ASRock announced a 13.3 Side Panel Kit, which is a 13.3-inch liquid crystal display that supports eDP connection. A liquid crystal panel kit that can be used to mount a screen on the side of a PC case and use it as a secondary screen.
Some motherboards with an eDP interface, like the B650E PG-ITX WiFi, can be connected to a PC case with a transparent side panel, like tempered glass, with just one cable. It is likely that the sub-screen built into the PC case is used to show chat messages and play game strategy videos. By the way, when the idea was first shown at a product presentation, it was said that it was based on the "side panel display," which is popular with modders in other countries.
The display is an anti-glare IPS liquid crystal with a resolution of 1,920 x 1,080 dots, a refresh rate of 60Hz, a maximum brightness of 300cd/m2, and a contrast ratio of 800:1.