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What is the difference between VGA, DVI and HGMI?
What is the difference between these screen connections...

If you have been using computers for some while you must have noticed that they come with different video connection ports, such as VGA, DVI or HDMI. The reason for this is that a unique standard for video connections hasn’t been defined yet. In this article we will try to explain the visual and technical differences between VGA, DVI and HDMI inputs.



VGA stands for "Video Graphics Array” and was first used in 1987. Although it can be considered to be a little ‘out of date’ today it can still be found on many PCs and it works using analogue signals. Due to the high frequencies it applies VGA can display relatively high defined pictures. But the picture quality will be dependent on the quality of the cable. 

A VGA connector contains 15 pins devided in three rows and has the shape of a trapezium. Blue is generally the colour used for VGA connectors.

Regarded as the successor of VGA, DVI has started to be used more and more on computers and screens. DVI has different connectors than VGA and is also less popular in comparison to VGA. Apart from on the rarely found DVI-A all operations happen through uncompressed digital videos. This means that the picture quality is not dependent on that of the cable.
On the DVD-D there is a horizontal pin next to the connector and there are no further ones beneath or above. You can only see the DVD-D above during digital video transmission.
As well as having quite a similar connector as DVD-D, DVI-D comprises of four pins surrounding the straight pin. These pins carry an analogue signal in compliance with VGA standards. Thus DVI-I connectors are capable of carrying both digital and analogue signals at the same time.
At this time it is HDMI that is regarded as the successor of the former technology, DVI. Since it is often seen on high definition TVs HDMI has become very popular. Due to its small size and in compliance with new generation TVs HDML is becoming more and more common among PCs.
Like DVI HDMI is also designed to transmit uncompressed data to digital. Beyond video signals HDMI can bear eight uncompressed or compressed digital sounds.


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