Twenty-One Segments: It contains three groups of seven segments, each capable of displaying the digits 0 through 9 by illuminating in specific patterns. Decimal points may also be included to display decimal numbers or improve readability.
Triple Digit Display: Capable of showing three digits at once, it significantly enhances the capability to convey more complex numerical information without the need for multiple separate modules.
LED or LCD Options: The segments can be made using LEDs for their brightness and visibility in various lighting conditions, or LCDs for scenarios where energy efficiency is paramount.
Common Anode or Common Cathode Configuration: Similar to its 1-digit and 2-digit counterparts, the 3-digit version can be configured with either all anodes connected together or all cathodes connected together for each digit, facilitating different design requirements.
Multiplexing Support: Efficient control over the 3-digit display, particularly when managing pin usage from microcontrollers, is often achieved through multiplexing. This technique allows the shared control of segment lines across the digits while selectively activating each digit in a rapid sequence, creating the illusion of a static display.
Space-Efficient Design: Integrating three digits into one unit saves valuable space on printed circuit boards (PCBs) and simplifies design and assembly efforts.