After LEDs and TFTs and OLEDs and liquid crystals, there’s another display technology that doesn’t get a lot of attention. Electroluminescent displays have been around for ages, and there still aren’t a whole lot of applications for them. That might change soon, because Applied Science a.k.a. [Ben Krasnow] figured out an easy way to build EL displays on anything, and created a simple circuit that’s capable of driving video on a remarkable blue phosphor EL display.
For this build, [Ben] is using a specialty product from Lumilor consisting of a copper-ish conductive base layer, a clear dielectric, the ‘lumicolor’ phosphor, and a clear conductive top coat. All of these layers are applied with an airbrush, and the patterns are made with a desktop vinyl cutter. This is an entire system designed to put electroluminescent displays on motorcycle gas tanks and to have doors that go like *this* and glow. That said, the system isn’t very dependent on the substrate, and [Ben] has had successful experiments in creating EL displays on plastic sheets, 3D printed parts, and even paper.
Compared to previous (and ongoing) efforts to create EL displays such as [Fran]’s recreation of the Apollo DSKY, the Lumilor system seems extraordinarily easy and clean. Current efforts as with [Fran]’s example are using a silkscreen process, which is a mess no matter how you look at it and can’t be applied to non-flat surfaces.
But EL displays are more than just putting a few layers of chemicals on a substrate — you need to drive these displays with high-frequency, high-voltage AC. For this, [Ben] designed a multi-channel electroluminescent driver based on the Adafruit Trinket M0, two LT3468 ICs to generate a high voltage, and either a an HV507 or HV513 to drive 8 or 64 channels.
With the ability to create EL displays and drive 64 channels, there really was only one thing to do: a 32×32 display. Even seeing a few lines scan across a 32×32 EL display is magical, but it’s got another trick up its sleeve: it also plays a low-resolution video of Never Gonna Give You Up.
This isn’t a video to be missed, check it out below.