Although many components in a portable computer are similar to those of a desktop system, some components are very different. The major difference between a portable system and desktop system is the display screen.
Displays
Portable computers have a flat LCD screen that is about .5 inch thick. The display is typically the most expensive component in a portable system. Often it is more economical to replace the entire computer than to replace the screen. An LCD display is designed to operate at a specific resolution because the size of the pixels on an LCD panel cannot be changed. On a desktop system, by contrast, the signal output from the video adapter can change the resolution on the monitor, thereby changing the number of pixels on the screen. An LCD panel should be thought of as a grid ruled to a specific resolution. Transistors control the color that is displayed by each pixel. The two major types of LCD displays used in portable systems today (dual-scan and active-matrix) are defined by their arrangement of transistors.
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