VGA, DVI, hdmi which is good? What is the difference between three kinds of video signal interfaces?

High-definition TVs are becoming more common at home, and these high-definition TVs mostly have VGA, DVI, HDMI interfaces. The laptop screen is too small, and most people in the office want an external monitor. So understand the difference between these three kinds of video signal interface, is the premise of choosing suitable display.

1, in advance, the following: Three kinds of connectors have a common needle and the difference between the female needle, the purchase of wiring to pay attention to the need for the public needle or female needle.

　　2, VGA connector: needle number of 15 video interface, mainly used for old-fashioned computer output. VGA output and transmission is the analog signal. It is well known that the computer graphics card produces digital signals, and the display uses digital signals. So using the VGA video interface is equivalent to experiencing a analog-to-digital conversion and a one-mode conversion. Signal loss, the display is more ambiguous.

　　3, DVI interface: The DVI interface has two standard, 25-pin and 29-pin, as shown in the following figure. Intuitively, there is no difference between the two interfaces. The DVI interface transmits digital signals, which can transmit large resolution video signals. DVI is connected to the computer's video card and monitor without conversion, so the signal is not lost.

　　4, HDMI interface: HDMI interface transmission is also a digital signal, so in the video quality and DVI interface transmission to achieve the same effect. The HDMI interface is also capable of transmitting audio signals. If the display in addition to the display function, but also with audio, HDMI interface can simultaneously computer video and audio signals to the display. HDMI has three interfaces. Mainly take into account the needs of equipment. such as the small size of the digital camera, the need for a small interface, the use of micro HDMI. Three kinds of interfaces are only different in volume and function the same.

　　VGA, DVI, HDMI mutual conversion instructions

1, VGA and DVI mutual turn: analog signal and digital signal conversion, video signal loss, resulting in distortion. It is better not to convert this way.

2, DVI and HDMI mutual turn: are digital signals, conversion does not happen is true. can be converted. However, when converting from HDMI to DVI, the audio signal is automatically shed.

　　Note: The development experience of video interface is: Vga->dvi->hdmi.