Digital clock

digitalcomputer programmingDigital clocks
A digital clock is a type of clock that displays the time digitally (i.e. in numerals or other symbols), as opposed to an analog clock, where the time is indicated by the positions of rotating hands.wikipedia
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Clock

clockstimepiecemechanical clock
A digital clock is a type of clock that displays the time digitally (i.e. in numerals or other symbols), as opposed to an analog clock, where the time is indicated by the positions of rotating hands.
Digital clocks display the time in periodically changing digits on a digital display. A common misconception is that a digital clock is more accurate than an analog wall clock, but the indicator type is separate and apart from the accuracy of the timing source.

Elektronika 7

In the Soviet Union, the 7-segment digital clocks were known as Elektronika 7.
Electronics 7 is a Soviet Russian brand of seven-segment industrial digital clocks with four or eleven seven-segment luminescent digits.

Liquid-crystal display

LCDliquid crystal displayliquid crystal displays
Emulations of analog-style faces often use an LCD screen, and these are also sometimes described as "digital". To represent the time, most digital clocks use a seven-segment LED, VFD, or LCD for each of four digits.
LCDs are available to display arbitrary images (as in a general-purpose computer display) or fixed images with low information content, which can be displayed or hidden, such as preset words, digits, and seven-segment displays, as in a digital clock.

Seven-segment display

7-segment displayseven segment displayseven-segment
To represent the time, most digital clocks use a seven-segment LED, VFD, or LCD for each of four digits.
Seven-segment displays are widely used in digital clocks, electronic meters, basic calculators, and other electronic devices that display numerical information.

Alarm clock

clock radioalarmalarm clocks
This is a particular problem with alarm clocks that have no "battery" backup, because even a very brief power outage during the night usually results in the clock failing to trigger the alarm in the morning.
Digital alarm clocks can make other noises.

Digital data

digitaldigital informationdigitally
A digital clock is a type of clock that displays the time digitally (i.e. in numerals or other symbols), as opposed to an analog clock, where the time is indicated by the positions of rotating hands. Most digital clocks display the hour of the day in 24-hour format; in the United States and a few other countries, a commonly-used hour sequence option is 12-hour format (with some indication of AM or PM).

Cortébert (watch manufacturer)

Cortébert
By 1885 Pallweber mechanism was already on the market in pocket watches by Cortébert and IWC; arguably contributing to the subsequent rise and commercial success of IWC.

International Watch Company

IWCIWC Schaffhausen
By 1885 Pallweber mechanism was already on the market in pocket watches by Cortébert and IWC; arguably contributing to the subsequent rise and commercial success of IWC.

Chronoswiss

The principles of Pallweber jump-hour movement had appeared in wristwatches by the 1920s (Cortébert) and are still used today (Chronoswiss Digiteur).

Aktiengesellschaft für Uhrenfabrikation Lenzkirch

The German factory Aktiengesellschaft für Uhrenfabrikation Lenzkirch made such digital clocks in 1893 and 1894.

Hamilton Watch Company

HamiltonBurenHamilton 500
Called the Pulsar, and produced by the Hamilton Watch Company, this watch was hinted at two years prior when the same company created a prototype digital watch for Kubrick's 2001: A Space Odyssey.

2001: A Space Odyssey

2001 A Space Odyssey20012001: Space Odyssey
Called the Pulsar, and produced by the Hamilton Watch Company, this watch was hinted at two years prior when the same company created a prototype digital watch for Kubrick's 2001: A Space Odyssey.

Soviet Union

SovietUSSRSoviets
In the Soviet Union, the 7-segment digital clocks were known as Elektronika 7.

Hertz

MHzkHzHz
Digital clocks typically use the 50 or 60 hertz oscillation of AC power or a 32,768 hertz crystal oscillator as in a quartz clock to keep time.

AC power

reactive powerACreal power
Digital clocks typically use the 50 or 60 hertz oscillation of AC power or a 32,768 hertz crystal oscillator as in a quartz clock to keep time.

Crystal oscillator

crystalquartz oscillatorquartz crystal
Digital clocks typically use the 50 or 60 hertz oscillation of AC power or a 32,768 hertz crystal oscillator as in a quartz clock to keep time.

Quartz clock

quartz watchquartzquartz movement
Digital clocks typically use the 50 or 60 hertz oscillation of AC power or a 32,768 hertz crystal oscillator as in a quartz clock to keep time.

24-hour clock

24-hour24-hour notation24-hour format
Most digital clocks display the hour of the day in 24-hour format; in the United States and a few other countries, a commonly-used hour sequence option is 12-hour format (with some indication of AM or PM).

12-hour clock

p.m.a.m.pm
Most digital clocks display the hour of the day in 24-hour format; in the United States and a few other countries, a commonly-used hour sequence option is 12-hour format (with some indication of AM or PM).

Watch

wristwatchwatchesdigital watch
Some timepieces, such as many digital watches, can be switched between 12-hour and 24-hour modes.

Light-emitting diode

LEDLEDslight emitting diodes
To represent the time, most digital clocks use a seven-segment LED, VFD, or LCD for each of four digits.

Vacuum fluorescent display

VFDvacuum fluorescentdisplay
To represent the time, most digital clocks use a seven-segment LED, VFD, or LCD for each of four digits.

Numerical digit

digitdigitsdecimal digit
To represent the time, most digital clocks use a seven-segment LED, VFD, or LCD for each of four digits.

Power outage

blackoutpower failureblackouts
This is a particular problem with alarm clocks that have no "battery" backup, because even a very brief power outage during the night usually results in the clock failing to trigger the alarm in the morning.

Electric battery

batterybatteriesbattery-powered
To reduce the problem, many devices designed to operate on household electricity incorporate a battery backup to maintain the time during power outages and during times of disconnection from the power supply.