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2. Digital clock - Wikipedia

   en.wikipedia.org/wiki/Digital_clock

   A digital clock's display changing numbers. To represent time, most digital clocks use a seven-segment LED, VFD, or LCD for each of the four digits. They generally also include other elements to indicate whether the time is AM or PM, whether or not an alarm is set, and so on. Older digital clocks used numbers painted on wheels, or a split-flap ...

3. Nixie tube - Wikipedia

   en.wikipedia.org/wiki/Nixie_tube

   Nixie tube. A Nixie tube (English: / ˈnɪk.siː / NIK-see), or cold cathode display, [1] is an electronic device used for displaying numerals or other information using glow discharge. The glass tube contains a wire-mesh anode and multiple cathodes, shaped like numerals or other symbols. Applying power to one cathode surrounds it with an ...

4. Split-flap display - Wikipedia

   en.wikipedia.org/wiki/Split-flap_display

   Video of the main departure board Praha-Smíchov station, Czech Republic (2012). This Signaltron was manufactured by Pragotron Schematic of a split-flap display in a digital clock display An animation of how a split-flap display works Flap departure board at Gare du Nord, Paris (2007) Section of a split-flap display board at Frankfurt (Main) Hauptbahnhof (2005) Enlarged inner workings of a ...

5. Seven-segment display - Wikipedia

   en.wikipedia.org/wiki/Seven-segment_display

   Seven-segment display. A typical 7-segment LED display component, with decimal point in a wide DIP -10 package. A seven-segment display is a form of electronic display device for displaying decimal numerals that is an alternative to the more complex dot matrix displays. Seven-segment displays are widely used in digital clocks, electronic meters ...

6. Liquid-crystal display - Wikipedia

   en.wikipedia.org/wiki/Liquid-crystal_display

   A liquid-crystal display (LCD) is a flat-panel display or other electronically modulated optical device that uses the light-modulating properties of liquid crystals combined with polarizers. Liquid crystals do not emit light directly [ 1 ] but instead use a backlight or reflector to produce images in color or monochrome.

7. Digital on-screen graphic - Wikipedia

   en.wikipedia.org/wiki/Digital_on-screen_graphic

   A digital on-screen graphic, digitally originated graphic (DOG, bug, [1] network bug, or screenbug) is a watermark-like station logo that most television broadcasters overlay over a portion of the screen area of their programs to identify the channel. They are thus a form of permanent visual station identification, increasing brand recognition ...