XGA+

From Wikipedia, the free encyclopedia

XGA+ stands for eXtended Graphics Array Plus and is a computer display standard. XGA+ is often used on 17 inch desktop CRT monitors. XGA+ is usually understood to refer to the 1152×864 resolution with an aspect ratio of 4:3. As LCD screens are getting increasingly popular, this resolution is decreasing in use, but it is the native resolution of some 17 inch LCD displays.

Historically, the resolution relates to the earlier standard of 1152×900 pixels, which was adopted by Sun Microsystems for the Sun-2 workstation in the early 1980s. This resolution is close to the maximum practical which, using one byte per pixel, can fit into a video memory or frame-buffer of one megabyte. However, its aspect ratio is 3.84:3. When Apple Computer defined a standard resolution for 21-inch CRT monitors, intended for use as Two-Page Displays on the Macintosh II computer, Apple selected instead 1152×864, which is the highest 4:3 resolution below one million pixels.

XGA+ is the next step after XGA (1024×768), although it's not approved by any standard organizations. The next step with an aspect ratio of 4:3 is 1280×960 ("SXGA-") or SXGA+ (1400×1050).

[edit] Comparison chart

Name x
(width)
y
(height)
Pixels
(x1 Million)
Aspect
Ratio
Percentage of difference in pixels Widescreen
Version
Typical screen
sizes
VGA SVGA XGA XGA+ SXGA SXGA+ UXGA QXGA
VGA 640 480 0.31 1.33 0% -36% -61% -69% -77% -79% -84% -90% WVGA
SVGA 800 600 0.48 1.33 56% 0% -39% -52% -63% -67% -75% -85%
XGA 1024 768 0.79 1.33 156% 64% 0% -21% -40% -47% -59% -75% WXGA 15"/ 38cm
XGA+ 1152 864 1.00 1.33 224% 107% 27% 0% -24% -32% -48% -68% WXGA+ 17"/ 43cm
SXGA 1280 1024 1.31 1.25 327% 173% 67% 32% 0% -11% -32% -58% WSXGA 17-19"/ 43-48cm
SXGA+ 1400 1050 1.47 1.33 379% 206% 87% 48% 12% 0% -23% -53% WSXGA+
UXGA 1600 1200 1.92 1.33 525% 300% 144% 93% 46% 31% 0% -39% WUXGA 20"/ 51cm
QXGA 2048 1536 3.15 1.33 924% 555% 300% 216% 140% 114% 64% 0% WQXGA 30"/ 76cm

[edit] References


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