Tags & Keywords
#TFT-LCD #IPS #SPI #1.54inch #240x240 #262KColors #COG #SquareDisplay #WearableTech #IndustrialHMI #PortableDevice #MCUInterface #WideViewingAngle #RoHS #Backlight #LESSON #SmartDisplay
Introduction
This document is the official product specification for the LS0154I06-S-V1, a compact 1.54-inch square transmissive a-Si TFT-LCD module developed by LESSON Smart Display Technology Co., Ltd. Featuring a square 240x240 pixel resolution, 262K color depth, and an IPS panel for wide viewing angles, this module is designed for applications requiring a symmetrical and space-efficient display. Controlled via a standard 4-line SPI interface, it offers a reliable and straightforward solution for integrating a graphical display into smartwatches, wearable devices, portable instruments, and various embedded systems.
Key Specifications
- Brand & Model: LESSON Smart Display LS0154I06-S-V1
- Screen Size: 1.54 inches (diagonal)
- Active Area: 27.72 mm (H) × 27.72 mm (V) (Square)
- Driver IC: ST7789P3 (as indicated in the Physical Features section)
- Display Technology: Transmissive type a-Si TFT-LCD (Amorphous Silicon Thin Film Transistor Liquid Crystal Display)
- Display Mode: Transmissive, IPS (In-Plane Switching)
- Module Type: COG + FPC + B/L (Chip-On-Glass, Flexible Printed Circuit, Backlight Unit)
- Display Resolution: 240(RGB) × 240 pixels (Square)
- Display Colors: 262 Thousand Colors (262K)
- Module Outline Dimensions: 31.52 mm (H) × 32.0 mm (V) × 2.04 mm (D)
- Interface: 4-line Serial Interface (SPI) (Pins: CS, SCL, SDA, DC, RESET). Includes a TE (Tearing Effect) output pin.
- Viewing Direction: All (IPS characteristic)
- Supply Voltages:
- VCC (Main Power): 2.4V ~ 3.3V (Typical: 2.8V)
- IOVCC (I/O Power): 1.65V ~ 3.3V (Typical: 1.8V)
- Absolute Maximum Ratings:
- VCC / IOVCC: -0.3V to +4.6V
- Operating Temperature (T_OPR): -20°C to +70°C
- Storage Temperature (T_STR): -30°C to +80°C
- Backlight: 3-chip white LED in parallel (Drive condition: I_F=60mA, V_F=3.0V Typical)
- Environmental Compliance: RoHS Compliant
General Description
The LS0154I06-S-V1 is a highly integrated, square-format display module ideal for applications where a symmetrical interface is preferred, such as watch faces, icons, or circular menus. Its square IPS panel ensures consistent color and contrast across wide viewing angles—a critical feature for devices viewed from various orientations.
The heart of the module is the ST7789P3 driver IC, a popular and well-supported controller. Communication is handled through a 4-line SPI interface, requiring minimal host MCU pins (Chip Select, Clock, Data, Command/Data, Reset). The inclusion of a TE (Tearing Effect) output allows the host processor to synchronize frame buffer updates with the LCD's refresh cycle, preventing visual tearing artifacts.
The specification provides comprehensive SPI timing characteristics for write operations, including detailed parameters for chip select, clock cycles, and data setup/hold times. The document also outlines critical mechanical design guidelines, such as recommending the bezel opening to be 0.3mm smaller per side than the active area (LCD AA) and ensuring the backlight foam gasket opening is at least 0.3mm larger per side.
Pin Description
| PIN NO. | Symbol | I/O | Description |
|---|---|---|---|
| 1 | LEDK | P | Backlight LED Cathode |
| 2 | GND | P | Ground |
| 3 | TE | O | Tearing Effect Output |
| 4 | SDA | I | SPI Serial Data Input |
| 5 | D/C | I | SPI Data/Command Selection |
| 6 | SCL | I | SPI Serial Clock |
| 7 | CS | I | SPI Chip Select (Active Low) |
| 8 | RESET | I | Reset (Active Low) |
| 9 | IOVCC | P | I/O Interface Power (1.8V Typ.) |
| 10 | VCC | P | Main Power Supply (2.8V Typ.) |
| 11 | VCC | P | Main Power Supply (2.8V Typ.) |
| 12 | GND | P | Ground |
| 13 | GND | P | Ground |
| 14 | LEDA | P | Backlight LED Anode |
| 15 | LEDA | P | Backlight LED Anode |
Application Scenarios
- Wearable Devices: Smartwatches, fitness trackers, smart bands.
- Portable Medical Devices: Handheld monitors, glucose meters, medical sensors.
- Industrial Handhelds: Data loggers, meter interfaces, portable test equipment.
- Smart Home & IoT: Thermostat displays, security keypads, appliance controls.
- Consumer Electronics: Mini gaming devices, smart accessories, hobbyist projects.
Conclusion
The LESSON Smart Display LS0154I06-S-V1 is a practical, well-documented, and easy-to-integrate square display solution. Its combination of an IPS panel, the ubiquitous ST7789P3 SPI interface, clear operating specifications, and detailed mechanical integration notes makes it a reliable and efficient choice for designers aiming to add a quality graphical interface to compact and power-sensitive products.
