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Multi-monitor, also called multi-display and multi-head, is the use of multiple physical display devices, such as monitors, televisions, and projectors, in order to increase the area available for computer programs running on a single computer system. Research studies^[1][2][3] show that, depending on the type of work, multi-head may increase the productivity by 50–70%.

Implementation[edit]

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Multiple computers can be connected to provide a single display, e.g. over Gigabit Ethernet/Ethernet to drive a large video wall.^[4]

Display modes[edit]

USB[edit]

One way to extend the number of displays on one computer is to add displays via USB. Starting in 2006, DisplayLink released several chips for USB support on VGA/DVI/LVDS and other interfaces.^[5]

Adoption[edit]

In the office[edit]

In many professions, including graphic design, architecture, communications, accounting, engineering and video editing, the idea of two or more monitors being driven from one machine is not a new one. While in the past, it has meant multiple graphics adapters and specialized software, it was common for engineers to have at least two, if not more, displays to enhance productivity.^[6]

In video gaming[edit]

Multi-monitor gaming/simulation is also becoming more common; however, the hardware expense can be a limiting factor.^[7] The rising popularity of using multiple monitors to game is leading to websites being introduced which allow for smooth and easy configuration from outside sources from the original one screen option given by developers to a new multiple screen option.^[8]

Computer games that support multi-monitor set-ups[edit]

Early versions of Doom permitted a three-monitor display mode, using three networked machines to show left, right, and center views.^[9]

More recently, games have used multiple monitors to show a more absorbing interface to the player or to display game information. Various flight simulators can use these monitor setups to create an artificial cockpit with more realistic interfaces.^[10] Others such as Supreme Commander and World in Conflict can use an additional monitor for a large scale map of the battlefield.^[11]

A large number of older games support multi-monitor set-ups by treating the total screen space as effectively a single monitor to the game, a technique known as spanning. Many games without inherent multi-monitor support such as Guild Wars and World of Warcraft can also be made to run in multi-monitor set-ups, with this technique or in conjunction with addition of third-party software^[12] A larger list of games that support dual/multi-screen modes is available at WSGF.^[13]

Arcade machines and handheld console games[edit]

The concept of 'multi-monitor' games is not limited to games that can be played on personal computers. As arcade technology entered the 1990s, larger cabinets were being built which in turn also housed larger monitors such as the 3 28' screen version of Namco's Ridge Racer from 1993. Although large screen technology such as CRT rear projection was beginning to be used more often, multi-monitor games were still occasionally released, such as Sega's F355 Challenge from 1999 which again used 3 28' monitors for the sit-down cockpit version. The most recent use of a multi-monitor setup in arcades occurred with Taito's Dariusburst: Another Chronicle game, released in Japan in December 2010^[14] and worldwide the following year.^[15] It uses 2 32' LCD screens and an angled mirror to create a seamless widescreen.

Nintendo demonstrated the feasibility of playing multi-monitor games on handheld game consoles in designing the Nintendo DS and its successor, the Nintendo 3DS, which both became successful consoles in their own right. Games on these systems take advantage of the two screens available, typically by displaying gameplay on the upper screen, while showing useful information on the bottom screen.^[16] There are also a number of games, mostly for the Nintendo DS, whose gameplay spans across both screens, combining them into one tall screen for a more unique and larger view of the action.^[17]

Developing software for multiple monitor workstations[edit]

Ordinary software does not need special support for multiple screens even if it uses the graphic accelerator. At the usual application level, multihead is presented just as a single larger monitor spanning over all screens. However, some special approaches may increase the multithread performance.

With multiple monitors present, each screen will have its own graphics buffer. One possible scenario for programming is to present to OpenGL or DirectX a continuous, virtual frame buffer in which the OS or graphics driver writes out to each individual buffer. With some graphics cards, it's possible to enable a mode called 'horizontal span' which accomplishes this. The OpenGL/DirectX programmer then renders to a very large frame buffer for output. In practice, and with recent cards, this mode is being phased out because it does not make very good use of GPU parallelism and does not support arbitrary arrangements of monitors (they must all be horizontal). A more recent technique uses the wglShareLists feature of OpenGL to share data across multiple GPUs, and then render to each individual monitor's frame buffer.^[18]

In Android[edit]

Android supports an additional monitor as of version 4.2^[19] but additional software is needed to multi-task/use both at once.^[20][21]

See also[edit]

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References[edit]

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1. ^I. Berger(2006).The Virtues of a Second Screen. New York Times.
2. ^S.Ross (2003).Two Screens Are Better Than One. Microsoft research.
3. ^Z.Davis (2011). Dual Monitors BoostProductivity, User Satisfaction
4. ^'Configuring and Running a Large Video Wall using ATI FirePro Graphics'(PDF). Retrieved 2014-07-04.
5. ^'DisplayLink launches high-speed USB graphics technology for multi-monitor computing applications' (Press release). DisplayLink. April 11, 2006. Retrieved September 17, 2012.
6. ^Bill Gates. April 7, 2006. How I Work. Fortune.
7. ^'When Two Monitors Aren't Enough'. PCWorld. 8 March 2012.
8. ^'Wide Screen Gaming Forum'.
9. ^'Official DOOM FAQ, Section 9.2'.
10. ^'Matrox - Surround Gaming - Flight Sim Zone'. www.matrox.com.
11. ^Supreme Commander Hardware Performance GuideArchived 2011-05-15 at the Wayback Machine, AU Game Spot, February 2007
12. ^'MultiMonitor.Net'.
13. ^'Master Game List'. Archived from the original on 2011-06-23.
14. ^'Dariusburst Another Chronicle Homepage'. 株式会社タイトー.
15. ^'Dariusburst Another Chronicle Now Available Worldwide'. Arcade Heroes.
16. ^Tolito, Stephen (24 October 2016). 'The (Possible) End Of Nintendo's Magnificent Two-Screen Gaming Era'. Kotaku. Retrieved 9 April 2019.
17. ^Tolito, Stephen (19 April 2011). 'The Forgotten Beauty Of Vertical DS Games, The Spectacle Of Widescreen Turned Sideways'. Kotaku. Retrieved 9 April 2019.
18. ^'Hoetzlein, Rama C. Multi-Monitor Rendering in OpenGL'.
19. ^'Android 4.2 APIs - Android Developers'. Android Developers.
20. ^'Ixonos Multi-Display for Android'. November 8, 2013.
21. ^Ixonos Multi-Display for Android on YouTube

Mac Game

Further reading[edit]

• Elliott, John C. (2011-04-24). 'Dual-Head Operation on a Vintage PC'. Archived from the original on 2016-11-23. Retrieved 2016-11-23.

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