The Liquid Retina Display is made using a Liquid Crystal Display (LCD), a standard type of screen found in computer monitors, laptop screens, smartphones, tablets, and other devices for many years. It's a tried and true technology, but also an older technology.
How Is a Liquid Retina Display Different From a Super Retina Display?
Screen Technology: Liquid Retina Display screens are made using the older LCD technology rather than the newer OLED used in Super Retina XDR and HD displays.
Pixel Density: Liquid Retina Displays have a pixel density of either 326 pixels per inch (ppi) or 264 ppi (on iPads). Both the Super Retina HD and XDR displays sport 458 ppi pixel density.
Contrast Ratio: The contrast ratio on Liquid Retina Displays is 1400:1. A Super Retina HD display has a 1,000,000:1 ratio, while a Super Retina XDR has a 2,000,000:1 ratio. Contrast ratio effects the range of colors the screen can display and the depth of its blacks.
Brightness: The maximum brightness of a Liquid Retina Display is 625 nits, while a Super Retina XDR maxes out at 800 nits.
Battery Life: This is less easy to quantify, since so many things go into how long batteries last, but OLED screens in the Super Retina HD and XDR screens generally use less power than the LCD screens in the Liquid Retina Display.
iPhone Xr and iPhone 11 (Liquid Retina Display)