macbook pro 13-inch 2019 display covered with horizontal black pinstripes

The retina display of my 13-inch 2019 macbook pro has since yesterday had horizontal black pinstripes with ca 1mm spacing between the stripes covering the entire display. The screen was back to normal for 1 use session since then, but the fault seems to now be permanent. I have tried rebooting, and checked that all software is up to date. Anybody else share the same issue? Any reason why that is, and if there is any self-help to try before taking the computer to an Apple repair shop?