VGA and DVI connectors are used to lớn transmit đoạn clip from a source (like a computer) khổng lồ a display device (like a monitor, TV or projector). The main difference between VGA and DVI is in picture quality and the way the đoạn phim signals travel.
VGA connectors and cables carry analog signals while DVI can carry both analog and digital. DVI is newer and offers better, sharper display compared to VGA. You can easily tell them apart because card đồ họa connectors (and ports) are blue while DVI connectors are white.
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In contrast to HDMI, neither card đồ họa nor DVI tư vấn audio. So when connecting with a TV or a projector or trang chủ theater system, you can use a single HDMI cable khổng lồ carry both audio and video signals or use a single VGA/DVI cable for đoạn phim and a separate audio cable.
Comparison chart
Differences — Similarities —
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| Digital Visual Interface | Video Graphics Array | |
| Cleaner, faster, more precise display with hardware that supports DVI. | Picture unique degrades from digital lớn analog conversion & back, và due lớn the analog signal being susceptible to noise. The maximum resolution claimed for a card đồ họa connector is 2053 x 1536. | |
| Hot pluggable, external, digital video clip signal, 29 Pins | Not hot pluggable, RGB analog clip signal, 15 Pins | |
| There are three types of cables:- DVI-A: Analog only DVI-D: Digital only DVI-I: Digital and Analog. | Analog | |
| Can convert lớn other standards lượt thích HDMI và VGAs. | VGA to lớn DVI and VGA khổng lồ HDMI converters available. | |
| None. Requires separate audio cable. | None. Requires separate audio cable. |
Quality of the signal
DVI offers a higher quality signal compared lớn VGA. The difference is especially noticeable at higher resolutions. The video unique is a factor of the mechanism of operation and the length and quality of the cable; both are discussed below.
Mechanism of operation
From a user"s point of view, both connectors work in the same way: devices have female ports và the connector cables have male endpoints. The signal is transmitted from the source device via the port lớn the connector cable và the destination, which is a display device.
VGA connectors transmit analog signals. The digital video signal received from the source is converted to lớn analog lớn be transmitted via the cable. If the display device is an old CRT (Cathode Ray Tube) monitor, it accepts an analog signal. However, most display devices are now digital; so they convert the đồ họa connector"s analog signal back khổng lồ digital. This conversion from digital lớn analog và back results in a degradation of video unique for đồ họa connectors.
Video signals transmitted over DVI need no such conversion because they are digital-only. Consequently, picture chất lượng is better. The difference may not be noticeable for text or even SD (standard definition) đoạn clip but can be seen for HD videos và hi-resolution images or on hi-res displays.
Cables
For both VGA and DVI connectors, signal quality is impacted by the chất lượng and length of cables. A cable carrying a signal is impacted by crosstalk which occurs when the signals in one wire induce unwanted currents in adjacent wires. đồ họa cables are more susceptible lớn electrical disturbances & noise compared to lớn DVI. Always use high quality cables that provide good, thick insulation.
Signal degradation is worse for longer cables; again, đồ họa cables are more susceptible to this problem. DVI cable lengths up to 15 ft work for displays at resolutions of 1,920 × 1,200. Cable lengths up to 50 ft can be used with displays at resolutions up to 1,280 × 1,024. For longer distances, the use of a DVI booster is required lớn mitigate signal degradation.
Types of connectors
The card đồ họa connector is also called RGB connector, D-sub 15, mini sub D15, mini D15, DB-15, HDB-15, HD-15 or HD15. It has 15 pins. There is only one type of vga connector và it is blue in color.
DVI ports come in three types:
1. DVI-D is the digital format connector. It comes in both single-link and dual-link formats, the difference being that the dual-link connector provides more power và twice the data transmission rate compared to the single-link connector. DVI-D is the most popular type of connector for hooking up DVI cards to lớn LCD monitors. For large screens, the dual-link connector is often a better choice than the single-link connector.
2. DVI-A is the analog format connector. This is the type used khổng lồ connect a DVI thẻ to a CRT monitor (an analog display device). Although the signal does undergo a digital-to-analog conversion, the result is of higher quality than when using a standard đồ họa cable.
3. DVI-I is the integrated format connector. It works with digital và analog equipment, acting as a DVI-D or DVI-A cable, but it won"t convert pure DVI-D đầu ra to analog. DVI-I has two variations—single-link and dual-link—and has a 29-pin layout to accommodate multiple connections.
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Products và prices
People are often constrained by the ports available on their computers. Older PCs may only have a card đồ họa port and new monitors may only have a DVI port. In such cases you may need a đồ họa to DVI adapter to connect this PC và monitor.
It should be noted that you cannot get DVI unique by using a vga to DVI adapter. While some chất lượng issues lượt thích signal degradation in longer đồ họa cables can be avoided by using an adapter near the đoạn phim source, the digital-to-analog conversion necessitated by the vga port does degrade signal quality.
Converters also differ in unique and price. Here are some prices for DVI & VGA accessories (including adapters starting from $5) on Amazon.com:
References
Anonymous comments (2)
July 28, 2013, 11:53pm
There is a lot of misinformation in this article. There is no better way lớn convey a pure RGB clip signal than a pure RGB high-quality analog link. This is what all other technologies are compared to. The DVI standard falls down in lots of ways. It is very confusing and sometimes impossible lớn tell which kind of DVI you have. There is no way of telling for sure. Contrary to lớn what is said here, there is no difference between the DVI-A link and VGA. It is the same thing with a different pinout. The only place where DVI comes out on vị trí cao nhất is when you get khổng lồ higher resolutions, beyond 1080p. The analog links has lớn be carefully implemented lớn preserve the fine detail. But since the pixel clock rate is so high, the DVI links is subject to restrictions as well, such as on cable length. Signal dropouts due khổng lồ cable capacitance cause artiffacts in the display which appear as a sort of sparkling effect which is at least as bad as the degradation in sharpness of a đồ họa analog link.