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Glossary of Technical Terms

LCD TV & LCD Monitor Glossary

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Tuesday, 09 June 2009 22:50

A ~ H


Analog to Digital Conversion

LCD monitors with an analog interface can accept an analog video signal using standard RGB connectors for personal computers, in the same way as a CRT monitor. The analog signal is then converted into the digital signal used for display on a LCD panel. LCD monitors with only a digital interface require a dedicated graphics adapter and connectors, which come in varied formats.

A/D Converter

(Analog/Digital converter) A device that converts continuously varying analog signals from instruments that monitor such conditions as movement, temperature, sound, etc., into binary code for the computer. It may be contained on a single chip or can be one circuit within a chip.


(American National Standard for Human Factors Engineering of Visual Display Terminal Workstations). Organization that produces publications concerning the ergonomics of monitors.

Anti-glare Filter

A treated glass panel that is placed over a monitor screen to reduce glare.

Anti-glare Screen

A monitor screen that is treated to reduce glare from light sources. Non-glare CRTs often use a coating baked onto the screen at the time of manufacture, which provides a significant reduction in glare; however, LCD screens may completely eliminate it.

Aspect Ratio

Refers to the width to height proportion of a display’s content area. Traditional TVs sport an aspect ratio 4:3 and 5:4, while widescreen monitors come in 16:9 or 16:10 aspect ratios.

Asset Control

Saves the time of manually tracking monitors across the network. Allows the retrieval of key asset-tracking information, such as monitor make, model, and serial number, when the monitor is used with a Compaq PC supporting Intelligent Manageability and appropriate network software. This information is especially useful for network administrators.

Auto Adjust

A special one-touch Auto Adjust button allows users to quickly set the display panel to match their preferences and provides users with excellent front-of-screen performance and minimal set up.

Auto Sync

Same as Auto Adjust.


An LCD screen that has its own light source from the back of the screen, making the background brighter and characters appear sharper.


The speed, measured in megahertz, at which the data can be accepted from the CPU/graphics adapter to the monitor. A greater speed means that higher resolutions can be shown with more brightness and clarity.


Brightness is the emitted luminous power of a TV screen.

Candelas / square meter (cd/m2)

An international unit used to measure the luminous intensity of LCD TVs. Corresponds to nit units.

Color Temperature

Defines the whiteness of the white on the screen. Variations are measured in degrees Kelvin. Natural colors used in life-like images, such as people or landscapes, look more true to life when displayed at a color temperature of 6500K. Black text on a white page is better represented by a color temperature of 9300K.

Color Matching

Color matching refers to the process of accurate duplication of colors between the display and either input (like a VGA card) or output (like a printer). An LCD display with color matching stores color-related parameters in special memory called EEPROM, and uses this data for optimization, providing benefits such as WYSIWYG printing and faithful representation of Web graphics.


Contrast is the ratio between the light intensity of the brightest and the darkest point of an image. High contrast performance results in greater color performance and increased detail levels in dark areas of an image.

DDC (Used by Plug and Play monitors)

Short for Display Data Channel, a VESA standard for communication between a monitor and a video adapter. Using DDC, a monitor can inform the video card about its properties, such as maximum resolution and color depth. The video card can then use this information to ensure that the user is presented with valid options for configuring the display.


Display Data Channel 1. A uni-directional data channel from the display to the host, continuously transmitting Extended Display Indentification, EDID information.


Display Data Channel 2. A bi-directional data channel based on the 12C protocol. The host can request EDID or VDIF information over the DDC2 channel. In addition to this, the DDc2 channel can act as a transparent channel for ACCESS.bus communication.

Digital Tuner

A DTV tuner, which can take the form of a set-top box, is used to decode digital broadcast signals for LCD TVs that are not integrated with their own digital tuners. LCD TVs featuring their own integrated DTV tuners (also called ATSC tuner, digital tuner, etc), do not require the help of an additional DTV tuner.

Display colors

The number of colors that an LCD TV can display is typically 16.2 million or 16.7 million.

Display Modes

Specific frequencies at which the monitor (and/or computer) can display text or graphical information. Most monitors today support several frequencies. This is called multifrequency or multi-scanning, and it ensures that the monitor will perform with a variety of computers and applications.

Dot Pitch

A measurement of distance between the centers of two same-color phosphor dots on the screen. The closer the dots, the smaller the dot pitch, and the sharper the image.


DTV stands for Digital Television, the latest standard and the future of television broadcasting. Unlike analog TV, which is broadcast using magnetic waves, DTV is broadcast digitally to transmit an audio and video signal for movie-like picture quality and surround sound.


Acronym for Digital Visual Interface, DVI is one of the standard digital interfaces used by LCD TVs and other display devices.

Dynamic contrast ratio

Dynamic contrast ratio (DCR), usually greater in number than contrast ratio, indicates a wider spectrum of brightness that a LCD screen can reach via sacrificing highlight details in dark images.

Energy Star

A program established by the Environmental Protection Agency (EPA) as a partnership with the computer industry to promote the introduction of energy-efficient personal computers which help reduce air pollution caused by power generation. This program was formally launched on June 17, 1993. To comply with the Energy Star guidelines, a computer system or monitor must consume less than 30 watts of power in its lowest power state.

ErgoDesign® Features

Enhance human ergonomics to improve the working environment, protect the health of the user, and save money. Examples include OSM controls for quick and easy image adjustments, tilt/swivel base for preferred angle of vision, and compliance with MPRII guidelines for lower emissions.


(Federal Communications Commission)


VESA Standard Physical Mounting Interface Standard

Ghosting or Smearing

A faint duplicate image left behind for a split second when displaying dynamic or fast moving images. Fast response times help LCD monitors combat ghosting and smearing.


A High Definition Television must be able to display at least 720 active vertical scanning lines in progressive mode (720p) or 1080 active vertical scanning lines in interlaced mode (1080i), or higher in a 16:9 widescreen format.

Horizontal Frequency

The number of lines illuminated on a video screen in one second. For example, a resolution of 400 lines refreshed 60 times per second requires a scan rate of 24KHz plus overhead (time to bring the beam back to the beginning of the next line). See also Scan Rate.


HDMI (High Definition Multimedia Interface) is a relatively new digital connector to carry both high definition digital video and maximum 8 channels of uncompressed digital audio signals. HDMI will eventually replace DVI, and will be the standard connector on high definition devices, such as HD DVD players, Blu-ray players, digital set-top boxes, and the Sony PlayStation 3 game console.


High Definition Television; must be able to display 720 active vertical scanning lines in progressive mode (720p) or 1080 active vertical scanning lines in interlaced mode (1080i), or higher in a 16:9 widescreen format.


Hertz. In video displays, it is used to indicate the rate at which an image is refreshed. A higher value means the display is refreshed faster.


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