In our days, for 4k or also named UHD (UltraHD) TVs to connect them with other devices are used HDMI
For example. in TVs LG lastly 2014 they're named HDMI (4K@60Hz) DVI IN (HDCP 2.2, ARC, 10Bit, MHL) What are them, which hdmi port to use for 4k, different hdmi ports? And why they have different names than earlier ports which were known like as HDMI (ARC, STB, DVI, MHL). In this article I try to tell about diferents ones from anothers.
HDMI 4k@60Hz/DVI IN, ( in the picture above) and means that in this TV are HDMI standart 2.0. These ports support 4k Video ( 3840 x 2160 pixels ) and frame rate 60 frame per sec, they also support 3D image and these ports are supported by DVI ports. The HDMI ports on the TV support direct connection from the computer from the DVI port. All HDMI 4K ports support connecting devices with HDMI ports without 4K support, to a TV with HDMI 4K ports, you can connect a computer that has a simple HDMI port.
HDMI (HDCP 2.2) This is a copy protection data version 2.2
At first, HDMI HDCP was developed as a protected data to connect devices to transmit high-resolution video. And a time again was developed a protocol 2.2 to provide better protection. And this version of protocol isn't supported by earlier versions of HDMI HDCP. One of the requirements for manufacturers of devices with 4K video support is the installation of ports that support HDCP 2.2.If you have a Blu-Ray player with an HDMI 2.0 port with support for HDCP 2.2, and you want to run a movie on it, your TV must support HDCP 2.2 encryption to watch it.
A picture which shows a cheme of HDCP work
If one of the devices doesn't support HDCP 2.2.
HDMI (ARC) reverse audio channel
This standart make you abble to use only one type of ports without others. So you can connect your loudspeakers and listen all what you want without unnecessary ports
HDMI 10Bit This inscription tell as that picture which are shown by this port have color depth 10 or 12 bit.
It is wonderful, but in television is only 3 colors and 1024 ( 10 bit color depth) shades, so these shades can create more than 1 billion different colours ( Multiply 1024 x 1024 x 1024).
HDMI MHL (Mobile High-Definition Link) In this way, port support USB Data (USB→HDMI). For example, you can share your photos, videos or music from your phone (USB) to your TV (HDMI)
MHL is only one type of HDMI ports which support USB Data