By PURPLELEC | 17 June 2024 | 0 Comments
Introduction to DVI-I and DVI-D interfaces
The DVI interface is a digital interface and is still widely used in many devices. DVI is mainly divided into two interfaces, DVI-I and DVI-D. Let's briefly introduce the differences between various DVI interfaces.
Currently, there are 4 specifications on the market: 18+1 and 24+1, 18+5 and 24+5. As shown in the figure above.
18 pins belong to single-channel DVI, and the transmission rate is only half of that of 24 pins, which is 165Mbps. In terms of screen display, the resolution supported by single-channel DVI is exactly the same as that of dual-channel, but the refresh rate is only about half of that of dual-channel, which will cause a decrease in display quality. Generally speaking, the maximum refresh rate of a single-channel DVI interface can only support 1920*1080*60hz or 1600*1200*60hz, that is, the normal display of the existing 23-inch widescreen monitor and 20-inch ordinary ratio monitor. If it is higher, it will cause a decrease in display effect. If a large-screen LCD monitor is used, a 24-pin dual-channel DVI is a must.
The common 18+5 and 24+5 specifications belong to DVI-I, and the extra 4 lines are used to be compatible with traditional VGA analog signals. This interface is mostly used on display cards, but not on monitors, unless it is a single-interface monitor such as 970P.
If the monitor is lower than 23-inch widescreen or 20-inch ordinary screen, it is completely fine to use 18-pin DVI. Of course, you can use 24-pin, but it is a bit wasteful. In addition, if you want to use a large-screen monitor, a display card with dual-channel output is also very important. Therefore, most graphics cards use DVI-I dual-channel interface, and the performance meets the requirements. In fact, in many cases, DVI can achieve the performance indicators of display cards.
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