CONNECTIONS – Confusing or what – VGA – DVI-D HDMI

Personally I have not had a lot of experience when it comes to the cabling and connectors for Video…  I found this article that was talking about using a LCD TV for your computer monitor and he described the connections very well, so I thought I would post it.  If you wan to read the entire article – Can You Use A TV As Your Computer Monitor?

VGA, DVI-D and HDMI in a nutshell

The differences between these three are a source of a confusion for many, so I’ll do my best here to explain each.


15-pin VGA port

In the product description for an LCD TV, this port is labeled as D-Sub. On the actual television it’s labeled as “PC” or “VGA”. It is a three-row, 15-pin trapezoid-shaped blue port.

The way VGA works is simple enough to understand. The video card sends a digital video signal, it travels across the wire as analog and is converted back to digital at the monitor. For all intents and purposes this does mean VGA is an analog video signal, even though it started digital and ended digital.


DVI port

There are three major types of DVI. DVI-A, DVI-I and DVI-D. A is analog, I is integrated (analog or digital, single or dual-link) and D (single or dual-link) is digital. The only one you need be concerned with is D.

A DVI-D port on most video cards is white, although sometimes it’s blue. It looks distinctively different from VGA in the respect it’s longer, wider and has crate-like grid for input.

The difference between VGA and DVI-D is that DVI-D addresses the pixels (sometimes known as elements) more precisely on a display; that is why DVI-D looks better than VGA does and has truer color representation.


HDMI “Type A” port

Concerning televisions and monitors, the only thing you have to know here is that a DVI-D to HDMI works exactly as it should, as there is no signal conversion taking place from the two since DVI and HDMI are electrically compatible, meaning no video quality loss by doing so.

DVI-to-HDMI adapter

If you ever wondered why there aren’t any HDMI-specific video cards out there for general consumption, it’s because they simply aren’t required since the converter takes care of the job amicably.

When you convert DVI-D to VGA however, that’s a totally different story. You will see video quality and color quality drop by doing that. Reds won’t be as vibrant and in computer use some fonts may “fuzz” out noticeably at smaller sizes.


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