LS024T32-M-V1 | 2.4 inch TFT-LCD Module | 240x320 | 262k Colors | SPI & 8080
1. Executive Summary & Product Positioning
The LS024T32-M-V1 is a 2.4-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 2.4 inch and the resolution is 240(RGB)*320, the panel can display up to 262k colors.
Product Positioning: Designed as a cost-effective, compact display solution for a wide range of embedded applications. Typical uses include portable instruments, smart home control panels, small handheld devices, and other human-machine interface (HMI) systems where a small form factor and adequate color display are required.
2. Detailed Product Overview & Architecture
The module's architecture is designed for robust performance and easy integration. The primary components include:
- TFT-LCD Panel: 2.4-inch diagonal, a-Si TFT active matrix, transmissive, TN (Twisted Nematic) normally white mode. Resolution is 240(RGB) × 320 pixels with an active area of 36.72 × 48.96 mm.
- Driver IC: The module uses the ST7789P3 driver IC, which supports an 8-bit 8080 and SPI parallel interface.
- 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 42.72 × 60.26 × 2.3 mm.
- Interface: The module communicates via a 24-pin FPC connector. The display interface can be configured as 8-bit 8080 parallel or SPI (serial) via IM pins.
- Viewing Direction: TN (6 O'Clock).
3. Exhaustive Technical Specifications
3.1 General & Mechanical Specifications
| Item | Specification |
| Display Size (Diagonal) | 2.4 inches |
| Resolution (Dots) | 240(RGB) × 320 |
| Display Technology | Active Matrix TFT, Transmissive, a-Si, TN |
| Module Construction | COG+FPC+B/L |
| Driver IC | ST7789P3 |
| Input Data Interface | 8-bit 8080 / SPI |
| Module Size (H×V×D) | 42.72 × 60.26 × 2.3 mm |
| Active Area (H×V) | 36.72 × 48.96 mm |
| Display Mode | Transmissive, TN, Normally White |
| Operating Temperature | -20°C to +70°C |
| Storage Temperature | -30°C to +80°C |
3.2 Absolute Maximum Ratings
Stress beyond those listed may cause permanent damage.
| Parameter | Symbol | Min | Max | Unit | Remark |
|---|---|---|---|---|---|
| Supply voltage (VDD) | VDD | -0.3 | 4.6 | 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
| Parameter | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Supply voltage | VDD | 2.4 | 2.8 | 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 circuit consists of 4 White LED chips connected in Parallel (K1, K2, K3, K4 to a common node). The driving condition is IF=80mA, Vf=2.8-3.2V (TYP).
| Parameter | Symbol | Typ | Unit |
|---|---|---|---|
| Forward Voltage (Total) | Vf | 2.8-3.2 | V |
| Forward Current | IF | 80 | mA |
3.4 Interface Pin Assignment (24-Pin FPC)
Connector: 24-pin FPC. The interface mode is selected via IM3, IM2, IM1, IM0 pins.
| Pin No. | Symbol | I/O | Description |
|---|---|---|---|
| 1-8 | NC | -- | No Connection |
| 9 | RS/DCX/SCL | I | Data/Command selection (parallel) or serial clock (SPI) |
| 10 | SDA | I/O | SPI data input/output |
| 11 | DB0 | I | Parallel interface data bus bit 0 |
| 12 | DB1 | I | Parallel interface data bus bit 1 |
| 13 | DB2 | I | Parallel interface data bus bit 2 |
| 14 | DB3 | I | Parallel interface data bus bit 3 |
| 15 | DB4 | I | Parallel interface data bus bit 4 |
| 16 | DB5 | I | Parallel interface data bus bit 5 |
| 17 | DB6 | I | Parallel interface data bus bit 6 |
| 18 | DB7 | I | Parallel interface data bus bit 7 |
| 19 | RESET | I | Reset signal (Active low) |
| 20 | VDD2.8V | P | Power Supply (VDD) |
| 21 | IM0 | I | Interface mode selection pin 0 |
| 22 | IM1 | I | Interface mode selection pin 1 |
| 23 | IM2 | I | Interface mode selection pin 2 |
| 24 | GND | P | Ground |
Note: IM3 = 0 (no pin). The interface mode is set by IM[2:0]: 000 = 80-8bit parallel I/F, 010 = 3-line 9bit serial I/F, 100 = 2 data lane serial I/F, 110 = 4-line 8bit serial I/F.
3.5 Electro-Optical Characteristics (Ta=25°C)
| Item | Symbol | Condition | Min. | Typ. | Max. | Unit | Remark |
|---|---|---|---|---|---|---|---|
| Response time | Tr + Tf | θx = θy =0 | -- | 30 | -- | ms | Note 1 |
| Contrast Ratio | CR | θx = θy =0 | -- | 250 | -- | -- | Note 2 |
| Transmittance | T% | θx = θy =0 | 4 | 4.7 | -- | % | |
| Color Chromaticity (CIE1931) White | Wx, Wy | θx = θy =0 | -- | (0.308, 0.325) | -- | -- | |
| Viewing angle (Top) | θT | CR > 10 | -- | 45 | -- | Deg. | Note 3 |
| Viewing angle (Bottom) | θB | CR > 10 | -- | 20 | -- | Deg. | Note 3 |
| Viewing angle (Left) | θL | CR > 10 | -- | 45 | -- | Deg. | Note 3 |
| Viewing angle (Right) | θR | CR > 10 | -- | 45 | -- | Deg. | Note 3 |
3.6 Inspection Standards & Design Notes
- AQL: Acceptable Quality Level per GB/T 2828-2003 (Normal inspection, Class II). Major defect AQL = 0.65, Minor defect AQL = 1.5.
- B/L Driver: Driving condition: IF=80mA, Vf=2.8-3.2V (TYP).
- Mechanical: Tolerance of segments to edge of glass: ±0.2mm. 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 on each side. The housing foam window should be at least 0.6mm larger than the VA on each side.
- Power Sequencing: The power on/off sequence must be followed. The RESX pin timing varies based on Sleep In/Out mode.
4. Application Guidelines & Critical Notes
- Power Supply: The module requires a typical 2.8V power supply (VDD) with a range of 2.4V to 3.3V. Ensure the power supply ripple is minimized.
- Interface Selection: The interface mode (parallel 8080 or serial SPI) is selected via the IM[2:0] pins. Ensure the correct mode is selected to match your microcontroller's interface.
- 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 for the 4 parallel LEDs.
- Reset: A hardware reset pin (RESET, Pin 19) is provided. The reset pulse width must be a minimum of 6µs.
- Handling Precautions: Handle the module with care to avoid damage to the glass or FPC. Ground yourself to prevent electrostatic discharge (ESD). Do not press the display surface with sharp objects.
5. Conclusion & Design-In Support
The LS024T32-M-V1 from Lesson Smart Display Technology is a compact 2.4-inch TFT-LCD module with a standard 240×320 resolution and a TN display. It is a cost-effective solution for applications that require a small, reliable, and easy-to-integrate color display with either an 8080 parallel or SPI interface.
For successful design-in, engineers should:
- Obtain and review the complete, official Product Specification (Revision 1.0) for the full mechanical drawing, the ST7789P3 driver IC datasheet for detailed command initialization, and confirmation of the backlight circuit configuration.
- Design a clean 2.8V 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 for a wide array of embedded systems.
