What is inside a Computer Monitor?

What is inside a Computer Monitor?

  Most of us spend a lot of time in front of our monitors, Let us know what is inside a computer monitor. Starting with basics. Monitor is the output device of the computer. Now- a- days they are called as I-O devices, because both input and output devices are connected together and are dependent on each other. Whatever information is accepted from the keyboard is also reflected on the monitor and the results obtained after processing are also seen on the monitor.  Monitors are also called as Cathode Ray Tube (CRT) terminals, or Visual Display Unit.  The Cathode Ray Tube (CRT) terminal or CRT monitors consists of an important component called picture tube or CRT.  This is connected to a video controller electronic circuit in the computer that supervises the operation of displaying the output or pictures on the display screen.  The CRT display device displays information as dots or picture elements (pixels) on the screen as it receives the information signals as video signals from the computer.  This device consists of an evacuated conical glass tube with phosphor coated on the inner front surface called screen. The tube consists of the following:  Electron source  Control Grid  Accelerating anode  Vertical deflection plates  Horizontal deflection plates  Interior metal coating  Screen with phosphor coating. Electron source: The electron source is a component inside the tube which consists of a heating filament and an oxide coated cathode.  This unit is a source of electrons.  The cathode is heated by a heating filament to emit a large number of electrons.  These electrons come to the control grid. Control Grid:  The control grid...
Types of Secondary storage Devices in Computers

Types of Secondary storage Devices in Computers

The size of Primary storage (or) main memory in every computer is limited. With this, the computer can only accommodate a limited sized program and data. To carry out big jobs (or) commercial data processing, it becomes essential that data be held in some expensive form of storage. This is achieved through secondary storage. It is also called as external storage, and can hold data either sequentially (or) at random. Data in storage is not directly accessible and has to be routed through the main storage for processing. Types of Secondary storage Devices in Computers are:  Magnetic tape  Magnetic disk and  Magnetic drum. Magnetic tape: • Tapes are used for recording/storing data for computer processing is plastic reel similar to long lengths of movie film. A tape is usually ½” wide and 2400 feet in length. It is coated with particles of ferric oxide on which data can be recorded magnetically. • The process of reading and writing of data is carried out on a device is called Tape Drive. Records on magnetic tape are stored in sequential order. • For example: if the payroll file is to be stored on a magnetic tape, the records would likely to be stored in the sequence of employee numbers. • Hence, magnetic tapes are referred to as sequential access device. Magnetic disk: • Magnetic disk is another type of secondary storage device known as random (direct) access as it permits direct accessing of data. • An individual disk is a circular metal plate coated on both side by ferrous oxide material. • Data is recorded in the form of magnetized spots on...
Types of Primary Memory in Computers

Types of Primary Memory in Computers

PRIMARY MEMORY As human beings have a memory system to remember even a tiny thing which went through in one’s life, similarly computer systems do contain a memory system which can store data and can be retrieved when desired. Why not after all it’s been designed and created by intellectual humans only.  Every computer system contains two kinds of memory out of which one is primary and the other is secondary memory. Basically a computer memory can store particularly two things. They are the data and the set of instructions to execute a program. Now let us take a brief look towards the primary storage (or) primary memory. This primary memory can be directly accessed by the processing unit. The contents in the primary memory are temporary. While performing a task if there is any power cut problems then we may lose the data which is in primary memory. One benefit is that we can store and retrieve the data with a considerable speed. Primary memory is more expensive when compared to secondary memory. RAM (Random Access Memory) could be the best example of primary memory. The primary memory in the computer system is in the form of Integrated Circuits. These circuits are nothing but RAM. Each of RAM’s locations can store one byte [1 Byte = 8 bits] of information. This can be in either of the forms 1 or 0. The primary storage section is made up of several small storage locations in the integrated circuits called cells. Every single cell can store fixed number of bits called word length. Each cell contains a unique number assigned to...
CGI – Computer Generated Images

CGI – Computer Generated Images

We cannot imagine the world without images and computer brought revolution in the way we look at images. In this article we will see about the Computer Generated Images. But, before that let us understand what is a image and types of images. IMAGES “A picture is worth a thousand words” margin is considered for all multimedia applications. Multimedia graphics include all types of still pictures that are photographic images and even few designers use computer generated images in their animations and multimedia applications. There are many types of images. Now let us consider few. They are: Still images Animated images Computer generated images  Still images: Still images are the images used by everyone very commonly that are pictures taken from camera. These images are copied from camera to paintings on canvases. Still images are the first images introduced to the computer world in the form of pictures and icons. Still images represent the majority of the images used today since they tend to be of small file size and require less disk space than animation (or) movies. They also don’t require special software to be installed in order to view them. Today every operating system it may be Windows (or) Linux can open still images without the need of additional software. Animated images: Animated images were introduced to the computer world shortly after the still images. They represent a series of still images shown in a succession, giving the user the idea of an animation. In the internet world, animations were introduced by animation GIF (Graphical Interface File) files. GIF was originally a file format for still images...
Introduction to E-Commerce and Types of E-Commerce

Introduction to E-Commerce and Types of E-Commerce

In this article we will discuss all the aspects of E-Commerce, a brief introduction to E-Commerce and Types of E-Commerce and various technologies of Microsoft used for E-Commerce. So lets get started. Concept of E-commerce: Commerce refers to all activities surrounding the purchase (or) sales of goods or services. A wide range of activities are involved long before an actual transaction is intended and lasts till the transaction has been executed. The various activities include:   Marketing   Sales   Payment   Fulfillment and   Customer service.  Marketing: it consists of activities associated with reaching to customers and to provide information about the company brand and products/services. Sales: it includes the activities associated with an actual sales transaction. Payment: it includes the activities associated with the buyer meeting his/her obligations under the terms of the sale. Fulfillment: these are the activities associated with the seller meeting its obligations in terms of the sales (or) the delivery of the goods and services to the buyer. Customer service: it is concerned to the follow-up activities after fulfillment of the problems and questions, pre-sales support, general enquiries etc.  INTRODUCTION TO E-COMMERCE The explosive growth of internet, commerce has captured the public’s imagination. The rapid growth of the internet and e-commerce has almost become a compulsion. Without ecommerce, the organization will be just a little slaver, just a little bit more expensive, just a little less reliable and in the end very less successful than its competitors every second in this competitive world. Ecommerce in other words, is an evolving set of information technology tools and implementation technologies together with suitable business strategies...
Types of Operating Systems

Types of Operating Systems

WHAT IS OPERATING SYSTEM An operating system acts as an interface between the computer hardware and the user. It is system software which runs on the computer, as soon as the computer is switched on. It brings the computer in to operating condition that is it makes the computer ready to be used by the programmer. This process is called Booting. The operating system monitors and controls the execution of program entered through the input device. The operating system makes the control unit to load and execute the appropriate compiler. If the user requires printing the answer (or) result on the printer, operating system software should direct that output to the appropriate printer. The combination or collection of routines to read data, load compiler, load and initiate execution of program, control the output and monitor, the completion of job is called the operating system. This operating system provides an interface between the computer hardware and the programmer [user] that simplifies and makes feasible the creation, coding, debugging and maintenance of application programs.  Easy interaction between users and computers.  It provides access to compilers to translate programs from high level language to machine language [low  level language].  It controls input, output and program execution.  It provides long term storage of user information in the form of files.  It manages the usage of main memory.  TYPES OF OPERATING SYSTEMS The types of operating systems are classified in to the following types. Consider them  Batch operating system.  Distributed operating system.  Multi-programming operating system  On-line operating system  Real-time operating system and  Time sharing operating system Consider each of them in detail…. Batch operating...