What is EDID and why is it important?

With all the technology associated with HDMI, lots of elusive terms come into play. One term that comes up pretty frequently is EDID.

What is EDID?

This question comes up a lot when troubleshooting unusual video setting issues with customers. EDID is an acronym for “Extended Display Identification Data”.It might seem a little simplistic, but it actually refers to the method your devices use to “talk to each other”. This short set of letters can be the source of a major headache when it comes to HDMI. When establishing an HDMI connection, the source device must be able to communicate with the display (known as the Sink) and find out what capabilities it has. The communication between these two devices is what is known as the “HDMI handshake”.During this process, the source is attempting to find out what the Sink’s maximum capabilities are so it can transmit the best possible signal.

My usual basic description is that EDID is the information provided by a monitor to the video source describing the monitor’s capabilities. This allows the video source to then send out a video signal that is supported by the monitor. EDIDs are important for DVI and HDMI video sources and occasionally used for VGA sources.

Of course if you really get into it, EDID is far more complicated. It includes vendor and product id, serial number, manufacture date, size of the display, resolution and frequencies supported, and detailed signal timings for native resolutions. Plus, often when we speak of EDID we are actually referring to E-EDID, or Enhanced Extended Display Identification Data. This allows the devices to handle additional data, including vendor-specific specifications, as it opens up the data strings to 32 Kilobytes. It’s just another way for your electronics to get a conversation going, but with a little more information.

When EDID was first introduced in 1994 it was short and sweet at just 128 bytes. It had vendor and product information, EDID revision, display capabilities (size, resolution, sync, etc), colour space, and detailed resolution/timing information. In 2000, E-EDID expanded this, allowing multiple 128 byte chunks. Today’s HDMI devices most often use E-EDID and include information to also specify audio capabilities including codecs, sampling rates, and channels.

In conclusion, here are the types of information that might be communicated:

  • EDID version
  • Manufacturer ID
  • Model Number
  • Serial Number
  • Video Resolutions
  • Video Timing Bitmaps and Descriptors
  • Chromaticity Coordinates
  • Video Field Rates
  • White Point Descriptors
  • Display Power Management Info

I’m not going to get too low level or technical here, as this information is already available online and is just a quick Google search away. However I do want to address the practical concerns of EDIDs when using our products.

When you connect your video source (e.g. camera, laptop, scientific instrument, etc) to any VVdeals (HDMI or capture and streaming) device, our device acts as the “monitor” for your video source.


This default EDID is generally good and works with a broad range of video sources. Sometimes, though there may be some troubleshooting.

Why so sad?

On the surface, this seems like it should be a simple process, right?

Not so fast. As long as you are connecting a single source to a single display, it’s usually smooth sailing.

However, throw in another device like a switch, extender or a splitter and chances are your devices might stop talking to one another. On occasion, the source device might have its EDID ROM coded incorrectly, which will cause issues from the outset.

In these cases, you might have trouble reaching the correct resolution or color issues. It might just fail to produce audio and/or video all together.

EDID Troubleshooting

The first step when you’re having issues you believe are related to EDID is to determine if it is the source device causing the issue.

Step 1

Connect the device directly to the TV with nothing in between to see if this solves the problem. If it does, then it’s the middle man causing issues.

Step 2

If it still fails to work, try connecting the source to a different TV that you know to be reliable. If this also fails, then your problem most likely lies with the source.

Step 3

Try updating the manufacturer firmware for whichever device you believe to be the troublemaker. This often takes care of the problems quickly and easily.

Step 4

Check the length of the cables you are using. The HDMI signal depends largely on the power of the device to which it is connected. Typically, HDMI can be transmitted up to 50 feet without issue (check How far your HDMI cable can be run), but some devices just don’t output enough power to make it past 30 feet or less (computers and gaming systems).

If the device isn’t producing enough power, the signal isn’t going to make it to its destination and the source will never get its EDID from the display. Splitters, switches, and of course, extenders, give that signal a boost to carry it further, but these also come with limitations. Check the device’s manual to ensure your cables are not too long for the run.

Step 5

Is your source a computer? Many TVs only accept specific computer resolutions. Make sure the resolution you are attempting to achieve is supported by your TV.

There are a number of different reasons your HDMI compliant devices might have trouble communicating, but hopefully this will get this you started if you’re experiencing issues! Remember, it may not always be the case that you’re working with defective devices. It could just be a missed communication.

How Far You Can Run HDMI Cables

HDMI is no longer strange for us now; it is everywhere in your home, your HD TVs, HD media players, Set-Top Box, your HD displays, your HD cameras, your HD recorders and so on. We couldn’t ignore it in our daily life. Thus here comes the question, do you know what’s the maximum length you can run the HDMI cables? You might have no idea. Yes, most of us would never have thought about this question. However, there is the case that we need extend our HD devices to a longer distance, such as extend the HD signals of your HD media player from one room to another room, then do you know the max length you can go. So let’s check the case.

There are two categories of HDMI as defined by the HDMI organization, “standard HDMI cables” and “high speed HDMI cables”:

Standard (or “category 1″) HDMI cables have been tested to perform at speeds of 75Mhz or up to 2.25Gbps, which is the equivalent of a 720p/1080i signal.

High Speed (or “category 2″) HDMI cables have been tested to perform at speeds of 340Mhz or up to 10.2Gbps, which is the highest bandwidth currently available over an HDMI cable and can successfully handle 1080p signals including those at increased color depths and/or increased refresh rates from the Source. High-Speed cables are also able to accommodate higher resolution displays, such as WQXGA cinema monitors (resolution of 2560 x 1600).

The HDMI specification specifies required performance of a given cable, but does not govern the length as long as the cable meets the given requirements. So how far of an HDMI cable can you run from your video source to your television set? The professional technical support from VVdeals recommends 25 feet as a practical limit for their high speed cables to carry both a 1080p and 3D signal. After 25ft they are no longer certified for high speed. And with the longer distance increase, the quality for the videos would decrease.

Standard speed cables can carry 1080p but it depends on the device is why we only list them as 1080i/720p. Many newer devices though if all you want is 1080p can achieve that with standard speed cables, you only really need a standard speed cable if you are running both 3D and 1080p.

The specifications on HDMI cables themselves as a technology (disregarding manufacturer specs) do not give an explicit limit in cable length. However, there is another way to know the limits on cable length. The HDMI Authorized Testing Centers give certificates for cables based upon speeds, reliability, and cable length. The longest cables to successfully pass the ATC tests for reliability and speed are around 45 feet long. These pass the HDMI 1.3a tests. While there are many 50 feet cables on the market, these generally may not have passed compliance testing, and further research should be done to ensure reliability.

There are cables that use an amplifier or repeater to compensate for high frequency data losses over the increased length of the cable. These can work excellently and maintain quality, but are not always the best option.

For sakes of practicality, any cable that is approximately 50 feet or less in length will work reliably. Economical cables and lower quality manufactured cables can maintain 780p or 1080i. Premium cables under 50 feet will be able to reliably achieve 1080p. However the device specifications and quality also play a role in the data transfer rates and reliability. Some devices won’t be able to utilize the high-speed capacity of certain cables and could produce losses with increasing lengths even with an excellent quality cable. Therefore, it is wise to consult with specific cable specs and device specs to determine the quality needed and what if any losses will be over certain lengths. If cables exceeding this “maximum” capacity are needed, cables with the amplifiers or extender are available.

Then think of the “25 feet” as the magic barrier. So what to do if you need to go longer distances and insist on carrying a 1080p signal without sacrifice of signal loss? All hope is not lost. You have a couple of alternative solutions including more HDMI cables and cat6 Ethernet cables. As HDMI cables are more expensive and the quality would decrease when the distance is longer. So Cat5e or cat6 network cables would be highly recommended. CAT6 ethernet cables which allow for runs up to a whopping 330 feet. You can use a HDMI network extender to transmit HD signals to a longer distance as long as you can. Of course, if you don’t like wires in a mess, a wireless HDMI extender would be an good option.

hdmi extender over cat6 cat5

Anyway just make sure that your cable matches your application and that all specs are up to speed when you’re going for longer distance transmission.

Update 11/18/2018

How to Connect a Laptop to a HD TV

Attaching your laptop to the HDMI jack on your HD TV allows you to view your computer’s contents on a much larger and sharper screen. You can also utilize your PC’s broadband Internet connection to watch streaming movies and TV shows on your TV’s big screen.

There are several ways to get high-definition quality graphics from your laptop to an HDTV. It depends upon the type of laptop you have and the features it’s equipped with. Some newer model laptops come equipped with an HDMI jack, making it HDMI-ready. In this case the connection is simple. Use an HDMI cable to connect the laptop’s HDMI jack to the TV’s HDMI jack to get HD from the laptop to the TV. If the laptop does not have an HDMI jack there are many solutions for your option.

Using USB to HDMI Converter (for any laptop with USB)
Almost all the laptop has a USB port, either USB 2.0 or USB 3.0. It’s very simple to hook up your laptop to TV with a USB to HDMI adapter. The USB to HDMI converter has a audio input that will support both video and audio transmission. Just plug and play, then you can enjoy the HD movies on your bigger TV screen. One thing you’d pay attention to is, if your laptop has USB 2.0 port, you’d better choose the USB 2.0 to HDMI converter. While for those who have got the newest MacBook Pro that built with USB 3 port, it’s better to choose the USB 3.0 to HDMI adapter.

Using VGA to HDMI Converter (for laptop with VGA port)
If you don’t like to take the USB port when you just get 1 or 2 USB port on your laptop, you can use a VGA to HDMI converter to connect your laptop with TV. You can learn more about how to connect PC VGA to HD TV.

Using a Mini DisplayPort/ Thunderbolt to HDMI Adapter (For Mac Laptops)
For Apple fans, your Macbook or other Mac laptop/PC has built with a mini displayport or thunderbolt. In this case, try Mini DisplayPort/ Thunderbolt to HDMI Adapter. This allows you to send high-definition quality graphics from your Mac laptop to your HDTV.

With the above solutions, you can enjoy HD program from your laptop on your TV now

Fantastic New 4 in 1 Camera Lens for iPhone 5 Is Arriving

our new iPhone 5 camera lens with Special effects shots and Front-facing lens is arriving. It’s the upgrade of the 3 in 1 iphone 5 photo lens. Its appearance has greatly improved and a front iphone fisheye lens was added to it. At the same time our designer has improved the method of use, allowing users to use the camera lens to take pictures and enjoy the self timer more convenient.

This 4 – in – 1 iPhone camera lens will let you have the wonderful self – timer experience. Its rotating design makes you switch lenses freely that you only need to move finger to rotate the camera. With the front – facing fisheye lens, you can enjoy the fun of the self timer with fisheye effect in every moment.

The following picture is how it works for you


iphone 5 camera lens

So take the 4-in-1 camera lens for Iphone 5  and enjoy a fantastic shooting. Of course, you can take it to watch games or tavel. Never miss the great moment again.

Now enjoy some pictures from this iphone camera lens.
fisheye1 fisheye2 micro1

How to Have Multiple Monitors Connect to Your iMac

iMac is one of the creative item in the world. It brings us an innovative idea for an electronic thing. It is an elegant all-in-one computer that is as much a work of art as it is state of the art. It allows you to enjoy comfort and productivity with a widescreen display and high performance technologies. However, the chances are that sometimes you may need extra monitors to enlarge or extend your workspace. With external displays you can organize your projects by limiting certain programs to a specific monitor, while arranging other applications on another monitor. Multitasking becomes easier. So here is the guide for you on how to have multiple monitors for you iMac.

For most people, they would consider to buy a mini displayport/Thunderbolt to VGA adapter , Mini DisplayPort/Thunderbolt to DVI adapter or mini displayport/Thunderbolt to HDMI adapter to hook up to another monitor. It does work for you. However, it is not the perfect solution for you since it just works as an extra display for you. Have you imagined making your monitor work as an extra computer for you? It’s not a dream. You can make it by following the guide below.

1. VGA monitor to iMac
If you only have a VGA port monitor, you can also use it as a computer by connecting a USB to VGA adapter. The USB to VGA adapter converter enables you to connect additional display devices (CRT/LCD monitor or projector) to your iMac or other computer. The connected monitor can act as a mirrored or extended desktop of your iMac or other PC. In this way, your iMac works as an extra computer for you. You can play games on your iMac, while your family watch movie on the connected display.

2. HDMI monitor to iMac
If you monitor has a HDMI jack, you can use USB to HDMI adapter to connect them. If you’re boring for not having good program for your TV, now hook up your HD TV to your iMac with the USB to HDMI converter and watch program online. Enjoy whatever you like on a bigger and high definition display while somebody in your family can work or surf online with the iMac. No bother each other anymore. It’s perfect, right?

This solution will save you money to buy additional computer and also will help you work in a more efficient way since the USB to VGA converter and USB to HDMI converter have several modes for you. They will make your additional monitor work as an extending screen or mirror one for you. That is good for your work. You don’t have to change windows when you are checking graphics or data with the extending function. While the mirror function will do well for you when have meeting. These USB adapters can connect up to 6 monitors for you. That’s amazing, right? Of course, this has demands on your computer. But your iMac is designed for a high performance. So don’t worry.