• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Monitor (Display screen).

Extracts from this document...


Monitor (Display screen) A monitor can be considered as a window into the computer's memory. It allows data entry to be checked by echoing input characters on the screen. The disadvantage of monitors is that data on the screen is temporary (called softcopy) and they can hold only limited amount of data. Quality Factor - Resolution Resolution defines sharpness and clarity of an image and is specified as the number of dots per character. Modern packages are using a lot of graphics and therefore require high-resolution monitors. Display Adaptors Adaptors are cards installed in motherboard to control a monitor. The following specifications were evolving over the years: * Hercules - mono * Colour Graphics Adaptor (CGA) - low quality * Enhanced Graphics Adaptor (EGA) - medium quality * Video Graphics Array (VGA and Super VGA) - high quality * Extended Graphics Array (XGA) - successor of SVGA, has the power to handle the video and animation requirements of the modern multimedia packages and games Bit Mapping Technique For monochrome displays, only one bit of memory is required for each pixel. ...read more.


Today monitors are available in sizes 14", 15", 17", 21". But the monitor size doesn't tell anything about the maximum viewable image size. The bezel in front of every monitor's CRT diminishes the viewable area by approximately an inch. When deciding on which monitor to buy, think of which resolution you'll be working in most frequently. The higher the resolution, the bigger the monitor is required. Monitors usually display 25 lines 80 characters each in text mode. Standard Resolutions (in pixels) VGA 640 x 480 SVGA 800 x 600 XGA 1024 x 768 1280 x 1024 1600 x 1200 Some high-end monitors support these high resolutions. Designed for professional level work, 1600 x 1280 e.g. computer-aided design or desktop publishing 1800 x 1440 Supported by at least one: ViewSonic P815 Mega An interlaced monitor draws its screen in two passes. First it draws every second line and then fills in the missing lines. Interlacing is noticeable because of flicking screen and can cause headaches. A non-interlaced monitor draws its screen in one pass. Another reason for a flicking screen is the frequency with which the monitor redraws its screen - called refresh rate or vertical scan rate. ...read more.


For multimedia applications with video images the fast response time of TFT active matrix displays is ideal. For color active matrix provides individual color bits for each displays. An active-matrix display uses from one to four transistors to control each pixel. LCDs do not exaggerate actual viewing areas like regular monitors. For example, a 9.4" LCD provides 9.4" diagonal viewing area. This is the equivalent of an 11" CRT. Color LCD Comparison Chart Technology Contrast Ratio Response Viewing Angle Price Passive Matrix 20:1 300 ms Medium Medium Active Matrix 60:1 80 ms High High 3). Gas Plasma Gas-plasma display is a type of flat display screen, called a flat-panel display, used in some portable computers. Images on gas-plasma displays generally appear as orange objects on a black background. Although gas-plasma displays produce very sharp monochrome images, they require much more power than the more common LCD displays. Technology: A grid of conductors are sealed between two flat plates of glass; neon and/or argon gas fills the space between the plates. Comparison Of LCDs and Gas-Plasma Displays: Type Readability Battery Life Cost LCD Lowest Longest Lowest Gas plasma High Shortest High ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Computer Science section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Computer Science essays

  1. Data Representation

    Today most computers use 8 bits to represent a character, as this is not sufficient to represent additional characters, like accent marks. ASCII (American Standard Code for Information Interchange) ASCII is the worldwide standard for the code numbers used by computers to represent all the upper and lower-case Latin letters, numbers, punctuation, etc.

  2. Programming Techniques

    The second problem, however, is much more complicated, the errors have to be found before they can be corrected. Finding where the error is, identifying it, can be very difficult and there are a number of techniques available for solving such problems.

  1. ICT Sample Work India Red

    is ordered of a particular dish than multiply the number of serving with the price of the dish. Calculate & display added VAT. Look up the total cost of the order and add the V.A.T on. The VAT will obviously be added as a percentage.

  2. Smart Card System

    * Exportable (in binary form only). * Single distribution of the JCE 1.2.1 software from Sun Microsystems for both domestic and global users, with jurisdiction policy files that specify that there are no restrictions on cryptographic strengths. 2.6 Conclusions DES is available in software as content-encryption algorithm.

  1. data representation

    Many benchmark tasks are designed to test the speed of the machine in use, based on the running of a number of commonly used applications. This can highlight, for instance, if the machine is particularly good at database tasks, or particularly slow at running graphics tasks, etc.

  2. Computer Aided Design Package

    This will be paid in instalments at the end of each month of �5,000. This contract will also be renewed with the client providing that Engineering ? Us can adequately provide the items they required within the allotted time frame.

  1. Graphics Cards or Display Adapters

    DVD-ROM (digital versatile disc, read-only memory) is similar to a CD-OM but is capable of holding much more. Backup storage devices There are many backup solutions available, some solutions are aimed at the home user, some at the professional use. Floppy disk dives are ideal for backing up and saving small files and are highly portable and the data is easily copied.

  2. System Specification.

    The CD Rom and Floppy Drive will allow Ms Jones to save her work, and give her the option of taking her work with her. Task 3 Hardware The parts of a computer system you can see and touch e.g.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work