Banding easily appears during LightBoost mode in the full-screen TestUFO Flicker Test, which shows math rounding errors in Y-axis compensated RTC. Care must be taken to ensure that PWM-rate transitions doesn’t create flicker. External FPS Limiters, G-SYNC 101: Hidden Benefits of High Refresh Rate G-SYNC, G-SYNC 101: Optimal G-SYNC Settings & Conclusion, Preview of NVIDIA G-SYNC, Part #1 (Fluidity), Preview of NVIDIA G-SYNC, Part #2 (Input Lag), shorter strobe flahes results in less motion blur, released the gaming version of this monitor, Giant 120Hz + “LightBoost” on Optoma GT720 DLP Projector, EIZO announces Foris FG2421, a 240Hz VA gaming monitor! The Eizo “240Hz” monitor achieves 240Hz via a two-pass refresh. A 240Hz native refresh rate (flicker free, no strobing) which would have the equivalent motion blur of a strobe-backlight display utilizing approximately 4ms strobe flashes. These requirements shifts most of the complexity of adjustment/calibration fine-tuning to the end-user, or during later-stage in-house experimentation (e.g. High-frequency PWM and pwm-free dimming modes. There would still be lots of flicker, however, at these lower strobe rates, similar to a 60Hz or 72Hz CRT. (C) The further you move back the LED’s, diffusing becomes easier but you lose contrast ratio between ON segments and the OFF segments; the more leakage between segments. (2) You need a very long vertical blanking interval to wait for pixel transitions of the refresh to settle. Millisecond-scale and sub-millisecond-scale strobe lengths are more pratical, resembling short-persistence CRT phosphor). Other displays also use strobe backlights, such as NIVIDA’s ULMB, BenQ’s DyAc, or Sony’s low-lag Motionflow Impulse used in Game Mode. Be noted that not everyone like strobing (flicker) so the strobing mode should ideally be adjustable and easily disabled (to continuously shine the backlight, and return to regular sample-and-hold, with the motion blur disadvantage). Tests at HDGuru found that OLED motion blur can be as bad as a 60Hz LCD. aiming for >90% of people not seeing side effects from the variable-rate strobing). NVIDIA LightBoost, EIZO Turbo240) have been found to have less motion blur than current 2013-model OLED HDTV’s. The minimum possible consideration for the factory (and without needing the factory to understand motion blur reduction strobing fully) is that the display firmware simply needs to be able to turn ON/OFF the edgelight/backlight rapidly and precisely, and the firmware needs to know exactly when each refresh occurs. Finally, this annotated diagram helps people understand higher-quality strobe backlights: This is the modification of an existing computer monitor to add a strobe backlight (LightBoost style) for anyone with electronics knowledge, ability to use oscilloscope, ability to build a simple pulsed power supply. Then is the curve. Care must be taken to ensure that there is no noticeable side effects to white LED phosphor behavior, during on-the-fly strobe frequency changes. These simplified requirements below allows quicker and simpler firmware modifications, to support quality strobing. Here is simple, generic advice for the most inexpensive methods of adding a strobe backlight to a new computer monitor model, depending on the design of the existing LCD panel that you choose to implement in the design of a new computer monitor. Many artifacts start to appear due to more incomplete LCD pixel transitions between strobes, as you go higher in refresh rates. 2017 ADDED NOTE: See update at Blur Busters GSYNC+ULMB post. This is a useful technique to speed up pixel transitions on slower LCD panels such as IPS LCD’s and VA LCD’s, while fixing overdrive artifacts. The refresh pattern of an older 2007 LCD looks like the following: You will observe that there are some sequences in this video where three different LCD refreshes very obviously overlap each other. That said, many users are now clamoring to use LightBoost due to media coverage, and would like to keep low-persistence simultaneously with G-SYNC. I went ahead and ordered one. This is often beyond the scope of hobbyists, but if you are a small scale manufacturer (e.g. This covers information about scanning backlights. It is even possible to modify existing LightBoost monitors (so we can take advantage of the LCD’s existing response-time acceleration). This should produce excellent LightBoost -style quality, reasonable input lag, and excellent VA colors. bmg on HardForum made a successful modification to create a brighter LightBoost: I finally got around to opening up my VG248QE. (2) Not limited by backlight diffusion (A problem with scanning backlights). Flicker at any Hz with strobe of (1/X)sec, has equivalent motion blur to an “X” Hz display running at “X” frames per second. All of these monitors are sourced from LG and are certified by HDR600. This includes elimination of PWM (pulse-width modulation) for backlight dimming, and instead using DC voltage modulation for dimming the backlight. This is simply a camera that follows on-screen motion. The objective of response-time-acceleration algorithms optimized for strobe backlights (like the custom algorithm used for LightBoost) is to make sure the pixel is as close as possible to its accurate color value, at the exact moment of the strobe flash. This will be clearly noticed in certain motion tests such as www.testufo.com/blurtrail during strobe curve manipulation experiments. Why Use Motion Blur Reduction? Softer strobe curves may potentially reduce eyestrain, at the cost of adding back a slight amount of motion blur. And if a strobing feature can be added, 240Hz strobed would have far less flicker than either 60Hz or 120Hz strobed. For further discussions, or custom TestUFO motion tests, or contact mark@blurbusters.com. 3. An excellent animation of this modern LCD behavior is the TestUFO Checkerboard Illusion (view this on a recent 1ms or 2ms LCD, preferably manufactured after 2010, with very good response time acceleration). This is even despite the fact that many medium-persistence CRT phosphors (e.g. Erfarungen 144Hz/Backlight Strobing/Ghosting. special game displays), it is worthwhile to know that it is possible to do software based prototyping of response time acceleration algorithms using shader programming on a GPU. And you will get a LOT more flicker, because it’s 60Hz flicker, not 120Hz flicker. For that use case, avoiding visible flicker is more important. Lol I'm telling you no LCD has gotten backlight strobing correct except for maybe the Eizo FG2421. If I had to nitpick, the backlight strobing mode could be better, and we’re not quite hitting 100% sRGB coverage. The solution is strobed backlights / edgelights — that flash all at once. 1440p is quite demanding when it comes to the latest games. New TestUFO motion tests are being developed; if you require a specific specialized TestUFO motion tests, contact mark@blurbusters.com to send suggestions of additional motion tests and improvements that are needed. Der Monitor wird als 360 Hz beworben und enttäuscht bei Nutzung eben jener 360 Hz. If you keep the LED’s close to the LCD panel, you can get about 20:1 contrast between the off-segments and on-segments. In, For a homebrew hack, you may not get as good as LightBoost in motion clarity, especially if you mod an IPS computer monitor instead of a TN computer monitor. When refresh rates begin to enroach the pixel transition limitations of the LCD, the pixels at the bottom edge are far fresher than the pixels at the top edge, and thus begin to require different overdrive treatment to eliminate crosstalk (double-image effects) problems between refreshes. The sample-and-hold effect is enforcing motion blur; the shorter the persistence (flicker cycle, off-on-off), the less motion blur. OLEDs are very fast (e.g. Backlight strobing Emulated sRGB mode LFC support NVIDIA G-Sync Compatible Pixel-perfect upscaling Variable overdrive * * Die neuesten Vergleiche, darunter Eve Spectrum QHD 240Hz Die neuesten Vergleiche, darunter Eve Spectrum QHD 240Hz, die von den Website-Besuchern gemacht sind. It is roughly similiar to the difference between a medium-persistence CRT monitor and a longer-persistence CRT monitor. No. With 250 watts of LED’s, it only gets about double the brightness of a 25 watt edgelight already built into a typical modern panel. One of the techniques discussed, was the use of strobing to reduce persistence. This is not surprising, since modern LCD’s have majority (GtG 10%->90%) transition times of 1ms-2ms, a tiny fraction of a 60Hz refresh (16.7ms) and even 120Hz refresh (8.3ms), so GtG transition curves now mostly resemble square waves as GtG curves become de-facto cliffs to the human eye, and pixel ripples (overdrive) clears out more quickly, earlier during a refresh. The backlight strobing is actually above average(yes, you can strobe at 240hz). A stationary camera is good for photographing pixel transitions statically. Several recent strobe-backlight LCDs released in late 2013, have less motion blur when viewing real-world motion such as video games, panning scenery, and moving photo tests. Such older LCD’s are unsuitable for strobe backlight conversion, since such LCD’s are in a perpetual state of ghosting with no clear moments to strobe a backlight through. nVidia has licensed a strobe backlight technology called LightBoost to display manufacturers. For examples of pursuit camera photography done by Blur Busters, see: – LCD Motion Artifacts 101 – LCD Overdrive Artifacts – LightBoost 10% versus 50% versus 100%. AOC must be doing something fancy to make sure pixels disappear faster, such as backlight strobing. At the monitor’s maximum framerate, the strobing more resembles a square wave with large totally-black-gaps between strobes. With nVidia’s G-SYNC announcement, variable refresh rate displays are now a reality today. It also has a backlight strobing mode. A strobed backlight remains off for a MUCH longer time with PWM than without PWM, and on for a shorter time, and strobing is synched to the refresh rate itself. ULMB/LightBoost style backlight strobing). Similar to other BenQ ZOWIE monitors, the XL2546 borrows design elements from previous monitors. Tip for Experimenters: Turn ON/OFF the blur reduction mode while viewing TestUFO Moving Photo. This would make motion blur roughly equivalent to a LightBoost monitor running LightBoost=60%, The #1 Site of Everything Better Than 60Hz™, © 2020 Blur Busters | Theme by jor-folio.com, MSI Launches Monitor Console Mode with Selected Monitors, Two New Acer Gaming Monitors Emerge Across Markets, the XV282K KV and XZ270U P, JVC’s Enterprise XR Headset at Highest Per-Eye Resolution, The ASUS VG34VQL1B Ultrawide Gaming Monitor Set to Compete, Blur Busters Law: The Amazing Journey To Future 1000Hz Displays, GtG versus MPRT: Frequently Asked Questions About Pixel Response On Displays, The Basics of Network Lag – with Battle(non)sense, turns on the backlight only for the stable duration of the second image, Motion Blur Reduction (ULMB, LightBoost, etc), Reviewers using Blur Busters Testing Techniques, Strobe Crosstalk: Blur Reduction Double-Images, DIY Firmware Upgrade For BENQ Z-Series [2014], Strobe Utility for Calibration of BenQ/Zowie Blur Reduction, G-SYNC 101: G-SYNC vs. V-SYNC OFF w/FPS Limit, G-SYNC 101: G-SYNC vs. V-SYNC w/FPS Limit, G-SYNC 101: G-SYNC Fullscreen vs. Borderless/Windowed, G-SYNC 101: In-game vs. It is a far more complicated algorithm. This shows the GPU can be used to calculate the response-time acceleration compensated pixel values. This site uses Akismet to reduce spam. In addition, strobe backlight modes can simply be configured/disabled via monitor menus or graphics drivers, for those input-lag-critical situations or personal preference. Added two ASUS TUF gaming monitors with ELMB-Sync (simultaneous VRR and backlight strobing) and a 17″ 240Hz IPS portable monitor, the ASUS ROG Strix XG17. This can be an issue for some high-end competitive gamers. However, manufacturers need to consider this, especially at higher refresh rates. 2013 ADDED NOTE: This idea/research is being offered to any party for FOR FREE – Credit is only asked for (Name Mark Rejhon & website Blur Busters) for this idea, in someplace permanent, such as the references section of a subsequent patent application, or Credits section of a monitor manual, etc. Software-based response time acceleration prototyping: Some versions of the AMD Radeon drivers have had a GPU-based LCD Overdrive feature built in. To help speed transitions to blacks and to whites, you need overshoot room. Source Engine games such as Counterstrike and Team Fortress 2) for an excellent technical demonstration of the incredible flicker-free motion fluidity that 240fps@240Hz would give. High speed video is an excellent tool in gaining a better understanding of how modern LCD panels refreshes. LightBoost monitors use. The XL2546 is one of ZOWIE’s newer offerings, featuring a native 240hz panel along with their proprietary DyAc backlight strobing algorithm. I hadn’t popped open an LCD before, so I was a bit nervous, but it went fine. Alternative to PWM-free: For display electronics incapable of being PWM-free, the use of high-frequency PWM can be used as a substitute to PWM-free. This reduces eyestrain for motion-blur-sensitive people. Another need is to eliminate banding when using Y-axis compensated overdrive algorithms. Once pixel transitions completely fit within the “OFF” period, there’s no upper limit to motion clarity of LCD — motion is as clear as how briefly you flash the backlight. It is also possible that overdrive overshoots will gradually become more and more visible, as the strobing transitions to steady state (PWM-free) during a slowly falling framerate scenario. It is also noteworthy that there is also a market for 240Hz-native-refresh displays, for people who dislike flicker of all forms and prefer a 240Hz flicker-free display. For computer programmers with the Arduino 1.8.2 IDE, the backlight strobing microcontroller is fully programmable with custom 4-segment scanning backlight modes: Custom strobe pulse length (good for reducing motion blur, in a brightness versus blur trade-off) Custom strobe phase (good for adjusting position of strobe crosstalk) Overvoltage boost for brighter strobing at shorter … Also it will have zero latency option in the upcoming update. AOC Q27G2S. Unfortunately, going to a strobed approach results in several disadvantages: (1) You need far faster LCD’s than if you were using scanning backlights. If this is all it claims to be this isn’t just an extremely high refresh rate, but it should also have less blur than even competing 240Hz displays. Typical material includes panning, turning, scrolling, strafing in video games, that leads to panning motion similar to TestUFO Moving Photo Test. The motion clarity of an LCD is only limited by how briefly you are able to flash the strobe backlight. HDGuru, japanese scientists, etc) to fall greatly short of mainstream expectations, at least on large-screen format OLED displays. 240Hz means an average input lag of as little as 2.1ms (excluding pixel transition time), assuming 0ms for top edge of screen, through 1/240sec for bottom edge of screen for the LCD scanout. much like faint 3D crosstalk becomes hard to find). Fully certified and tuned by Blur Busters, PureXP blur reduction utilizes backlight strobing, drastically improving left to right motion image clarity for clear visuals in fast-moving objects. I’ve got plenty of room to increase the output if needed, but I like around 90cd/m^2. If you are experimenting with high refresh rate LCD’s (e.g. An engineer may ask; should we know when the future frame arrives before calculating strobe length (making frame buffering necessary; creating input lag)? That will make it more motion blur than LightBoost (which has motion as clear as a 700fps@700Hz display — visualize it like a 700Hz display with lots of black frame insertion, and only 120 visible frames lasting 1/700sec long eacah). TFTCentral also covered this in their Motion Blur Reduction Backlights article. 3 Comments for “ Eizo 240Hz VA monitor uses strobe backlight to strobing at higher refresh rates:,! Shorter than the 240Hz acer predator ( less than 1.4ms ) for best results minimize input lag, you! To flash the strobe flash length, as incomplete pixel transitions ) but this is a pixel-perfect upscaling in... Monitors are sourced from LG and are certified by HDR600 this general idea blending... 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