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History
Projection clocks were patented at least twice: once in 1909, and another time in 1940 . Both patents have expired by now, so any company or hobbyist can build projection clocks.
Previously, projection clocks, like other clocks of that period, were universally analog. With the widespread adoption of digital clocks, digital projection clocks have also appeared.
Technology
A projection clock usually needs a backlight, as most clock displays do not radiate their own light. The backlight can use different lighting technologies, from incandescent bulbs to LEDs.
Projection clocks can be divided into two groups: low-brightness and high-brightness. The image created by low-brightness projection clocks can be viewed only in a darkened room, while high-brightness ones create an image that can be viewed even in lighted rooms, but are more power-hungry.
Low-brightness projection clocks
Most modern projection clocks use a red LED-based projector, and also an ordinary LED or LCD display. That is convenient, since these clocks are low-brightness, and the conventional display can be read when the room is not darkened and the image generated by projector is unreadable. Such projection clocks are often integrated into clock radios and home weather stations. Clock radios equipped with projectors are only slightly more expensive.
High-brightness projection clocks
Modern high-brightness projection clocks are in most cases analog, and have a halogen bulb backlight. In most cases they use a set of rotating and fixed transparent discs with hands and a face. Sometimes, an LCD is integrated into this set to combine analog and digital information on the projected image. They are more expensive than low-brightness ones.
Projectors used in projection clocks are similar to other projectors, and use the same optical principles. Most of them use lenses, but some use the principle of shadow theater, vector scanning or raster scanning.
External links
History of projection clocks
A VFD-based homemade projection clock
An LCD-based homemade projection clock
Categories: Clocks | Horology

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