Vga short for Video Graphics Array, VGA

Terms 1

VGA

• VGA - Short for Video Graphics Array, VGA is a popular display standard developed by IBM and introduced in 1987 VGA provides 640 x 480 resolution color display screens with a refresh rate of 60Hz and 16 colors displayed at a time. If the resolution is lowered to 320 x 200, 256 colors can be displayed VGA capability is built into plug -in video cards, VGA chips, and monitors that can work with the VGA cards. Today VGA has been replaced by SVGA.

SVGA

• Super Video Graphics Array or Super Vector Graphics Adapter (PC monitor display standard that allows resolution above 640 by 480 pixels and up to 16.2 million colors).

• This is the type of connector you will find for most typical PC monitors and some LCD screens

VGA / SVGA

DVI

• Short for Digital Visual Interface, DVI is a digital connection used to connect devices such as projectors, TVs, etc.

• This is the type of connector you will find on modern Mac monitors, high-end LCDs, and HDTVs

CRT

• Cathode Ray Tube

• A vacuum tube in which a hot cathode emits a beam of electrons that pass through a high voltage anode and are focused or deflected before hitting a phosphorescent screen.

• A vacuum tube in which a hot negatively charged electrode (the source of electrons) emits a beam of electrons that pass through a high voltage positively charged electrode (by which electrons leave) and are focused or deflected before hitting a lighted screen.

LCD

• Liquid Crystal Display

• A digital display that uses liquid crystal cells that change reflectivity in an applied electric field; used for portable computer displays and watches phosphorescent etc.

• A digital display screen that uses liquid crystal to define the color contrast for better visibility.

LED

• LEDs are special diodes that emit light when connected in a circuit. They are frequently used as "pilot" lights in electronic appliances to indicate whether the circuit is closed or not.

• Traditional bulbs control current with heated filaments. LEDs are a solid-state device and do not use filaments. This makes LEDs very reliable with a long lifespan (typically 100,000 hours). LEDs have low power consumption and low heat output making them an ideal replacement for traditional bulbs. LEDs can be dimmed.

OLED

• Organic light emitting diode (OLED) technology uses substances that emit red, green, blue or white light. Without any other source of illumination, OLED materials present bright, clear video and images that are easy to see at almost any angle.

• Prior to standardization, OLED technology was also referred to as OEL or Organic Electro-Luminescence. One of the great benefits of an OLED display over the traditional LCD displays found in computer displays is that OLED displays don't require a backlight to function. This means that they draw far less power and they can be used with small portable devices which have mostly been using monochrome low-resolution displays to conserve power. This will also mean that they will be able to last for long periods of time with the same amount of battery charge.

Jaggies

• The stair-stepped or star like appearance of diagonal lines where there should be smooth lines.  This is caused in output devices, such as the monitor and printer, when there are not enough pixels in the image or on screen to represent them realistically, or not enough resolution. Jaggies often occur when a bit-mapped image is converted to a different resolution.

• Also called "stair-stepping" and "aliasing".

Anti-aliasing

• A software program that rids a computer of jaggies by smoothing the jagged appearance of diagonal lines in a bitmapped image. The pixels that surround the edges of the line are changed to varying shades of gray or color in order to blend the sharp edge into the background.

• This technique is also called "dithering," but is usually known as anti-aliasing when applied to diagonal and curved lines.