LED Matrix Array in a Display frame. The Matrix does not have any diffusing added to it, you can add your own or some paper sheets or make your own.

LED Matrix: https://www.aliexpress.com/item/4000544584524.html

Driven by a ESP32-C3 mini: https://www.aliexpress.com/i/1005005319963906.html

The ESP32 and Power Connector will be glued to the back of the LED Matrix.