Light emitting diode Wikipedia
A light emitting diode (LED) is a semiconductor light source that emits light when current flows through it. Electrons in the semiconductor recombine with electron holes, releasing energy in the form of effect is called electroluminescence. The color of the light (corresponding to the energy of the photons) is determined by the energy required for electrons to cross the band gap
Seven segment display Wikipedia
Seven segment displays may use a liquid crystal display (LCD), a light emitting diode (LED) for each segment, an electrochromic display, or other light generating or controlling techniques such as cold cathode gas discharge (Panaplex), vacuum fluorescent, incandescent filaments (Numitron), and others. For gasoline price totems and other large signs, vane displays made up of electromagnetically
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This is battery level display module based on battery style digital tube LED. The 5 segment LED inside is red light and the frame is green light. 7 segment clock display " digit height LED7SEG039R. LED module p10 led panel 16x32 rgb black chip led display screen for indoor use matrix led pitch10 led board input voltage : 5
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A fun way to make a small display is to use an 8x8 matrix or a 4 digit 7 segment display. Matrices like these are 'multiplexed' so to control all the seven segment LEDs you need 14 pins. That's a lot of pins, and there are driver chips like the MAX7219 that can control a matrix for you but there's a lot of wiring to set up and they take up a