CRT
CRT stands for Cathode Ray Tube and is the most the common
type of displays. They are found in different technologies, such as Invar
and Trinitron .
LCD
LCD stands for Liquid Crystal Display and these are flat and
soft displays.
TFT
The most expensive display of this type. They are found in better grade
laptops, and are available also for use with desktop PCs. Their current
price is in excess of $1,200 for a 15.5" TFT screen. The TFT screen is
also called a "soft" screen, since the images appear softer than from Cathode
Ray Tubes..
Pixels
The screen image is made of pixels (tiny dots), which are arranged
in rows across the screen. A screen image consists of between 480,000 and
1,920,000 pixels.
Refresh Rate
The screen image is "refreshed" many times per second. Refresh rates
are measured in Hertz (Hz), which means "times per second".
Color Depth
Each pixel can display a number of different colors. The number of
colors, which can be displayed, is called color depth. Color depth is measured
in bits.
Video RAM
All video cards have some RAM. How much depends on the desired color
depth. Video cards usually have 1, 2 or 4 MB RAM for normal usage. |
