Monitor technology

Published on 12/06/2015 by admin

Last modified 12/06/2015

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5 Monitor technology

Aspect Ratio	The ratio of the width of a display screen to the height, e.g. 4 : 3
Bezel	The plastic or metal frame round a display screen
Brightness (Luminance)	The amount of light a LCD monitor produces in candela (cd) per square metre (m²), e.g. 250 to 350 cd/m²
Colour Depth	The number of bits used to give the colour of one pixel, and gives the number of different colours that can be displayed at one time, e.g. • 1 bit depth gives 2 colours (black and white) • 16 bit depth gives 65 563 colours that can be displayed • 24 bit depth gives 16.8 million colours that can be displayed
Contrast Ratio	The difference in intensity between the black and white on an LCD screen • The higher the contrast ratio the better the detail
Cursor	A flashing marker on the screen which indicates where the next character is to be inserted
Dot Pitch	A measure of the sharpness or resolution of a screen • DPM – dots per millimetre • The higher the figure the better the resolution of the screen as the dots are closer together
LCD	Liquid Crystal Display monitor
Monitor	A device very similar to a television, but which receives video signals directly from the computer
Native Resolution	The optimum resolution of a LCD monitor. If this is changed the image quality diminishes Examples of native resolution: • 17 inch screen = 1024 × 768 • 20 inch screen = 1600 × 1200
Pixel	Picture cell. A pixel is the smallest number of dots which can be used by a character on the display screen
Refresh Rate	Number of times the monitor is scanned by the electron beam per second • The higher the refresh rate the less screen flicker • A refresh rate of 85 Hertz means the screen is scanned 85 times each second
Resolution	The number of ‘dots’ on a monitor screen defines the resolution of a system by describing the number of pixels horizontally and vertically, e.g. 1200 × 1200 gives a resolution of 1200 separate points horizontally and vertically
RGB Input	The colour input on a monitor. The signal from the computer is taken by the monitor as a basic Red, Green and Blue input
Screen Size	Cathode ray tubes • The diagonal measurement from the outer corners of the casing Liquid Crystal Display screens • The diagonal measurement from the corners of the screen
Scrolling	The movement of text or data on the display screen. Scrolling can be upwards, downwards or sideways
Thermionic Emission	The release of electrons when a substance is heated
VDU	Visual display unit
Viewing Angle	The maximum horizontal and vertical angle that a monitor screen can be viewed at to give a clear image with accurate colours, e.g. • 120° • 170°
Voxel	A three-dimensional pixel
Interlacing	Consider one still picture on a cathode ray monitor (Figs 5.1, 5.2) • The picture is made up of two fields which consist, in a 625 line system, of 312.5 lines each • Each horizontal line is made up of minute dots (pixels) • The picture is constructed by an electron beam scanning the tube phosphor from top left to bottom right in a series of horizontal lines Buy Membership for Radiology Category to continue reading. Learn more here