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What are the benefits of LCD Monitor?
What is the difference between Refurbished and As-Is Monitor?
What is a Pixel?
What is dot pitch (DPI)?
What is the difference between shadow-mask and aperture-grille monitors?
What is degaussing?
How is the resolution set in Windows 98?
How to install multiple monitors in one computer?
Why do I see two horizontal lines displayed across my brand new monitor?
Why is my monitor flickering?
Why are my screen colors and portions of my display suddenly distorted?
Why does my monitor make a snapping noise followed by a clicking noise during startup?
Why are display images shrinking and expanding as the displayed images change?
Why is the color on portions of the display not changing as the displayed images change?
Why is the entire display suddenly displaying incorrect colors?
         
      


How does an interlaced monitor differ from a non-interlaced monitor?

Older monitors sometimes employed a scanning technique where odd lines were first refreshed followed by the even lines. While this was an inexpensive way of increasing screen resolution it caused flicker. For this reason, most monitors are now non-interlaced. Non-interlaced monitors refresh each line of the display in turn from top to bottom.
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Why is the viewable area less than the stated monitor size?

Typical computer monitors range in size from 14 to 21 inches. Most monitors sold with Microsoft Windows come with either a 15 or 17-inch monitor. The size of the monitor is determined by measuring the diagonal distance across the surface of the cathode ray tube (CRT). Since the CRT is encased in a plastic housing, also called a bezel, the viewable area of a monitor is always less than the stated monitor size. The viewable area is then the diagonal measurement of the portion of the CRT that is visible.
Viewable area is often referred to as "vis" for viewable image size and sometimes "dvi" for diagonal viewable area.  Typically, the viewable area of a monitor will be about one inch smaller than  the stated CRT size.

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What is a Pixel?

Pixels or picture elements are the number of dots on the screen and are composed of one red, green and blue glowing phosphor dot.  The more dots, the sharper the image.

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What is dot pitch (DPI)?

Dot pitch refers to the distance between two same-colored red, green or blue phosphor screen dots. Typical dot pitches range in distance from .25 to .39 millimeters. A smaller DPI indicates that more pixels are present in a measure of screen space and this yields a sharper screen image.
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What is the difference between shadow-mask and aperture-grille monitors?

Shadow-mask monitors are sometimes called dot trio monitors because their design uses phosphor dots arranged in red, green and blue triangles.  The shadow-mask name derives from the phosphor dots being separated by a metal mask.  Aperture-grille monitors, such as Sony Trinitron and Mitsubishi Diamondtron, use a phosphor coating of alternating red, green and blue vertical stripes instead of triangle dots.  Aperture-grille is a more complicated technology and requires 1, 2 or 3 wires be horizontally imbedded in the monitor to act as image stabilizing reference points.  Proponents of aperture-grille monitors prefer their brighter colors while detractors point out that the horizontal stabilizing wires are noticeable.  In general, shadow-mask monitors are more price-competitive, provide good focus and use a nearly flat surface which reduces distortion.  Aperture-grille monitors are less heat sensitive which allows for higher color purity, brighter due to increased phosphor surface and use darker glass which enables increased contrast.
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What is degaussing?

Degaussing is a process by which monitors reverse internal magnetization by introducing a magnetic field that is stronger than the offending internal magnetization.  Most modern monitors are manufactured with a degaussing coil and degauss at startup.  Most modern monitors also have a manual degaussing control.  If your monitor develops a color problem on part of the screen, it may be caused by either internal or external magnetic interference.  To correct the problem, degauss the monitor and remove the offending external magnetic generator. 
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How is the resolution set in Windows 98?

Resolution or desktop area as it is referred to in Windows is the measure of dots on the screen. Higher resolutions result in more viewable information, but the information will be smaller and more difficult to view. Windows resolutions are stated in horizontal by vertical dimensions and maintain an aspect ratio of 4 by 3. Typical Window resolutions are: 640 by 480, 800 by 600, 1024 by 768, 1152 by 864 and 1280 by 1024. In Windows, resolution is set by double-clicking Control Panel, Display and then the Settings tab.. 
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How is the refresh rate set in Windows 98?

Slow refresh rates will cause a monitor to flicker. A refresh rate of 70Hz is said to be flicker-free. The refresh rate is typically set by a utility program furnished by the video card manufacturer.. 
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The number of colors that can be displayed on a monitor is actually limited by video memory rather than the monitor.  The terms 256 colors, high colors and true colors are used to indicate the number of bits used to store color information.  The more bits, the more colors and the more video memory required.  256 colors uses 8-bits and hence only 256 different colors are available for display if you select 256 colors.   High color uses 16-bits and hence 65,536 (64k) colors are available for display by selecting high color.  True colors uses 24-bits and hence 16 million colors are available for display by selecting true colors. Note, it is difficult for the human eye to distinguish a difference between 16 and 24-bit color.  The difference between 8 and 16-bit color is extremely noticeable. 
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Why do I see two horizontal lines displayed across my brand new monitor?

Aperture-grille monitors such as Sony Trinitron, Mitsubishi Diamondtron and ViewSonic SonicTron use a technology called aperture-grille that uses alternating red, green and blue vertical phosphor stripes instead of dot triangles to yield sharper images and brighter colors.  Aperture-grille technology uses 1, 2 or 3 (depending on monitor size) horizontal stabilizing wires which can be seen as fine lines across the screen on bright images.  The visible horizontal stabilizing wires are a normal characteristic of all aperture-grille monitors. 
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Why is my monitor flickering?

Flickering results when the "excited" phosphor begins to decay before being refreshed.  Typically, a vertical refresh rate above 70 Hz will eliminate flicker.   Remember, the vertical refresh rate, measured in Hertz, represents the number of times per second the monitor/video card refreshes the entire screen.  Since our peripheral vision is more sensitive to flicker, scan the edges of the display with your peripheral vision to check for flicker. The Video Electronics Standards Association (VESA) has set 85 Hz as the standard for flicker-free viewing, but it's generally best to set the refresh rate at the lowest point at which flicker is not noticeable.  Excessive refresh rates degrade image quality and can actually harm a monitor if the refresh rate is outside of the monitor's supported range. 
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Why are my screen colors and portions of my display suddenly distorted?

External electromagnetic influences can easily cause display distortion.  If your monitor suddenly displays distorted images or incorrect colors on portions of the display, check for any magnetized objects around the monitor.  Monitors located next to each other, surge protectors, overhead lights and speakers can negatively effect a monitor's display.  
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Why does my monitor make a snapping noise followed by a clicking noise during startup?

Monitors typically degauss at startup often resulting in a snapping noise which can be followed by a clicking noise that results from the monitor switching into video mode after degaussing. 
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Why are display images shrinking and expanding as the displayed images change?

A failing monitor power supply will often cause images to shrink or expand as the displayed image changes. 
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Why is the color on portions of the display not changing as the displayed images change?

Unchanging colors on a portion of the display typically indicate a problem with the random access memory of the video card.  Try using the monitor on another computer to ascertain if the problem resides with the video card or the monitor. 
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Why is the entire display suddenly displaying incorrect colors?

Monitors use a DAC (digital to analog) circuit to convert the digital information maintained in the random access memory of the video card into the analog signals used to control the monitor's electron gun.  If the entire screen suddenly starts displaying colors incorrectly, it can indicate a failure of the DAC circuit in the monitor.  Try using the monitor on another computer to ascertain if the problem resides with the video card or the monitor. 
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