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LCD pixels are very different from the pixels in a CRT A CRT pixel s size will change depending on the resolution The pixels in an LCD panel are fixed and cannot be changed See the LCD Resolution section later in the chapter for the scoop
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Figure 1513
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15: Understanding Video
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No charge, enabling light to pass
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Figure 1516
from the others To create an image, each area was charged at the same time Figure 1517 shows the number zero, a display made possible by charging six areas to make an ellipse of sorts This process, called static charging, is still quite popular in more basic numeric displays such as calculators The static method would not work in PCs due to its inherent inflexibility Instead, LCD screens use a matrix of wires (see Figure 1518) The vertical wires, the Y wires, run to every sub-pixel in the column The horizontal wires, the X wires, run along an entire row of sub-pixels Electrical charge, enabling no light to pass There must be a charge on both the X and Y wires to make enough voltage to light a single sub-pixel If you want color, you have three matrices The three matrices intersect very close together Above the intersections, the glass is covered with tiny red, green, and blue dots Varying the amount of voltage on the wires makes different levels of red, green, and blue, creating colors (see Figure 1519) We call this usage of LCD technology passive matrix All LCD displays on PCs used only passive matrix for many years Unfortunately, passive matrix is slow and tends to create a little overlap between individual pixels This gives a slightly blurred effect to the image displayed Manufacturers eventually came up with a speedier method of display, called dual-scan passive matrix , in which the screen refreshed two lines at a time Although other
LCD pixels
Mike Meyers CompTIA A+ Guide: Essentials (Exam 220-601)
Figure 1517
Single character for static LCD numeric display
LCD technologies have since appeared, dual-scan continues to show up on some lower-end LCD panels
Thin Film Transistor
A vast improvement over dual scan is called active matrix or thin film transistor (TFT) Instead of using X and Y wires, one or more tiny transistors control each color dot, providing faster picture display, crisp definition, and much tighter color control TFT is the LCD of choice today, even though it is much more expensive than passive matrix (see Figure 1520)
LCD Components
The typical LCD projector is composed of three main components: the LCD panel, the backlight(s), and the inverters The LCD panel creates the image, the backlights illuminate the image so you can see it,
Figure 1518
An LCD matrix of wires
Figure 1519
Passive matrix display
Figure 1520
Active matrix display
15: Understanding Video
Figure 1521
LCD internals
and the inverters send power to the backlights Figure 1521 shows a typical layout for the internal components of an LCD monitor One of the great challenges to LCD power stems from the fact that the backlights need AC power while the electronics need DC power The figure shows one of the many ways that LCD monitor makers handle this issue The AC power from your wall socket goes into an AC/DC transformer that changes the power to DC The LCD panel uses this DC power Note in Figure 1521 that this monitor has two backlights: one at the top and one at the bottom Most LCDs have two backlights, although many only have one All LCD backlights use cold cathode fluorescent lamp (CCFL) technology, popular for its low power use, even brightness, and long life Figure 1522 shows a CCFL from an LCD panel CCFLs need AC power to operate, but given that the transformer converts the incoming AC power to DC, each CCFL backlight needs a device called an inverter to convert the DC power back into AC Figure 1523 shows a typical inverter used in an LCD Looking once again at Figure 1521, note the DVI and VGA inputs DVI is a digital signal, so it connects directly to the LCD s logic circuitry The VGA goes to an analog to digital converter before reaching the LCD logic board Keep in mind that Figure 1521 is a generic illustration The actual location and interconnections of the different components are as variable as the number of LCD panels available today!
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