当HDMI2.1的带宽已经反超了DP1.4和雷电3，DP1.5奋力追赶中
目前市场的主流接口，HDMI,Displayport,Thunderbolt,由于各属不同阵营，所以代表的利益关系不一样，电视，游戏机，光碟机一般只有HDMI没有Displayport,苹果的很多设备基本只有Displayport和Thunderbolt，PC电脑端基本上同时支持HDMI和Displayport,偶尔高端机搞个兼容Thunderbolt，由于标准和应用规范协议不一样，没有握手协议的就带来很多兼容问题，所以现在的扩展坞才越来越火，希望未来大家伙统一标准，但是有利有弊，一旦标准统一，是不是大家伙就不会如现在这样你追我赶的追求更高的品质要求和研发动力呢，鬼知道，今天我们聊聊，当HDMI2.1的带宽已经反超了DP1.4和雷电3，DP1.5奋力追赶中..........
■HDMI2.1的带宽: 48Gbps
■Thunderbolt 3的带宽: 40 Gbps
■Displayport1.4的带宽: 32Gbps
■Displayport1.5的带宽: 64.8Gbps
☞HDMI2.1的带宽已经反超了displayport1.4和雷电3
☞下一代Displayport（应该是叫displayport1.5）奋力追赶，预计达到64.8Gbps.
Displayport Next version
According to a roadmap published by VESA in September 2016, a new version of DisplayPort was intended to be launched in "early 2017". It would have improved the link rate from 8.1 to 10.0 Gbit/s, a 24% increase. This would have increased the total bandwidth from 32.4 Gbit/s to 40.0 Gbit/s. It is unclear whether or not the new version would have continued using the 8b/10b scheme for transport encoding like previous versions, but if so, the maximum data rate for video would have been 32.0 Gbit/s.
However, no new version was released in 2017, likely delayed to make further improvements after the HDMI Forum announced in January 2017 that their next standard (HDMI 2.1) would offer up to 48 Gbit/s of bandwidth. According to a press release on 3 January 2018, "VESA is also currently engaged with its members in the development of the next DisplayPort standard generation, with plans to increase the data rate enabled by DisplayPort by two-fold and beyond. VESA plans to publish this update within the next 18 months."This implies a bandwidth of around 64.8 Gbit/s for the next version of DisplayPort. Assuming 8b/10b encoding, this would give a data rate of 51.84 Gbit/s.
This should allow for uncompressed RGB / YCBCR 4:4:4 video formats as high as:
8K (7680 × 4320) @ 60 Hz 8 bpc (24 bit/px) or 50 Hz 10 bpc (30 bit/px)
5K (5120 × 2880) @ 120 Hz 8 bpc or 100 Hz 10 bpc
4K (3840 × 2160) @ 200 Hz 8 bpc or 180 Hz 10 bpc
Higher resolutions/refresh rates should also be possible through the use of DSC (compression) or chroma subsampling (YCBCR 4:2:2 or 4:2:0). Higher uncompressed formats may also be possible if the new version replaces 8b/10b encoding with a more efficient encoding method.
Cables and connnectors
Cable length 线材长度定义
The DisplayPort standard does not specify any maximum length for cables, though the DisplayPort 1.2 standard does set a minimum requirement that all cables up to 2 meters in length must support HBR2 speeds (21.6 Gbit/s), and all cables of any length must support RBR speeds (6.48 Gbit/s). Cables greater than 2 meters may or may not support HBR/HBR2 speeds, and cables of any length may or may not support HBR3 speeds.
显示接口标准没有指定任何电缆的最大长度,虽然显示端口1.2标准并设置最低要求所有电缆2米的长度必须支持HBR2速度(21.6 Gbit / s),和所有的电缆长度必须支持RBR速度(6.48 Gbit / s),电缆大于2米可能会或可能不会支持HBR2速度,和电缆的长度可能会或可能不会支持HBR3速度.以下有代表的速度计算方式
The total bandwidth of the main link in a standard 4-lane connection is the aggregate of all lanes:
RBR: 4 × 1.62 Gbit/s = 6.48 Gbit/s bandwidth (data rate of 5.184 Gbit/s or 648 MB/s with 8b/10b encoding)
HBR: 4 × 2.70 Gbit/s = 10.80 Gbit/s bandwidth (data rate of 8.64 Gbit/s or 1.08 GB/s)
HBR2: 4 × 5.40 Gbit/s = 21.60 Gbit/s bandwidth (data rate of 17.28 Gbit/s or 2.16 GB/s)
HBR3: 4 × 8.10 Gbit/s = 32.40 Gbit/s bandwidth (data rate of 25.92 Gbit/s or 3.24 GB/s)
目前使用DP接口的电脑品牌
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