The Watara Supervision is a hidden gem from the past.
Although it is a pretty good handheld console with a decent game library but like many other consoles from the era, it has a horrible dot matrix LCD.
Having previously replaced a similar old LCD of the Mega Duck, a similar handheld console from the same era, I went on a mission to do the same with the Supervision: replace the stock LCD with a modern IPS screen.
This time proved a lot harder though!
The result is far from perfect but certainly acceptable, in my opinion.
Check out the project's GitHub repository for all the details.
Below is a short video demonstrating the end result.
While the video shows a monochrome screen, the mod is capable of running all games in color using configurable color schemes (see project photo).