Introduction
This document outlines the specifications for the LS0154I05-S-V2, a 1.54-inch square transmissive a-Si TFT-LCD module from LESSON Smart Display. Featuring a 240x240 pixel resolution and support for 262 thousand colors, this module is designed for applications requiring a compact, square graphical display. Driven by the popular ST7789P3 controller with an SPI interface, it offers a simple and efficient solution for wearable technology, smart accessories, and portable devices where space and power are key constraints.
Key Specifications
- Brand & Model: LESSON Smart Display LS0154I05-S-V2
- Screen Size: 1.54 inches (diagonal)
- Active Area: 27.72 mm (H) × 27.72 mm (V) (Perfect Square)
- Driver IC: ST7789P3
- Display Technology: Transmissive type a-Si TFT-LCD
- Display Mode: Active matrix TFT, Transmissive type, IPS (In-Plane Switching)
- Module Type: COG + FPC + B/L
- Display Resolution: 240(RGB) × 240 pixels (Square)
- Display Colors: 262 Thousand Colors
- Module Outline Dimensions: 31.52 mm (H) × 33.72 mm (V) × 2.04 mm (D)
- Interface: SPI (Pins: CS, SCLK, SDA, DCX, RST). Also includes a TE (Tearing Effect) output pin.
- Input Data: SPI (as per Physical Features table)
- Supply Voltage (VCC): 2.4V to 3.3V (Typical: 2.8V)
- I/O Voltage (IOVCC): 1.65V to 3.3V (Typical: 1.8V)
- Operating Temperature: -20°C to +70°C
- Storage Temperature: -30°C to +80°C
- Viewing Direction: IPS (In-Plane Switching)
- Backlight: 3-chip white LED in parallel (Drive condition: If=60mA, Vf=3V Typ.)
General Description
The LS0154I05-S-V2 is a classic square display module built around the widely-used ST7789P3 driver IC. This IC is known for its efficiency and support for square resolutions, making it a common choice in the maker community and commercial products alike. The module communicates via a standard SPI interface, requiring only a few pins (Chip Select CS, Serial Clock SCLK, Serial Data SDA, Data/Command DCX, and Reset RST) for control, which simplifies connection to any microcontroller.
A key feature is its IPS (In-Plane Switching) panel, which provides excellent wide viewing angles and consistent color without the grayscale inversion common in older TN panels—this is crucial for wearable devices viewed from various angles. The module includes a TE (Tearing Effect) output signal to help synchronize graphics updates. The mechanical drawing contains important integration notes, such as ROHS compliance and recommendations for bezel design (housing opening should be 0.3mm smaller per side than the active area). The electrical characteristics define the voltage levels for the power supplies and digital I/O.
Application Scenarios
This square SPI module is perfectly suited for compact, interactive devices:
- Smartwatches and Fitness Trackers: As the main display for watch faces and health metrics.
- Wearable Health Monitors: For compact pulse oximeters, glucose monitors, or ECG devices.
- Portable Electronic Devices: Handheld games, mini music players, or tool interfaces.
- IoT and Smart Home Devices: Status displays for smart switches, sensors, or environment monitors.
- Hobbyist and Maker Projects: Due to the common ST7789 driver and SPI interface, it's easy to prototype with.
Conclusion
The LESSON Smart Display LS0154I05-S-V2 is an accessible and capable small square display solution. Its use of the standard ST7789P3 driver IC, simple SPI interface, IPS technology for wide viewing angles, and clear square format make it an extremely practical and popular choice for designing modern, compact electronic products with a quality graphical interface.
