Most importantly, the video resolution supported by the screen is also reported, so that the video source knows if it should be outputting a signal at 720p, 1080p, 4k, or something else entirely.įor televisions, this is probably going to be one of a small handful of options.
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There’s a whole host of information about the display hardware that is handed off so that the video source can send over a signal of the correct resolution and quality.įirst, the EDID version and manufacturer information of the screen is included (model number, serial number, etc.). It’s not just the size of the screen your using that’s exchanged during the EDID “handshake” process, though.
What Information Does HDMI EDID Exchange?
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To understand what these problems may look like and how to fix them, first we need to understand what information HDMI EDID transfers in a little more detail. If you have a video source that has to go to a receiver or HDMI switcher, for instance, and then to a screen, you’re adding steps that the EDID process has to make it through before things will work properly. That said, just because you can’t disrupt the HDMI process on a bits-over-wires scale, that doesn’t mean you won’t run into EDID problems when you have a complicated setup with lots of HDMI souces or transfer steps.
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There’s not a way you can “break” the EDID process because you’d have to be messing with the pins on the transfer cables, or modifying the hardware and code on the respective devices motherboards. This is kind of like how HDMI ARC works, except HDMI ARC and eARC are more about the video content and how it should be represented, not the hardware capabilities.Īnd the EDID standard is so baked-in to modern video formats that it’s kind of hard for things to go wrong. The cable has channels that are specifically used to facilitate this “handshake” process, and it happens instantly when the screen and video source are connected and powered on.
How Does HDMI EDID Work?ĮDID works by establishing a connection between the screen and video source in which they exchange data via a “handshaking” process. However, with more complicated setups, you might run into obscure HDMI EDID issues. When connecting one device to one other device, this is usually true. Usually, this is part of the “magic” of HDMI: something behind the scenes you never have to think about. When using HDMI, the EDID from your television tells the video source what the dimensions of the screen are. It’s such a reliable and simple standard, in which connecting devices usually “just works” without a hitch, that it’s easy to forget there are some interesting things going on under the hood, like HDMI EDID.Įxtended Display Identification Data (EDID) is a metadata standard that lets display devices like monitors, televisions, and projectors communicate their capabilities to the video source. The HDMI format pulls off a neat trick of simplifying video transfer in your home theater (more on HDMI devices like switches in our guide).
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