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Welcome to the year 00 where for example you will find a computer in 7 out 10 family households. With the computer you find, you will basically see a keyboard, the speakers, the system unit, the printer, and the most useful output device, the monitor, your best friend. The reason why the monitor is considered the most useful output device is because it provides the user with all the images, graphics, or text he or she uses. Without the monitor, the user will not know what her or she is doing.
Today, the most commonly used computer monitor is the Cathode Ray Tube (CRT) monitor. The first controllable CRT monitor was developed by a German scientist named Karl Ferdinand Braun in 187. However, it was not until the early 140's that the CRT monitor was used on television sets and throughout the years, improvements have been made to be used on compu- ters.
The CRT monitors come in various sizes ranging from 15 inches to inches. The bigger these monitors are, the more information you are able to see on the screen, and the more expensive they are to the users. The screen on the CRT monitor are either slightly curved or flat panels depending on the user. Of course, there is a price difference between the two.
A CRT monitor is a large sealed glass tube with no air inside. It begins with a slim neck and increases in size outward until it forms a large base called the screen. The screen is coated with thousands of tiny phosphor dots. Each of these dots consist of three blobs of colored phosphor, one red, one green, and one blue. These three dots combine to make up a pixel which is a single point in an electronic image. Inside the back of the CRT monitor, the electron gun is located. The electron gun is composed of the cathode, heat source, and focusing elements. Each color has its own electron gun. The images are formed when electrons fired from the electron gun come together to a single spot on the surface of the CRT.The electrons must be precise when they are fired from the electron gun because these three colors make up all of the thousand of colors on the images seen. When each of the primary colors are added in equal amounts, they form a white spot, while the absence of any color creates a black spot. When the colors are not precise, a shadow appears. These shadows are the ones used in text and graphic images. In order for the electrons to reach the phosphor, they pass through the monitors focusing elements. The focusing elements are set up to focus the electron flow into a very thin beam and then into a specific direction. This is how the electron beam lights up the specific phosphor dot. The electrons are drawn to the phosphor dots by a positive charged anode that is located near the screen.
Around the neck of the CRT, the deflection yoke is located. This creates a magnetic field that controls the direction of the electron beams. This guides the electron beams to strike the proper position on the screen. Striking the position on the screen starts at the top left corner and flashes on and off as it moves across the row to the right corner. When it reaches the edge of the screen, it moves down to the next line and this time moves from right to left. As the electron beams move from right to left, they need to coincide with the electron beams from the row before so that the retraceable lines are invisible. The beam repeats this process until all the lines on the screen are traced moving down to the bottom and then to the top of the screen where it is ready to display the next image.
The most important aspect of a monitor is the resolution. The resolution describes the sharpness and clearness of the images and it is stated as pixels. The greater the number of pixels on the monitor, the better the quality of the image will be. The standard SVGA resolution is 800 by 600 pixels, where 800 is the number of pixels horizontally and 600 being the number of pixels vertically which create a screen image with a total of 480,000 pixels. Most monitors can display up to 180 by 104 pixels depending on how the user wants to use it. Displays with higher resolution use a greater number of pixels, but as the resolution increases, the images on the screen appear smaller. This is why large monitors typically use higher resolution and smaller monitors use lower resolution.
Dot pitch is a another important factor in a monitor that is used to measure the clarity of an image. Dot pitch is the distance between each pixel on an image. The smaller the distance is between the pixels, the sharper the image will be and the less eye fatigue the user will get. Today, the standard dot pitch is . millimeters and ranges to . millimeters.
Another factor in a monitor's quality is the refresh rate. Refresh rate is the speed at which a monitor redraws the images on the screen. A cathode ray tube monitor refresh rate has to be fast to maintain a constant flicker free image. If the CRT monitor has a slow refresh rate, then the image fades and flickers as it is redrawn thus causing eye fatigue and headaches to some users. The monitors refresh rate is measured in hertz which is the number of times per second the screen is redrawn. Most monitors provide a refresh rate of at least 75 hertz, meaning that the image on the screen redraws itself 75 times in a second.
All of these factors make up the quality of a monitor which create a clear image on the screen and not causes eye fatigue or headaches to the user. With all of these elements described, one sees why the monitor is the most useful output device in the computer.Please note that this sample paper on monitor, yoiur best friend is for your review only. In order to eliminate any of the plagiarism issues, it is highly recommended that you do not use it for you own writing purposes. In case you experience difficulties with writing a well structured and accurately composed paper on monitor, yoiur best friend, we are here to assist you.Your college papers on monitor, yoiur best friend will be written from scratch, so you do not have to worry about its originality.
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