What ports do GPUs and motherboards use for monitors and TVs?


The monitor or display of a pc is the output peripheral par excellence, by means of it our PC communicates with us and exhibits us in a visible language that we are able to details about what is going on at that second. To join each parts, completely different video outputs have all the time been used, of which we are going to overview.

If you might have ever puzzled why we name PC screens monitors as a substitute of televisions, we’re going to clarify it to you and in case you have simply been left with an incredulous face concerning the relationship between this and the PC inputs and outputs, go away Let us clarify it, since it’s key to understanding the historical past of video inputs and outputs on PC and, due to this fact, its evolutions.

Through the video port the body generated by the GPU is distributed to the monitor display in order that we are able to see it.

Video outputs for monitor and TV

The first computer systems used modified tv screens, that is so as a consequence of the truth that in the course of the Cold War there was a concern that the radio frequency system of those could possibly be modified with computer systems for espionage points or entry to radio communications utilized by again then. This led to pc terminal shows being offered with out the flexibility to tune, however on the similar time allowed the implementation of proprietary video enter and output connectors.

Until the arrival of the PC AT in 1984 that introduced the EGA normal, PC monitors had been modified NTSC tv screens, nevertheless, the constraints of this format when displaying photos with increased definition made the necessity to undertake new codecs PC monitor with a horizontal frequency increased than NTSC 15.7KHz. At that time the trail of televisions and monitors was separated by 20 years till the arrival of monitors and LCD televisions, nevertheless, the distinction stays the identical, the dearth of inclusion of a tv tuner within the monitor.

In this text we are going to speak concerning the evolution of enter and output connectors for monitors and, due to this fact, we are going to concentrate on these discovered on PCs. So we aren’t going to speak, due to this fact, of video outputs equivalent to S-Video, Component, Composite, SCART and many others that we are able to see on the rear panel of many televisions.

Deprecated video outputs

Disused Video Connectors

The connectors on this part are these that you would be able to nonetheless see in lots of computer systems, however as a result of look of extra superior applied sciences, they’ve fallen into disuse. In different phrases, they’ve been changed and they won’t evolve, so if you happen to discover a monitor or a graphics card with this sort of connectors, consider us that it is vitally outdated and it won’t present an appropriate efficiency in the present day.

VGA port

VGA Pinout

Any PC from the 90s and the primary half of the 2000s used the VGA, a video connector of the RGB sort, because it despatched the knowledge of the colour parts in three completely different channels, the connector additionally has the pins to regulate the synchronization horizontal and vertical monitor, which at the moment was managed by the graphics card itself. The synchronization pins point out that it’s a port designed for monitors that use a cathode ray tube to generate the picture.

Being a port for a PC monitor, it doesn’t carry audio and that’s as a result of when the VGA first appeared on the PC, the interior speaker was used or, failing that, the then new sound playing cards to breed the audio and not the monitors. , which, as you will have deduced, had no potential to breed sound.

Due to its analog nature, no person will get together with LCD panels, which led to the necessity to create a digital interface as a way to obtain good picture high quality. The motive why this occurs has to do with the analog-to-digital sign converter that causes the conversion to lose info when utilizing a VGA port.

DVI (Digital Video Interface) port

With the passage of time, LCD panels turned cheaper and customers started to purchase them as a consequence of the truth that they allowed to save lots of area on their desks in comparison with the basic tube monitors. Although the completely different nature of displaying the picture on the display required adjustments to be made to the video outputs on PCs, therefore the start of DVI.

The variations with the VGA? To start with, it assigns two pins to every of the three RGB channels, though regardless of being a digital port it maintains the HSync and VSync pins, however they’re hardly used. Actually it does it with a sequence of pins from the place the monitor sends the details about the decision and the refresh fee, on this method the sending of the sign is self-configured and the use of synchronization pins will not be essential. The first ports that appeared had been the DVI-I, since they’ve the pins for use in analog monitors, nevertheless over time the DVI-D was standardized, which is meant purely for LCD screens because it lacks the pins for the LCD screens. CRT screens.

There had been two completely different generations of the DVI video connector, on the one hand the SL with a most decision of 1920 x 1200 pixels and on the opposite the DL with a decision of 2560 x 1600 pixels additionally at 60 Hz. By the way in which, the DVI by no means supported variable frequency fee and over time it was rapidly changed by HDMI and DisplayPort.

Video outputs in use in the present day

Current video connectors

The video outputs that we’re going to speak about subsequent are those who we are able to discover in graphics playing cards and PC monitors in the present day. The proven fact that the panels are the identical on each flat display televisions and monitors has fully universalized the video interfaces and thus the completely different connectors.

HDMI port

The most used in the present day and with nearly twenty years of evolution has gone from displaying photos to 720p model 1.0 to resolutions 8K with 2.1, which represents a rise of 50 instances extra pixels with respect to its origin. In its evolution we now have seen additions equivalent to assist to numerous facet ratios, variable frequency fee, HDR, and so on.

The HDMI port was born as a variant of DVI, however it doesn’t match in its design and form, in addition to the distribution of the pins. The variations with DVI? Since it was created as a video output for audiovisual content material, it could carry audio and additionally accommodates video for HDCP, the content material safety system nonetheless used in the present day by the audiovisual business.

The HDMI cable is designed to provide the sign with out losses with a distance of as much as 5 meters, a a lot better distance between the output sign and the enter sign finally ends up producing losses within the high quality of the sign, so it will be important hold the PC as shut as potential to the monitor if such a video connector is used.

DisplayPort or DP

The different video connector most utilized in monitors and PC graphics playing cards is named DisplayPort, which, like HDMI, has had a number of completely different generations in its evolution till in the present day. The huge distinction is that they had been born from two completely different standardization committees and that’s the reason DisplayPort is seen extra on monitors than on televisions. Moreover, many instances a great way to know if a display is a tv or a monitor is the inclusion of this port.

The huge distinction between HDMI and DisplayPort other than their form and pin distributions is that HDCP assist for sure content material will not be obligatory in a DP interface, because of this for online game consoles and video gamers this sort of connector It will not be used, as this medium is crucial for the copy of economic audiovisual content material. That is why the DisplayPort has change into a port related to the PC in the present day. However, in contrast to DVI and VGA and additionally like HDMI, DisplayPort has the flexibility to additionally transmit audio.

DisplayPort over USB


The latest of the video outputs is a variant of USB-C, which makes use of its huge bandwidth to transmit the video sign, on the similar time that it’s used to transmit information by means of the USB 2.Zero pins and serve additionally to energy the monitor. It might change into essentially the most used port sooner or later by permitting the display to dispense with the ability adapter and make these change into completely moveable, after all, this can require that the bandwidth exceed HDMI 2.1, which already obtainable with Thunderbolt-based USB 4.0.

At the second it’s a port of minority use, in any case, all the things signifies that the DisplayPort is nearer to extinction than HDMI, because it has all of the numbers to get replaced by USB-C ports with the flexibility to transmit video.