Fundamentals of Computer Graphics Third Edition by Peter Shirley and Steve Marschner. Image quality dependent on viewing angle. Because of the physical nature of the LCD matrix, it is difficult to make the individual LCD pixels very small. Usually black space between pixels to separate the filters. Color is obtained by placing filters in front of each LCD element. LCDs elements do not emit light, use backlights behind the LCD matrix. Level of voltage controls gray levels. LCD elements are arranged in an n x m array call the LCD matrix. Liquid crystal displays use small flat chips which change their transparency properties when a voltage is applied. Next frame of movie is broken into next three fields (even, odd, even)…. Next frame of movie is broken into next two fields (even, odd). First frame of movie is broken into first three fields (odd, even, odd). Problem: 24 film fps must be converted to. Faster movements and increased audio pitch are considered perceptually acceptable. American films are played ‘as is’ in Europe, resulting in everything moving 4% faster. European film projectors play film at 25 fps. To reduce flicker, shutter opens twice for each frame – resulting in 48 fps flashing. Projectors have a shutter to block light during frame advance. Vector displays are not suitable for realistic shaded scens. Can draw 100,000 short lines at this refresh rate. Number of lines derive Refresh rate and refresh cycle is between 30 and 60 per second. 
Picture definition is stored as a set of line-drawing commands stored in a refresh display file.
Used in line drawing and wireframe displays.The electron beam illuminates only the parts of the screen where a picture is to be drawn.For example 1280 x 768 has an aspect ratio of 5:3.The AspectRatio is the ratio between number of scan lines in a rater and the number of pixels in a scan line necessary to produce equal length lines in both directions on the screen.Adjacent points will appear distinct as long as their separation is greater than the diameter at which each spot has intensity of about 60% of that at the center of the spot.The intensity distribution of spots on the screen has Gaussian distribution.Higher the resolution, better the graphics system.Resolution is related with quality of the graphics system.Higher the resolution,smaller the spot size.The Resolutionis defined as the number of dot per inch or centimeter that can be plotted horizontally & vertically.Picture elements stored in memory are called FrameBuffer.A rectangular array of points or dots is called Raster.E N D - Presentation TranscriptĬomputer Graphics Lecture 04 FasihurRehman
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