Basically, DisplayPort supports the needs of the computer industry.

Q. Why are computers starting to get rid of the HDMI port and replace it with the DisplayPort?

answered by Dave Haynie (Hardware Systems Engineer (Rajant + Commodore-Amiga + 20 years in startups)

A big part of it is “ours” vs “theirs” and a bit of technology advance.

The PC Industry moved first, with the DVI (Digital Visual Interface), the first mainstream replacement for VGA in the industry, and a transitional form. DVI cables could carry analog, with a cleaner signal than VGA, and they could carry digital. DVI was introduced in 1999. DVI single link supports video data rates to 3.96 Gb/s, while dual link can support up to 7.92 Gb/s.

The HDMI (High-Definition Multimedia Interface) was established starting in 2002 as a consumer electronics industry format designed intentionally to be backwards compatible with DVI. It wasn’t limited to DVI compatibility from get-go, supporting video-standard color formats in addition to RGB. For years, the computer industry showed no interest in the HDMI interface. However, over those years, the HDMI interface was enhanced to 1.3 (8.16 Gb/s single link), 2.0 (14.4 Gb/s), and 2.1 (42.6 Gb/s), with deep color, 4K and 8K support, etc.

In 2010, not long after HDMI 1.4 was introduced, a number of leading manufacturers, including Intel and AMD, announced they were not planning to support DVI past around 2013, but instead, concentrate on HDMI (for TV connectivity) and DisplayPort (for mainstream monitor support).

In 2006, the VESA group released the initial DisplayPort specs, supporting data rates at 8.64 Gb/s. While it was initially a bit faster than DVI and a match to HDMI, the main advantage of DisplayPort is that, rather than being a digital video stream, it’s a packet-based technology. The packet technology makes DisplayPort extensible, which was used in DisplayPort 1.2 to deliver multi-monitor support over a single DisplayPort. DisplayPort 1.3/1.4 deliver 25.92 Gb/s data rate, as well as including a number of HDMI improvements like Rec. 2020 color space support.

Basically, DisplayPort supports the needs of the computer industry. It’s also supported with a full spec alternate mode over Thunderbolt 2.0 and the Type-C connector (USB, Thunderbolt 3.0), while HDMI over Type-C is only supported to HDMI 1.4. This is again the reality that DisplayPort is a native computer industry spec while HDMI is managed based on CE priorities.

The main point of HDMI remains computer compatibility with televisions. But it’s fairly simple — and cheap — to drive an HDMI input from a DisplayPort to HDMI bridge device.

And finally, there are royalties to pay for HDMI ports, the HDMI logo, etc. DisplayPort is royalty-free. That may not seem like such a big deal, but PC-industry folks, perhaps spoiled by years of Intel developing technologies and then just giving them away, really doesn’t like paying royalties. Apple managed to pretty much kill IEEE1394 (aka Firewire — though “Firewire” is an Apple trademark, which also didn’t help any) by asking $1.00 per port when it was new.

source : Quora

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