These are all video output interface
VGA-High Definition Output, projector, high-definition television.
DVI-Digital video, digital TV.
HDMI-High Definition Multimedia, HDMI technology not only provides clear picture quality, but also due to the audio/video using the same cable , greatly simplifies the installation of home theater systems.
DisplayPort - High Definition Transmission
HDMI: HDMI is the English term for High Definition Multimedia, which means High Definition Multimedia Interface in Chinese. HDMI interface can provide up to 5Gbps data transmission bandwidth, can transmit uncompressed audio signals and high-resolution video signals. HDMI is pin-to-pin compatible with DVI, but in a different package. Compared to DVI, HDMI can transmit digital audio signals and adds support for HDCP, while providing better DDC optional features.HDMI supports a data transfer rate of 5Gbps and can transmit up to 15 meters, which is sufficient for a 1080p video and an 8-channel audio signal. And since a 1080p video and an 8-channel audio signal requires less than 4GB/s, HDMI has a lot of headroom. This allows it to connect a DVD player, a receiver and a PRR with a single cable respectively. In addition, HDMI supports EDID, DDC2B, so devices with HDMI have the characteristics of "Plug and Play", the signal source and the display device will automatically carry out "negotiation", automatically selecting the most suitable signal. "and automatically select the most appropriate video/audio format. The benefits of using HDMI is: only one HDMI cable, you can simultaneously transmit audio and video signals, unlike the current need for more than one cable to connect; at the same time, due to the wireless digital / analog or analog / digital conversion, you can achieve a higher quality of audio and video transmission. For consumers, HDMI technology not only delivers crystal clear picture quality, but also greatly simplifies the installation of a home theater system by using the same cable for both audio and video
The final version of the DisplayPort display interface standard, DisplayPort 1.0, is the successor to DVI, and will include the ability to transmit high-definition audio signals while transmitting video signals. In addition, DisplayPort also supports HD audio signaling, as well as higher resolution and refresh rates. DisplayPort supports both external and internal display connections, and VESA expects notebook manufacturers to use DisplayPort not only for standalone displays, but also for direct connectivity to LCD monitors and motherboards, making it easier to upgrade from one notebook to the next. For this reason, the DisplayPort interface is also designed to be very compact, which is convenient for notebook use and allows graphics cards to be configured with multiple interfaces. Specifications:Supports single-channel, unidirectional, and quad-line connections with a data transfer rate of 10.8Gbps, which is sufficient for transmitting uncompressed video and related audio, as well as a 1Mbps bidirectional auxiliary channel for device control, in addition to 8-bit and 10-bit color support. In addition, DisplayPort supports 8-bit and 10-bit color. In terms of data transfer, DisplayPort uses a "micro-packetized" format that is highly scalable, allowing for the addition of new content in the future.
DVI is a high-speed digital signal transmission technology invented by DDWG (Digital Display working Group), and has two different interface forms, DVI-D and DVI-I. DVI-D only has a digital interface, while DVI-I has both digital and analog interfaces. DVI-D has only digital interface and DVI-I has both digital and analog interface. Based on TMDS (Transition Minimized Differential Signaling) technology to transmit digital signals, TMDS uses advanced coding algorithms to encode 8-bit data (R, G, B in each of the base color signal) through the smallest conversion to 10-bit data (including line-field synchronization information, clock information, data DE, error correction). Information, data DE, error correction, etc.), after DC balancing, the use of differential signal transmission data, it and LVDS, TTL compared to have better electromagnetic compatibility, can be realized with low-cost special cable long distance, high-quality digital signal transmission.DVI digital signal transmission has a single connection (Single Link) and dual connection (Dual Link) two ways, for single Connection, only with the 1/2, 9/10, 17/18 feet shown in Figure 1 transmission, its transmission rate of up to 4.9Gbps, dual-connection up to 9.9Gbps DVI interface in the digital TV, flat-panel TV application research, the more critical is the EDID (Extended Display Identification DATA, i.e., Extended Display Identification DATA) programming, HDD, HDMI, DVI, DVI, DVI, DVI, DVI, DVI, DVI, DVI, DVI, DVI, DVI, DVI and DVI. Data) programming, HDCP (High-bandwidth Digital Content Protection) function is realized. These are new applications for digital TV, only EDID and HDCP in the realization of digital TV, DVI interface is the real digital TV interface.