Information AboutXvga |
| CATEGORIES ABOUT COMPUTER DISPLAY STANDARD | |
| display technology | |
| graphics standards | |
| vesa | |
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Various computer display standards or '''display modes''' have been used in the history of the Personal Computer . They are often a combination of Display Resolution (specified as the width and height in Pixel s), colour depth (measured in Bit s), and Refresh Rate (expressed in Hertz ). Associated with the screen resolution and refresh rate is a display adapter. Earlier display adapters were simple frame-buffers, but later display standards also specified a more extensive set of display functions and software controlled interface. Until recently, most computer monitors had a 4:3 display of two standard letter pages side by side, as well as CAD displays of large-size drawings and CAD application menus at the same time. The VESA industry organization has defined several standards related to Power Management and device identification. Ergonomy standards are set by the TCO . STANDARDS A number of common resolutions have been used with computers descended from the original IBM PC. Some of these are now supported by other families of personal computers. These are de-facto standards, usually originated by one manufacturer and reverse-engineered by others, though the VESA group has co-ordinated the efforts of several leading video display adapter manufacturers. Video ''standards'' associated with IBM-PC-descended personal computers include: There also exist higher standards, such as QXGA and HXGA , with the highest resolution and '' De Facto '' standard resulting from this nomenclature being WHUXGA at 7680 × 4800 pixels. DISPLAY RESOLUTION PREFIXES Although the common standard prefixes ''super'' and ''ultra'' don't indicate specific modifiers to base standard resolutions, several others do: ;Quarter (Q) :A Quarter of the base resolution. E.g. QVGA , a term for a 320×240 resolution, half the width and height of VGA, hence the quarter total resolution. This prefix is usually for "Quad" in higher resolutions. ;Wide (W) :The base resolution increased, and not lowered, for square or near-square pixels on a widescreen display, usually with an aspect ratio of either 16:9 or 16:10. ;Quad(ruple) (Q) :Four times as many pixels compared to the base resolution, i.e. twice the horizontal and vertical resolution respectively. ;Hex(adecatuple) (H) :Sixteen times as many pixels compared to the base resolution, i.e. four times the horizontal and vertical resolutions respectively. These prefixes are also often combined, as in WQXGA . OTHER RESOLUTIONS There are also some other 4:3 ratio resolutions such as 1400x1050 SXGAplus and unnamed ones like 960x768 and 1152x864. SEE ALSO EXTERNAL LINKS |
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