Vivian got an old broken CRT monitor from a college’s recycling cage and turned it into a helmet with a working RGB LED display. If you want to make a TV head without the electronics, this method should still work if you ignore all the electronic parts.
The screen is made of 300 individually-addressable RGB LEDs, specifically WS2812Bs (NeoPixels). I made the LED matrix from a single 5-meter, 60 LEDs/meter strip by cutting it into 15 strips of 20 pixels each and soldering them together. People often ask me how I can see through the helmet; the answer is that I designed the matrix to have empty space between the strips.
An Adafruit Circuit Playground Express microcontroller controls the lights.
See the full details in the guide here.