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Display Data Channel (DDC) is a collection of protocols for digital communication between a computer display and a graphics adapter that enable the display to communicate its supported display modes to the adapter and that enable the computer host to adjust monitor parameters, such as brightness and contrast.
The Display Data Channel or DDC is a digital connection between a computer display and a graphics adapter that allows the display to communicate its specifications to the adapter. The standard was created by VESA .
Before Display Data Channel (DDC) and EDID were defined, there was no standard way for a graphics card to know what kind of display device it was connected to. Some VGA connectors in personal computers provided a basic form of identification by connecting one, two or three pins to ground, but this coding was not standardized.
The Display Data Channel (DDC) is a VESA standard communications channel based on the I 2 C bus specification. HDMI specifically requires the device implement the Enhanced Display Data Channel (E-DDC), which is used by the HDMI source device to read the E-EDID data from the HDMI sink device to learn what audio/video formats it can take.
On the I2C bus, the first byte of a transaction consists of the 7 address bits, transmitted MSB first, followed by the read/write bit (R=1, W=0). So the byte is made up by (addr << 1) + 1, or 2*addr+1, which is 2*0x50+1 in this case, resulting in 0xA1. However, I agree this sentence should be removed. The information is completely irrelevant.
The original MCCS standard version 1 was released on September 11, 1998. MCCS Version 2 was released on October 17, 2003. A major update of the standard, it provided support for flat panel displays, VESA DPVL (Digital Packet Video Link) standard; it added a range of television controls and introduced individual control of multiple windows on a display.
DisplayID, display identification data format, which is a replacement for E-EDID; VESA Display Power Management Signaling (DPMS), which can be used to invoke power saving modes in monitors; Digital Packet Video Link (DPVL), a display link standard that can be used to update only portions of the screen
The Video Graphics Array (VGA) connector is a standard connector used for computer video output. Originating with the 1987 IBM PS/2 and its VGA graphics system, the 15-pin connector went on to become ubiquitous on PCs, [1] as well as many monitors, projectors and HD television sets.