Franc Vint

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Why do we need to learn about EDID? When we statistically and analyze the problem that the signal source is not displayed on the terminal display when the customer uses the HDMI matrix switcher and HDMI extender, most of the reasons are caused by EDID. Then, what is EDID? Let's take a look together.

EDID: Extended Display Identification Data ---- refers to the display device data transmitted in DDC communication.

Q1: What is EDID?

A1: The full name of EDID is Extended Display Identification Data (refers to the display device data transmitted in DDC communication). The EDID of VGA and DVI consists of 128 bytes in the main block. The EDID of HDMI adds an expansion block (128 bytes). The content of the expansion block is mainly audio Attribute-related, DVI and VGA have no audio, HDMI comes with audio, and the expansion block data specification is defined in accordance with the CEA-861x standard, which may increase to an integer multiple of 512 or 256 in the future.

It contains parameters related to the display and its performance, including supplier information, maximum image size, color settings, manufacturer presets, frequency range limitations, and strings of display name and serial number, etc. To put it vividly, EDID is a collection of ID cards, household registration books, skills certificates and other documents of the display. The purpose is to tell others who I am, where I come from, and what I can do.

Q2: Why use EDID?

A2: In order to allow PC or other image output devices to better identify display attributes

EDID did not exist in ancient times. In the ancient CRT period, there was no concept of EDID. Why did it exist later? Because with the development of display devices, there are more and more types of monitors, such as analog, digital, general screen, widescreen, 17-inch, 19-inch, 22-inch...This makes the PC dumbfounded, resolution and timing There are too many types, and each monitor cannot support all resolutions, so how do you know what resolution to give the monitor? Is the displayed effect the best? Not only that, but outputting a resolution at random may also damage the display hardware, which is too dangerous. As a result, EDID was ordered to act as the microphone before the display and PC. "Hello PC, I am A monitor, I can display N resolutions, the best resolution is XXX". "Hello monitor, I have received your message, and now I will output it to you at the best resolution." Now everyone understands, EDID is designed to allow PCs or other image output devices to better identify the attributes of the display.

Q3: I often hear comrades say "EDID information" for a while and "DDC information" for a while. So which statement is more accurate? What is the relationship between EDID and DDC?

A3: The full name of DDC is Display Data Channel. As the name implies, it is a channel. We can say that DDC is used to transmit EDID information, or that EDID information is transmitted through DDC, so the term "DDC information" is not accurate.

Q4: Is there only one EDID for each display?

A4: Not necessarily.

Nowadays, monitors are very powerful and usually provide multiple video interfaces, such as DVI, VGA, HDMI, Display Port, etc. The characteristics and bandwidth of each interface are different, so that the EDID of different interfaces is also different. Which interface is used, the PC reads the EDID of which interface. Our equipment mainly uses DVI, VGA, HDMI several interfaces. Since several formats of the VIDEO interface, such as PAL, NTSC, etc., have fixed resolution and field frequency, there is no need to use EDID, so they are not discussed.

Q5: What is the use of EDID for us?

A5: To answer this question, we must first clarify the application scenarios of our equipment, please see the picture below

Conservatorium High School

Address: Conservatorium Rd, Sydney NSW 2000, Australia

The former Houston Rockets star big man Yao Ming was a franchise-changing talent throughout his entire NBA career that was disappointingly cut short due to injury. He was the biggest and most successful talent to come into the league from China that been a pivotal factor in garnering international recognition across the entire globe that it has become today. Since his retirement, Ming has taken a unique path toward staying around the game that helped him global a sport icon.

Although he spent just nine seasons in the NBA, Ming’s impact and presence on the floor was undeniable.

He was an extremely polished offensive talent while being a huge factor in the paint defensively as a legitimate rim protector that was evident in his five years with Shanghai Sharks in the Chinese Basketball Association. Ming arrived in the NBA as the complete package offensively at his size as he had the moves in the low post while possessing the ability to be an effective scorer from the mid-range.

That saw him pile up eight All-Star selections, two All-NBA Second Team nods, three All-NBA Third Team nods, an NBA All-Rookie First Team selection, and had his No. 11 jersey retired by the Rockets. He reached the playoffs five times while reaching the Western Conference Semifinals once and winning 50-plus games four times. His career may have been short, but he proved in his short time to be a Hall of Famer earning an induction as part of the 2016 class.

Ming’s career was cut short due to nagging foot and ankle injuries as a third fracture in his left foot that occurred near the tail end of 2010 proved to be the tipping point toward retirement.

Since stepping away from the NBA, Ming hasn’t removed himself away from the game of basketball.

Ming has made several personal investment ventures over the years that include a restaurant in Houston named ” YAO Restaurant & Bar” along with one in Shanghai and a winery located in California.

The 39-year-old helped launch the NBA Yao Basketball Club in 2014 that works in conjunction with the NBA. In February 2017, Ming took another significant step forward as the Chinese Basketball Association had a unanimous vote to appoint him as their president.

He has operated from that position over the last few years as he has helped further expand the reach of the CBA. Before taking that position, Ming had owned the Shanghai team since 2009 before selling his entire shareholder before the 2017-18 season.

Ming has a reported net worth of $120 million that largely stems from his contract earnings from the NBA along with his various endorsement deals.

It has been nearly a decade since Ming stepped away from the NBA due to injury, but it has given a more precise picture to reflect on his legacy and ability on the court.

Beyond just his large stature at 7-foot-6 that made Shaquille O’Neal look normal-size, Ming was a dominant factor in his own right. It was the injuries that genuinely prevented him from putting together a long career that could have seen him accomplish much more in the league.

He had an entire skill-set that made him a challenging defensive assignment for any defender due to his all-around ability in the low post and the mid-range. Although other centers such as O’Neal, Wilt Chamberlain, Bill Russell, Kareem Abdul-Jabbar, and Hakeem Olajuwon all deserve much recognition, it often leaves Ming overlooked.