1.28-inch 240x240 resolution circular 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 circular 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: With a diameter of 1.28 inches (about 32.5 mm), the circular design is ideal for products that require a unique appearance.
Resolution: 240x240 pixels, providing clear and delicate text and image display, suitable for menu navigation, icons and small-scale graphic content.
Interface Type: Most modules use the SPI (Serial Peripheral Interface) interface, which is a synchronous serial communication protocol that allows efficient data transmission between microcontrollers and peripheral devices. In addition, there are also cases where the UART protocol is used.
Display technology: Some modules use IPS (In-Plane Switching) screen technology, which ensures a wide viewing angle and excellent color reproduction, so that you can get a good visual experience when watching from different angles. IPS technology also brings higher contrast and more vivid colors.
Color depth: Supports 65K colors (16-bit color depth), which can display rich colors for vivid and realistic image effects.
Module features
Built-in driver chip: Most of these modules are equipped with a dedicated LCD driver chip, such as GC9A01, which simplifies hardware design and reduces the need for external components. For example, some modules embed the GC9A01 driver and use the SPI bus for communication.
Backlight control: With LED backlight, users can adjust the brightness according to ambient lighting conditions to optimize visibility and power consumption. The backlight life of some modules can reach more than 20,000 hours.
Touch function (optional): Some models 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 machines3
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 very 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, text, 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.
