | ns | When reading from frame memory |
| D[7:0] | T_DST | Data setup time | TBD | - | ns | For CL=30pF |
(Note: Timing parameters are listed as "TBD". The final specification defines concrete values.)
3.2.5 Backlight Unit
- Configuration: 4 Chip-White LEDs in parallel.
- Drive Condition (Typical): Forward Current (I_F) = 80 mA; Forward Voltage (V_f) = 3 V.
3.3 Optical & Electro-Optical Characteristics
| 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 | θx = θy = 0 | -- | 0.301 | -- | -- | CIE1931 |
| Color Chromaticity (White) | W y | θx = θy = 0 | -- | 0.320 | -- | -- | CIE1931 |
| Viewing Angle (CR>10) | θT, θB, θL, θR | -- | -- | 85 | -- | Deg. | Note 3 |
| Luminance | L | I_F = 80mA | -- | 300 | -- | cd/m² | Note 4 |
Notes (interpreted):
- Response time is the sum of rise and fall time.
- Contrast ratio measured with a standard pattern.
- Viewing angles are symmetrical (85° typical) due to IPS technology.
- Luminance measured at panel center with specified LED current.
4. Application Guidelines & Critical Notes
- Intended Use: Industrial controls, consumer devices, point-of-sale terminals—applications requiring a medium-sized color display with a fast parallel interface for graphics-intensive updates.
- Critical Design Considerations:
- Parallel Interface: Requires an MCU with an 8-bit parallel bus or GPIOs emulating the 8080 timing. This interface offers higher data throughput than SPI for faster screen updates.
- Dual Power Supplies: Provide stable VCC (2.4-3.3V) and IOVCC (1.65-3.3V). Ensure they are within the recommended operating range.
- Timing Compliance: The host controller must generate control signals (CS, WR, RD, RS) that meet the setup, hold, and pulse width requirements defined in the full spec's timing table.
- Mechanical Integration: Adhere to the housing design rules regarding bezel opening and foam cutout to prevent optical defects.
- Backlight Drive: Design a constant-current driver for the parallel LED string (80mA typical, 3V forward voltage per LED).
- Reset and TE: Use the RESET pin for proper initialization. The TE pin can be used for synchronized frame updates.
- Bus Loading: The 8-bit data bus (D0-D7) may require buffers or careful PCB layout if the connection is long, to maintain signal integrity.
- Handling & Compliance: The module is ROHS compliant. Observe standard ESD precautions.
5. Conclusion & Design-In Support
The LS028I13-M-V1 specification outlines a 2.83-inch IPS display with an 8080 parallel interface. Its key strengths are the wide viewing angles, higher bandwidth parallel interface suitable for dynamic graphics, and good luminance (300 cd/m²). The main design focus is on implementing the parallel bus controller with correct timing and managing the parallel LED backlight driver. This module is an excellent choice for applications where SPI bandwidth is insufficient and the host MCU has available parallel port pins or a flexible memory interface.
