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HDMI – A brief update with HDMI2.1

HDMI – A common interface that rules home cinema
equipment for about 15 years now. While VGA with it’s
analogue signal was rather unreliable and DVI couldn’t
get past certain resolutions, HDMI made it’s way.

Together with DisplayPort, there are now two major interfaces to transmit video and audio. HDMI also is prepared to transfer Ethernet signals in order to allow basic networking (i.e. for display synchronizaton or the daisy-chained broadcast of video data between single screens.

DisplayPort however is limited to 4K with the actual 1.4 definition. Mostly used with computer displays, this might be sufficient but there are already 8K displays announced and even with 2 DP lines, there might be only a 30Hz refresh rate for 8K.

So either Displayport is upgrading the bandwidth with a new specification level or HDMI2.1 might be the solution…

Display resolutions supported

Video Format HDMI Version / Maximum Data Rate
Standard Video****
HDMI Version / Maximum Data Rate
HDR Video*****
Shorthand Resolution Refresh
Rate (Hz)
Data Rate
Required
1.0–1.1 1.2–1.2a 1.3–1.4b 2.0–2.0b 2.1 2.0a–2.0b 2.1
3.96 Gbit/s 3.96 Gbit/s 8.16 Gbit/s 14.4 Gbit/s 42.6 Gbit/s 14.4 Gbit/s 42.6 Gbit/s
720p 1280 × 720 30 720 Mbit/s Yes Yes Yes Yes Yes No No
60 1.45 Gbit/s Yes Yes Yes Yes Yes No No
120 2.99 Gbit/s No Yes Yes Yes Yes No No
1080p 1920 × 1080 30 1.58 Gbit/s Yes Yes Yes Yes Yes No No
60 3.20 Gbit/s Yes Yes Yes Yes Yes Yes Yes
120 6.59 Gbit/s No No Yes Yes Yes Yes Yes
144 8.00 Gbit/s No No Yes Yes Yes Yes Yes
240 14.00 Gbit/s No No 4:2:0* Yes Yes 4:2:0* Yes
1440p 2560 × 1440 30 2.78 Gbit/s No Yes Yes Yes Yes No No
60 5.63 Gbit/s No No Yes Yes Yes Yes Yes
75 7.09 Gbit/s No No Yes Yes Yes Yes Yes
120 11.59 Gbit/s No No 4:2:2** Yes Yes 4:2:2** Yes
144 14.08 Gbit/s No No 4:2:0* Yes Yes 4:2:2** Yes
240 24.62 Gbit/s No No No 4:2:0* Yes No Yes
4K 3840 × 2160 30 6.18 Gbit/s No No Yes Yes Yes No No
60 12.54 Gbit/s No No 4:2:0* Yes Yes 4:2:2** Yes
75 15.79 Gbit/s No No 4:2:0* 4:2:2** Yes No No
120 25.82 Gbit/s No No No 4:2:0* Yes No Yes
144 31.35 Gbit/s No No No No Yes No Yes
240 54.84 Gbit/s No No No No DSC*** No No
5K 5120 × 2880 30 10.94 Gbit/s No No 4:2:2** Yes Yes Yes Yes
60 22.18 Gbit/s No No No 4:2:0* Yes 4:2:0** Yes
120 45.66 Gbit/s No No No No DSC*** No DSC***
8K 7680 × 4320 30 24.48 Gbit/s No No No 4:2:0* Yes No Yes
60 49.65 Gbit/s No No No No DSC*** No DSC***
120 102.2 Gbit/s No No No No DSC*** No DSC***
Video Format 1.0–1.1 1.2–1.2a 1.3–1.4b 2.0–2.0b 2.1 2.0–2.0b 2.1
HDMI Version HDMI Version

* = Uncompressed 8 bpc (24 bit/px) color depth with RGB or Y′CBCR 4:4:4 color format and CVT-R2 timing are used to calculate these data rates. Uncompressed data rate for RGB images in bits per second is calculated as bits per pixel × pixels per frame × frames per second. Pixels per frame includes blanking intervals as defined by CVT-R2.

** = Possible by using Y′CBCR with 4:2:2 or 4:2:0 subsampling (as lower bandwidth is required for compressed color channel depth)

*** = Possible by using Display Stream Compression (DSC)

**** = Uncompressed 8 bpc (24 bit/px) color depth and RGB or Y′CBCR 4:4:4 color format are assumed on this table except where noted.

***** = HDR10 requires 10 bpc (30 bit/px) color depth, which uses 25% more bandwidth than standard 8 bpc video. Uncompressed 10 bpc color depth and RGB or Y′CBCR 4:4:4 color format are assumed on this table except where noted.

Feature list of HDMI

  HDMI version
1.0 1.1 1.2–1.2a 1.3–1.3a 1.4–1.4b 2.0–2.0b 2.1
Full HD Blu-ray Disc and HD DVD video* Yes Yes Yes Yes Yes Yes Yes
Consumer Electronic Control (CEC)** Yes Yes Yes Yes Yes Yes Yes
DVD-Audio No Yes Yes Yes Yes Yes Yes
Super Audio CD (DSD)*** No No Yes Yes Yes Yes Yes
Auto lip-sync No No No Yes Yes Yes Yes
Dolby TrueHD / DTS-HD Master Audio bitstream capable No No No Yes Yes Yes Yes
Updated list of CEC commands**** No No No Yes Yes Yes Yes
3D video No No No No Yes Yes Yes
Ethernet channel (100 Mbit/s) No No No No Yes Yes Yes
Audio return channel (ARC) No No No No Yes Yes Yes
4 audio streams No No No No No Yes Yes
2 video streams (Dual View) No No No No No Yes Yes
Perceptual Quantizer (PQ) HDR OETF (SMPTE ST 2084) No No No No No Yes Yes
Hybrid Log-Gamma (HLG) HDR OETF No No No No No Yes Yes
Static HDR metadata (SMPTE ST 2086) No No No No No Yes Yes
Dynamic HDR metadata (SMPTE ST 2094) No No No No No No Yes
Enhanced audio return channel (eARC) No No No No No No Yes
Variable Refresh Rate (VRR) No No No No No No Yes
Quick Media Switching (QMS) No No No No No No Yes
Quick Frame Transport (QFT) No No No No No No Yes
Auto Low Latency Mode (ALLM) No No No No No No Yes
Display Stream Compression (DSC) No No No No No No Yes
  1.0 1.1 1.2–1.2a 1.3–1.3a 1.4–1.4b 2.0–2.0b 2.1
HDMI version

DisplayPort Resolutions

Video Format DisplayPort Version / Maximum Data Rate*
Shorthand Resolution Refresh
Rate (Hz)
Data Rate
Required**
1.0–1.1a 1.2–1.2a 1.3 1.4
8.64 Gbit/s
(HBR)
17.28 Gbit/s
(HBR2)
25.92 Gbit/s
(HBR3)
25.92 Gbit/s
(HBR3)
1080p 1920 × 1080 30 1.58 Gbit/s Yes Yes Yes Yes
60 3.20 Gbit/s Yes Yes Yes Yes
120 6.59 Gbit/s Yes Yes Yes Yes
144 8.00 Gbit/s Yes Yes Yes Yes
240 14.00 Gbit/s No Yes Yes Yes
1440p 2560 × 1440 30 2.78 Gbit/s Yes Yes Yes Yes
60 5.63 Gbit/s Yes Yes Yes Yes
75 7.09 Gbit/s Yes Yes Yes Yes
120 11.59 Gbit/s No Yes Yes Yes
144 14.08 Gbit/s No Yes Yes Yes
165 16.30 Gbit/s No Yes Yes Yes
240 24.62 Gbit/s No 4:2:2*** Yes Yes
4K 3840 × 2160 30 6.18 Gbit/s Yes Yes Yes Yes
60 12.54 Gbit/s No Yes Yes Yes
75 15.79 Gbit/s No Yes Yes Yes
120 25.82 Gbit/s No 4:2:2*** Yes Yes
144 31.35 Gbit/s No No 4:2:2*** DSC****
240 54.84 Gbit/s No No 4:2:0*** DSC****
5K 5120 × 2880 30 10.94 Gbit/s No Yes Yes Yes
60 22.18 Gbit/s No 4:2:2*** Yes Yes
120 45.66 Gbit/s No No 4:2:0*** DSC****
8K 7680 × 4320 30 24.48 Gbit/s No 4:2:2*** Yes Yes
60 49.65 Gbit/s No No 4:2:0*** DSC
  1.0–1.1a 1.2–1.2a 1.3 1.4
DisplayPort Version

* = Only a portion of DisplayPort’s bandwidth is used for carrying video data. DisplayPort uses 8b/10b encoding, which means that 80% of the bits transmitted across the link represent data, and the other 20% is used for encoding purposes. The maximum bandwidth of DisplayPort (10.8, 21.6, or 32.4 Gbit/s) therefore transports video data at a rate of 8.64, 17.28, or 25.92 Gbit/s.

** = Uncompressed 8 bpc (24 bit/px) color depth with RGB or YCBCR 4:4:4 color format and CVT-R2 timing are used to calculate these data rates. Uncompressed data rate for RGB images in bits per second is calculated as bits per pixel × pixels per frame × frames per second. Pixels per frame includes blanking intervals as defined by CVT-R2.

*** = Possible using YCBCR format with either 4:2:2 or 4:2:0 chroma subsampling as noted. 4:2:2 subsampling is only supported by DisplayPort 1.2 and above. 4:2:0 subsampling is only supported by DisplayPort 1.3 and above.

**** = Possible using Display Stream Compression (DSC), only supported by DisplayPort 1.4


July 13, 2018 Netspark - 1586 posts - Member since: May 9th, 2011 No Comments »

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