hdmi2.0 18G的带宽确实是低了点

这几天家里折腾一台17年的大法电视，先是120hz下无法4k，然后开了hdr后各种问题，搜了一下资料，瓶颈在hdmi2.0标准上，4k hdr 60三项满配是不可能了，结果只能阉割HDR的色彩和灰阶。但即使如此，仍然很多问题，比如设置灰阶设为有限之后，235-255灰阶没了，桌面的显示就变的诡异了，有知道要怎么调最合适的吗，电视是9000e

贴一下网上查的资料，看样子明年换代主机还得换电视

4K resolution.
60 frames per second.
4:4:4 chroma subsampling.

This trio has been used in combination for some time as a moniker to signify 18Gbps HDMI support. Simply stating ‘18G’ might have been simpler, but hey that’s another story…

The complication comes when HDR is added. From a menu where 4K is the main dish, and 60fps, 4:4:4 and HDR are the three side options, we can only choose two. The third comes at extra cost of which we can’t yet afford. That’ll come with HDMI 2.1.

Why is it so?

4K60 4:4:4 runs at 17.82Gbps, but only with the default 8-bit BT.709 color. That’s the same color gamut as 720p and 1080i/p. The whole point of HDR is to increase color volume, which it can’t do unless there’s first an increased color gamut. That means stepping up to BT.2020, which in turn means 10- or 12-bit deep color. The HDMI 2.0 spec also calls for a minimum 10-bit color with BT.2020.

Here's how it stands...

Main + 2 sides;
(Remember it has to be under 18Gbps…)

4K 60 4:4:4 (no HDR) = 17.82Gbps

4K 30 4:4:4 10b-HDR (no 60fps) = 11.14Gbps

4K 60 4:2:2 10b-HDR (no 4:4:4) = 17.82Gbps

Main + 3 sides;

4K 60 4:4:4 10b-HDR = 22.28Gbps


Bottom line – there currently is no 4K 60 4:4:4 HDR supported by HDMI 2.0. We need HDMI 2.1. The good news is that there’s not many applications that would require the combo of all three sides anyway. We're most commonly watching 24fps, 4:2:0 chroma, or both, in which case we're under the 18Gbps. Happy days. It’s just something to be aware of for now, whenever you see that moniker.

引用:

原帖由 北德文斯克 于 2019-12-24 14:56 发表
现在的2070s相比5年前也就是性能翻倍最多拐弯的效果，即使这样4k下游戏的性能依然远远不能达到

如果4k下游戏性能达到的话，VR头显也会突破，需要5-10年吧

不用那么玄乎，现阶段能实现完整的4k HDR 60HZ就足够了，电视和主机能支持hdmi2.1就行了

pc和显示器这边用当前的dp1.4已经可以了

但hdmi2.1到目前为止还是杀猪价，一根线卖100，电视也没几家支持的（2年前的，现在不知道）

引用:

原帖由 danshu 于 2019-12-24 15:20 发表
显示器的DP接口笑而不语

但我能说pc显示器这边也挺狗屎的，主流显示器屏幕参数不要说和imac比，和同价位的电视也不能比

普遍还是300nit，还谈hdr也是笑话，4k的屏幕也比较稀少，都是高价屏

posted by wap, platform: iPhone

引用:

原帖由 @EpilogueSKM  于 2019-12-24 15:59 发表
电视hdr亮度标准在显示器上没有意义，1000尼特这距离把你眼都亮瞎了。

问题是20年前的液晶就已经都是250nit了，苹果的mbp也基本500nit，这还是笔记本呢

posted by wap, platform: iPhone
关键是开4khdr后损失灰度信息暗部细节丢失，桌面都异常恐怖

posted by wap, platform: Chrome

引用:

原帖由 @ps2xboxngc  于 2019-12-25 10:09 发表
性价比最高的LG B9 淘宝8000块，看了对比OLED还是强太多了，都想换电视了

OLED电视不是有低电平关断导致暗部细节全无的bug吗，当年买车B6我是肉眼验证的

不知道现在还有没有这个问题