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HDTV.....

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Information about HDTV.....
Science-Technology

Published on September 26, 2010

Author: ABHI826

Source: authorstream.com

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SEMINAR on HDTV : Submitted by: ABHISHEK SHARMA 0713331005 ECE- VIIA SEMINAR on HDTV CONTENTS : INTRODUCTION HISTORY OF TELEVISION WHY HDTV ? CONTENTS HISTORY : In the United States, the National Television System Committee (for which the NTSC standard is named) standardized on 525 lines at 30 fps in 1940, with regular broadcasts starting on July 1,1941. NTSC standard was updated to include first a non-compatible 441-line color standard in 1950, which was replaced by a compatible 525-line, 29.97fps color standard approved in 1953 and used to this day. Current high definition video standards were developed during the course of the advanced television process initiated by the Federal Communications Commission in 1987 at the request of American broadcasters FCC process, led by the Advanced Television Systems Committee (ATSC) adopted a range of standards from interlaced 1080 line video with a maximum frame rate of 30 fps, and 720 line video, progressively scanned, with a maximum frame rate of 60 fps. The FCC officially adopted the ATSC transmission standard (which included both HD and SD video standards) in 1996, with the first broadcasts on October 28, 1998. HISTORY INTRODUCTION : High-definition television (or HDTV, or just HD) refers to video having resolution substantially higher than traditional television systems (standard-definition TV, or SDTV, or SD). HD has one or two million pixels per frame, roughly five times that of SD. Early HDTV broadcasting used analog techniques, but today HDTV is digitally broadcast using  video compression. INTRODUCTION Why the Change to HDTV ? : Increase number of programs local broadcasters can provide Improve the Quality of Picture and Sound Converting to HDTV will also free up parts of the scarce and valuable broadcast airwaves.  Those portions of the airwaves can then be used for other important services. Why the Change to HDTV ? Analog vs. Digital Television : Analog TV – AM vestigial sideband 6 MHz of bandwidth per channel plus the audio High power transmitters for coverage – 45 to 75KW Avg. Out Noise and multi-path interference common Digital TV – 8VSB MPEG-2 Stream 6 Mhz Channel can produce multiple programs viewable with ATSC tuner (multicasting) 5 to 7.5 KW Average Transmitter Output Power Austin Broadcasters - 98 KW to 1.5 MW ERP Received picture is either perfect or not at all 5.1 Surround Sound UHF Channel Spectrum Analog vs. Digital Television Digital TV Quality Levels : Standard Definition TV (SDTV) - SDTV is the basic level of quality display and resolution for both analog and digital. Transmission of SDTV may be in either the traditional (4:3) or wide screen (16:9) format. Enhanced Definition TV (EDTV) - EDTV is a step up from Analog Television. EDTV comes in 480p wide screen (16:9) or traditional (4:3) format and provides better picture quality than SDTV, but not as high as HDTV. High Definition TV (HDTV) - HDTV in wide screen format (16:9) provides the highest resolution and picture quality of all digital broadcast formats. Combined with digitally enhanced sound technology, HDTV sets new standards for sound and picture quality in television. (Note: HDTV and digital TV are not the same thing -- HDTV is one format of digital TV.) Digital TV Quality Levels PIXELS : PIXELS Face plate picture elements (pixels) are formed by depositing and patterning a black matrix, standard red, green, and blue TV phosphors and a thin aluminum layer to reflect colored light forward to the view HDTVs : LCD TV TFT TV PLASMA TV LED TV HDTVs LCD TV : Most mature flat panel technology Major share of FPD market Poor intrinsic viewing angle Requires backlight Inefficient Slow Effected by Temperature and sunlight LCD TV POLARIZATION TECHNIQUE IN LCD DISPLAY : POLARIZATION TECHNIQUE IN LCD DISPLAY TFT TV : Thin film transistor liquid crystal display (TFT-LCD)  uses thin-film transistor (TFT) technology to improve image quality TFT LCD is one type of active matrix LCD Transistors are made from a thin film of amorphous silicon deposited on a glass panel. Multi-domain vertical alignment. TFT TV PLASMA TV : PLASMA TV : HDTV plasma televisions usually have a resolution of 1,024×768. The xenon, neon, and helium gas in a plasma television is contained in hundreds of thousands of tiny cells positioned between two plates of glass.  The address electrodes sit behind the cells, along the rear glass plate. The transparent display electrodes, which are surrounded by an insulating dielectric material and covered by a magnesium oxide protective layer, are mounted in front of the cell. a voltage difference between front and back electrode causes the gas to ionize and form a plasma. As the gas ions rush to the electrodes and collide, photons are emitted. LED TV : LED TV is an LCD TV that uses LED backlighting rather than fluorescent lights used in traditional LCD televisions. Two types of LEDs may be used. Edge-LEDs technology is used for backlighting.ss LED TV COMPARISON : LED-backlit LCD TVs differ from conventional CCFL-backlit LCD TVs in the following: They can produce an image with greater dynamic contrast compared with CCFL-backlit LCD TVs. With Edge-LED lighting they can be extremely slim. Current models on the market can be approximately one inch thick.[6] They can offer a wider color gamut, especially when RGB-LED backlighting is used.  Lesser environmental pollution on disposal.[6] Higher cost due to current market product placement.[6] Generally have a lower power consumption in the realm of 20-30%.[6] COMPARISON FUTURE OF HDTV : However, lots of progress has been done in the field of HDTV technologies ,HDTV still has much lower resolution than 70mm film. It’s a matter of time before some will begin pressuring for another increase in quality. FUTURE OF HDTV CONCLUSION : As old analog techniques retires, HDTV programming, products, and production services will continue to grow exponentially. Move will be cheaper, quicker, and easier as products and services become more widespread and people grow accustomed to the new technology. HDTV has brought a more cinematic experience into viewer’s homes and with digital cinema, delivered the film industry a few of the benefits of television. CONCLUSION Slide 19: THANK YOU

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