L'Antre du Tryphon
TIL311 are single-digits LED hexadecimal displays with an internal four-bit latch and decoder along with the LED drivers. They come in 14 pins, dual-in-line-package. The characters are made of an 4 x 7 array of red LEDs.
I bought some from AliExpress. I wrote a test program using an Arduino to test them. Each 16 digits, both decimal points along with the latch and blanking functions are tested.
The source code can be found at https://github.com/ctheroux/hardware. A video of the program behavior can be found at https://youtu.be/kFy0W6MrDVs.
It is important to note the resistors ( above 220 ohms) are required for the decimal points.