VESA publishes Embedded DisplayPort 1.4a standard →
Beyond higher bandwidth, one of the more interesting features of eDP 1.4a is Display Stream Compression (DSC), a standard developed by VESA and MIPI that—as the name implies—compresses the output video signal. According to VESA, the compression is “visually lossless” (i.e., it is lossy, but your games won’t suddenly look like a hand-me-down JPEG).
“Visually lossless” is a stunningly great bullshit phrase. By that standard, my entire MP3 collection is aurally lossless!
Compression that loses some data but is close enough for the losses not to be perceived by people is the definition of lossy compression, and “lossless” specifically means not that.