1.28-inch 240x240 resolution LCD modules are small-size display components designed for compact devices. They not only have high resolution and wide viewing angle, but are also suitable for specific application scenarios due to their round or square design. Such modules usually integrate LCD panels, driver integrated circuits, FPCs (flexible printed circuits) and backlight units, making them ideal for smart watches, fitness trackers and other portable or wearable electronic products.
Technical Specifications
Screen size: 1.28 inches (about 32.5 mm) in diameter (if round) or diagonal (if square), suitable for applications that require miniaturization but maintain a certain viewing area.
Resolution: 240x240 pixels, providing clear and delicate text and image display, especially suitable for menu navigation, icons and small-scale graphic content.
Interface type: Usually uses SPI (Serial Peripheral Interface) interface, which is a synchronous serial communication protocol that allows efficient data transmission between microcontrollers and peripheral devices. Other interfaces such as I2C or parallel interfaces may also be supported.
Display technology: It can be TFT-LCD (Thin Film Transistor Liquid Crystal Display), and some models may use IPS (In-Plane Switching) technology to ensure wide viewing angles and excellent color reproduction.
Color Depth: Most support 65K colors (16-bit color depth), which can provide rich color performance for vivid and realistic image effects.
Built-in driver chip: Equipped with a dedicated LCD driver chip, such as ST7789 or GC9A01, it simplifies hardware design and reduces the need for external components.
Backlight control: With LED backlight, users can adjust the brightness according to ambient lighting conditions to optimize visibility and power consumption.
Module Features
Wide viewing angle: Thanks to IPS technology, this module provides a wide viewing angle of nearly 180 degrees, which can maintain a clear and color-accurate display from any angle.
Touch function (optional): Some modules may also integrate capacitive or resistive touch screens, increasing the possibility of user interaction.
Application Areas
This type of module is widely used in many fields, including but not limited to:
Smart watches and other wearable devices
Small medical instruments
Internet of Things (IoT) devices
Home automation control panels
Portable payment terminals such as mobile POS machines
Development considerations
Power management: Considering the issues of portability and battery life, an effective power management system is essential to extend the working time of the device.
Development tools and support: It is important to choose products with good documentation and technical support. Sample code, library functions and development boards provided by manufacturers can help speed up the development process.
Graphics library: To simplify the development process, you can use existing graphics libraries (such as LVGL, uGFX, etc.), which provide functions such as drawing lines, rectangles, texts, and even support more complex GUI elements.
Physical connection: Make sure that the main control board has enough pins to connect the SPI interface, and pay attention to the impact of signal line length on signal integrity.
Actual case
For example, Waveshare provides a 1.28-inch round TFT LCD module with a resolution of 240x240, using the ST7789 driver IC, supporting 65K colors, suitable for smart watches and other small devices. This module has good color performance and wide viewing angle, making it an ideal choice for many applications.
Another product is a 1.28-inch circular TFT IPS LCD module with a resolution of 240x240, also using the ST7789 driver IC, supporting 65K colors, and with LED backlight. This module is ideal for applications that require high resolution and wide viewing angle.
