The LG CX does not differ from its predecessor in terms of picture quality. Due to the OLED construction it has an equally excellent picture and there is no real difference. However, the CX has the Black Frame Insertion feature at 120Hz. This allows a reduction of the already very slight motion blur even at a refresh rateHertz is the derived SI-unit of frequency with 1Hz=1/s – When talking about TVs this means how many different pictures a TV can display in one second. of 120Hz. The CX’s built-in speakers are slightly better and the sound is a little rounder – but there’s no DTSMulti-channel-sound-system (Surround Sound) competing with Dolby Digital anymore. But besides the new Alpha 9 Gen 3 image processor, which is now also supposed to optimize the sound. The CX also supports Dolby Vision IQDynamic HDR-format with a color depth of up to 12 Bits and Mastering of up to 10,000 Nits, which can adapt to the ambient brightness, which allows the brightness of HDRHigh Dynamic Range – image/video with more dynamic range (contrast range) content to be automatically adjusted to the ambient brightness. In addition to 55, 65 and 77 inches, the CX is also available in a 48 inch version.