【 Weak current College 】 DVI interface-Power By 【 China power house network 】

DVI Digital Visual Interface known as it is in 1999 by Silicon Image, Intel (Intel), Compaq (Compaq), IBM, HP (Hewlett Packard), NEC, Fujitsu and other companies comprise DDWG (Digital Display Working Group, the digital display working group) launches interface standard. It is based on Silicon Image's PanalLink interface technology, based on the TMDS (Transition Minimized Differential Signaling to minimize the transmission of differential signals) electronic Protocol as basic electrical connections. TMDS is a differential signal mechanism, you can apply a pixel data encoding and delivery over a serial connection. Video produced by the digital signal from the transmitter in accordance with the Protocol encoded by TMDS TMDS channel sent to the receiver, after decoding for digital display device. A DVI display system includes a transmitter and a receiver. Conveyor is signal sources can be built into the graphics chip, or to attach the chip to appear in the video the PCB; while the receiver is a circuit on the monitor, it can receive digital signals, it is decoded and passed to the digital display circuit, through both the video signals into the image on the monitor.
The DVI interface is divided into two kinds, one DVI, can only receive digital signals, the interface is only 3 row a total of 8 columns, including the 24 pin to a PIN at the top right corner of the blank. Not compatible with the analog signal.
Another is the DVI, compatible with both analog and digital signals. Compatible with analog fortunately does not mean that the interface of analog signal can be connected in D-Sub interface DVI, but must pass a subs to use, the general use of such interface graphics will be converted with the associated connection. Considering the compatibility issues, current video card will normally be used DVD-I interface so that you can convert the connector to the ordinary VGA interface. While the display with a DVI interface typically use DVI, because such a monitor with a VGA interface in General also, so there's no need to carry the analog signal of DVI. Of course there are a few exceptions, some monitors only DVI VGA interfaces instead. Display device using DVI interface has the following two major advantages:
«Ò» ¡ ¢ speed
DVI transmits digital signal, digital image information is not subject to any transformation, it will be delivered directly to the display device, thus reducing the numbers → simulation → digital cumbersome conversion process, significant savings in time, so it's faster, eliminate trailing phenomenon, and use the DVI signal for data transfer, without attenuation, the color is purified, more realistic.
2. clear
Computer internal transmission is binary digital signal, using a VGA LCD monitor will need to first put the signal through the video D/A (digital/analog) converter into R, G, B color signals and signal line, the field, the signal transmitted by analogue signal cable to the corresponding LCD internal need of A/D (analog/digital) converter will once again, the analog signal into a digital signal to the LCD displays the image on. In the D/A, A/D conversion and signal transfer process inevitably occur signal loss and interference, cause the image is distorted or even display errors, and DVI interface without the need for these conversions, avoiding the loss of signal, so that the image sharpness and detail have been greatly enhanced. Finally, the DVI interface can support HDCP Protocol, look for the future of high definition video with copyright. But if you want to enable graphics support HDCP DVI interface that does not work, you need to install dedicated chip, to pay the accreditation fees not HDCP-Fei, so there is a real support HDCP Protocol video also.