Refresh type output devices in Computer Graphics Last Updated : 21 Aug, 2019 Comments Improve Suggest changes 2 Likes 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 Create Quiz Comment A A_K_Mishra Follow 2 Improve A A_K_Mishra Follow 2 Improve Article Tags : Computer Graphics Explore BasicsBasic Graphic Programming in C++ 2 min read Vector vs Raster Graphics 7 min read Segments in Computer Graphics 8 min read Image Formats 5 min read Output PrimitivesDDA Line generation Algorithm in Computer Graphics 12 min read Bresenham’s Line Generation Algorithm 14 min read Mid-Point Line Generation Algorithm 11 min read Program to find line passing through 2 Points 6 min read Bresenham’s circle drawing algorithm 4 min read Anti-aliased Line | Xiaolin Wu's algorithm 10 min read Neighbors of a point on a circle using Bresenham's algorithm 15 min read Mid-Point Circle Drawing Algorithm 15+ min read Boundary Fill Algorithm 5 min read Flood fill Algorithm - how to implement fill() in paint? 2 min read Flood fill algorithm using C graphics 2 min read Draw a line in C++ graphics 2 min read Draw Rectangle in C graphics 2 min read Draw circle in C graphics 1 min read Draw a circle without floating point arithmetic 6 min read Code to Generate the Map of India (With Explanation) 8 min read 2-Dimensional Viewing2D Transformation in Computer Graphics | Set 1 (Scaling of Objects) 5 min read 2D Transformation | Rotation of objects 7 min read Point Clipping Algorithm in Computer Graphics 10 min read Line Clipping | Set 1 (Cohen–Sutherland Algorithm) 15+ min read Polygon Clipping | Sutherland–Hodgman Algorithm 15 min read Implementation of a Falling Matrix 5 min read Visible Surface DetectionA-Buffer Method 3 min read Z-Buffer or Depth-Buffer method 5 min read Back-Face Detection Method 3 min read 3-Dimension Object RepresentationSnowflakes Fractal using Python 3 min read Koch Curve or Koch Snowflake 4 min read Klee's Algorithm (Length Of Union Of Segments of a line) 9 min read Cubic Bezier Curve Implementation in C 11 min read Fractals in C/C++ 6 min read Open GLScan-line Polygon filling using OPENGL in C 8 min read Rendering a Triangle using OpenGL(using Shaders) 9 min read Getting started with OpenGL 4 min read OpenGL program for Simple Ball Game 5 min read OpenGL program for simple Animation (Revolution) in C 6 min read Translation of objects in computer graphics 7 min read Graphics function in Cpieslice() function in C 2 min read outtextxy() function in C 1 min read settextstyle function in C 2 min read outtext() function in C 1 min read setlinestyle() function in C 2 min read getx() function in C 2 min read sector() function in C 2 min read moveto() function in C 2 min read gety() function in C 2 min read getmaxx() function in C 1 min read lineto() function in C 2 min read arc function in C 2 min read bar3d() function in C graphics 2 min read moverel() function in C 3 min read cleardevice() function in C 1 min read closegraph() function in C 1 min read drawpoly() function in C 2 min read putpixel() function in C 2 min read getarcoords() function in C 2 min read getbkcolor() function in C 2 min read getmaxcolor() function in C 2 min read getpixel() function in C 2 min read setcolor function in C 2 min read imagesize() function in C 2 min read textheight() function in C 1 min read textwidth() function in C 1 min read grapherrormsg() function in C 1 min read fillpoly() function in C 3 min read fillellipse() function in C 1 min read bar() function in C graphics 2 min read MiscHow to add "graphics.h" C/C++ library to gcc compiler in Linux 2 min read How to include graphics.h in CodeBlocks? 2 min read Computer Graphics |Cathode Ray Oscilloscope| Cathode ray tube (video display technology) 5 min read High Definition Multimedia Interface (HDMI) 4 min read Common Video Format 2 min read Audio Format 3 min read Like