Glossary
Addressability | The number of horizontal and vertical |
| picture elements (pels) in the image. |
| The higher the addressability, the |
| more detailed the image that can be |
| displayed on the screen. |
| (Addressability is sometimes referred |
| to as resolution). |
DDC | Display Data Channel. A VESA |
| Standard enabling ‘Plug and Play’. |
Display Mode | The way in which the image generated |
| by the computer is displayed on the |
| screen. It is defined primarily by refresh |
| rate and addressability. |
DPMS | Display Power Management Signalling. |
| A VESA Standard. |
EPA | US Environmental Protection Agency, |
| responsible for the ‘Energy Star’ power |
| conservation program. |
Horizontal | The number of horizontal lines drawn |
Frequency | across the screen by an electron beam |
| in one second. Measured in kHz. |
Interlaced | An interlaced display mode causes the |
| electron beam to refresh the screen |
| image in two passes. One pass scans |
| the even lines, the next pass scans the |
| odd lines. |
ISO | International Organisation for |
| Standardisation, responsible for the |
| ISO 9241 (part 3) Standard for |
| Computer Systems. |
A | |
| the electron beam to refresh the screen |
| image in one pass. |
NUTEK | Swedish National Board for Industrial |
| and Technical Development, involved |
| in producing power consumption |
| guidelines. |
Refresh Rate | The number of times per second the |
| Frequency screen image is “repainted”. |
| Measured in Hz. The higher the (non- |
| interlaced) vertical frequency, the less |
| the flicker. |
Resolution | See Addressability. |
SVGA | Super Video Graphics Array. Video |
| Modes with 800 x 600 or higher |
| addressability. |
VESA | Video Electronics Standards |
| Association, responsible for defining |
| display mode, DPMS and DDC |
| standards. |
VGA | Video Graphics Array. Video standard |
| with 640 x 480 addressability. |
XGA | Extended Graphics Array. Video |
| standard with 1024 x 768 |
| addressability. |
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