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Monitor
Introduction to Monitors
When we use a computer we need some device to see the results of the work we are doing. A computer monitor is used for this purpose. Monitors work very much like a T.V, main difference between TV and monitor is a monitor does not contain any tuner circuit and resolution (number of columns and lines it can display) of monitor is much higher compared to a TV. Like a TV the main component inside a monitor is a picture tube or a Cathode Ray Tube (CRT). It is an evacuated glass tube, roughly conical in shape with a phosphor coating on the inside of the large screen end and an electron gun at the narrow end. The gun fires a narrow beam of electrons at the screen and when this beam strikes the phosphor coating light is emitted.
Two techniques are followed for generating image on CRT display they are Raster Scan and ?Vector Scan
Interlacing in Monitors Information on a monitor is displayed by an electron gun scanning phosphor inside of the display. The gun scans from the top to bottom, left to right with each complete scan displaying a frame. The gun works like a thin beam of spray paint coating of the inside of your monitor. In order to avoid a flickering image some display adapters force the monitor to create an interlaced image. Instead of the electron gun scanning from the top to bottom in a continuous manner on the first pass it will skip every next line. On the second pass it will scan the lines it missed during the first time, thus creating the full image in two scans instead of one.
Non Interlaced DIsplay It is the opposite of interlaced display all the lines are scaned or displayed in one pass instead of the two passes required in the interlaced display.
Frame Rate
This is used to show the number of times a screenful of information is produced per second or the number of times a frame is shown on the monitor. Higher the frame rate lesser the flicker problem.
Video Bandwidth
It is the highest input frequency a monitor can handle and helps in determining the resolution capabilitites of the monitor. It is measured in Megahertz. If the bandwidth of the input signal exceeds the given range of a monitor it may cause compatibility problems and one may not get the proper image on the screen. The higher the value the better is the image.
Bandwidth of a Monitor= Horizontal Pixel x Vertical Pixel x Frame Rate
Screen size
Most computer displays ae rated by their screen size. As with televisin sets, measurement of the cathode ray tube (CRT or picture tube) in a computer monitor is made diagonally across its face. The active display of a 12 " monitor may measure somewhat less than 9x7 inches.
Image Size
Two monitors with the same size of screen may have entirely different on screen image sizes.
Aspect Ratio
The width to height ratio of an image or computer screen is known as the aspect ratio. Aspect ration becomes important in preventing distortion when an image is resized or incorporated into another software. Standard television has an aspect ratio of 4:3 (W:H)
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Monitor
Introduction to Monitors
When we use a computer we need some device to see the results of the work we are doing. A computer monitor is used for this purpose. Monitors work very much like a T.V, main difference between TV and monitor is a monitor does not contain any tuner circuit and resolution (number of columns and lines it can display) of monitor is much higher compared to a TV. Like a TV the main component inside a monitor is a picture tube or a Cathode Ray Tube (CRT). It is an evacuated glass tube, roughly conical in shape with a phosphor coating on the inside of the large screen end and an electron gun at the narrow end. The gun fires a narrow beam of electrons at the screen and when this beam strikes the phosphor coating light is emitted.
Two techniques are followed for generating image on CRT display they are Raster Scan and ?Vector Scan
Interlacing in Monitors Information on a monitor is displayed by an electron gun scanning phosphor inside of the display. The gun scans from the top to bottom, left to right with each complete scan displaying a frame. The gun works like a thin beam of spray paint coating of the inside of your monitor. In order to avoid a flickering image some display adapters force the monitor to create an interlaced image. Instead of the electron gun scanning from the top to bottom in a continuous manner on the first pass it will skip every next line. On the second pass it will scan the lines it missed during the first time, thus creating the full image in two scans instead of one.
Non Interlaced DIsplay It is the opposite of interlaced display all the lines are scaned or displayed in one pass instead of the two passes required in the interlaced display.
Frame Rate
This is used to show the number of times a screenful of information is produced per second or the number of times a frame is shown on the monitor. Higher the frame rate lesser the flicker problem.
Video Bandwidth
It is the highest input frequency a monitor can handle and helps in determining the resolution capabilitites of the monitor. It is measured in Megahertz. If the bandwidth of the input signal exceeds the given range of a monitor it may cause compatibility problems and one may not get the proper image on the screen. The higher the value the better is the image.
Bandwidth of a Monitor= Horizontal Pixel x Vertical Pixel x Frame Rate
Screen size
Most computer displays ae rated by their screen size. As with televisin sets, measurement of the cathode ray tube (CRT or picture tube) in a computer monitor is made diagonally across its face. The active display of a 12 " monitor may measure somewhat less than 9x7 inches.
Image Size
Two monitors with the same size of screen may have entirely different on screen image sizes.
Aspect Ratio
The width to height ratio of an image or computer screen is known as the aspect ratio. Aspect ration becomes important in preventing distortion when an image is resized or incorporated into another software. Standard television has an aspect ratio of 4:3 (W:H)
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