The display quality authority VESA has announced the latest standard against which PC and display OEMs can pit their new devices. DisplayHDR True Black 600 is rated to call for even higher luminance than its predecessors, and is thus pitched as a new badge of excellence in panels made of material such as OLED.
https://www.notebookcheck.net/VESA-unveils-its-new-DisplayHDR-True-Black-600-standard-for-PC-displays-and-monitors.558676.0.html
Good, Laptop monitors need to be improved until you can read one easily in the sun.