Home » Electronics » 4K TVs With Fake 120Hz Refresh Rates Should Be Avoided

4K TVs With Fake 120Hz Refresh Rates Should Be Avoided

I’ll hold on for a minute. There is a possibility that you are not. Even though they claim to have “motion rates” and “effective refresh rates” of 120, 240, and higher, most TVs today operate at 60Hz. It is a long-standing practice for TV companies to hide the actual refresh rate from you. It is possible for 60Hz TVs to have slightly better motion performance than 60Hz TVs, but they lack the hardware of a true 120Hz TV, so they cannot create the same level of smoothness. The picture quality can be improved somewhat with a 120Hz refresh rate since motion blur is reduced. CNET reviews of 60Hz TVs like the TCL 6 series and Vizio M series still find them to have excellent image quality since most viewers don’t notice it.

True 120Hz TVs are more expensive to manufacture than budget or even midrange TVs, so you are unlikely to find them. Even higher-end TVs, like Samsung’s QLED TVs and Vizio’s P series, feature frames per second (FPS) above 120Hz for enhanced motion sensitivity. However, these numbers aren’t always fake guano. I’ll explain how it works.

What the hzeck is a Hz?

There is no motion in TV, just still images shown fast enough that your brain perceives that it is watching a moving image. These images, measured in hertz (Hz), show up at a steady speed. Televisions traditionally had a refresh rate of 60Hz to keep up with the electricity cyclicity. If you think of 60Hz as 60 video frames per second, then you will better understand this discussion. There are only a few TV shows that feature more than 60 frames per second. There is no difference in resolution between 1080i and 1080p. Now that we know how the stuff you watch matches, or is less than, the 60Hz of a normal TV, we can move on to the next part. The maximum frequency that you can get from your device is 60Hz, unless you have a computer or a game console. You can’t watch TV shows or movies in 120 frames per second. As of yet. Creating a 120Hz model is the process of converting an incoming signal to that frequency. Motion blur is reduced primarily for this reason. What is refresh rate? explains what it is and why it is important. There is a noticeable reduction in the apparent blurring of moving objects when you increase the number of frames (or use another method we’ll discuss below). This problem may not be apparent to you, but it is to many. LG’s version of OLED TVs have it as well. LCD TVs do not have it. LG uses terms such as TruMotion, MotionFlow, Motion Rate, Vizio uses Clear Action, while Sony uses Clear Motion Index, while Sony uses MotionFlow. These produce some suggestions about the TVs’ performance, but the actual refresh rate is not always advertised. There’s a problem here.

Black frame insertion

Black frame insertion (BFI) is one way in which manufacturers raise the refresh rate. A rapid turnoff of the LCD TV’s backlight occurs through this method. As for OLEDs, they are turned off. Thus, your eye/brain first sees the image, then nothing, then the image, then nothing, etc. There is no way of seeing this since it is done faster than you can blink. Though technically it is the same, more advanced versions could readjust the brightness so only a portion of the screen was in darkness at any given time. There is a great deal of value in BFI. There is a method of reducing motion blur without resorting to tricks such as the despised/loved Soap Opera Effect. If you have been to a movie theater that projects film (rare these days), you can see that these tricks are used. In a projector, you would put a shutter between the image on glass and the next film frame sliding into position so the image on screen would be blank when the next set of frames slid into place.

It is possible, however, that BFI has some negatives as well. might expect, adding black to an image makes it darker overall. Usually, those types of limitations don’t be a problem since super-bright TVs are so common these days. A flickering effect is of more concern. While this kind of behavior may not cause seizures (as many believe), it can be noticeable at best, and frustrating or tiring at worst. It depends on how the BFI is used, as well as the actual technology of the TV. The difference can be noticeable more on a TV set running 60Hz than a true 120Hz one. Nevertheless, it depends on how quickly someone sees flickers and the brightness of the room and TV in which they are watching. CNET’s TV reviews, for example, the reviewer David Katzmaier noticed flicker when he toggled the BFI mode on many TVs, so he avoided the modes and sacrificed motion resolution to obtain a brighter image with less flicker. Even though true 120Hz TVs likely have less flicker using BFI, they are probably still referred to as “240Hz” by the manufacturer. Neither is it, just as a 60Hz with BFI is not 120Hz. Since most people would be able to tolerate its flashing even higher than their flicker threshold, it could be less tiring to watch. The interface of Oculus and LCD TVs is blurry.

Processing tricks

It is also possible to increase the “motion rate,” or whatever the manufacturer is calling their inflated refresh rate, by incorporating any other processing which is happening concurrently. Instead of BFI, the TV could consider two video frames and create an entirely new frame to go between them. The answer is yes. There is little meaning in these numbers. Among Sony’s MotionFlow XR 1440’s features are 120Hz refresh rate and 2-year warranty. The reason I call them out is because it’s such a large number, but it’s important to note that on their TV’s tech specs page, the refresh rate is actually listed. The LG Super UHD TVs do the same. It is not a requirement for all manufacturers. In view of the fact that this processing needs a 120Hz TV (in order to insert the new frames between existing frames), it’s really a marketing issue, not a difference in the TV. As often as not, you can turn the Soap Opera Effect off if you don’t like it, or at least reduce it to a level that doesn’t bother you.

Careful shopping

Any TV specification should be read carefully by the buyer. In the event that a high-end TV has a popular feature, every company would like its budget TV to resemble it, no matter how they do it. you care about refresh rate, and if you dislike motion blur, do not take numbers at face value from companies. The “240” could mean one thing for one company but another for another company. Many companies will advertise their fabricated true motion/motion flow/motion Blah Blah numbers, but the actual refresh rate will always appear in the spec chart. Most of them only list their “fake” number, requiring you to read TV reviews in order to get a true idea of what’s happening. In their reviews, CNET lists the actual refresh rate, while calling out manufacturers who inflate their claims.