Basic notebook knowledge-detailed description of DVI interface

We have mentioned above, DVI is also divided into several specifications, the DVI-A is actually VGA Interface Standard, just don't change the changes, the current DVI interface is mainly DVI-D and DVI-I two kinds, these two types are further divided into two types: "dual channel" and "Single Channel". What we see at ordinary times is a single channel version, which is costly, therefore, only some specialized devices are available.

In common DVI interfaces, the DVI-D interface can only receive digital signals, the interface only 3 rows 8 columns A total of 24 pins, one of the top right of the pin is empty. Incompatible analog signal.

We may find that there are two kinds of DVI: 18-pin and 24-pin. Some people say that the 18-pin DVI is a simplified version, which is much inferior to the 24-pin version, some people say that the 24-pin DVI has no difference when there are some ground wires. What is the truth?

We have already mentioned that different DVI specifications are classified into two types: "dual channel" and "Single Channel, in fact, the 18 and 24 needles are the differences between these two types. The 18-pin DVI is a single channel, and the 24-pin is a dual channel. That is to say, the DVI transmission rate of the 18-pin is only half of the 24-pin, Which is 165 MHz. On the screen display, the single channel DVI supports the same resolution as the two channels, but the refresh rate is only about half of the two channels, resulting in a decrease in the display quality. Generally, for single-channel DVI interfaces, the maximum update rate can only be 1920*1080*60Hz or 1600*1200*60Hz, that is to say, the current 23-inch wide screen display and the normal display of 20-inch normal proportion display, and then high will cause a decline in the display effect.

Can I buy a 18-pin dvi LCD? The answer is no. At present, most of the Display sizes we use are below 20 inch. To be precise, it cannot be regarded as a large screen LCD, the standard resolution of these displays is within the capability range of 18-pin DVI, unless more than 23 inch of the large screen LCD is purchased, otherwise, there is no need to worry too much about the troubles of 18 or 24 needles.

What if there is no DVI interface but VGA Interface? Don't worry, you can buy a VGA to DVI conversion connector, pay attention to the type of DVI interface.