VGA ( Video Graphics Array）Port Feature:
1.15 pin , Analog signal transmission;
2.Bad anti-interference performance , it will have color distortion when using long cables;
3.Now most digital products is transferring digital signal , so it firstly needs to transfer into analog signal and then transfer into digital signal , so some information will get lost and causing image quality degradation.
DVI （Digital Video Interface）Port Feature:
1.Better electromagnetic compatibility;
2.Long distance and superior quality digital signal transmission;
3.Fast transmission speed , pure and beautiful color performance;
4.To transfer video signal which has big resolution.
HDMI （High Definition Multimedia Interface）Port Feature:
1.High definition and small interface;
2.To transfer Digital video and audio signal;
3.Be able to transfer video and audio signal to display simultaneously;
4.Widely be used for digital product , like Set Top Box , DVD , PC , Laptop etc.
Transmission between VGA and DVI : Because VGA is analog signal , DVI is digital signal , so the video signal will get loss and causing color distortion when they transmit.
Transmission between DVI and HDMI : Because both of them are digital signal , so they will have interconversion and will not causing any color distortion. But if transfer HDMI into DVI , the audio signal will be canceled out.
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