DVI传输的是数字信号，数字图像信息不需经过任何转换，就会直接被传送到显示设备上，因此减少了数字→模拟→数字繁琐的转换过程，大大节省了时间，因此它的速度更快，有效消除拖影现象，而且使用DVI进行数据传输，信号没有衰减，色彩更纯净，更逼真。
计算机内部传输的是二进制的数字信号，使用VGA接口连接液晶显示器的话就需要先把信号通过显卡中的D/A（数字/模拟）转换器转变为R、G、B三原色信号和行、场同步信号，这些信号通过模拟信号线传输到液晶内部还需要相应的A/D（模拟/数字）转换器将模拟信号再一次转变成数字信号才能在液晶上显示出图像来。在上述的D/A、A/D转换和信号传输过程中不可避免会出现信号的损失和受到干扰，导致图像出现失真甚至显示错误，而DVI接口无需进行这些转换，避免了信号的损失，使图像的清晰度和细节表现力都得到了大大提高。
最后，DVI接口可以支持HDCP协议，为将来看带版权的高清视频打下基础。不过要想让显卡支持HDCP，光有DVI接口是不行的，需要加装专用的芯片，还要交纳不斐的HDCP认证费，因此目前真正支持HDCP协议的显卡还不多。
Digital Visual Interface(DVI接口英文原文)
The Digital Visual Interface(DVI) is a videointerface standard covering the transmission of video between a source device (such as a personal computer) and a display device. The DVI standard has achieved widespread acceptance in the PC industry, both in desktop PCs and monitors. Most contemporary retail desktop PCs and LCD monitors feature a DVI interface, and many other devices (such as projectors and consumer televisions) support DVI indirectly through HDMI, another video interface standard. Most laptops still have legacy VGA and, in some models, HDMI ports, but fewer have DVI.
DVI was developed by an industry consortium, the Digital Display Working Group(DDWG) to replace the "legacy analog technology" VGA connectorstandard. DVI is designed to carry uncompresseddigitalvideo data to a display. It is partially compatible with the High-Definition Multimedia Interface(HDMI) standard in digital mode (DVI-D), and VGA in analog mode (DVI-A). It is also still found in some consumer television sets, despite having been superseded in this application by HDMI.
