How an image is formed on TV screen?

Answer 1

When you watch TV, your eyes see moving images. But you are really watching still pictures. That's because the images change so quickly(about 30 times every second!) that as far as your eyes are concerned, what you see is actually moving.

Your television collects electric signals from radio waves sent through the air (or from a VCR or DVD player hookup or through cable wires) to the television's antenna. Wherever the elctric signals come from, the television does the same job with them-it converts them to sound and pictures.

To show the pictures, your television uses a system of many dots, called pixels. Imagine each pixel as a box on graph paper (only much, much tinier!). The television signals tell which box to make red, which to make green, and which to make blue in order to create a picture on screen. When all of these tiny pixels appear on the screen, your brain reads them as one complete image. Tammi

Answer 2

The LCD screen is made up of two sheets of polarizing material with a layer of liquid crystals sandwiched in between. When a charge is passed through this film, the crystal alignment changes and becomes opaque to light emitted from behind or reflected light. This is the technique used for image rendering. Thus, light modulation of liquid crystals is the basis of the LCD technology.

Answer 3

Here is the short version. Because the word 'tube' is in the question it refers to the picture tube TV rather than LCD, LED, etc.

A heated element in the back of the tube sends out a continuous beam of electrons. When the electrons strike a phosphor on the inside of the picture tube, the phosphor glows. The amount of electrons flowing can be controlled to produce lighter and darker areas on the screen.

Two electromagnets deflect the electron beam. The first send the beam rapidly back and forth across the screen. The second causes the beam to move slowly down the screen and then jump back to the top. In this way the entire screen is covered in about 1/60 second. There are about 400 lines back and forth in that time. The beam strength is adjusted hundreds of times in each line to make the tiny light and dark areas that make the picture.

Color adds several items of complexity and the description is beyond what can be done in this space. The related link for How Stuff Works might be interesting.

Answer 4

Televisions are build different ways if you are watching on a old TV it is monitored and sent by pictures but if you own a LCD it is shown by 9 layers of liquid crystal and a LED is a bunch of light diodes changing its color and creating pixels.......

All TV are shown with pixels

Answer 5

An electron guns fire blue, red, and green electrons at the screen.

Answer 6

Little dots that are diffrent colors