television in education

1. -Mary Ashmy

2.  A television, commonly referred to as TV, telly or
the tube, is a telecommunication medium used for
transmitting sound with moving images
in monochrome (black-and-white), or in colour, and in
two or three dimensions

3. Story of Television

4. History in a nut shell
 Paul Nipkow proposed and patented the first
electromechanical television system in 1884, but he could
not develop a system that worked. In 1925, the first publicly
demonstrated working system in the history of television,
created by John Logie Bard, displayed a moving silhouette.
In 1928, Baird broadcasted the first transatlantic signal and
the first regularly scheduled television service began, and
in 1931, the first live transmission was made
 The first fully electronic set in the history of television was
created in 1927 by Philo Taylor Farnsworth, but it wasn’t
until 1934 that he created one that worked well.

5. History in a nut shell
 The first color transmission was demonstrated by Baird in
1928, and the first color transmission of the electronically
scanned era in 1940. Color television field tests began in
1941, but because of World War II and other circumstances,
the first color broadcast to the public did not occur until
1951. It was in the 1966-1967 season that the networks
began broadcasting in full color for prime time television
 The history of television continues to advance even today.
From it’s invention, it has gotten bigger and bigger, of
better quality, and more popular. Ninety-eight percent of
homes in America had at least one television by the late
1980’s.

6. Making of TV
 Housing
Almost all television housings are made of plastic by
the process of injection molding, in which precision
molds are made and liquid plastic is injected under
high pressure to fill the molds. The pieces are released
from the molds, trimmed, and cleaned. They are then
assembled to complete the housing. The molds are
designed so that brackets and supports for the various
components are part of the housing.

7. Making of TV
 Picture tube
The television picture tube, or cathode ray tube (CRT), is
made of precision glass that is shaped to have a slightly
curved plate at the front or screen. It may also have a dark
tint added to the face plate glass, either during production
of the glass or by application directly to the inside of the
screen. Darker face plates produce improved picture
contrast. When the tube is manufactured, a water
suspension of phosphor chemicals is allowed to settle on
the inside of the face plate, and this coating is then overlaid
with a thin film of aluminum that lets electrons pass
through. The aluminum serves as a mirror to prevent light
from bouncing back into the tube.

8. Making of TV
 Audio system
The housing also contains fittings for speakers, wiring, and
other parts of the audio system. The speakers are usually
made by a specialized manufacturer to the specifications of
the television manufacturer
 Electronic parts
When the picture tube and the audio speakers and
attachments are assembled in the set, other electronic
elements are added to the rear of the set. The antennae,
cable jacks, other input and output jacks, the electronics
for receiving remote control signals, and other devices are
prepared by specialty contractors or as subassemblies else-
where on the assembly line.

9. Quality Control
 As with all precision devices, quality control for the
manufacture of the television is a rigid process.
Inspections, laboratory testing, and field testing are
performed during the development of prototypes and
throughout manufacture so the resulting television is
not only technologically sound but safe for use in
homes and businesses.

10. Byproducts/Waste
 There are no byproducts from the manufacture of the
television, although many other devices are a part of
the television "family" and are often produced by the
same manufacturer. These include the remote control,
computer monitors, video recorders (VCRs), laser disc
players, and a host of devices that may require
compatible design and components
 Wastes may include metals, plastics, glass, and
chemicals. Metals, plastics, and glass are isolated and
recycled unless they have been specially treated or
coated.

11. TV’s ..getting smarter and smarter

12. Broadcast Television

13. Satellite TV

14. Cable Television

16. The Future
 The future of television is now. High Definition Television
(HDTV) was developed by the Japanese Broadcast
Corporation and first demonstrated in 1982
 Liquid crystal display (LCD) technology is also advancing
rapidly as an alternative to the cumbersome television
screen
 The factories themselves will soon be producing hybrids in
which the television, computer monitor, and telephone are
a single unit, although this development will take further
improvements in compatibility between machines that
speak analog versus digital language and the creation of
PC-to-video bridges