Digital Visual Interface: High Quality Digital Display

Such digital interface will allow the possibility of producing high quality advanced technology televisions and projectors

. The digital visual industry has undergone tremendous development due to the introduction of Digital Display Working Group (DDWG) and also the DVI technology, evolving the LCDs to computer monitors as well as the projectors.

Speaking of such necessities, we should take an in-depth view into the digital technology evolution. Before such technology was introduced, the standard visual devices were using the Video Graphics Array (VGA) and were intended to be used on CRT monitors as well. This technology involved a source that produces horizontal lines to create images. At the same time, it can change to output voltage corresponding to the level of brightness. When the CRT receives the transmission, it will change the electron beam and scan the display monitor. Nevertheless, this approach proves no effect on digital displays as every pixel needs to be sampled to generate an accurate display.

With the digital video interface technology, such distortions are no longer causing a problem. Instead of carrying out adjustments onto the output voltage to resolve the brightness, it will take the brightness and insert an individual binary code into every pixel. This method will ensure a perfect matching between the pixels in the source with those in the display. Then the screen in display will be free from any distortion and noise.

Basically the DVI applies the configuration format based on the Pixel Serial that utilizes the Transition Minimized Differential Signaling (TMDS). All the wires colored in green, blue, red and one a clock signal are responsible for transmitting 24 bits to every pixel. The picture images will be sent in every single line in intervals without any packet forms. Besides, this technology also does not involve any compression which has been an ongoing problem affecting former technologies.

A single digital video interface link can support up to 2.6 megapixels at 60Hz speed but if the resolution is much higher, it is capable of using other links. There are two link modes involved; the single link for displays requiring less than 2.6 megapixels while dual link require more than 2.6 megapixels or 24 pixel bits. Unlike the Open LDI and LDVS, this technology also provides the support for analogue and digital transmissions. The connectors are divided into few categories: DVI-I for both digital and analogue, DVI-A for analogue only and DVI-D for digital only. In some cases, the DVI-D can function along with the High Definition Multimedia Interface (HDMI).

The minimum frequency required for DVI concept is 25.175 MHz while the maximum will be 165 MHz. However, the limit will be set by the cable for the dual link mode. The pixel for every clock cycle is 1 for single mode and 2 for dual link. The usual bits per pixel used are 24 and in dual mode, it will be 48.

Digital Visual Interface: High Quality Digital Display

By: Chris Cornell

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