INTRODUCTION TO TELEVISION

- K. Vishnu MCA       KanchiLUG Member

   

Television history was not

overnight and not invented by a

single inventor.

   

MECHANICAL TELEVISION

   

- John Logie Baird (1920)

  The idea of using arrays of

transparent rods to transmit

images for television.

   

- Charles Francis Jenkins (1923)

      Radiovision claimed to have

transmitted the earliest moving 

silhouette images.

   

ELECTRONIC TELEVISION CRT

   

Electronic television is based on the

development of the cathode ray tube.

   

Now it is the picture tube

found in modern TV sets.

   

MAIN INVENTORS OF CRT TELEVISION

   

Vladimir Kosma Zworykin (1925)

   

Philo T. Farnsworth (1939)

   

1. Glass Tube

2. Electron Gun

3. Electron Beam

4. Upper & Lower Leds

5. Shadow Mask

6. Phosporous Coated Screen

   

   

   

LCD TELEVISION

   

* An LCD TV is a flat panel TV

* It based on liquid crystal display

* Inter active properties

# liquid crystals # light

   

   

* The liquid crystals are broken down into small particles.

* These smaller particles are known as pixels.

* Crystals are located in the middle of two electrodes.