QXGA

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The QXGA, or Quad eXtended Graphics Array, display standard is a resolution standard in display technology. Their high pixel counts and heavy display hardware requirements mean that there are currently several CRT monitors, but few LCD monitors which have pixel counts at these levels. These terms are currently relegated to the highest-end consumer computer display hardware for those buying LCD. However, CRT monitors offer QXGA at a fraction of the price of LCD as of 2007 ^[1].

An example of a WQXGA display can be found in the 30" Apple Cinema Display, which requires a Dual Link DVI. As of this date, there are few WQUXGA displays in the consumer marketplace, but their price is higher than most displays used by graphic professionals, and their refresh speed is not close to that used in current consumer displays. It is unlikely that WQUXGA or next-generation, HXGA, displays will be commonplace anytime soon. It should also be noted, however, that many standard 21" / 22" CRT monitors can be used at the QXGA resolution.Some higher-end 19" CRTs can also be used at this resolution.

Computer Standard	Resolution	Ratio	Pixels
QXGA	2048×1536	4:3	3.1M
WQXGA	2560×1600	16:10	4.1M
QSXGA	2560×2048	5:4	5.2M
WQSXGA	3200×2048	25:16	6.6M
QUXGA	3200×2400	4:3	7.7M
WQUXGA	3840×2400	16:10	9.2M

1 QXGA
2 WQXGA
3 QSXGA
4 WQSXGA
5 QUXGA
6 WQUXGA
7 References

[edit] QXGA

QXGA (Quad eXtended Graphics Array) is a display resolution of 2048×1536 pixels with a 4:3 aspect ratio. The name comes from the fact that it has four times as many pixels as an XGA display. As of 2005, this is the highest non-experimental and non-widescreen resolution, and the number of monitors that can display images at this resolution are somewhat limited, especially among LCD's. The number of CRT monitors offering this resolution has actually dropped off, as CRT makers such as NEC and Sony have stopped offering their higher end models. Examples of LCDs with this resolution are the IBM T210 or the Eizo G33 and R31 screens, but in CRT monitors this resolution is much more common; some examples include the ViewSonic G225fB, Samsung 1100MB, Iiyama Vision Master Pro 514, and HP P1130. A related display size is WQXGA, which is a wide screen version. CRT's offer a way to achive QXGA cheaply. Models like the Mitsubishi Diamond Pro 2045U and IBM ThinkVision C220P retailed for around 200 USD, and even higher performance ones like ViewSonic PerfectFlat P220fB remaining under 500 USD. The LCD's with WQXGA or QXGA resolution typically cost 4 to 5 times more for the same resolution.

[edit] WQXGA

WQXGA (Wide Quad eXtended Graphics Array) is a display resolution of roughly 2560×1600 pixels with a 16:10 aspect ratio. The name comes from the fact that it is a wide version of QXGA, which in turn has four times as many pixels as an XGA display. As of 2006, there are still very few devices that can render images at this resolution. Several mainstream WQXGA monitors are available with 30 inch displays, such as the Apple Cinema Display, the Dell UltraSharp 3007WFP, the Hewlett-Packard LP3065, and the Samsung 305T. (In marketing materials, Dell expands the abbreviation to "Wide Quantum Extended Graphics Array.") Specialist manufacturers like Planar Systems, Barco and possibly others offer similar models.

Since XGA displays have a resolution of 1024×768 and QXGA displays have a resolution of 2048×1536, a 2560×1600 display resolution is actually slightly taller than QXGA in addition to being wider. A resolution of 2560×1536 should, in theory, also qualify as WQXGA, if such a display were to be made. Apple has historically chosen 16:10 aspect ratios for most of its wide screens, even when this has meant opting for slightly higher resolutions than might otherwise be arrived at.

[edit] QSXGA

QSXGA (Quad Super Extended Graphics Array) is a display resolution of roughly 2560×2048 pixels with a 5:4 aspect ratio. Grayscale monitors with a 2560×2048 resolution, primarily for medical use, are available from Planar Systems (Dome C5i), Eizo (Radiforce G51), Barco (Nio 5MP), IDTech (IAQS80F) and possibly others.

[edit] WQSXGA

WQSXGA (Wide Quad Super Extended Graphics Array) describes a display standard that can support a resolution up to 3200 x 2048 pixels, assuming a 1.56:1 (25:16) aspect ratio. As of early 2007, no monitor natively capable of this resolution is available.

[edit] QUXGA

QUXGA (Quad Ultra Extended Graphics Array) describes a display standard that can support a resolution up to 3200 x 2400 pixels, assuming a 4:3 aspect ratio. As of early 2007, no monitor natively capable of this resolution is available.

[edit] WQUXGA

WQUXGA (Wide Quad Ultra Extended Graphics Array) describes a display standard that can support a resolution up to 3840 x 2400 pixels, assuming a 16:10 aspect ratio.

This resolution is exactly four times 1920x1200 and was released as a product in June 2001 by an IBM display panel built into the IBM T220 LCD monitor, IBM T221 (models DG1, DG3, DG4, DG5), Iiyama AQU5611DTBK, ViewSonic VP2290b ^[2], ADTX MD22292B and IDTech MD22292 (models B0, B1, B2, B5, C0, C2; all other brands are in fact relabled IDTech models, IDTech does not sell these monitors^[3]). Most display cards with a DVI connector are capable of supporting the 3840x2400 resolution. However, the maximum refresh rate will be limited by the number of DVI links that are connected to the monitor. 1, 2, or 4 DVI connectors are used to drive the monitor using various tile configurations. Only the IBM T221-DG5 and IDTech MD22292B5 support the use of dual-link DVI ports using an external converter box.

Most systems using these monitors use at least 2 DVI connectors to send video to the monitor. These DVI connectors can be from the same graphics card, different graphics cards, or even different computers. Motion across the tile boundary(ies) can show tearing if the graphics card(s) are not synchronized. The display panel can be updated at a speed between 0Hz and 41Hz (48Hz for the IBM T221-DG5, and IDTech MD22292B5). The refresh rate of the video signal can be higher than 41Hz, or 48Hz, but the monitor will not update the display any faster if graphics card(s) do so.

As of January 2007 none of the WQUXGA monitors are still in production (IBM, Viewsonic, Iiyama, ADTX). The highest-resolution color displays on sale are WQXGA. The first company to ship such was Apple with its 30-inch Cinema HD Display^[4] in June 2004; Dell and Samsung followed later in spring and fall 2006 respectively.

[edit] References

Computer display standards v • d • e	Size comparison
Video hardware
MDA \| Hercules \| CGA \| EGA \| VGA \| MCGA \| 8514 \| XGA
Display resolutions
QQVGA \| QVGA \| VGA \| SVGA \| XGA \| XGA+ \| SXGA \| SXGA+ \| UXGA \| QXGA \| QSXGA \| QUXGA \| HXGA \| HSXGA \| HUXGA
Widescreen variants
WXGA \| WSXGA/WXGA+ \| WSXGA+ \| WUXGA \| WQXGA \| WQSXGA \| WHXGA \| WHSXGA \| WHUXGA \| WQUXGA