What is the TV’s refresh rate? Uses and popular TV scanning frequencies

The refresh rate of the TV will tell you about the image display speed of that TV within 1 second. So what kind of refresh rate do current TV models use? How many popular types are there? Let’s find out with Tnhelearning.edu.vn through the article below!

What is TV scan frequency? TV scan frequency unit

TV scan frequency (clear motion index) is the frequency that allows you to know the TV’s image display speed within 1 second.

The higher the scanning frequency , the smoother, sharper and more realistic the image display quality of movies and videos.

The unit of measurement of the scan frequency is Hz , how many Hz a TV screen will display in one second. Assuming a scan frequency of 60Hz, 60 images/second will appear, which is also one of the most popular numbers today and the lowest is 50Hz.

Types of common scan frequencies today

Actual scan frequency

The actual refresh rate can be understood as the total number of frames appearing on the screen that your eyes see in 1 second .

The more frames are displayed, the smoother and more realistic the motion quality will be.

Virtual sweep frequency

This is the level of scanning frequency that TV companies often announce, in fact, the virtual frequency level is many times higher than the real scanning frequency. Part of the reason is because of advertising and partly because this scan frequency is created by technology that helps to increase the total number of displayed frames in 1 second such as the scanning light system, inserting a black background frame, …

However, these technologies are the only way to make movies and videos smoother and smoother for the human eye, inherently the number of images of the true frequency applied by the TV remains constant.

In short, the actual scan frequency is the actual number of frames that appear in 1 second , and the virtual refresh rate is the scan frequency that has been increased thanks to the technologies that each TV company applies.

What is the difference between today’s TV scan frequency and before?

TV scan frequency today	TV scan frequency before
The current LCD TV line has a modern refresh rate with image display speed of about 120Hz to 140Hz .	Previous TVs only appeared at most 60 frames per second ( 60Hz ). As a result, the image quality is less smooth and sharper.

Methods of generating sweep frequency

Currently, there are two methods of generating scan frequencies that TV companies often apply: backlight scanning and black frame insertion / backlighting off (BFI).

• Backlight scanning method : The backlight system will gradually light up to divide the frame into many incomplete frames and then display them in turn instead of appearing only once. This method makes the viewer’s eyes feel much more comfortable thanks to the high speed and does not catch the constant flickering of the screen.
• Light/Backlight Frame Insertion (BFI) method : As the name suggests, absolute black backgrounds will be inserted between frames often causing the viewer’s brain to “trick” and feel the movements. smooth and clear. This method is considered to be simpler and more effective than scanning the backlight, but it will reduce the brightness of the screen quite a bit.

Many high-end televisions have applied both these and other methods to make the user experience as optimal as possible.

Scanning frequency parameters on current TV brands

Usually, each TV company will develop and apply different scanning frequencies with their own names with certain attributes.

• CMR (Clear Motion Rate) : Considered a clear motion resolution standard developed by Samsung TV, this technology includes an advanced backlight system (for high quality animation), Ultra Clear panel ( high contrast and fast image processing speed) to optimize image processing speed and display quality.

• MCI : Used for some LG TVs. This is a technology that improves image rendering speed, increases sharpness and reduces motion blur. This refresh rate is expressed in MCI units (equivalent to Hz).

• TruMotion : This is also the scanning frequency of LG TVs with 120Hz and 140Hz parameters, allowing to display high-class image quality, typically 4K HFR image scanning technology.

• Motionflow XR : This is Sony’s own scanning frequency, thanks to the integration of OptiContrast technology, this scan frequency helps the TV display images with fast and smooth quality – which can increase the number of images the viewer’s eye can see. 4 times, reduce glare (avoid causing eye pain).

• MEMC : Developed by TLC TV company, applying algorithms to reduce ghosting noise to increase frame stability.

The article has just brought you some of the most basic information about TV scan frequency, do you know any other interesting knowledge about TV scan frequency? Share with DienmayXANH.com in the comment section below!