Friday, 23 January 2015


There are so many different types of analog and digital connectivity options available on a display which leads to a hell lot of confusion regarding how to differentiate between them on various parameters like bandwidth,resolution,etc.
Here are 4 of the most popular signal standards and their respective connectors.


Video Graphics Array (VGA) is a signal standard with its connector sharing the same name. It is considered outdated now because it carries analog signal (even though it supports a resolution of 2048 x 1536). It is also known as DE-15 because it has 15 pins. As it has been almost 3 decades since it came into being most of the top companies like Intel,AMD,Dell,etc have decided to phase out this interface.


DVI was the successor of VGA since it was both digital and analog which made it compatible with older VGA interface.It consists of 29-pin package and has an amazing bitrate of 3.96 Gb/s in single link mode. DVI supports multiple modes such as digital only, analog only and digital plus analog. The single link employs a lone 165Hz transmitter that supports a resolution upto 1920 x 1080 @ 60Hz but the dual link mode makes use of a second transmitter with 6 additional pins and supports a resolution of 2560 x 1600 @60Hz.


 In order to throw out analog,big companies came together to create High Definition Multimedia Interface(HDMI). It provided a compact and functional interface for transferring uncompressed digital video data and compressed and uncompressed digital audio data. The key difference between HDMI, VGA and DVI is that HDMI lacks VGA compatibility but most HDMI devices support DVI-D signalling. HDMI 1.4 with 19 pin connector is capable of supporting 4096 x 2160 @ 30Hz.


The ultimate digital video transmission interface,it depends on packetised data transmission like the one used by Ethernet. It means it can transmit very high quality uncompressed content through fewer pins. DisplayPort version 1.3 now enables transmission at a whopping bandwidth up to 32.4Gb/s.

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