Vacuum Fluorescent Display Watch

Vacuum fluorescent displays work kind of like a CRTs where accelerated electrons are bombarded on a layer of phosphor which then emits this typical blue-greenish light. VFDs are driven with much lower voltages compared to CRTs which is why they are often found in small consumer equipment predating the LCD-era.

In order to create free electrons a filament is heated within the VFD, the cathode (at negative, or in our case ground potential). This creates an electron cloud around the filament, which will be accelerated towards any positively charged surface, here the plates of the anode. This on its own works already, but would require a separate pin for each segment on the display to drive it. To reduce the number of inputs, most VFDs are multiplexed with a matrix above each substructure like a 7-segment. Only when the plate and its matrix are at a positive voltage electrons will hit the phosphor surface.

The IVL2-7/5 is controlled with an anode voltage of around 24V for the matrix and plates. The filament is heated with 2.4V AC. The AC is needed to even out the voltage difference between the filament and the anode. If DC is used, the side closer to ground will be at a higher voltage difference (0-24V vs 2.4-24V) and may be brighter than the other side. In practice the difference is hardly noticeable.

Initially I didn't have a datasheet for the display, so I had to resort to trial-and-error testing. The filament pins can easily be found by measuring the resistance between them as it should be in the order of tens of Ohms. All the other pins are either a short or open circuit.
In the end I found the original datasheet, so this wasn't really necessary...

3 More Images

The watch was designed with the following specifications in mind:

• Run (briefly) from a AA alkaline battery
• Compact size
• Wifi & Bluetooth
• Easily programmable

The brain of the watch is an ESP32 (Wroom-32 module) as it can be programmed via Arduino and has build in Wifi/Bluetooth and a very low power sleep mode. To interface with the ESP32 a FTDI USB-Serial converter was used.

The most challenging part of this project was to get the different power supply correctly designed. The VFD needs 24V for its anode and ideally 2.4V AC for the filament. The ESP32 also need its share of 3.3V at more than 240mA when heavily using wireless communications. All that has to be squeezed out of a 1.5V AA alkaline cell.

Early on the 2.4V AC was replaced by just using 3.3V on the filament and modulating the output with an H-bridge to not burn up the filament. It actually can survive 3.3V for a bit, but quickly turns into a light bulb...

The 3.3V is generated using a MP3120 boost converter, that is specifically designed to work with single cell alkaline batteries. It can theoretically go down to 0.8V, but in practice only at very low currents. But it has a built in linear regulator, that allows the use of batteries with higher than 3.3V voltage like 14500 lithium cells.

24V for the VFD comes also from a boost converter MCP1663. This one is less efficient due to the high step-up from 3.3V to 24V. The display also works at lower voltages down to 16V, but loses much of its brightness.

To switch the 24V on the display anodes 2 high-side switching ICs TBD63783A with a 16 bit I2C expander (MCP23017) are used. This can also be done with discrete PNP & NPN transistors, but due to limited board area I opted for the more integrated solution.

The whole design and layout was done with KiCad5.

The PCB were ordered from JLCPCB with black solder mask and gold plating (because why not...). The assembly was done by hand.

Initially the USB-Serial converter didn't work, but after some troubleshooting this was due to mixed up data lines on the USB connector, that were fixed with some bodge wires as seen in the picture above.

The software was written with Arduino using PlatformIO.

The full source code and design files can be found on GitHub:

https://github.com/Pakue95/VFD_Watch

Thanks for reading!