DVI (Digital Video Interface) is a popular form of video interface technology created to maximize the quality of flat panel LCD monitors and video graphics cards. There are three types of DVI connections: DVI-Digital, DVI-Analog, and DVI-Integrated.
DVI-D – Digital Video
It is used for direct digital connections between the source video; that is, video cards; and LCD monitors. This provides faster and higher quality images than using an analog (VGA) port. All video cards initially produce a digital video signal, which is converted to analog at the VGA output. The analog signal travels to the monitor and is converted back to a digital signal. DVI-D eliminates the analog conversion process and improves the connection between source and display.
DVI-A – Analog Resolution
They are used to carry a signal from a computer to an analog display, such as a CRT monitor. The most common use of DVI-A is to connect a VGA device, keeping in mind that DVI-A and VGA carry the same signal. There is some quality loss involved in digital to analog conversion, so a digital signal is recommended where possible.
DVI-I – Integrated / Analog and Digital
It is capable of transmitting either a digital-to-digital signal or an analog-to-analog signal. This makes it a more versatile connection type, being usable in either digital or analog situations.
NOTE: Like any other digital or analog format, the DVI formats are not interchangeable. This means that a DVI-D cable will not work in an analog system, nor a DVI-A cable in a digital system. To connect an analog source to a digital display, you’ll need a VGA to DVI-D converter. To connect a digital output to an analog monitor, you will need to use a DVI-D to VGA converter.