Evolution of televisions, a5
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Transcript of Evolution of televisions, a5
EVOLUTION OF TELEVISIONS
Evolution of televisions
Then and now
TELEVISION
• Medium for transmitting and receiving moving images,
• Either monochromatic ("black and white") or color, accompanied by sound.
• One of the biggest advertisers.• Best medium of entertainment and awareness
Philo Farnsworth
BIRTH OF WORD TELEVISION
TELEVISION
INVENTOR OF TELEVISION
• John Logie Baird who was born on the 13th August 1888 in Helensburgh, Dumbarton,Scotland.
THE HISTORY/ TIMELINE
• 1900, Tesla granted U.S. patent
• 1904, Fleming invents the TV but not successful.
• 1906, First Christmas Eve program was shown,
• 1912, Radio signal amplifier deviced launched
• 1920, first scheduled commercial radio programmer launched,
• 1926, television system invented by JOHN LOGIE BAIRD,
• 1947, transventor is invented
• 1954, first coast-to-coast color TV transmission started.
TYPES OF TELEVISIONS• Cathode Ray Tube (CRT) – since the mid-1930s.• Rear Projection – The video image is projected
from inside the unit onto a mirror that reflects the image back to the screen.
• Front Projection- projector’s.• Plasma – flat-panel televisions, 42 to 56 inches on
average and are generally only available in larger sizes.
Liquid Crystal Display (LCD) – the most common type of television these days and are sizes from 15 to 55 inches.
Light Emitting Diode (LED) - uses light-emitting diodes (LEDs) to backlight the display.3D – conveys depth perception to the viewers.
MATERIAL USED
• CRT (cathode ray tube)• Tubes• Diodes• Resistors • capacitors and inductors • Chassis box made of wood and fibers.
EFFECTS ON SOCIETY
• Thanks to the News. • Entertains people with various television
shows.• Influence the way people think, and
manipulate their decisions• Promotes awareness in affective way.
TIMELINE OF THE TELEVISION
• In 1862 Abbe Giovanna Caselli invents his Pantelegraph and becomes the first person to transmit a still image over wires.
• Then in 1906 Lee de Forest built a vacuum tube that worked in the first mechanical working television.
• In 1940 Peter Goldmark invents the first color television with 343 lines of revolution.
• In 1948 cable television was introduced in Pennsylvania.
• In 1981 NHK demonstrates the HDTV which had 1,125 lines of revolution.
• In 1992 the first 21-inch full color plasma TV was introduced
• In 2010 the first 3-D televisions were put on the market.
ENVIRONMENTAL ASPECTS• Contains a lot of lead• LCD TVs use lamps that contain mercury so they
are harder to dispose of. • People don’t know how to dispose of televisions
properly.• Now there is a big concern about electronic
waste. • The newer TVs are requiring more electrical
power to run.
IMAGES
1920
1930
1940
1950
1960 1970
1990 2000
1980
2010 – 3D Generation
MAJOR CHANGES OF TELEVISIONS
• in 1936, coaxial cable was invented to transmit TV signals.
• The first TV started out with black and white pictures until 1940.
• in 1948 cable became available and provided more channels .
• 1956 - first remote control was made for the TV that was made with wires.
• Later the first HDTV was made for viewers to get a better and higher quality image.
• And in 2010 the first 3D TVs were sold letting viewers watch their programs in 3D.
COMPLETED AND SUBMITED BYSAHIL MUKHIA
THANK YOU