Television: 1939 Du Mont Model 181Vector DisplaysRaster ScanningRaster ScanningRaster ScanningRaster ScanningRaster ScanningNTSC or RS-170A Line of B&W VideoInterlaced ScanningInterlaced ScanningInterlaced ScanningInterlaced ScanningInterlaced ScanningInterlaced ScanningInterlaced ScanningColor TelevisionInternational StandardsComputer Video: VGAVGA TimingDetailed VGA TimingVideoProf. Stephen A. [email protected] UniversitySpring 2006Video – p. 1/12Television: 1939 Du Mont Model 181Video – p. 2/12Vector DisplaysVideo – p. 3/12Raster ScanningVideo – p. 4/12Raster ScanningVideo – p. 4/12Raster ScanningVideo – p. 4/12Raster ScanningVideo – p. 4/12Raster ScanningVideo – p. 4/12NTSC or RS-170Originally black-and-white60 Hz vertical scan frequency15.75 kHz horizontal frequency15.75 kHz60 Hz= 262.5 lines per fieldWhite 1 VBlack 0.075 VBlank 0 VSync− 0.4 VVideo – p. 5/12A Line of B&W VideoSyncBlankBlackWhiteHFront Porch: 0.02HSync: 0.08HBack Porch: 0.06HBlanking: 0.16HVideo – p. 6/12Interlaced ScanningVideo – p. 7/12Interlaced ScanningVideo – p. 7/12Interlaced ScanningVideo – p. 7/12Interlaced ScanningVideo – p. 7/12Interlaced ScanningVideo – p. 7/12Interlaced ScanningVideo – p. 7/12Interlaced ScanningVideo – p. 7/12Color TelevisionColor added later: had to be backwardscompatible.Solution: continue to transmit a “black-and-white”signal and modulate two color signals on top of it.RGB vs. YIQ colorspaces0.30 0.59 0.110.60 −0.28 −0.320.21 −0.52 0.31RGB=YIQY baseband 4 MHz “black-and-white” signalI as 1.5 MHz, Q as 0.5 MHz at90◦:modulated at 3.58 MHzVideo – p. 8/12International Standardslines active vertical aspect horiz. framelines res. ratio res. rateNTSC 525 484 242 4:3 427 29.94 HzPAL 625 575 290 4:3 425 25 HzSECAM 625 575 290 4:3 465 25 HzPAL: Uses YUV instead of YIQ, flips phase of Vevery other lineSECAM: Transmits the two chrominance signalson alternate lines; no quadrature modulationVideo – p. 9/12Computer Video: VGA1 2 3 4 5Red Green Blue ID2 GND6 7 8 9 10RGND GGND BGND (+5V) GND11 12 13 14 15ID0 ID1 hsync vsync ID3ID2 ID0 ID1- - GND Monochrome, < 1024×768- GND - Color, < 1024×768GND GND - Color, ≥ 1024×768DDC1ID2 Data from displayvsync also data clockDDC2ID1 I2C SDAID3 I2C SLCVideo – p. 10/12VGA TimingMode Resolution Vertical Horizontal Pixel ClockVGA 640×350 70 Hz 31.5 kHz 25.175 MHzVGA 640×400 70 Hz 31.5 kHz 25.175 MHzVGA 640×480 59.94 Hz 31.469 kHz 25.175 MHzSVGA 800×600 56 Hz 35.2 kHz 36 MHzSVGA 800×600 60 Hz 37.8 kHz 40 MHzSVGA 800×600 72 Hz 48.0 kHz 50 MHzXGA 1024×768 60 Hz 48.5 kHz 65 MHzSXGA 1280×1024 61 Hz 64.2 kHz 110 MHzHDTV 1920×1080i 60 HzUXGA 1600×1200 60 Hz 75 kHz 162 MHzUXGA 1600×1200 85 Hz 105.77 kHz 220 MHzWUXGA 1920×1200 70 Hz 87.5 kHz 230 MHzVideo – p. 11/12Detailed VGA Timing640 × 480, “60 Hz”25.175 MHz Dot Clock31.469 kHz Line Frequency59.94 Hz Field Frequencypixels role8 Front Porch96 Horizontal Sync40 Back Porch8 Left border640 Active8 Right border800 total per linelines role2 Front Porch2 Vertical Sync25 Back Porch8 Top Border480 Active8 Bottom Border525 total per fieldActive-low Horizontal and Vertical sync signals.Video – p.
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