How TV works

There are about a dozen types of TVs on the modern market. Some of them are very popular due to the ideal price-quality ratio. Some are not so popular because they can be expensive and do not provide the necessary quality. To choose the right device, you need to compare all modern types of TVs.

How the TV works

The process of transferring images to TVs is very simple:

1. Television cameras contain elements for processing light. Thanks to them, light radiation is converted into certain electrical signals.
2. After the signal is received, it is processed and broadcast.
3. The back of the device contains 3 electron guns. After the television signals are received, the guns create electrons. They are directed to the inside of the device. This part of the TV is covered with phosphor. This substance and electrons come into contact, creating light.
4. Thanks to the glow of blue, green and red colors, an image is created on the TV screen.

CRT

Also called a CRT device. Used to be the only type of TV available to people. They were very popular because there was no worthy replacement. Modern models are equipped with screens from 10 to 40 inches. Weight from 5 to 50 kg, depending on size. These devices are not thin and their depth can exceed 40 cm. The viewing angle is up to 180 degrees.The service life can exceed 30 years. The amount of energy consumed is from 50 to 140 W/h. This indicator depends on the size.

Advantages of kinescope models:

1. Long service life. Can exceed even the most popular LCD TVs.
2. Budget savings.
3. Good viewing angle.

But kinescope devices have many disadvantages:

1. Takes up a lot of space due to its large size.
2. It weighs a lot. It is difficult to carry in your hands.
3. The image quality is poor.
4. The screen may flicker and this will reduce the performance of your eyes.
5. The TV is sensitive to magnetic fields.
6. Consumes quite a lot of energy.
7. Only analog signal is present.

Attention! CRT TVs work thanks to a beam tube. It directs the electron beam to the phosphor. The latter begins to glow, creating pixels on the screen. And thanks to the radio signal, they create an image.

Plasma

According to a company that monitors demand for televisions, plasma panels are the second most popular after LCD panels. Screen sizes from 30 to 80 inches.

You can find smaller models, but the price will be too high for panels of this size. The weight of plasma TVs is less than 5 kg, even the largest devices. The viewing angle is very wide 180 degrees. Such TVs last up to 15 years. They consume a lot of energy (the largest ones exceed 150 W/h). The price of the device depends on the size.

Plasma panels have their advantages:

1. The image is very high quality. Excellent reproduction of dark and colored scenes.
2. Larger devices are good in terms of quality and price.
3. These TVs last a long time.
4. The response time is short.

But the device also has disadvantages:

1. The plasma panel consumes a lot of energy. Therefore, this option is considered uneconomical.
2. There is no anti-reflective coating.
3. They can overheat greatly.

Some companies are beginning to abandon the production of plasma panels. The reasons are the disadvantages that these TVs have (constant overheating and wasting a lot of energy). That is why people began to give preference to liquid crystal models.

Reference! The image is formed by glass capsules containing inert gases. These capsules come into contact with the phosphor, creating pixels. Electrical discharges contribute to the appearance of the image.

Projection

The sizes and functionality of projection models vary, depending on the manufacturer.

Advantages of projection models:

1. Ability to adjust the scale. Because of this, there will be no problems with choosing a diagonal; the projection size can be increased and decreased, making the image small or large.
2. Very easy to use. To increase the image size you only need to turn the special wheel.

But such designs have many disadvantages:

1. The image size increases at the cost of quality loss.
2. Large dimensions due to thickness. In addition, you will have to look for a place for the screen (white paper).
3. High price. Special lamps are installed inside, the price of which can exceed plasma and liquid crystal devices.
4. May overheat during operation. This can be avoided by purchasing a cooler, but it is an additional expense.
5. During operation, they produce noise that can interfere with acoustics.
6. Low service life (no more than 2 years). Most often, it becomes even smaller due to constant overheating.In addition, a sudden power outage significantly reduces the service life.

Such devices create an image projection. The operating process is as follows: a small image of very high quality is created and, using an optical system, it is projected onto the screen. The projector screen is a large white paper. The image can fall either on the entire area of ​​the paper or on its individual parts.

Liquid crystal

Liquid crystal devices are considered the most popular among televisions. They are the ones that are in greatest demand on the market. Screen sizes range from 12 to 65 inches. There are also small, portable models that are less than 10 inches in size. TVs don't weigh much (even the heaviest ones will weigh around 4kg). They are also thin (less than 5 cm thick). The shelf life of the TV is quite long (up to 20 years). Energy consumption is less than other devices (40 Wh or less). Also, TVs are protected from glare thanks to a special anti-glare coating.

Note! When choosing an LCD TV, you should pay special attention to the viewing angle. Liquid crystal devices cannot boast of good criteria. Viewing angle is the maximum angle that allows you to transfer an image to the screen without losing quality. The latter depends on contrast and brightness.

LCD TVs have their advantages:

1. Consumes little energy.
2. The TV body is very thin. Thanks to this, it takes up little space. You can also hang the TV on the wall so that it doesn't take up any space at all.
3. The display is covered with an anti-glare layer.
4. The panels do not overheat. Temperature no more than 30 degrees.
5. Long service life (up to 20 years).
6. Ideal balance between price and quality.

But even the most popular devices have some disadvantages:

1. The viewing angle is smaller than that of plasma models.
2. The response time is quite long.

The device is based on liquid. It consists of molecules. Thanks to the electric field, they change their location. Light passes through them and this creates a picture.

Which TV is better

It is impossible to say which overall device is the best. People are buying all kinds of devices. Most preference is given to liquid crystal models, because they consume a minimum of energy, take up little space and last a long time. But even they have disadvantages (long response time and smaller viewing angle compared to other types). Plasma models are also often preferred. The image quality is very high and the response time is fast. But they consume a lot of energy and overheat greatly.

Cinescopic devices are in good demand, as they are well designed and capable of processing many functions. People have already gotten used to them, they last a very long time (up to 30 years), and their price is the lowest. But such TVs cannot boast of high-quality images and take up a lot of space. Projection models are the least popular. They are more suitable for showing presentations or movies than for constant TV viewing, and they have a very low lifespan.

After weighing all the pros and cons, and thinking about what is most important to us, we can make a choice.