DisplayPort vs HDMI

DisplayPort vs HDMI

Recommendation ITU-R BT.709 defined the color and brightness ranges of broadcast video and television displays based

SDR
HDR10
HLG

SBTM source based tone mapping

Source-Based Tone Mapping (SBTM) enables the source to adapt to the specific capabilities of the display. eliminates need for manual optimization by user.

doesnt replace HDR, HDR10 and HSL, just adds an abstraction layer to auto adjust source to display.

any hdmi cable is compatible with sbtm
ultr high speed hdmi cable gives best experience
sbtm can be added to some deevices via firmware upgrade

HDMI versions (standards):

• HDMI 1.4: Supports up to 4K (4,096 by 2,160) at 24Hz, 4K (3,840 by 2,160) at 30Hz, or 1080p at 120Hz.
• HDMI 2.0: Supports up to 4K at 60Hz, and later versions (HDMI 2.0a and 2.0b) include support for HDR.
• HDMI 2.1: Supports up to 10K resolution at 120Hz, as well as improved HDR with dynamic metadata and enhanced Audio Return Channel (eARC) which allows sending Dolby Atmos and DTS:X audio from the display to a receiver. HDMI 2.1 includes variable refresh rate like FreeSync, though some HDMI 2.0 monitors also support the feature. A newer version (HDMI 2.1a) adds Source-Based Tone Mapping(Opens in a new window) (SBTM).

  DisplayPort advandatges over HDMI:

• supports AMD’s FreeSync and Nvidia’s G-Sync= tear-free gaming experience no matter which brand of card you use (as long as your monitor supports the technology).
• drive multiple monitors from one display port vs multiple HDMI
  laptops can send display port signal over USB C port (displayport support USBc natively= no signal conversion necessary)
• DisplayPort is open standard. when you buy hdmi you pay extra for licensing fees.

In today’s environment, not all displays have the same HDR capability; some have different ranges of color and brightness levels than others. This is fine when HDR video such as HDR10 and HLG are sent, because the television will typically map HDR content beyond the display’s capabilities to the brightness and color ranges available.

But sometimes, a source device needs to combine different types of content (HDR, SDR, dynamic HDR, graphics) together at the same time. For example, when you view a menu of video thumbnails from a streaming video service, some of the thumbnails might be HDR and others might be SDR, and the menu is rendered using graphics.

To optimize the quality of the combined content, processing is needed in the Source device that cannot be performed inside the display.