Although flat-panel monitors have been used primarily on portable computers, a new generation
of large, high-resolution, flat-panel displays is gaining popularity among users of desktop
systems. These new monitors provide the same viewable area as CRT monitors, but they take up
less desk space and run cooler than traditional CRT monitors.
There are several types of flat-panel monitors, but the most common is the liquid crystal
display (LCD) monitor. The LCD monitor creates images with a special kind of liquid crystal
that is normally transparent but becomes opaque when charged with electricity.
There are two main categories of liquid crystal displays:
1) The passive matrix LCD relies on transistors for each row and each column of pixels, thus
creating a grid that defines the location of each pixel. The color displayed by a pixel
is determined by the electricity coming from the transistors at the end of the row and the
top of the column. Althuogh passive matrix monitors are inexpensive to manufacture, they
have a narrow viewing angle. Another disadvantage is that they don't "refresh" the pixels
very quickly. If you move the poniter too quickly, it seems to disapear, an effect known
as submarining. Animated graphics can appear blurry on a passive matrix monitor.
2) The active matrix LCD technology assigns a transistor to each pixel, and each pixel is
turned on and off individually. This enhancement allows the pixels to be refreshed much
more rapidly, so submarining is not a problem. Active matrix displays use thin-film -
-transistor (TFT) technology.
of large, high-resolution, flat-panel displays is gaining popularity among users of desktop
systems. These new monitors provide the same viewable area as CRT monitors, but they take up
less desk space and run cooler than traditional CRT monitors.
display (LCD) monitor. The LCD monitor creates images with a special kind of liquid crystal
that is normally transparent but becomes opaque when charged with electricity.
1) The passive matrix LCD relies on transistors for each row and each column of pixels, thus
creating a grid that defines the location of each pixel. The color displayed by a pixel
is determined by the electricity coming from the transistors at the end of the row and the
top of the column. Althuogh passive matrix monitors are inexpensive to manufacture, they
have a narrow viewing angle. Another disadvantage is that they don't "refresh" the pixels
very quickly. If you move the poniter too quickly, it seems to disapear, an effect known
as submarining. Animated graphics can appear blurry on a passive matrix monitor.
2) The active matrix LCD technology assigns a transistor to each pixel, and each pixel is
turned on and off individually. This enhancement allows the pixels to be refreshed much
more rapidly, so submarining is not a problem. Active matrix displays use thin-film -
-transistor (TFT) technology.
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