The Forgotten Art of Projection Clocks: Uncovering the History and Hackability of a Unique Time-Telling Device

When we think of modern time-telling devices, our minds often turn to smartphones, smartwatches, or traditional clocks on walls or wrists. However, have you ever wondered what time it is when you can't see? This problem has been solved by a peculiar yet ingenious device known as the projection clock. Also referred to as "ceiling clocks" or "night clocks," these devices project a digital display onto a ceiling or wall using a light source and condenser lens, allowing users to tell the time without needing to get up or wear glasses.

The concept of projection clocks dates back to 1909, when UK patent holder Roger Russel designed an analog clock face that projected onto a ceiling using lightbulbs. Although his website is no longer available, the Wayback Machine provides a glimpse into the past, showcasing a similar device at the British Museum. Fast-forwarding to 1938, Leendert Prins filed for a patent on a similar projection clock, which has been nicknamed "ceiling clocks" or "night clocks." These devices often feature a regular clock face alongside a method to project the time.

The modern era of projection clocks employs more advanced technologies, such as LEDs or LCDs with halogen backlights. The process involves shining light through a condenser lens, which then travels through the LCD or translucent clock face before being expanded by a projector lens. This principle is not unique to clocks; we can see similar devices projecting weather forecasts or other images.

While we couldn't find extensive information on the history of projection clocks beyond Roger's defunct website, enthusiasts have already begun exploring and reverse-engineering these devices. Soudnmisen and svetnovinek.cz provide detailed tutorials and videos that reveal how to build a simple projection clock using an LCD or analog clock.

One of the most appealing aspects of projection clocks is their potential as homebrew projects. Users can get creative with various materials, such as mirrors, LEDs, or VFDs, to create unique time-telling displays. As demonstrated by OSO POLAR MOVIES in a video showcasing an analog clock shining light onto it, this hack may not be the most conventional approach but is certainly innovative.

For those interested in exploring further, we've compiled some ideas for creating your own projection clock:

  • LCD Projection Clock: Utilize an LCD module and a projector lens to display the time on a ceiling or wall.
  • Analog Mirror Display: Remove numbers and marks from a mirror, then attach normal clock hands to create a unique display. Reverse the clock movement for an interesting effect.
  • Laser and Galvo Projector: Use a laser and galvanometric (galvo) system to project the time onto the ceiling.
  • Tiny CRT Projection Clock: Repurpose an old CRT display to create a compact projection clock.

What's your take on the projection clock concept? Share your plans and creations with us in the comments below. We'd love to see what innovative ideas our readers come up with!

In conclusion, while not as widely recognized as other time-telling devices, projection clocks represent an intriguing example of modern engineering meeting traditional design principles. By exploring their history and hackability, we can gain a deeper appreciation for the ingenuity behind these devices.