flicker free lcd monitors supplier

Please note:There has been a massive surge in the focus on ‘flicker-free’ monitors from many manufacturers since this list was first introduced on TFTCentral. As a result, the list is almost certainly not exhaustive. We will try to keep it updated for now, but at some point we will probably have to stop maintaining it. We will of course continue to mention whether upcoming models have a flicker-free backlight in our news pieces. We will also continue to test for this in our reviews.

For many people, finding a monitor without Pulse Width Modulation (PWM) backlight dimming is now a key consideration. We thought it would be useful to compile a resource confirming all the flicker-free monitors we have tested, along with any others which we know of from other sources. Below is a table we will keep as up to date as possible, although note that it may not be exhaustive. If you know of any other screens which are confirmed as flicker free, please email or tweet us the details and links to the tests and we will get them added.

Models confirmed as being flicker free, without the use of Pulse Width Modulation for backlight dimming are shown below, along with some reported to be PWM but as yet, not 100% confirmed by reliable sources:

Below are a list of models which are flicker free for part of their brightness adjustment range, but do use some form of PWM for other parts of the adjustment range.

Below are some additional monitors which may be flicker free. This includes monitors which some reviews have tested to be PWM free, while other reviews suggest otherwise.

There has been a massive surge in the focus on ‘flicker-free’ monitors from many manufacturers since this list was first introduced on TFTCentral. As a result, we have now retired this page. You should see flicker free listed against modern monitors in the manufacturer specs, and we will continue to test and validate those claims in any reviews we do. Other monitor websites now test for flickering and PWM as well.

The 20E1H offers a simple new solution for the mobile generation that delivers a hassle-free user experience. Work comfortably and efficiently with this compact 19.5" monitor, featuring a desk-friendly cable management design, VESA mount for operational flexibility, multiple connectivity options (e.g. HDMI and VGA), e-Saver low power configuration, and more. This display also comes with Low Blue Mode and Flicker Free eye protection to keep your eyes safe during those longer work sessions....

Designed for beautiful simplicity, BenQ GW2480 23.8 Inch frameless monitor combines ultra slim bezels with hidden cable management. Complementing BenQ exclusive Eye-Care Technology with Low Blue Light Technology and Flicker-Free performance for extended viewing comfort, industry-leading Brightness Intelligence Technology delivers exquisite details in any ambient lighting environment. With the ideal combination of LED and IPS technologies, GW2480 delivers a new level of visual enjoyment with truly authentic colors, deeper blacks, higher contrast, and sharper details.

Explore your options from a wide selection of LCD and LED monitors. They come in an array of sizes and with different features. Choosing the right monitor will depend on your needs. Ultra-wide business computer monitors boast generous displays that allow for productive split-screen setups. In contrast, gaming monitors offer faster refresh rates and high-resolution drivers that deliver vivid HD images for a captivating gaming experience. Some monitors provide work-friendly features, like blue-light filtering and anti-glare treatment, making them a suitable pick for the office. Many modern monitors offer built-in speakers and strategically placed USB ports for charging smart mobile devices. Other factors to consider when choosing a computer monitor include the screen size, resolution and ergonomic flexibility.

Most modern flat panel monitors offer sleeker designs that make them easier to fit in almost any workspace. Some models even have innovative cable management to help ensure your workspace is clutter-free for optimal productivity. They also provide energy-saving features, so you spend less on your power bill. Widescreen business computer monitors often boast strategically placed controls that allow for easy manipulation. They also offer lighting modes structured to reduce eyestrain during extended use, making them suitable for multi-tasking professionals. Some Full HD LED monitors come with multiple connectivity options, giving you a lot more flexibility.

If you’re a professional content creator in the digital arts, opt for LCD and LED monitors with higher pixel densities that deliver clear, lifelike images. Some monitors feature slim and trendy designs, making them an aesthetic addition to your workstation. Profession monitors feature HDMI™ 2.0 ports, allowing for more consistent multimedia output. Capable of decoding HDR™ video, these computer monitors support fast and detailed video playback. Some feature sleek, frameless designs with screen panels that offer near-seamless wide-angle viewing. Touch screen monitors help improve productivity by providing a convenient alternative to clicking or scrolling with a mouse or trackpad. Many LCD and LED monitors feature built-in speakers, reducing the cost of procuring external speakers.

Gaming monitors are a vital component of any serious gaming set up. The larger models may offer a wide aspect ratio that allows for viewing high-definition media. Some come with functionalities to deliver crisp and bright images with vibrant colors. Gaming LCD and LED monitors may also feature adaptive synchronization technology designed to reduce input latency for smoother gameplay. Often, gaming monitors  offer connectivity to various sources, and feature Picture-In-Picture (PIP) functionalities, enabling convenient multitasking. Most full HD LED monitors feature fast pixel response and refresh rates that reduce motion blur and image lag. Some HD models boast curved screens for an optimal gaming experience, while others offer even sharper 4K resolutions. They also feature USB 3.0 ports for connection to other monitor accessories.

Backlight strobing, commonly known as black frame insertion (BFI), is an effect where the backlight flickers itself to try and improve the appearance of motion. We check for this in a separate test, but the BFI feature is tied into the flicker frequency; the only difference is that the image flicker is during regular use, while the BFI feature is usually something you can turn on and off. Below you can see an example of how introducing flicker on the LG 29UM69G-B helps improve the appearance of motion. However, there are times that the BFI features isn"t good and creates more image duplication, as you can see here.

Manufacturers implement different techniques of pulse width modulation, but one of the more common techniques is shortening the duty cycle. The duty cycle refers to the amount of time the pulse is sent for, and shortening the duty cycle reduces the intensity. Below are two examples from TVs that use different types of PWM, but the same techniques are applied with monitors that use PWM. You can see with the LG that the backlight flickers at all brightness levels, and the difference between the 100%, 50%, and 0% luminosity is the duty cycle. The backlight stays on for less time as you decrease the brightness. The Vizio starts to flicker at lower brightness levels with a short duty cycle, and by the time it reaches 0%, the cycle is almost 0.

A monitor can introduce image flicker at lower backlight levels, even if it"s flicker-free at its max brightness. If you"re concerned that your monitor flickers at lower backlight levels, set the brightness setting to its lowest, and wave your hand (or any object) in front of the screen. If you notice your hand is moving like it"s in front of a strobe light, then it has flicker. Increase the backlight until you don"t see this. If you don"t see this effect, then there"s no flicker.

We test the flicker on TVs similar to monitors, but on TVs, we also check to see which backlight setting the flicker starts at. We don"t do that for monitors. You can use the test above to see when the flicker starts exactly.

This test is meant for LED-backlit displays and not OLEDs because they don"t have a backlight. Still, OLED monitors get a perfect 10 because they don"t have any flicker.

LED-backlit monitors have a backlight to display an image on the screen. Sometimes, these monitors will use a technique called pulse width modulation in order to dim the backlight, where it sends short impulses, creating a flicker effect. We want to know which monitors do this and at which frequencies the backlight flickers. Most monitors we"ve tested are completely flicker-free, but there are a few that flicker. Introducing flicker can help with the appearance of motion but may also create eye strain, so having a monitor that flickers or not is entirely up to you.

In our connected world, more of us are spending time in front of screens than ever before. While most people know that spending hours in front of a monitor can impact their eyes and lead to developing headaches, not everyone is familiar with flicker-free monitor technology. They’re also not aware of monitors with warranties for productivity, such as the Pixio FreeSync certified productivity warranty our review discusses. Understanding just how monitors can contribute to eye strain and other health concerns will help you make a more informed decision the next time you shop for a great monitor.

Officially known as pulse-width modulation (PMW), screen flickering occurs when a monitor rapidly turns the backlight on and off. Although flickering isn’t detectable to the human eye, it can lead to eye strain and cause headaches in some people.

Moreover, it doesn’t allow for seamless gameplay as FreeSync does. If you want to know what is FreeSync and how it works, check out our resources articles.

Even though you’re not actively aware of the flickering, that doesn’t mean that your body isn’t responding to it. Specifically, your pupils are tracking the flickering. As a result, they contract and dilate to adjust to the change in brightness.

As a result, over time you’ll experience eye strain or even eye fatigue and is sometimes commonly known as computer vision syndrome. In some cases, this discomfort can occur in just three to four hours of using a monitor that lacks flicker-free technology. In severe cases, excessive exposure to flickering screens can encourage age-related macular degeneration or even vision loss.

Warning: this discomfort can occur in just three to four hours of using a monitor that lacks flicker-free technology. In severe cases, excessive exposure to flickering screens can encourage age-related macular degeneration or even vision loss

Most modern monitors on the market today are designed to be flicker-free. This means that these monitors rely on direct current (DC) modulation to manage screen brightness. As compared to older monitors, these models don’t turn the backlight on and off rapidly. Instead, they use a contrast light stream regardless of the brightness level.

While flicker-free monitors are the norm rather than a luxury upgrade these days, some manufacturers still rely on PMW yet market their monitors as flicker-free. While this typically won’t bother individuals who prefer a brighter screen, the issue comes into place for people who prefer to work with a lower brightness setting. Often, PWM is triggered when the brightness setting is below 50% with the most common trigger range being between 20 to 30%.

Thankfully, you don’t need expensive equipment to determine if your computer monitor is truly flicker-free. All you need is a smartphone with a working camera. To perform the test, set the computer brightness display to the peak setting. Next, turn on your smartphone’s camera and aim it at the computer screen.

Studies reveal that after only 3 to 4 hours of use of a traditional computer monitor one that’s not engineered with flicker-free technology – 90% of computer users may experience eye fatigue. (viewsonic.com)

All screens flicker to some degree — be they TV screens, car navigation displays, monitors, tablets, and yes, even smartphone displays. In this article, we will talk a little about what flicker is, what can cause it (on smartphones in particular), and how we at DXOMARK test for it, quantify it, and measure its impact on the end-user experience.

Flicker is a quick oscillation of light output between on and off; it is measured in hertz (Hz) to quantify the frequency at which the oscillation occurs. While we may not be consciously aware of the flicker phenomenon, it’s important to understand that our eyes still physically respond to it — that is, our irises expand and contract in response to these changes in brightness. This involuntary physiological response can certainly explain why we may have a headache and particularly why our eyes can feel tired after looking at a display for an extended period of time — they have been working hard! (This is especially true when looking at a display in dark ambient conditions, such as reading in bed with the lights turned off, for reasons we’ll touch on a bit more below.)

Given the ubiquity of smartphones, it is unfortunate that the flicker on their displays (especially OLED displays) is still an issue for many people. But wait! Why do they flicker? Well, let’s remember that smartphone display hardware is based on either LCD (liquid crystal display) or OLED (organic light-emitting diode) technology. LCDs don’t emit their own light; rather, they are back-illuminated by a strip of LEDs whose light intensity is quite powerful so as to compensate for the brightness drop due to the low transmission rate of the LCD panel (caused mainly by the RGB color filter). By contrast, in an OLED display, every pixel is itself an OLED that produces its own light.

Since both LCDs and OLED smartphone displays are composed of light-emitting diodes, let’s describe how these diodes are driven. Because of a diode’s intrinsic physical properties, it cannot be dimmed by changing the intensity of the current (mA) without impacting the color of the light. So how do phone manufacturers dim displays? They make use of a technique called pulse-width modulation (PWM), which means that they turn the diodes off and on at varying rates. Because we normally should not be able to see this switching between off and on (in other words, the flicker!), our brains are fooled into perceiving the screen as simply dimmer overall (a phenomenon known as the “brain averaging effect”). How dim depends on how long the diodes are off versus how long they are on: the longer they’re off, the dimmer the screen will appear.

So both LCDs and OLED displays power their light sources differently, but both technologies are subject to flicker effect; however, it is usually more noticeable on OLED displays than on LCDs. For one thing, OLED displays and LCDs show PWM at different frequency ranges — the PWM of OLED displays range from ~50 to ~500 Hz, whereas the PWM of LCDs starts at around 1000 Hz or higher. Second, as the human eye may experience flicker sensitivity up to about 250 Hz (at least for most people), it should come as no surprise that OLED displays are more likely to cause eyestrain than LCDs.

A significant disadvantage to using PWM technology can be that when a display adjusts to its minimum brightness in very dim or completely dark ambient light conditions, the duty cycle is very short and the interval when the diode is off is proportionately much longer (for example, minimum brightness may translate to a 10% duty cycle, meaning that the diode is off for 90% of the period). At lower PWM frequencies, flicker can become much more noticeable, which helps explain why reading text or watching videos in bed at night is more likely to cause headaches and eyestrain than when viewing screens in brighter conditions.

So how does DXOMARK measure flicker? One major way is with a device called, appropriately enough, a flickermeter (specifically, a TRD-200 from Westar Display Technologies), whose sole purpose is to measure quick oscillations in brightness. Our engineers follow a strict protocol for measuring flicker on each smartphone display: all devices are individually tested using their default settings under the exact same dark (< 0.1 lux) ambient lighting conditions, and are placed at the same distance from the flickermeter. We chart the output on this graph (which we use to compare up to four phones in our display reviews; note that you can click on the name of a phone in the legend on the bottom of the graph to remove or redraw its results):

Yes, it’s a cool-looking graph, but what does it mean? How should we read this? Well, first of all, keep in mind that these results correlate with each device’s PWM — the on/off power cycle that helps control screen brightness. The horizontal X axis show the frequency of the oscillations over time measured with the flickermeter in hertz (Hz). The vertical Y axis shows the SPD(dB)— spectral power density in decibels, which is the amount of power associated with one frequency of the signal that the display generates.

The first spike in our flicker graph appears at a phone’s listed refresh rate, but it is the highest spike — that is, the one that comes closest to or surpasses 0 dB — that is of interest to us in terms of flicker, as it indicates the PWM frequency; in this case, 241 Hz for the Samsung (S20), 362 Hz for the Huawei, 481 Hz for the OnePlus, and 240 Hz for the other Samsung (Note20). (Just in passing, you can nearly always ignore values below -40 (dB) on the graph, as they correspond to testing noise.)

The very slow-motion video below imitates the results of a flickermeter test. What is interesting to note is that from left to right, the devices scroll faster, which indicates different PWM frequencies.

In this second very slow-motion video, we included the Samsung Galaxy Note20 Ultra 5G that has a refresh rate of 120 Hz; interestingly enough, however, its PWM frequency is 240 Hz (as the flicker graph above also showed). In the video of the Note20 Ultra 5G, you can see that it has one frame on (bright) to five frames off (dark); the P40 Pro ends up with one frame on to three frames off; and the Find X2 Pro varies between one frame on to two or three frames off. All this is to say that where flicker is concerned, even a phone with a fast refresh rate like the Samsung Galaxy Note20 Ultra 5G can have a low PWM frequency and thus noticeable flicker under certain conditions. If you are sensitive to flicker, you will likely notice it on the Samsung devices at this brightness level and these PWM frequencies, but not on other devices with higher PWM frequencies.

You will no doubt notice the striking difference between the two Oppo Find X2 Pro devices on the right in the video above. While the Oppo device already benefits from a fast PWM rate, the shot of it on the far right shows the very noticeable effect of the Find X2 Pro’s flicker reduction feature (something we do not test in our current protocol, but that our technical team felt was worth pointing out).

Keep in mind that our engineers base their evaluations and the scores they assign to smartphone displays not only on the objective tests they perform with flickermeters and other instruments, but also on perceptual tests that they conduct after being specially trained to see flicker.

To further illustrate flicker, our engineers used a DSLR mounted on a translation rail and moved it quickly while it took a slow (1/10 second) shot of the three mounted smartphone displays shown below to imitate the effects of PWM. In the image of the Samsung Galaxy Note20 Ultra 5G on the left, you can see each individual white dot; on the Huawei P40 Pro in the middle, the individual dots are much closer together, but are still largely discernible; in the image of the OnePlus 8 Pro, however, the dots look more like an almost continuous line. Unsurprisingly, flicker is stronger on the devices where the white dots are further from one another — that is, devices with a lower PWM frequency.

Let’s wrap things up by first repeating that flicker on smartphones is caused by the use of pulse-width modulation that turns light-emitting diodes off and on to control screen brightness levels. As we normally perceive flicker via our peripheral vision rather than via our “attending vision” (that is, what we specifically focus our eyes on), the small size of a smartphone screen makes it less likely that we will see flicker on it (unless we hold the phone very close to our eyes) than we might when viewing content on a laptop screen or monitor. When we do see flicker, however, it’s the PWM that is the culprit; and while flicker can be reduced on a phone with a higher refresh rate, you may sometimes see flicker on it anyway if the phone’s PWM is slow (as we saw with the Samsung Galaxy Note20 Ultra 5G).

Finally, it’s also important to remember that some people are more sensitive to noticing flicker than others; in fact, even people who may not consciously perceive flicker may nonetheless be sensitive to it, winding up with headaches or eyestrain after overdoing their screen time. Such people could choose an OLED smartphone with an anti-flicker feature, or one with an LCD. As you can see in the table below, the last entry shows the data for the Xiaomi Mi 10T Pro; since it uses LCD technology, its PWM frequency is so high that it in essence eliminates the flicker issue.

This all said, you can rest assured that if our testers do discover a smartphone that has noticeable problems with flicker at its default settings, we will let you know about it as part of its Display review. (And by the way, we’ll also mention if a smartphone comes with a “flicker-free” feature or setting.)

We’ve raised the bar by incorporating some of our proprietary technologies into the ASUS VP228HE to give you a truly vivid visual experience. The VP228HE features the new SplendidPlus™ Video Intelligence Technology that optimizes videos and images by enhancing color brightness, contrast, and sharpness. SplendidPlus™ features two new modes – Reading and Darkroom – in addition to the Scenery, Standard, Theater, sRGB, and Night View modes. Low-blue Light and Flicker-free technologies also reduce the strain on your eyes after long periods of use.

The TÜV Rheinland-certified ASUS Blue Light Filter protects you from harmful blue light, and you can easily access its four different filter settings via a hotkey. VP228HE has undergone stringent performance tests and has been certified by TÜV Rheinland laboratories, a global provider of technical, safety, and certification services, to be flicker-free and to emit low blue light levels

It"s time to say goodbye to those tired, strained eyes. VP228HE features TÜV Rheinland-certified ASUS Flicker-Free technology to reduce flicker for a comfortable viewing experience. This technology helps minimize instances of eyestrain and other damaging ailments, especially when you spend long, countless hours in front of a display watching favorite videos.

Adaptive-Sync/FreeSync™ technology to eliminate screen tearing and choppy frame rates to give you seamless visuals and smooth gameplay. This gives you the upper hand in first person shooters, racing, real-time strategy and sports titles. (Adaptive-Sync/FreeSync™ works at fresh rates ranging from 48Hz to 75Hz)

We’ve raised the bar by incorporating some of our proprietary technologies to give you a truly vivid visual experience. Splendid Video Intelligence Technology that optimizes videos and images by enhancing color brightness, contrast, and sharpness. Splendid features two new modes – Reading and Darkroom – in addition to the Scenery, Standard, Theater, sRGB, and Night View modes. Low-blue Light and Flicker-free technologies also reduce the strain on your eyes after long periods of use.

The TÜV Rheinland-certified ASUS Blue Light Filter protects you from harmful blue light, and you can easily access its four different filter settings via a hotkey. ASUS displays has undergone stringent performance tests and has been certified by TÜV Rheinland laboratories, a global provider of technical, safety, and certification services, to be flicker-free and to emit low blue light levels

It"s time to say goodbye to those tired, strained eyes. ASUS displays features TÜV Rheinland-certified ASUS Flicker-Free technology to reduce flicker for a comfortable viewing experience. This technology helps minimize instances of eyestrain and other damaging ailments, especially when you spend long, countless hours in front of a display watching favorite videos.

Screen flickering in Windows 11 is usually caused by a display driver issue or incompatible app. To determine whether a display driver or app is causing the problem, check to see if Task Manager flickers. Then, based on that information, you"ll need to update, rollback, or uninstall your display driver or update or uninstall the app.

If Task Manager flickers along with everything else on the screen, a display driver is probably causing the problem. In this scenario, see the Fix your display driver section.

If Task Manager doesn"t flicker while the rest of the screen is flickering, an incompatible app is probably causing the problem. In this scenario, see the Update or uninstall an incompatible app section.

If Windows Update recently made updates to your device, roll back your display driver. Otherwise, try updating or uninstalling your display driver to fix the flickering or scrambling problem.

After you uninstall the first app, restart your device and check if the screen flickering or scrambled issue is resolved or not. If it"s not, uninstall each app one by one until the issue is resolved.

This page describes how the LCD settling behavior is specified and measured. Regarding the set of performance measures, we distinguish between two LCD operating modes: Strobed backlight (LightBoost and similar) and flicker-free backlight. This page is only about the settling performance in the flicker-free backlight mode – for the settling performance in the LightBoost mode see LightBoost settling.

Side note: Both modes, flicker-free and strobed backlight, can be equally useful, but it all depends on the application. Strobed backlight is certainly useful when it comes to presenting motion stimuli and avoiding motion blur, no matter whether the stimuli are possibly tracked with the eyes. Strobed backlight also offers a basically instant and fully synchronous stimulus onset and offset, which comes, of course, with flicker that is usually not meant to be part of the stimulation. Synchronous stimulus onset means that the stimulus appears at all screen locations at the same time (sufficient settling performance assumed).

Flicker-free backlight, on the other hand, is useful for static stimuli or for stimuli which are animated in place, meaning for stimuli which do not move but are possibly switched on and off at fixed locations. The stimulus onset and offset is not as instant as with strobed backlight, and the screen is not updated all at once but, instead, from top to bottom. However, there is no flicker unless flicker is intended to be part of the stimulus.

Actually, both backlight modes have aspects that are similar to the operation mode of the good old CRTs. The pulse-like excitation of the phosphors is more similar to the strobed backlight mode, whereas the line-wise screen refresh is more similar to the flicker-free backlight mode.

The goal behind representing the settling behavior by a few graphs and numbers is to quantitatively rate the performance of a monitor and to compare it with other monitors or the requirements of the application at hand. It is difficult, however, to come up with a set of performance measures that is small, easy to understand, easy to measure, and of practical relevance. What is practically relevant depends, of course, on the application at hand and on the properties the monitors actually can differ in. Regarding the latter, an overshoot measure, for example, does only make sense if the monitors actually differ in overshoot behavior, which they only do since overdrive technologies have been implemented. So to some extent, the set of performance measures needs to be adapted to the ever changing monitor technology. Using an inappropriate set of performance measures is not only misleading us, the customers, when looking for a good monitor but might also make manufacturers optimize monitors in the wrong way.

All analysis was done for a low-pass filtered luminance signal, using a Gaussian low-pass with a -3dB corner frequency of 70Hz. 70Hz is assumed to be close but still safely above the critical flicker fusion frequency (CFF). It is worth mentioning that the CFF is not a hard limit beyond which humans cannot detect flicker anymore. Likewise, the corner frequency of a Gaussian low-pass filter is not a hard limit beyond which no energy can pass the filter anymore. Anyway, applying such a low-pass filter makes the analyzed signal look more like it is "seen" by the visual system. Moreover, low-pass filtering increases the S/N ratio, thereby making analysis easier and more robust. On the other hand, such low-pass filtering might be the limiting factor when it comes to measuring very small rise/fall times. For example, filtering an ideal step function signal with a 70Hz Gaussian low-pass filter would result in an apparent rise time of about 4.8ms.

Note that the errors for the first refresh cycle are not that relevant in the flicker-free mode as they might just reflect the choice of the frame binning in conjunction with the form of the onset/offset luminance curves. More important might be the error distribution, which goes hand in hand with the delay deviation. Small delay deviations should result in a rather uniform error distribution for the first refresh cycle, which is a good thing then, irrespective of the absolute error level.

Unfortunately, the LCD settling behavior depends quite a lot on the monitor settings, and it is impractical to measure and report the results for all the possible setting combinations. The monitor"s factory settings should give a good starting point though, assuming that these are the settings the monitor has been optimized for. However, if the factory settings are too far off from any reasonable monitor calibration, more realistic settings should be used. One particular problem arises when colored scenes and color calibration comes into play. This is because the gains for the color channels (Red, Green, and Blue), along with the Contrast setting, define the maximal nominal range of operation, i.e., the maximal luminance per primary color. If these settings are not maxed out, the remaining range can be used internally by the monitor for overdrive. But even if overdrive is not active, the settling behavior of the LC cells still depends on the chosen operating range.

However, setting the Brightness to 100% usually makes even monitors with PWM backlight flicker-free, which is a necessity for running the measurement procedure successfully. Moreover, a higher brightness also results in a better S/N ratio for the photodiode measurements.

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