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
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.
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.
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
An electron guns fire blue, red, and green electrons at the screen.
Little dots that are diffrent colors
How an image is formed on the tv screen
Real image
nope. bcoz the image is formed behind the mirror.
If an image can be formed on screen it is classified as real. Virtual images cannot be projected on an image.
Beacuse the image is formed behind the mirror after reflection. The image appears to be diverging from the Principal Focus.
computer maniter differs from tv images bacause desktops image is designed as to give a good and beautiful screen
Most likely Yes, you most likely need to get a video card with an S-cable.
CRT screen size
Large projection TV's work by making a small image and projecting it onto a larger screen exactly like a projector. The problem with these is that the image is not sharp unless you look directly straight at the screen.
Let's say that you want to have a really large-screen TV but can't afford one, or don't have the space for one. You can use a video projector to create a large TV image on any blank wall. You might need to make the room a little darker, because the projector will have a dimmer image than a backlit TV screen.
Only real images can be. In physics, real images are composed of light rays that converge to a focus for each point of the image. Thus they can be projected onto a screen. Virtual images have light rays which diverge as if they had come from points behind the source. Hence a screen will just be illuminated with unfocussed light. Outside of physics, the term "image" may also refer to any visible pattern or picture, in which case "projection", "real" or "virtual" don't mean a lot, though arguably, when you look at your TV or a postage stamp what you are seeing is a virtual image even though its all about as real as any image can be!
a virtual and erect image is always formed by a covering lence