Keystone  
A type of distortion in which the screen image is smaller at the top or bottom, i.e. the screen has sloping sides (Rash, 1992).

Latency
See Ghosting.

LCD
Liquid Crystal Display (LCD) monitors form screen images using liquid crystals activated by electric fields. LCD monitors are flat and thin, producing smooth, crisp images with less distortion. Increasingly used for desktop displays as prices fall.

LEP  
Light emitting polymer. Recently developed light emitting material with the potential for cheaper displays.

Linearity  
The property of a display device to represent an object with dimensional accuracy, regardless of its position on the screen.  For CRT displays, non-linearity in scanning circuits can cause an image to appear to have a slightly different shape at different screen positions.  This non-linearity may change with different scanning frequencies.

Liquid Crystal Fluid
Having properties of both a solid and a liquid, it consists of rod-shaped bipolar molecules that are capable of twisting polarised light when in the OFF state.

Low Emission
A characteristic of a monitor that has been designed to lower the emission of ELF (extremely low frequency) and VLF (Very low frequency). It is usually referred to as a government safety standard. See MPR-II and TCO.

Low Radiation  
See Low Emission.

LVDS  
Low Voltage Differential Signalling. Digital display transmission protocol for short connections.

M  
Upper case M stands for Mega, Greek for 1 million, e.g. MHz.

MDR  
Miniature 'D' Ribbon: Connector for ribbon cable used in TMDS digital systems. Also known as DFP connector.

Misconvergence  
The inability of the monitor to correctly align the red, green and blue components of an image on the screen (See also Convergence).

Module
An LCD glass connected to a PCB with drivers on board. It may also have controllers, temperature compensation circuits, or other features.

Moiré
A wavy distortion pattern caused by the interference between the dot pitch of the CRT and a regular pattern picture signal. This distortion pattern may vary depending on the pattern, resolution, contrast, brightness and other characteristics of the input signal.

MPR 11
Electromagnetic radiation emission standard published by the Swedish National Board for Measurement and Testing, Sweden.

Multiple Frequency Monitor
A monitor that can be set at more than one video mode. A true multiple frequency monitor can be set at all the video modes that are currently in use today, e.g. VGA, SVGA, XGA, etc.

Multiple Scanning Monitor  
See Multiple Frequency Monitor and GTF.