Refresh type output devices in Computer Graphics Last Updated : 21 Aug, 2019 Summarize Comments Improve Suggest changes Share Like Article Like Report CRT stands for cathode ray tube. CRT it is an elevated glass tube. An electron gun at one side of the tube produces a beam of electrons which is directed towards the front of the tube or towards the screen. The inner side of the screen is coated with Phosphorus substance which gives off the light when it stopped by electrons. Standard CRT: In standard CRT the electron gun emits electron beams which fall on the phosphor coating due to which a glow occurs which display the text or a picture. afterglow the light gets filled for continuous viewing the image is therefore refreshed at regular intervals so frequently that the changing image appears as a continuous picture to the human eyes. Beam penetration CRT: A normal CRT with phosphor coating generate images of only one colour a colour CRT for line drawing displays images on multilayer phosphor. Colours are achieved by controlling the beam accelerating potential. The screen is coated with a layer of green phosphor over which area of red phosphor is deposited. When a low potential electron beam strikes the screen only the red phosphorus gets excited thus producing a red trace. A higher velocity beam will penetrate into the green phosphor increasing the green components of the light output by varying the beam potential different combinations of Red and Green lights can be produced. Shadow mask CRT: The majority of colour television sets and computer monitors used Shadow mask colour CRT which has phosphor coated screen behind the screen there is a metal plate with small holes arranged in a specific pattern. It uses three electron guns for red green and blue components of the light output. The guns are arranged in a triangular fashion the deflection system operates on the three electron beam simultaneously bringing them to the same point of focus on the shadow mask all the three beans pass through a single Hole in the Shadow mask and strikes the phosphor at the described point. Figure - Colour CRT Shadow mask techniques Comment More infoAdvertise with us Next Article Graphics Software Standards in Computer Graphics A A_K_Mishra Follow Improve Article Tags : Computer Graphics Similar Reads Handling of Input Device in Computer Graphics A device through which a user can give data, information, or control signals to a computer is known as an input device. A computer Central Processing Unit (CPU) accepts and processes data to generate the output. For example, light pen, keyboard, etc. are examples of event-driven- input -devices. Han 6 min read Display Processor in Computer Graphics Display Processor is the interpreter or a hardware that converts display processor code into picture. The Display Processor converts the digital information from CPU to analog values. The main purpose of the Digital Processor is to free the CPU from most of the graphic chores. The Display Processor 1 min read Graphics Software Standards in Computer Graphics Graphics software standards help to create and set a standard for the development of computer graphics, as there are mainly two categories or general classes of computer graphics: General programming packages and Special-purpose applications packages. IntroductionEach of these classes has its softwa 4 min read Vector Graphics in Computer Graphics Vector graphics are a flexible and scalable way to create images using mathematical equations and geometric shapes, unlike pixel-based raster graphics. This method ensures that images maintain high quality and sharpness at any size, making them ideal for logos, illustrations, and other designs. In t 6 min read Introduction to Computer Graphics The term 'Computer Graphics' was coined by Verne Hudson and William Fetter from Boeing who were pioneers in the field. Computer graphics is a dynamic and essential field within computing that involves the creation, manipulation, and rendering of visual content using computers.In today's digital era, 5 min read Projections in Computer Graphics Representing an n-dimensional object into an n-1 dimension is known as projection. It is process of converting a 3D object into 2D object, we represent a 3D object on a 2D plane {(x,y,z)->(x,y)}. It is also defined as mapping or transforming of the object in projection plane or view plane. When g 5 min read Like