Compare DisplayPort 1.2 vs DisplayPort 1.4

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DisplayPort 1.4
The most recent version of the DisplayPort standard that has been published by VESA is 1.4. This is the first major update since version 1.3(2014). This is the first version to take advantage of VESA’s Display Stream Compression (DSC) . DSC version 1.2 transport enables up to 3:1 compression ratio and has been found to be visually lossless.

In DP 1.4 the use of video transport compression enhances the ability to take advantage of the USB Type-C connector, enabling both high-definition video and SuperSpeed USB, while also facilitating High Dynamic Range (HDR) and 8K video across the DisplayPort or USB-C connector. Examples of increased display resolution with the new standard include 8Kp60Hz HDR deep color and 4Kp120Hz HDR deep color.

Other key new features include
Forward Error Correction – FEC addresses the transport error resiliency needed for compressed video transport to external displays.
HDR metadata transport, inherent in the DisplayPort standard, provides support that is useful for DP to HDMI 2.0a protocol conversion. It also provides a flexible metadata packet transport for future dynamic HDR standards.
Expanded audio transport – This spec extension covers capabilities such as 32 audio channels, 1536kHz sample rate, and inclusion of all known audio formats.

HDMI 2.1
The most recent update of the HDMI specification is version 2.1. It supports a range of higher video resolutions and refresh rates including 8K60 and 4K120, and resolutions all the way up to 10K. Significantly, dynamic HDR formats are also supported, and bandwidth capability is increased up to 48Gbps.

To facilitate the 48Gbps bandwidth is the new Ultra-High-Speed HDMI Cable. This ensures high-bandwidth capability is delivered including uncompressed 8K video with HDR. The cable features low electro-magnetic interference (EMI) and reduces interference with nearby wireless devices. The cable is backwards compatible and can be used with the existing installed base of HDMI devices.

HDMI Specification 2.1 highlights include
Support for higher video resolutions and faster refresh rates including 8K60Hz and 4K120Hz for “immersive viewing and smooth fast-action detail”. There is also support for resolutions up to 10K for future use in commercial AV and specialty applications.

Supported resolutions and frame rates:
4K  @50/60
4K  @100/120
5K  @50/60
5K  @100/120
8K  @50/60
8K  @100/120
10K @50/60
10K @100/120

Dynamic HDR support ensures the transference of proper values on a scene-by-scene or even a frame-by-frame basis for depth, detail, brightness, contrast and wider color gamuts including BT.2020 with 10, 12, and 16 bits per color component.
The Ultra-High-Speed HDMI Cable supports 48G bandwidth for uncompressed video and features low EMI in the process. The cable is also backwards compatible and can be used with existing HDMI devices. Cable length depends on the cable manufacturer. It is likely the maximum lengths for passive cables will be approximately 2 to 3 meters.
Compression: The specification supports both uncompressed and compressed modes. Manufacturers can implement either or both modes. The specification incorporates VESA DSC 1.2a link compression, which is a visually lossless compression scheme. VESA DSC 1.2a also can be used to obtain higher resolutions than 8K60/4:2:0/10-bit color, such as 8K60 RGB, 8K120 and even 10K120. VESA DSC 1.2a also supports 4Kp50/60 with the benefit of enabling operation at much lower link rates.

The designations are:
4K120A – supports uncompressed mode
4K120B – supports compressed mode
4K120AB – supports both
8K60A – supports uncompressed mode
8K60B – supports compressed mode
8K60AB – supports both

Enhanced refresh rate supporting includes:
1. Variable Refresh Rate (VRR) reduces or eliminates lag, stutter and frame tearing
2. Quick Media Switching (QMS) eliminates the delay that can result in blank screens before content is displayed.
3. Quick Frame Transport (QFT) reduces latency for smoother no-lag gaming, and real-time interactive virtual reality.
4. Auto Low Latency Mode (ALLM) allows the ideal latency setting to automatically be set allowing for smooth, lag-free and uninterrupted viewing and interactivity.
In terms of audio, eARC ensures full compatibility between audio devices and upcoming HDMI 2.1 products. It simplifies connectivity, ease of use, and supports the most advanced audio formats to provide the highest audio quality.
Version 2.1 of the HDMI Specification is backward compatible with earlier versions of the specification and is available to all HDMI 2.0 adopters.

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