What is dvi d on a monitor. The future of dvi and hdmi
In this article we will talk in detail about DVI connector, which can be found in many monitors, televisions and other equipment. Let's delve a little into the history of this popular interface, and also understand its types and features. We’ll also be sure to compare the DVI connector with some progressive interfaces. This information will be useful to many users, and will also simplify the process of working with equipment and avoid various difficulties during operation.
What is DVI output?
A popular connector known as DVI-out (Digital Visual Interface) is intended for high-quality image (video) transmission to various devices digital type. As a rule, these are projectors, monitors and televisions.
This video interface was developed by DDWG. Often on the Internet you can find a transcript of these English letters DVI in the following form is a digital video interface. These words are more understandable for many users who are just beginning to learn about the world of computers and other technology. This connector has a specific color and shape, making it quite easy to distinguish from other outputs. Connecting the device to the different techniques It happens quite simply, without requiring mandatory professional skills.
History of the DVI connector
In 1999, the Digital Display Working Group officially introduced a completely new interface standard at that time called Digital Visual Interface (DVI). Its development was carried out by leading specialists from IBM, Intel, Fujitsu and other well-known corporations who came to DDWG with one goal - to create a truly innovative interface for transmitting digital video signals to monitors and other image output devices.
The advent of DVI marked the end of the era of VGA, which became morally and physically obsolete in 10 years. This allowed not only to improve the quality of content, but also to significantly increase the resolution of displays. It is noteworthy that DVI connectors are still relevant today, although there are already serious rivals that are gradually replacing the “veteran”.
DVI Features
As for DVI, it uses a data format that is based on PanelLink technology. We are talking about the transfer of information that occurs sequentially, as well as originally implemented by Silicon Image. TMDS technology is used here, when signals are transmitted differentially in order to minimize differences in levels. The three channels involved transmit video signals at speeds of up to 3.5 Gbit per second. If you use a cable up to 10 meters in length, you can transmit a picture in FHD format (1920 by 1200 pixels). When to use a longer one connecting cable, then the resolution is “cut down” to HD format.
In some situations, the Display Data Channel (DDC) may be used. With its help it will be possible to convey important information about the display directly to the processor itself, which is installed in the signal source. This includes all detailed data regarding the characteristics of the device. We are talking about the brand, production date, model, size and display resolution. The source will take this information into account, sending a signal with optimal settings for specific screen. If the source does not receive the necessary data, then the TMDS channel may be blocked.
There is support for HDCP, which is an advanced security system. It is also implemented in the more advanced HDMI interface. You can set various levels of content security based on your own needs. The basic principle of HDCP is that devices connected via DVI exchange passwords with each other. This is how internal encryption occurs.
It should be noted that the DVI connector is capable of transmitting only images. As for sound, it is not transmitted to in this case. Therefore, it is necessary to take care of the appropriate channels. It is noteworthy that today there are special adapters for certain video cards that make it possible to simultaneously transmit sound and picture.
Types of DVI outputs
The user may encounter several types of outputs. Among them:
- DVI-A
- DVI-I (SingleLink)
- DVI-I (DualLink)
- DVI-D (SingleLin)
- DVI-D (DualLink)
Therefore, it is easy to guess that the outputs have certain differences. In addition to differences in design, they also have inconsistencies in features. The question is often raised about the difference between Single link and Dual link. There are many differences between them. Both options differ from each other in the number of contacts. The double link uses all twenty-four contacts during operation. A single link, which translates as single, has only eighteen contacts. If the user needs higher resolution, then the first option is more suitable for him. Single link is suitable for devices that have a resolution of 1920 by 1080. With it, users have much less options.
DVI-A output
This output provides only analogue transmission capability. The additional letter allows the user to guess that “A” means analog. The connector is a plug in a cable or adapter that allows you to connect video devices (analog) to a DVI-I type output.
DVI-I output
This connector comes in two types: Single link and Dual link. The first option is very popular and widespread. The additional letter I tells the user that it is integrated. The output is quite often used for digital displays and video cards. Peculiarities of this exit lies in the fact that it combines two transmission channels at once. The device combines digital and analog channels. They do not depend on each other, so they do not work at the same time. The task of the device is to decide independently, thanks to which it will function. The Dual link connector with the letter I transmits an analog signal. It has two whole digital channels. This allows the user to achieve much better image quality and expand their capabilities.
DVI-D output
Here the letter “D” reports the English word Digital, which can be translated – digital. This option does not have an analog channel. With this connector, only digital transmission occurs. As in previous exits, there is a division into single and double. Single link will limit the user a little. The resolution cannot exceed more than 1920 by 1200 (at a frequency of 60 Hz). This option has only one digital channel. The user will not be able to connect an analog monitor and enjoy the technology called nVidia 3D Vision. But Dual link will help you watch 3D on a monitor, increasing the user's capabilities. There are two digital channels here.
DVI-I and DVI-D what is the fundamental difference?
DVI-I supports both digital and analog transmission data, and DVI-D is only digital.
DVI connector compatibility
DVI-A will only be compatible with DVI-A. For transfer analog signal. As for DVI-D, it provides the transmission of only digital video content. It is only compatible with DVI-D. Next we should mention a universal solution that will suit the most different devices. This we're talking about about DVI-I. In some cases, adapters can be used. But this is only possible when it is provided for by the manufacturer of a particular device.
An adapter helps solve the problem, but may affect image quality. There are quite a few types of these devices. The following are available: DVI - HDMI, VGA - DVI and other popular devices. DVI-D and DVI-I cables can operate in dual mode (dual link). In this case, the throughput doubles. For this purpose it is used additional contacts. This solution makes it possible to transmit much more information, which has a positive effect on the frequency and image of the monitor, which become higher. If necessary, use nVidia technology 3D Vision, then a dual link is simply necessary in mandatory. Also, it is worth knowing that large LCD monitors with high resolution are compatible with the DVI-D Dual-Link connector.
DVI output pinout
Comparison of DVI connector with HDMI and Display Port
The primacy among connectors is now held by DP - the display port. It replaced previous developments quite quickly. It has excellent throughput, and the user gets many more new features. The device allows you not to lose quality and also stands out small in size. It has already begun to gradually displace dvi and hdmi. However, not all monitors have exactly the connectors that would fit this new product.
Until changes occur in the system of their production, we will have to wait quite a long time. Most manufacturers are in no hurry to use this device for their equipment. Therefore, even in many modern and popular models you still cannot find DP. Therefore, all is not lost for dvi and hdmi. The latter option does an excellent job of transmitting digital video along with audio. The device can be found in popular and new models of equipment. This interface will help you get high resolution. Every year improved versions appear that not only have excellent throughput, but also give the user much more options. Sound and video do not deteriorate in quality even with a cable length of 10 meters. The dvi connector also remains well-known and in demand. It can be found on many devices, as manufacturers prefer to give it their preference due to its versatility.
We select the required plug for the appropriate connector. What types of cables do manufacturers offer? "HDMI,DVI,VGA,DisplayPort" and which interface is optimal for connecting a monitor.
Previously, to connect a monitor to a computer, they only used analog interface VGA. Modern devices have connectors "HDMI,DVI,VGA,DisplayPort". Let's see what advantages and disadvantages each of the interfaces has.
With the development of new technologies for flat-panel monitors, the connector capabilities have become insufficient VGA. To achieve the highest image quality, it is necessary to use a digital standard such as DVI. Home entertainment device manufacturers have created a standard HDMI, which became the digital successor to the analog Scan connector. Somewhat later, VESA (Video Electronics Standards Association) developed DisplayPort.
Main interfaces for connecting monitors.
■ VGA. The first connection standard, still in use today, was developed in 1987 by a leading manufacturer at the time IBM computers for your PS/2 series PCs. VGA is an abbreviation for Video Graphics Array (an array of pixels), at one time this was the name of the video card in PS/2 computers, the resolution of which was 640x480 pixels (the combination “VGA resolution” often found in technical literature means exactly this value).
An analog data transmission system with increasing resolution only worsens the picture quality. Therefore, in modern computers the digital interface is the standard.
. ■ DVI. This abbreviation is oz-naHaeTDigital Visual Interface - digital video interface. It transmits video signal to digital format while maintaining high image quality.
DVI has backwards compatible: Almost all computers are equipped with a DVI-I connector, which is capable of transmitting both digital video data and a VGA signal.
Inexpensive video cards are equipped with a DVI output in the Single Link modification (single-channel solution). The maximum resolution in this case is 1920x 1080 pixels. (Full HD). More expensive models video cards have a two-channel DVI (Dual Link) interface. They can be connected to monitors with a resolution of up to 2560x1600 pix.
The DVI connector is large enough that Apple has developed a Mini DVI interface for its laptops. Using the adapter, you can connect devices with Mini DVI to monitors equipped with a DVI connector.
connection interfaces
■ HDMI. The abbreviation HDMI stands for High Definition Multimedia Interface, that is, a high-definition multimedia interface. In modern home entertainment devices such as flat-screen TVs and Blu-ray players, HDMI is the standard connection interface.
As with DVI, the signal is transmitted in a digital format, which means original quality. Together with HDMI, HDCP (High Bandwidth Digital Content Protection) protection technology was developed, which prevents the creation exact copies, for example, video materials.
The first devices with HDMI support appeared at the end of 2003. Since then, the standard has been modified several times, in particular, support for new audio and video formats has been added (see table above).
There is an interface for miniature models of equipment Mini HDMI; An appropriate HDMI/Mini HMDI cable is included with many devices.
■ DisplayPort(DP). New type digital interface for connecting video cards with display devices is intended to replace DVI. The current version of the standard 1.2 allows you to connect multiple monitors when they are daisy-chained into one chain. However, currently there are not many devices with a DP port. As a direct competitor to HDMI, this interface has a significant advantage from the point of view of manufacturers: it does not require licensing fees. While for each device with HDMI you have to pay four American cents. If the connector on a computer or laptop is marked “DP++”, this indicates that the adapter can be used to connect monitors with DVI and HDMI interfaces.
To ensure that there is enough space on the back of modern video cards for connectors for other purposes, a smaller version of the DP interface was developed. For example, video cards Radeon series HD6800 contain up to six Mini DP ports.
HDMI,DVI,VGA,DisplayPort
Which of these standards will be most widely adopted? HDMI has a very high chance of success, since most devices have this interface. However, Asian manufacturers have a new trump card in their deck: according to official data, the Digital Interactive Interface for Video and Audio(DiiVA) provides a throughput of 13.5 Gbps (DP: 21.6; HDMI: 10.21. In addition, as the companies promise, the maximum cable length between devices, such as a Blu-ray player and a TV, will reach 25 m. There is no information yet about what the DiiVA interface looks like.
Transfer video via USB
Two years ago it became possible to connect monitors via USB using DisplayLink adapters. However, due to the low (480 Mbps) bandwidth, the USB 2.0 connection is not suitable for video transmission. Another thing - latest version USB standard(3.0), providing data transfer rates up to 5 Gbit/s.
An adapter from DisplayLink allows you to connect monitors directly to a computer's USB port.
How to connect a computer and a monitor with different interfaces.
Thanks to adapters, there are many connection options (see table below).
Common adapters, such as DVI-I/VGA, have a very reasonable price. So-called converters that convert the digital DisplayPort output signal into an analog VGA signal are much more expensive.
However, for example, when connecting a TV with an HDMI interface to the DVI connector, there is almost always no sound.
Is it possible to combine devices with different versions HDMI
With this combination, only the functions of the earlier version of the corresponding interface will be available. For example, if a video card with HDMI 1.2 is connected to a 3D TV that supports HDMI 1.4, then 3D games will only be displayed in 2D format.
Advice. Installing a new driver allows you to add support for HDMI 1.4 in some video cards based on NVIDIA chips, for example GeForce GTX 460.
What connectors provide best quality images?
Testing has shown that the analog VGA interface provides the worst image quality, especially when transmitting signals with a resolution of more than 1024x768 pix. Even 17-inch monitors support this resolution today. Owners of monitors with a larger diagonal and a resolution of 1920x1080 pixel are strongly recommended to use DVI, HDMI or DP.
How to connect a monitor to a laptop?
Most laptops are equipped with connectors for connecting external monitors. First, connect the monitor to the laptop. After that, using the Ш and KPI buttons, you can switch between the following modes.
■ Using an external monitor as the main one. The laptop display turns off and the image is displayed only on the connected external monitor. The best option for movie buffs and gamers.
Clone mode. External monitor and laptop display show the same image
■ Practical for presentations and seminars.
■ Multi-screen mode. Allows you to increase the size of the Worker Windows desktop through the use of multiple monitors. It is very convenient, for example, when typing text in Word, to have email messages in front of your eyes.
Will it be possible to connect the TV to the computer?
Modern computers and laptops do not have analog video interfaces such as S-Video or a composite connector. Therefore, you definitely won’t be able to connect an old CRT TV. However, the vast majority of flat-panel models are equipped with DVI or HDMI interfaces, which means connecting them to a computer is not difficult.
Netbooks, as a rule, only have a VGA output, and only those TVs that have a VGA input can be connected to them.
Is it possible to connect a monitor via USB
For traditional monitors this is only possible using an optional DisplayLink adapter. However, there are also models on sale that connect directly to a computer’s USB port - for example, Samsung SyncMaster 940 UX.
What is the maximum monitor cable length?
Cable capabilities depend on the connection type. When using DVI, the connection length can reach 10 m, but in the case of HDMI and VGA it should not exceed 5 m. To achieve maximum transfer speed.
What should you pay attention to when purchasing a video cable?
To those located nearby electronic devices did not affect the quality of the transmitted signal, purchase only well-shielded cables. When using a low-quality cable, other devices may cause interference and in some cases even reduce the data transfer rate. As a result, the screen will display a choppy image or an aliasing effect will appear. Gold-plated contacts prevent corrosion of the plugs due to high air humidity. In addition, the gold-plated contacts used in modern cables reduce the resistance between the connector and the plug, which improves transmission quality. But as you can see from practice: you can forget about all this, gold-plated contacts and other nonsense, cheap cables made in China, namely, they are supplied complete with monitors and video cards. And they cope with their responsibilities very well.
For reference: once somewhere they gathered music lovers to test cables. There were both gold-plated and platinum contacts, from $1000 per cord and much more. Well, the ratings were given for sound quality. To determine the winner, the competition was held naturally in the dark, the manufacturer was not visible. Well, one of the organizers came up with the idea of sending a signal through an ordinary iron crowbar (which is used to hammer the ground). And what do YOU think, he took one of the prizes.
And music lovers spent a long time explaining what crystal clear sound comes through this cool cable. So turn on your head, otherwise I saw the guys have a cable DVI at a price higher than the video card and monitor combined.
Types DVI connectors and their technical characteristics
Many people have a problem correct definition and selecting the required adapter for a video card or monitor. To make this task easier, we present to your attention a table of differences indicating the type of DVI connectors, as well as information about their technical characteristics.
Types of DVI
DVI-A is analog transmission only.
DVI-I - analog and digital transmission.
DVI-D is digital transmission only.
Video cards with DVI-A do not support monitors that comply with the DVI-D standard.
A video card with DVI-I can be connected to a DVI-D monitor (with a cable with two DVI-D-male connectors).
A DVI-I to VGA adapter exists.
DVI-D adapter to VGA with video transmission function does not exist, only special converters that have a high cost (from 35 USD). Technological technologies are available for sale DVI-VGA adapters, which serve other purposes and are not suitable for video signal conversion.
Specifications
The data format used in DVI is based on PanelLink, a serial data format developed by Silicon Image. Uses technology high speed transmission TMDS digital streams (Transition Minimized Differential Signaling, differential signal transmission with minimization of level differences) - three channels transmitting video and additional data streams, with a throughput of up to 3.4 Gbit/s per channel.
The maximum cable length is not specified in the DVI specification because it depends on the amount of information being transferred. The 10.5 meter cable can be used to transmit images with a resolution of up to 1920 x 1200 pixels. Using a cable 15 meters long it will be possible to transmit an image in normal quality with a resolution of 1280 x 1024 pixels. To amplify the signal when transmitting over long cables, they are used special devices. When using them, the cable length can be increased to 61 meters (in the case of using an amplifier with its own power supply).
Types of DVI connectors
Single link DVI uses four twisted pairs s wires (red, green, blue, and clock) providing the ability to transmit 24 bits per pixel. With it, the maximum possible resolution of 1920x1200 (60 Hz) or 1920x1080 (75 Hz) can be achieved.
Dual link DVI doubles the bandwidth and allows for screen resolutions of 2560x1600 and 2048x1536. Therefore, for the largest LCD monitors with high resolution, such as 30" models, you definitely need a video card with a two-channel DVI-D Dual-Link output. If the monitor maximum resolution screen 1280x1024, then connect it with a cable dual link does not make sense, because this cable is intended for monitors with higher resolutions.
Source of information -
The DVI connector is used in modern TVs(plasma, liquid crystal), LCD monitors and video cards of personal computers. The name "DVI" comes from the English abbreviation Digital VisualInterface, which translates as "digital video interface". The DVI connector was developed and first introduced back in 1999 by the Digital Display Working Group. It includes global manufacturing giants computer equipment and monitors such as Intel, Compaq, Fujitsu, Silicon Image, Hewlett Packard and NEC. The DVI connector replaced the VGA interface and today has almost completely replaced it.
Description of DVI technology
The method used in this interface was developed by Silicon Image. It is a type of serial communication device. The DVI cable is built on the twisted pair principle. Three pairs of wires carry colors (red, green and blue), and the fourth carries signals clock frequency. The DVI connector allows you to transmit both analog and There are three subtypes of the interface in question:
- DVI-A - used for transmission exclusively;
- DVI-I is a universal connector, used for transmitting both analog and digital signals;
- DVI-D - for transmitting digital signals only.
In addition, DVI technology is equipped special system protection digital information HDCP, which was developed by Intel.
Disadvantages of the DVI interface
The main disadvantage of transmitting information through this connector is the limitation of the cable length, as well as the dependence of the mentioned parameter on the type of signal being transmitted. For example, an image with an extension of 1920x1200 pixels with a frequency of 60 Hz can be transmitted over a cable whose length is 5 meters, and a signal can be transmitted over a fifteen-meter cable, maximum quality which will be only 1280x1024 pixels at the same frequency. Therefore, if it is necessary to use long cables, you have to use additional equipment- special signal amplifiers (repeaters), which are installed at certain distances. This disadvantage is associated with the appearance of dots on the monitor when using a low-quality cable. To eliminate this effect, you must either change the cord or reduce the quality of the input signal.
DVI-HDMI connector
This digital connector is used to transmit HDTV signals. Designed for connecting TVs to various sources signals. The peculiarity of the mentioned connector is that through it you can transmit not only a video signal, but also digital audio. It allows you to broadcast 8 audio channels with a bit depth of 24 bits. There are various specifications of the designated interface, as well as adapters, thanks to which you can connect different types of connectors. An HDMI connector can also be used to connect personal computer and TV. It should be remembered that the HDMI-DVI interface supports a special protocol designed to protect licensed content from unauthorized overwriting.
Conclusion
Despite the fact that DVI technology has almost completely replaced VGA interfaces, today this type is quite widely used on older PCs. If your video card does not have a DVI connector, but you still need to connect a monitor that supports this technology, then you can use a special adapter - a DVI-VGA connector.
To transmit video signal to digital form A DVI (digital visual interface) connector is used. It was created when video media appeared in digital format - DVDs, and when it was necessary to transfer video from a computer to a monitor. The then existing methods of transmitting an analog signal did not allow achieving high quality pictures, because physically transmit an analog signal high resolution at a distance is impossible.
Video distortion can always occur in the communication channel, this is especially noticeable on high frequencies oh, and HD quality just implies the presence of high frequencies in the signal spectrum. To avoid these distortions, we tried to switch to a digital signal and abandon analog when processing and transmitting video from the media to the display device. Then, in the late 90s, several companies joined forces to create a digital interface for transmitting video data, eliminating DAC (digital-to-analog) and ADC (analog-to-digital) converters from the path. The result of their work was the creation of the video signal transmission format - DVI.
Appearance of dvi connector:
View of the dvi connector inside:
Basic parameters of the dvi interface
This type of connection transmits information about the main components of the RGB signal (red, green, blue). Each component uses a separate twisted pair in the DVI cable, and there is a separate twisted pair cable for transmitting synchronization signals. It turns out that the DVI cable consists of four twisted pairs. A twisted pair connection allows you to use the principle of differential data transmission, when the interference has a different phase in each conductor and is subtracted at the receiver, but this technical features and it is not necessary to know them. Each color component is allocated 8 bits, and, in general, 24 bits of information are transmitted to each pixel. Maximum speed data transfer reaches 4.95 Gbit/s, at this speed it is possible to transmit a signal with a resolution of 2.6 megapixels at a frame rate of 60 Hz. An HDTV signal, whose resolution is 1980x1080, has a resolution of slightly more than 2 megapixels, so it turns out that a high-resolution signal of 1980x1080 at 60 Hz can be transmitted through the DVI connector. There is only a limit on the cable length. It is believed that a high-resolution signal can be transmitted with a cable up to 5 meters long, otherwise distortion may occur in the image. When transmitting a signal with a lower resolution, increasing the length of the DVI cable is allowed. It is also possible to use intermediate amplifiers, if you still need a longer length to transmit the video signal.
For greater compatibility, the DVI connector was made to support an analog signal. This is how three types of DVI connectors appeared:
- 1) DVI-D transmits only digital signal;
- 2) DVI-A transmits only analog signal;
- 3) DVI-I is used to transmit both digital and analog signals.
The connector itself is the same for all three types, so they are completely compatible, only they have a difference in the connected contacts in the connector.
There are also two data transfer modes: single link (single mode), dual link (double mode). Their main difference is in the supported frequencies. If in single mode the maximum signal can be 165 MHz, then in dual mode restrictions are imposed physical characteristics cable. This suggests that DVI Dual Link cables can transmit a signal with higher resolution and to long distances. That is, if, when using a single link cable, there is interference in the image of the LCD TV in the form of colored dots, then you can try replacing it with a dual link. DVI cable design dual mode It is distinguished by the use of double twisted pairs to transmit color components.
Features of the dvi connector
To implement such speeds, a special TMDS coding method. And in any DVI connection, a TMDS transmitter is used on the transmitting side for encoding, and the RGB signal is restored on the receiving side.
Additionally can be used in DVI interface DDC channel (Display Data Channel), which provides the source processor with EDID display information. This information provides details about the display device and includes information about the brand, model number, serial number, release date, screen resolution, screen size. Depending on this information, the source will produce a signal with the required resolution and screen proportions. If the source refuses to provide such information, it may block the TMDS channel.
Same as HDMI interface DVI supports HDCP content protection system. Such a protection system is called intelligent protection and it is called so because of its implementation and the ability to set different levels of protection depending on the different cases, so this protection does not block normal data exchange (for example, when copying). It is implemented on the principle of exchanging passwords with all devices connected via DVI.
Only the image is transmitted through the DVI connector, and the sound will have to be transmitted through additional channels. Some video cards have the ability to transmit audio over dvi cable, but for this purpose special adapters are used and this possibility is additionally implemented in the video card itself. And then it is no longer a pure DVI interface. At normal connection Sound needs to be transmitted additionally.
