[Turn] Computer graphics 4 Types of interface: VGA, DVI, HDMI, DP

Computer graphics full Name display interface card (video Card,graphics card), also known as the display adapter (video adapter), is one of the most basic components of the PC. For the graphics interface type, mainly including VGA, DVI, HDMI, DP The four more common interface, of course, there are other.

VGA interface is the most common, that is, our usual computer monitor connected to the host, the VGA interface is a type D interface, a total of 15 stitches, divided into three rows, each row five. and VGA interface extensibility is strong, can easily be converted to DVI interface, VGA interface introduced such as:

Through the above introduction of the VGA interface consists of 15 pins, then 15 pins are the meaning of the above? What is the function? As shown in the following:

VGA interface Pin

At present, most of the computer and external display devices are connected by analog VGA interface, the computer's internal digital display image information, the digital/analog converter in the video card is converted to R, G, b three primary color signal and line, field synchronization signal, signal transmission through the cable to the display device. For analog display devices, such as analog CRT display, the signal is sent directly to the corresponding processing circuit, drive control tube generation image. And for LCD, DLP and other digital display equipment, display equipment need to configure the corresponding A/d (analog/digital) converter, the analog signal into a digital signal. After the conversion of D/A and a/d2, the loss of some image details is inevitably caused. VGA interface applied to CRT display is understandable, but used to connect a display device such as liquid crystal, the conversion process image loss will make the display slightly lower.

DVI Interface : LCD display came into being interface, DVI (digital video Interface), that is, the number of the interface. It was formed in 1999 by Silicon Image, Intel (Intel), Compaq (Compaq), IBM, HP (Hewlett-Packard), NEC, Fujitsu and other companies DDWG (Digital Display working Group, Digital display workgroup) introduced the interface standard.

DVI interface has 3 types of 5 kinds of specifications, terminal interface size of 39.5mmx15.13mm. Three types include interface forms for Dvi-a, Dvi-d, and Dvi-i. Dvi-d only Digital interface, DVI-I has digital and analog interface, the current application mainly dvi-d mainly, at the same time dvi-d and Dvi-i also have a single channel (one link) and two channels (Dual link) of the points, we usually see is a single channel version, Dual-channel version of the cost is very high, so only some professional equipment, ordinary consumers are difficult to see. Dvi-a is a kind of analog transmission standard, often in the large screen professional CRT can see, but because and VGA no essential difference, performance is not high, so dvi-a in fact has been discarded. ：

The above is the three types of DVI, using the DVI interface, the advantage is the speed, and the picture is clear. Five kinds of specifications:

HDMI interface : High-Definition multimedia interface is a digital video/audio interface technology, is suitable for image transmission of a dedicated digital interface, which can simultaneously transmit audio and video signals, the highest data transmission speed of 5Gbps. There is no need to do a number/modulo or modulo/number conversion before the signal is transmitted. HDMI can be paired with broadband digital content protection (HDCP) to prevent unauthorized reproduction of copyrighted audio and video content. The additional space available in HDMI can be applied to future upgraded audio and video formats. And since a 1080p video and a 8-channel audio signal demand less than 4Gbps, HDMI also has a very dayu amount. This allows it to connect DVD players, receivers and PRR with a single cable. ：

HDMI interface Advantages HDMI not only can meet the 1080P resolution, but also support digital audio format such as DVD audio, support eight-channel 96kHz or stereo 192kHz digital audio transmission.　　HDMI supports EDID, DDC2B, so the device with HDMI has "Plug and Play" features, the signal source and display devices will automatically "negotiate", automatically select the most appropriate video/audio format. Compared with DVI HDMI interface volume is smaller, DVI cable length can not exceed 8 meters, otherwise it will affect the picture quality, and HDMI can be transmitted up to 15 meters. As long as an HDMI cable, can replace up to 13 analog transmission lines, can effectively solve the home entertainment system behind the tangled problem. The following are the HDMI interface parameters and versions of the comparison of features:

DP interface: HD interface for challenging HDMI

The DP interface is the DisplayPort interface, a high-definition audio and video stream transmission interface. The DisplayPort has two types of external connectors: one is standard, similar to USB, HDMI, and the other is low profile, mainly for applications with limited connection area, such as ultra-thin notebook computers. The longest external distance between the two connectors can reach 15 meters, although this distance is less than HDMI, but the connector and wiring specifications have been ready for future upgrades, even if the future DisplayPort adopt the new 2X rate Standard (21.6Gbps), Connectors and wiring do not have to be redesigned. In addition to the device-to-device connection, the DisplayPort can also be used as an interface within the device, or even as a data interface between the chip and the chip. ：

What are the differences between the DP interface and the HDMI interface?

HDMI is a standard that is tightly controlled by the HDMI organization and copyright. It cannot be a proprietary application, and all data structures and available modules are defined. Technically speaking, the DisplayPort is better and robust for longer and finer cables. It can easily and freely reduce the process. In the computer market, its open mode and extensibility characteristics, for higher bandwidth, multi-data streams and other data flow is the first choice.

Four commonly used video card interface is finished, now for the video card display input interface a few options are as follows:

1, the VGA interface because is analog signal, inevitably caused some image detail loss, only applies to 20 inches below the display use;

2, if the display using 1920*1200 the following resolution, DVI-I,DVI-D,HDMI,DP interface can be, screen size impact is small;

3, if the display uses ultra-high resolution, such as 2560*1600 or multi-screen display output system, the dual-channel DVI-D,HDMI,DP can be competent;

4, if the use of 3D display, 1920*1080 resolution, dvi-d, HDMI and DP is not too big problem, if 2560*1600 above the best choice of HDMI and DP output interface.

[Turn] Computer graphics 4 Types of interface: VGA, DVI, HDMI, DP