Tel: +86-519-8657 4136
Home > Product Info > Content

DVI vs HDMI

DVI vs HDMI


Misunderstanding

1, Error: the DVI and HDMI differ greatly

Under the existing circumstances, the same resolution, the image quality of the two interfaces DVI and HDMI no significant difference, but with the development of the HDMI interface, a DVI interface to provide more specific functionality.

2, errors: HDMI interface may transmit audio signals, DVI does not transmit audio signals

It is found from the above DVI pin definition, there is no use of empty data pins. The 4,5,12,13,20,21 These pins, card manufacturers can use these empty needles transmission of audio signals. But because the DVI standard does not define a special pin to transmit the audio signal, so this is the manufacturers themselves do a set of things, different standards between different vendors and each other is not universal. Also, because most vendors prefer to use advanced HDMI interface to transmit audio, DVI can transmit audio functions basically abandoned.

Advantage HDMI

HDMI 1.3 version:

1. Added support for new lossless compressed digital audio formats Dolby TrueHD and DTS-HD Master Audio ™ in.

2, a higher refresh rate: 1920x1080 resolution in the same pattern, HDMI 1.3 165Hz refresh rate than the dual-channel provides DVI interface 120Hz refresh rate higher.

HDMI 1.4 version:

1, Ethernet Channel: HDMI 1.4 specification increases the data path in the cable, to achieve high-speed bi-directional transmission. Appliances are functional in the link, the available Ethernet line rate 100Mb / s transmission and reception of data, and the devices become instantly IP-based devices. HDMI Ethernet Channel will allow an Internet-enabled HDMI devices without a separate Ethernet cable, you can share its Internet connection with other HDMI devices. This new feature also provides interconnect architecture between HDMI devices to share content you want.

2, higher resolutions: support 3840 × 2160 24Hz / 25Hz / 30Hz; 4096 × 2160 24Hz resolution. The new specification supports a resolution of 4096 × 2160, so that the HDMI interface to transmit content at the same resolution as many digital cinema employed. The dual-channel DVI interface can only support up to 2560x1600 resolution.

How to choose the DVI interface DVI interface and what are the advantages

DVI interface advantages mainly in the following two aspects:

1, fast: the DVI transmission is a digital signal, digital image information without undergoing any change, it will be directly transferred to the display device, thereby reducing the analog digital → → cumbersome digital conversion process, saving time, thus it's faster, effectively eliminating the smear phenomenon, and the use of DVI data transmission, the signal does not decay, the color is more pure, more realistic.

2, the picture is clear: a computer-internal transmission of binary digital signals, a VGA interface of the liquid crystal display, you will need to first signal by the video card in the D / A (digital / analog) converter into R, G, B three primary color signals and horizontal and vertical sync signals that are transmitted through the internal analog signal lines to the liquid crystal needs a corresponding a / D (analog / digital) converter converts an analog signal into a digital signal once again in order to display an image on the LCD. Inevitably appear in the above-described D / A, A / D conversion and signal transmission interference and signal loss, resulting in image distortion or error, and the DVI interface without the need for such conversion, to avoid loss of signal, so that expressive clarity and detail of the image have been greatly improved.

In Edge Blending system will basically collect used dual VGA signal capture card or dual-link DVI signal, then we elaborate on the following aspects related issues when selecting DVI Dual Capture Card should be noted:

DVI is a digital signal is not the true sense of the architecture, DVI digital signal architecture acquisition card, VGA capture card is much higher in relation to research and development difficult, so we must pay attention to is not selected to do a simple VGA card on to DVI interface module, rather than true architecture pure digital DVI capture card.

② the development of technical limitations, to be included VGA DVI capture card capture card can capture technology threshold will be high and the non-output graphics card discrete graphics output in the selection of such products must pay attention to distinguish to see whether support.

③ whether the on-board cache, this is very important, many key performance capture cards require an onboard cache to improve.

DVI dual capture card , two cards is not a simple replication, is necessary to actually combined two DVI capture card, a card slot two, simultaneous acquisition of two DVI signals, and the parameters can be adjusted independently, can not influence each other not exactly two cards in order to use the same set, can not set another one influence, but also pay attention to discrimination in the selection.

⑤ software applications to be relatively simple, since DVI-way acquisition card belonging to the collection of non-standard image signal, many parameters need to debug, so the design of the software to be conducive to beginners smooth commissioning and fast to achieve the best results