What is the Hertz frequency on TV

When choosing a TV, the user should take into account the technical characteristics of each model. These parameters directly affect the quality of the broadcast image and the viewing comfort. What is the refresh rate of the screen? What exactly does the value measured in Hertz mean? We will carefully study this characteristic, as well as provide specific recommendations for choosing a TV.

What is the refresh rate

Laptop monitors, PCs and TV displays operate on a frame-by-frame basis. This technology is somewhat similar to the work of a movie projector. What is the refresh rate for a comfortable viewing experience? In a TV, this index should noticeably exceed the analogous parameter in a movie projector. It is extremely simple to explain the sounded pattern: it is much easier to form a video sequence on film than on a liquid crystal display. What does the parameter under consideration affect? To a greater extent on the detail and clarity of the picture. Therefore, the higher the frequency, the higher the quality.

Remember that this parameter is measured in hertz – the reduction in Hz. The number of Hertz displays how many frames the TV reproduces in 1 second. It is generally accepted that the sweep frequency should be at least 200 Hz. However, it is necessary to familiarize yourself with those. full description of the TV. Screen resolution plays a huge role. For example, if your device supports 4K, then 120Hz will be more than enough. Screens with a frequency of 50 Hz are outdated models, unable to properly reproduce dynamic scenes. The sudden change of frames leads to the fact that the clarity of the image is reduced.

Many people confuse this parameter with the frequency of filming, which is equivalent to 24 frames per second. There is also a television broadcasting frequency of 50 frames per second. There are three categories of screens on the modern market:

  1. The 50Hz to 90Hz models are the cheapest screens. Despite the excellent picture detail, the image looks washed out during dynamic frame changes. It is possible that there will be a flickering effect. First, it makes viewing less comfortable. Secondly, constant flickering negatively affects the viewer’s vision.
  2. Screens with a scan rate of 100-200 Hz are the best option in terms of value for money. Mostly such TVs are bought by users. Such models are presented in a wide range in the middle price segment.
  3. Devices with a refresh rate over 600 Hz are flagships with a rather high price tag. Experts believe that the average user will not see tangible differences in the viewing process.

We figured out the interpretation of the term “screen refresh rate”. However, there are other aspects that determine the quality of the image transmitted to the screen.

Types of LCD screens

The scan rate is an important parameter, but the type of LCD monitors must also be considered. What kind of liquid crystal display technology is capable of delivering high quality images? It is difficult to unequivocally answer this question. To give the most objective assessment, let’s analyze the most common types of screens.

This type of display is the first generation of liquid crystal screens. The bottom line is that image formation is carried out through CCFL fluorescent illumination. This technology is outdated and therefore unable to provide realistic and high quality images.

A refresh rate of 100 Hz or higher is required for the LCD display to provide adequate picture quality. If you buy a device with a lower scan ratio, then the image will be too blurry.

This is an improved version of the first generation displays. The main changes were made to the backlight, since it consists of LEDs. The principle of the arrangement of the diodes directly depends on what kind of TV model we are talking about. This is an extremely important characteristic as it determines the quality of the broadcast image.

To watch TV comfortably and avoid the flickering effect, you need to buy a Full LED, True LED or Direct LED TV. The peculiarity of these variations lies in the location of the LEDs. They are located around the entire perimeter of the display. LCD screens with the Edge LED designation are characterized by the arrangement of diodes on the sides. Such TVs are much cheaper, but the picture quality will be noticeably lower.

 

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This is the most advanced technology. The best OLED TVs are capable of delivering high quality natural images. Devices with such markings began to go on sale in 2015. The developers managed to noticeably increase the clarity of the picture. It was decided to abandon the backlight.

How was the image quality increased? The introduction of new technology has made it possible to get rid of flicker. OLED TVs have different refresh rates. However, it is better to stick with a model with an indicator from 100 Hz to 200 Hz. Devices of this type have an optimal price-performance ratio.

Plasma

Plasma monitors also do not need additional illumination. This is largely due to a completely different technology for image structure. Plasma TVs are able to provide the maximum depth of the broadcast image. Especially if we draw parallels with other types on the market.

The main disadvantage is the limited operational life. In just a few years of operation, the screen burns out, as a result of which the image quality drops. Therefore, today plasmas are extremely rare on the market. They gave way to more durable models.

The most up-to-date offers

What TV frequency is best for the viewer? The main thing is that this figure is not less than 100 Hz. We talked about this earlier. However, the sweep frequency of modern models fluctuates in the range of 600-800 Hz. Devices with such specifications must be Sub-Field Driving capable. According to the developers, the presence of this option can significantly increase the original image quality.

Many experts are extremely skeptical about models with excessively high frequencies, for example, 500-700 Hz. It is very easy to explain this, when LCD displays first appeared, many companies indicated technical specifications for marketing purposes that did not correspond to the real capabilities of technology. As a result, the cost of TV increased significantly, while the image quality remained unchanged.

Experts emphasize that the parameters of TVs produced by popular companies are fully consistent with the declared indicators. To ensure comfortable viewing, you must first purchase high-quality peripheral equipment. It is this that will allow you to watch television with a high-quality image.

What else is important for a high-quality picture

To choose a TV capable of broadcasting a high-quality image with maximum detail, you need to take into account not only the frequency, but also other criteria. We will talk about them now. Let’s start with the contrast and brightness of the picture. The contrast level determines the color range. This parameter is specified in the specifications in a ratio format. This parameter demonstrates the difference between dark and light areas.

There are 2 types of TV contrast:

  • statistical – indicates the maximum difference in brightness within one frame;
  • dynamic – determines the total difference between light and dark areas of the scene.

For statistical contrast, the optimal ratio is 1000: 1. As for the dynamic one, it all depends on what kind of TV model we are talking about. Brightness determines how dim and faded the displayed image will be on the screen. For high-quality TVs, this parameter varies in the range of 300-450 cd / m2.

Screen diagonal is another extremely important parameter that has a direct impact on the viewing comfort. Manufacturers have developed a list of recommendations that will allow you to choose the right TV diagonal as much as possible:

  • the recommended distance from the screen to the viewing point (we are talking about 2D format) – three diagonals of the TV;
  • if you plan to render content in 3D, then you need to reduce the distance to about 1.5 diagonal. It is necessary to choose a TV with such a diagonal that it covers the peripheral vision.

Let’s assume you have purchased a 55 ″ device. The distance from TV to the viewing point should be slightly more than four meters. Of course, sitting so far from the TV will not be very comfortable. Also keep in mind that 4K devices allow you to sit much closer.

The territorial location of the equipment should also be taken into account:

  • large TVs with a diagonal of over 46 inches are the optimal solution for the living room;
  • 32-inch models are ideal for children’s rooms and bedrooms;
  • in the kitchen, it makes sense to buy a small TV with a 26-inch diagonal.

It is necessary to take into account the basic criteria for choosing a diagonal, but you can always make an allowance for the individual preferences of the user.

Mostly all users who choose TV for themselves first of all look at the diagonal. It is necessary to consider several criteria to select the optimal parameter.

 

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TVs with a screen resolution of 720 pixels are on the market less and less. Even 5 years ago, 1080p models cost almost twice as much as devices with lower resolution, but now the situation has changed noticeably. Therefore, today it makes no sense to buy a 720p TV, it’s easier to take a more modern model.

Let’s give a concrete example. A TV Samsung UE24H4080 with a screen resolution of 720 pixels costs 12,500 rubles on average, and a Samsung T24D391EX (similar diagonal) with a resolution of 1080 pixels costs 13,400 rubles. The difference is only 900 rubles. It’s easier to pay a little extra to watch movies, TV series, sports broadcasts and Full HD broadcasts.

When we choose a TV, we often come across such a parameter as the frame rate – Hz. TV manufacturers advertise their own technology as the best solution in the LCD TV market, promising us the best picture quality. And marketers are actively using various tricks when calculating the coveted parameter.

In the technical specifications, the manufacturer often indicates considerable numbers – 100, 200, 400, 600, 800, 1200Hz and so on.

In this article, we will find out the impact of this parameter on the image quality, as well as refute the well-known myths and misconceptions associated with the frequency of the TV.

What is the refresh rate of a TV?

Do not confuse the refresh rate of the LCD matrix with the refresh rate of the video frame.

The frame refresh rate is the number of frames of video content displayed on the TV screen in a period of 1 second. The frequency directly depends on the type of content.

The standard frame rate of a shot is 24 frames per second.

The frequency of TV content is 50 frames per second (in European countries).

Refresh rate is a parameter that means how many frames per second an LCD TV can display, this value will not improve the picture quality in movies.

Where would a higher refresh rate LCD be useful?

For example, when connected to a computer, a 120Hz LCD TV will display smoother animations in Windows. With a supporting video card, you can get a good picture in games.

Why do we need extra Hz?

In old CRT TVs with a screen diagonal of more than 70 cm, at a standard frequency of 50-60 Hz, strong flickering was observed, which gave additional strain on the eyes.

The reason for this was not a low number of personnel, but a feature of the technology itself. Therefore, engineers have developed a CRT TV with a refresh rate of 100 Hz. With such a frequency, the picture did not blink, and the eyes did not get tired.

That is why there was a misconception that a TV with a high frequency value does not affect vision.

In an LCD TV with a frequency of 60 Hz, there is no flicker, and an increase in the frequency indicator is necessary for completely different purposes.

100,200,400,800 Hz technology

The main disadvantage of LCD TVs is a decrease in the resolution of the displayed frame in dynamic scenes.

Dynamic resolution is affected by the response of the sensor, caused by the slow switching of liquid crystals from the current color to completely black and back. An example of high-quality display of fast scenes in films is any plasma TV.

1.Application of LED illumination to increase dynamic resolution – scanning illumination. The easiest method. The effect on the clarity of the picture is noticeable, but at the same time the brightness value decreases and flickering is observed. The benefits of this feature are ambiguous. Used in budget TVs.

  1. Inserting additional frames. The technology requires a powerful processor and is used in mid-range models.

The impact on the picture in dynamic scenes is significant. There are a number of disadvantages:

– if this function is used when watching ordinary films, then the effect of the performance will appear:

– when creating additional frames, significant artifacts are observed in the form of incorrect frame overlap and afterimage.

  1. Combined method. The above technologies and various algorithms for processing, smoothing and eliminating image defects. The best solution. You can adjust the creation of additional frames and the degree of suppression of the blur effect in dynamics separately. Thus, to obtain high dynamic resolution in movies (24fps) without the effect of the spectacle.

The numerical value indicated in the characteristics is the image processing index, the sum of which includes the work of all TV technologies. Moreover, the efficiency of the index does not depend on the numerical value.

Output.

There is no need to chase the Hz value, this is a marketing ploy to sell a TV at a higher price. The quality of the picture depends on the set of technologies used to improve the picture. Frequency over 100 Hz makes sense to be in TVs with 3D image support, in other cases do not chase this value.

 

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When we choose a TV, we often come across such a parameter as the frame rate – Hz. TV manufacturers advertise their own technology as the best solution in the LCD TV market, promising us the best picture quality. And marketers are actively using various tricks when calculating the coveted parameter.

In the technical specifications, the manufacturer often indicates considerable numbers – 100, 200, 400, 600, 800, 1200Hz and so on.

In this article, we will find out the impact of this parameter on the image quality, as well as refute the well-known myths and misconceptions associated with the frequency of the TV.

What is the refresh rate of a TV?

Do not confuse the refresh rate of the LCD matrix with the refresh rate of the video frame.

The frame refresh rate is the number of frames of video content displayed on the TV screen in a period of 1 second. The frequency directly depends on the type of content.

The standard frame rate of a shot is 24 frames per second.

The frequency of TV content is 50 frames per second (in European countries).

Refresh rate is a parameter that means how many frames per second an LCD TV can display, this value will not improve the picture quality in movies.

Where would a higher refresh rate LCD be useful?

For example, when connected to a computer, a 120Hz LCD TV will display smoother animations in Windows. With a supporting video card, you can get a good picture in games.

Why do we need extra Hz?

In old CRT TVs with a screen diagonal of more than 70 cm, at a standard frequency of 50-60 Hz, strong flickering was observed, which gave additional strain on the eyes.

The reason for this was not a low number of personnel, but a feature of the technology itself. Therefore, engineers have developed a CRT TV with a refresh rate of 100 Hz. With such a frequency, the picture did not blink, and the eyes did not get tired.

That is why there was a misconception that a TV with a high frequency value does not affect vision.

In an LCD TV with a frequency of 60 Hz, there is no flicker, and an increase in the frequency indicator is necessary for completely different purposes.

100,200,400,800 Hz technology

The main disadvantage of LCD TVs is a decrease in the resolution of the displayed frame in dynamic scenes.

Dynamic resolution is affected by the response of the sensor, caused by the slow switching of liquid crystals from the current color to completely black and back. An example of high-quality display of fast scenes in films is any plasma TV.

1.Application of LED illumination to increase dynamic resolution – scanning illumination. The easiest method. The effect on the clarity of the picture is noticeable, but at the same time the brightness value decreases and flickering is observed. The benefits of this feature are ambiguous. Used in budget TVs.

  1. Inserting additional frames. The technology requires a powerful processor and is used in mid-range models.

The impact on the picture in dynamic scenes is significant. There are a number of disadvantages:

– if this function is used when watching ordinary films, then the effect of the performance will appear:

– when creating additional frames, significant artifacts are observed in the form of incorrect frame overlap and afterimage.

  1. Combined method. The above technologies and various algorithms for processing, smoothing and eliminating image defects. The best solution. You can adjust the creation of additional frames and the degree of suppression of the blur effect in dynamics separately. Thus, to obtain high dynamic resolution in movies (24fps) without the effect of the spectacle.

The numerical value indicated in the characteristics is the image processing index, the sum of which includes the work of all TV technologies. Moreover, the efficiency of the index does not depend on the numerical value.

Output.

There is no need to chase the Hz value, this is a marketing ploy to sell a TV at a higher price. The quality of the picture depends on the set of technologies used to improve the picture. Frequency over 100 Hz makes sense to be in TVs with 3D image support, in other cases do not chase this value.

by Abdullah Sam
I’m a teacher, researcher and writer. I write about study subjects to improve the learning of college and university students. I write top Quality study notes Mostly, Tech, Games, Education, And Solutions/Tips and Tricks. I am a person who helps students to acquire knowledge, competence or virtue.

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