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l13_video - L13 - Video Video Take the graduate course,...

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L13 L13 - - Video Video Take the graduate course, 6.973 – consult Prof. Akinwande Some modifications of these slides by D. E. Troxel L13: 6.111 – Spring 2004 Introductory Digital Systems Laboratory 1
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Plasma Displays Plasma Displays Weber, SID 00 Digest, p. 402. L13: 6.111 – Spring 2004 Introductory Digital Systems Laboratory 8
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Raster Scan Raster Scan ± Television and most computer displays use raster scan. Non−Interlaced: Frame rate may Interlaced: Frames alternate. be 60, 72, etc. frames/sec. This is like television: 60 half Scan line frames/sec. Retrace line Electron beam "scans" tube. Beam location is shown here. Beam current determines brightness of display. L13: 6.111 – Spring 2004 Introductory Digital Systems Laboratory 11
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Composite Frames Composite Frames ± The ‘frame’ is a single picture (snapshot). ² It is made up of many lines. ² Each frame has a synchronizing pulse (vertical sync). ² Each line has a synchronizing pulse (horizontal sync). ² Brightness is represented by a positive voltage. ² Horizontal and Vertical intervals both have blanking so that retraces are not seen (invisible). Analog Video Composite Frame Vertical Sync and Retrace Blanking 1/60 sec Signal Horiz. Sync Pulses Horizontal Line Blanking u 51.8 sec u Active video: 63.6 sec Sync L13: 6.111 – Spring 2004 Introductory Digital Systems Laboratory 12
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Horizontal Synchronization Horizontal Synchronization ± The picture consists of white dots on a black screen. ² White is the highest voltage. ² Black is a low voltage. ² Sync is below the black voltage. ± Sync pulses are surrounded by the blanking interval so one doesn’t see the retrace. ~ ~ White Black Sync 0 V Digital Video Signal: Horizontal Sync: ~ ~ 3 V 0.8 V Blanking Sync Pulse "Front Porch" ~ "Back Porch" ~ 2 ~ ~ u ~ sec ~ 4.9 u sec sec ~ ~11.8 u L13: 6.111 – Spring 2004 Introductory Digital Systems Laboratory 13
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Composite Synchronization Composite Synchronization ± Horizontal sync coordinates lines. ± Vertical sync coordinates frames. ± They are similar except for the time scales and they are superimposed on each other. The numbers are for TV-like displays. ² What purpose is there for serrated sync? Non−serrated
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l13_video - L13 - Video Video Take the graduate course,...

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