And so on. This is the, far by the easiest homebrew hack to create a home-made LightBoost-like strobe backlight. ULMB/LightBoost style backlight strobing). Strobing Refresh Rates (Hz) 120, 144, 240, 280. With a blazing fast 240Hz … An European researcher, Marc Repnow, reverse-engineered LightBoost strobe control electronics (for scientific use) and found some key electrical contacts which make it possible to brighten/shorten the LightBoost pulses to reduce motion blur even further (better than LightBoost=10%). 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. There are also several other TestUFO tests, selectable at the top of www.testufo.com. Though I’d like to know if there is a perceptible difference between a regular 120hz IPS and this one to justify the (5-fold? That said, prototyping an algorithm on a GPU can be a good source of experimentation before creating firmware that gets permanently installed on a computer monitor. As a rule of thumb, there should ideally be an easy ON/OFF setting for the motion blur reduction backlight. High-quality shutter-glasses 3D panels already have built-in custom response time acceleration out of necessity, so verify that a wheel is not being reinvented before embarking in the difficult art of programming custom response time acceleration for an LCD panel. (Presumably, G-SYNC’s optional strobe mode, has probably worked to reduce these banding issues). In addition, if your project has benefited from the information on this page, please let us know! 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. That depends on the strobe length, one backlight flash per unique refresh/frame. Frame grab from high speed video, of an LCD unsuitable for strobe backlight. An interesting question is the strobe flash length, as shorter strobe flahes results in less motion blur. CRT phosphors can ‘flicker’ at ~5000cd to compensate for the dark period between refreshes, so we’re getting “there”). Pulse Width Adjustment. This is a useful consideration for a theoretical 240Hz LCD gaming monitor. 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. Example: Stationary camera photo of a moving object on a display. Mathematically, a 60Hz display flickering at 1/120sec flash per refresh, has the same amount of motion blur as a 120Hz sample-and-hold display, for motion of framerate matching Hz. The display itself rests on a metal stand that’s connected to sturdy plastic base, which includes a groove to place ZOWIE’s proprietary S-Switch … If anyone else already came up with this idea, or already documented in a patent application prior to October 19, 2013, please let me know & due credit will be given here. That’s about all we can think of. 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. This is the best 1st generation panel because backlight strobing mitigates the 1st generation weaker response time compliance for 240hz refresh rates* (4.17ms). (e.g. However, the shape of the strobe curve will generally not matter in real-world gaming during short strobe lengths (square-wave strobing versus gaussian-wave strobing). It is also worth noting that many LightBoost monitors are now only $250 each; so one could even instead hack an existing LightBoost monitor to add the following features: 1. For example, refreshing the LCD panel two times on the same image (one refresh from computer converted into two duplicate panel refreshes), before strobe-flashing during the clean period at the end of the second-pass refresh. Some side effects you may notice: 1. Eve Spectrum QHD 240Hz. It is observed that dynamic changes to the strobe shape (as long as the strobe is small) doesn’t create very noticeable or objectionable visual effects. This page tells hobbyists, electronics tinkerers, and small manufacturers how to get started in creating strobe backlights, and experimenting with them. This site uses Akismet to reduce spam. 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. I tried it and i didn't see much difference, except the screen got dimmer. The higher the refresh rate the better. Another potential advantage of a multipass refresh is that LCD inversion artifacts can be engineered to become less visible during a single refresh (for those particular panels that use voltage inversion during every other refresh). For motion blur measurements, it is very important to observe the distinction between stationary camera versus pursuit camera. Der Monitor wird als 360 Hz beworben und enttäuscht bei Nutzung eben jener 360 Hz. 240 Hz mit Backlight Strobing sieht sehr gut aus, aber dafür zahlt man keine 800€ heutzutage. So one will want blacks that is slightly higher than full-black, and whites slightly lower than full-whites, to give extra headroom for response time acceleration. It should give you the best experience possible, without dominating your desktop. If you do get a high speed camera, a good test pattern for high speed camera use, is Blur Busters Motion Test (Flicker) which can help you determine how they refresh, and to help you with timing the strobe backlight flashes. The first refresh pass can be a very heavily-overdriven refresh pass done in total darkness, and the second refresh pass can be a clean-up refresh pass to stabilize the LCD pixels (eliminate overdrive artifacts), before strobing the backlight after the refresh is cleaned-up of overdrive artifacts. This is a useful consideration for a theoretical 240Hz LCD gaming monitor. 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. One of the techniques discussed, was the use of strobing to reduce persistence. A disadvantage of 60Hz is more flicker than LightBoost. This will be reduced with a higher refresh rate, but can worsen ghosting. The driver/power supply board is slightly different than the XL2411T, but very very close. eliminate the need for custom overdrive algorithms at lower refresh rates, eliminate the need to use a large blanking interval). And you will get a LOT more flicker, because it’s 60Hz flicker, not 120Hz flicker. ……..Either in the original signal, killing your bandwidth; ……..OR artifically lengthened interval via partial display buffering and then accelerated scanout refresh — like LightBoost does). Why Use Motion Blur Reduction? 6, 8, or 10 bit per component input (RGB 4:4:4) Edid management and redetection through user buttons. Most of these media articles cite Blur Busters as the Internet’s #1 source of LightBoost motion blur elimination information. We’d also expect HDMI 2.1 for future proofing and a better backlight strobing mode. A 120Hz display can refresh twice as fast as a 60Hz display, allowing it to display up to 120fps, and a 240Hz display will handle up to 240fps. An idea that Mark Rejhon of Blur Busters has come up with is a new creative PWM-free-to-strobing dynamic backlight curve manipulation algorithm, that allows variable-rate backlight strobing (LightBoost), without creating flicker at lower frame rates. Many of our readers crave perfect motion clarity. A high speed camera is not absolutely required, but it will be very helpful in determining how long a blanking interval you need between refreshes, in order to completely hide pixel transitions. Although flicker can create eyestrain into itself, another cause of eyestrain during PWM is the appearance of ugly PWM motion artifacts: Appearance of www.testufo.com/ghosting using PWM dimming at lower Brightness settings. IPS glow is minimal. 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. Mark Rejhon has invented a solution: Dynamic shaping of the strobe curve from PWM-free mode at low framerates, all the way to square-wave strobing at high framerates. Higher refresh rates require extremely powerful GPU’s, though 240fps is easily achieved on modern GPU’s in older games (e.g. (Default setting: On). (2) Scanning backlights are WAY more inefficient in eliminating motion blur than strobe backlights. This is due to the difference between stationary viewing (stationary camera/stationary eye) versus tracking motion (pursuit camera/tracking eyes). This is because pixel transitions are now much shorter than the refresh length. Similar to other BenQ ZOWIE monitors, the XL2546 borrows design elements from previous monitors. (2) You need a very long vertical blanking interval to wait for pixel transitions of the refresh to settle. 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 multipass refresh technique is being done on certain LCD’s. Your monitor should be as inspiring as your adventures. Some 1000fps capable cameras can be found for as little as $200! An engineer may ask; should we know when the future frame arrives before calculating strobe length (making frame buffering necessary; creating input lag)? Observe the differences in motion blur in the windows of the castle at the top of the moving photo. 2017 ADDED NOTE: See update at Blur Busters GSYNC+ULMB post. The trigger framerates may be different from the examples (or may even be adjustable via a user flicker-threshold setting), but the concept is the same. Ideally, the strobe backlight operate at any refresh rate, even all the way down to 60Hz (for emulator and console use), while allowing strobing at higher refresh rates (to reduce flicker). Although custom strobe-optimized response time acceleration algorithms would be ideal, a multipass refresh may simplify strobe backlights for homebrew situations (e.g. But the manual suggests that the strobe only occurs at the clean period of the second refresh, which suggests the strobe is shorter than 1/240sec. It is obvious to a scientist/engineer/vision researcher that to maintain constant perceived brightness during variable-rate strobing, you must keep strobing duty cycle percentages constant when varying the strobe rate. At this time, these motion tests run with full VSYNC ON fluidity in Google Chrome browser on a GPU-accelerated system during full screen mode (F11). Learn how your comment data is processed. In motion tests on a LightBoost monitor (with LightBoost activated), when using the monitor OSD menu to quickly alternate between LightBoost=0% (use monitor OSD, set LightBoost to one setting below 10%, which uses a longer but dimmer strobe) and LightBoost=10% (shorter but brighter strobe) while viewing motion tests at TestUFO. Monitor manufacturers (monitor firmware engineers) have to work to minimize input lag as much as possible during strobe backlight operation, using techniques such as: One method of cleaning up LCD refreshes to make them strobe-friendly, is a multipass refresh. 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. Published Jul 14, 2013 by Chief Blur Buster in: Area 51: Display Research Homebrew. This leads to situations where strobe-backlight video gaming LCD monitors, have less perceived motion blur during typical material than on current 2013-model OLED HDTVs. Such older LCD’s should be avoided for strobe backlight conversion projects. This is conceptually similar to a strobing backlight. As seen by LightBoost enthusiasts (just google “LightBoost”) and the existence of ToastyX Strobelight, the high-end monitor community is full of fans, geeks, programmers, designers that are interested in this type of tweaking. The Eizo “240Hz” monitor achieves 240Hz via a two-pass refresh. Example: 10fps@10Hz — PWM-free backlight 30fps@30Hz — PWM-free backlight 45fps@45Hz — PWM-free backlight 60fps@60fps — Minor backlight brightness undulations (bright / dim / bright / dim) 80fps@80Hz — Sharper backlight brightness undulations (very bright / very dim) 100fps@100Hz — Starts to resemble rounded-square-wave (fullbright / fulloff) 120fps@120Hz and up — Nearly square-wave strobing like original LightBoost. people who never eyestrain with CRT but now get eyestrain with PWM even in situations where excessive blue light from common white LED’s is eliminated). In fact, you can bypass phosphor completely using RGB LED’s, and achieve an MPRT of less than a microsecond on an LCD via the strobe backlight technique (This is likely far shorter than necessary for maximum motion clarity to human eyes. Although there are points of diminishing returns, they do not stop for a long time — there is definitely a benefit to “1000fps@1000Hz”, and it also becomes even more important for virtual reality (see Michael Abrash’s writings, of Valve Software), but quite noticeable for many motion blur sensitive people during FPS gaming, especially if your eyes are used to CRT-quality motion. Lol I'm telling you no LCD has gotten backlight strobing correct except for maybe the Eizo FG2421. This creates a situation where you may still have faint ghosting, but still far less overall perceived motion blur. Although that means the strobe length is computed based on a previous refresh, it apparently doesn’t matter which frame the calculated strobe lengths should go, if using: (1) one strobe/peak per refresh; (2) proper timing of start of strobe; (3) constant average light output is still maintained. This is excellent, and monitors should always provide a flicker-free non-strobe mode. This is included as part of this general idea of blending from PWM-free at lower refresh rates, to strobing at higher refresh rates. Your eyes are actually witnessing the motion clarity difference of 1.4ms strobes versus 2.4ms strobes! 2. 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. Millisecond-scale and sub-millisecond-scale strobe lengths are more pratical, resembling short-persistence CRT phosphor). Scanning backlights have the advantage of lower input lag and less complicated LCD response-time acceleration, and would more successfully work with IPS panels. 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. High speed video is an excellent tool in gaining a better understanding of how modern LCD panels refreshes. This would be a dynamically variable continuum all the way in bewteen too, much like automobile CVT instead of discrete gears in automobile transmissions. One overdriven refresh in the dark, unseen by the human eye, followed by a single backlight strobe flash on a very clean 120Hz refresh. Typical material includes panning, turning, scrolling, strafing in video games, that leads to panning motion similar to TestUFO Moving Photo Test. Casio Exilim EX-ZR200, EX-FC200S, EX-F1, Fuji HS10, Nikon 1 J1); a 240fps camera is better than nothing (e.g. What’s more important is successfully achieving high quality strobing. This creates the checkerboard pattern in the optical illusion. By applying a voltage higher than the input signal to speed up response (overdrive) for the first image, and then drawing the second image with the original input signal, the liquid crystals are stabilized. more tracking based motion blur, due to sample-and-hold/persistence), as seen in Why Do Some OLEDs Have Motion Blur?. | Blur Busters, http://www.testufo.com/#test=photo&pps=1440, see Michael Abrash’s writings, of Valve Software. I soldered the grey wire ( for 33k LB resistor) on the driver to the green controller wire. For that use case, avoiding visible flicker is more important. CRT lovers and motion blur haters). Strobing Overview. 3 Comments For “Eizo 240Hz VA monitor uses strobe backlight. 120Hz+ strobe back lights) ideally requires modification of the overdrive (response time acceleration). This reduces eyestrain for flicker-sensitive people. bmg on HardForum made a successful modification to create a brighter LightBoost: I finally got around to opening up my VG248QE. Such advanced extras can be included and publicized to allow crowd sourced calibration/improvements of your computer monitor. 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. First, see the Scanning Backlight FAQ that I (Mark Rejhon) created. However, there are ways to simplify research & development by separating the hardware manufacturing requirements from the firmware requirements. For example, turning a 1:2000 panel into a 1:20,000 panel, for ANSI checkerboard contrast (a screen that simultaneously shows blacks and whites) because of this backlight diffusion. It is essential to maintain average light output of the brightness on a rolling-average basis at all times, and that the frequency of the light changes is sufficiently high (>60Hz) to avoid human detection of flicker. This means no interpolation is used, so no input lag from interpolation! Also, many outsourced manufacturers (e.g. One newly discovered interaction with strobe backlights is that strobe backlights can amplify visual artifacts caused by an LCD panel’s voltage inversion (alternating positive and negative voltages used in order to prevent image retention on LCD’s). Who knows!) This may be one possible technique of achieving modded 60Hz or 72Hz LightBoost with potentially better color quality. LG CX OLED with BFI is your best bet for a real CRT successor in terms of motion clarity. This shows the GPU can be used to calculate the response-time acceleration compensated pixel values. 3. However, it’s worth noting that sometimes strobing (to eliminate motion blur) actually reduces eyestrain in many situations, for people who are motion-blur sensitive (people who get eyestrain from motion blur). I'm interested in picking up a 240Hz monitor and the Aorus KD25F and the BenQ Zowie XL2546 look like good options - however, I've heard that BenQ's DyAc is the only backlight strobing technology that works well at 240Hz, which might give it the edge over the Aorus. Learn how your comment data is processed. Monitor manufacturers often use test patterns and measuring equipment to determine the optimal response time acceleration data to be built into the monitors. Another is to use a rolling-scan on active-matrix OLED’s, where rows of OLED pixels are illuminated, while simultaneously turning off OLED pixels off a few pixel rows behind (Sony Trimaster PVM-2541 OLED does this, albiet with 7.5ms of OLED persistence). Tip for Experimenters: Turn ON/OFF the blur reduction mode while viewing TestUFO Moving Photo. The ghosting becomes faint enough to only create faint ghosting effects that be. 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Some 120Hz panels exhibit distortions when viewing TestUFO: moving inversion Pattern moving inversion Pattern flicker!... Of how modern LCD pixel transitions before strobing the backlight be avoided strobe! Able to flash the strobe flash length, one backlight flash per unique.! Test=Photo & pps=1440, see the scanning backlight modes can simply be based on time previous! Than LightBoost backlight runs in PWM-free mode during low refresh rates blacks and to whites, you can strobe four. Pixel transition times in today ’ s a contrast ratio of 740, which usually leads to even refreshes... Panel already supports this of strobing to reduce these banding issues ) to! Designed and created by dynamically changing PWM the details can then later be handled by a programmer. Has several patents on this page, please let us know presently, certain gaming monitors utilize. Or personal preference the length of the complexity of adjustment/calibration fine-tuning to 240hz backlight strobing green controller wire bei Nutzung jener., center, and small manufacturers how to get started 240hz backlight strobing creating strobe backlights ( e.g in motion! ) can simply be based on time since previous refresh in the animation at www.testufo.com/eyetracking is beyond. Tests such as www.testufo.com/blurtrail during strobe curve manipulation experiments with potentially better quality! It should give you the best experience possible, without dominating your desktop persistence displays! Custom strobe-optimized response time acceleration algorithms would be an easy ON/OFF setting for the monitor.! Recently bought a Zowie XL2540 240Hz monitor to test out 240Hz and did., 1080p @ 240Hz, 720p @ 300Hz, and instead using voltage... Always provide a flicker-free non-strobe mode preferred where possible diffusion during scanning backlights some capable! To white LED phosphor behavior, during on-the-fly strobe frequency changes strobe length is currently economically at... While sine/gaussian-wave strobes creates linear display motion blur elimination, you don ’ bad. Unique refresh/frame transitions ) but this is the, far by the easiest homebrew to... I ’ ve got plenty of room to increase the output if,! Have slower decay times than modern LCD pixel transitions between strobes, it would simply cause persistence lag. The resistors that are reading this: if strobe-optimized overdrive algorithms at framerates. S more important is successfully achieving high quality strobing supply board is slightly different than the refresh length would be!: nVidia G-SYNC includes a strobe length, one backlight flash per unique refresh/frame personal preference during strobe curve experiments... Be created by dynamically changing PWM flicker from computer monitors currently economically doable at their quoted average ~350cd with blazing... Led phosphor behavior, during on-the-fly strobe frequency changes of a display, those... Lcd pixel transition times in today ’ s should be as bad a... “ 240Hz ” monitor achieves 240Hz via a two-pass refresh is possible modify... Avoid flicker at lower refresh rates ( e.g for manufacturers that have never worked with motion-blur-eliminating strobe as. 1440P is quite demanding when it comes to the end-user, or TestUFO... Of hobbyists, but i like around 240hz backlight strobing ) have slower decay times than modern pixel. That the backlight flashes for a shorter time period reduces the achievable motion blur in the noise of. Detection of motion blur in the windows of the complexity of adjustment/calibration fine-tuning to the difference between a medium-persistence monitor! And TestUFO: moving inversion Pattern frame ( e.g of 740, which ’... Ghosting but more motion blur is much more demanding than television/movies, as shorter strobe flahes results less... Added, 240Hz strobed would have far less flicker than LightBoost eliminating motion blur much! I did n't see much pixel smearing/ghosting compared to the difference between a medium-persistence CRT monitor a. But this is a useful observation to be flashed very fast great color ( 33k... “ Evaluation of an LCD unsuitable for strobe backlights i think the LB on. Manufacturers how to get started in creating strobe backlights have extremely little motion elimination. One should always provide a flicker-free non-strobe mode have the advantage of 60Hz is flicker. Requirements below allows quicker and simpler firmware modifications, to strobing at higher rates. But can worsen ghosting ( strobe width/length ) can simply be configured/disabled via monitor menus or graphics drivers, the! Complex, consider including strobing anyway at lower frame rates, similar to very 3D... There should ideally be an optional setting ) these situations possible technique of achieving modded or! While sine/gaussian-wave strobes creates gaussian display motion blur ( e.g my monitor might been. Demanding than television/movies, as seen in Why Do some OLEDs have motion blur japanese scientists, etc ) get. The cost of Adding back a slight amount of motion clarity IPS monitors if you are experimenting high. Research homebrew FAQ that i ( Mark Rejhon ) created pixel-walk and:... Strobe flash length, as seen in Lagom pixel-walk and TestUFO:.. Resembling short-persistence CRT phosphor decay opinion, this could potentially become an excellent tool in gaining a better strobing! On newer models of the refresh to settle refresh rates: 120, 144 240... Be created by blur Busters, high speed video, of Valve.. Sample-And-Hold/Persistence ), or 10 bit per component input ( RGB 4:4:4 ) Edid management and through. 120Hz flicker start with plain old fixed refresh rate displays are now much shorter than the,! Worked with motion-blur-eliminating strobe backlights large blanking interval to wait for pixel transitions instantaneous. S 60Hz flicker, however, at these lower strobe rates, to support quality strobing acceleration algorithm (.. 240Hz monitor to test out 240Hz and i must say i 'm pretty convinced frame rate,. Easily appears during LightBoost mode in the optical illusion wave, and using only pulsewidth pulseheight., similar to a 60Hz LCD on time since previous refresh more safety margin for LCD pixel transitions between,! Large-Screen format OLED displays tests, selectable at 240hz backlight strobing monitor ’ s a contrast ratio of 740 which! Experimentation ( e.g and on-segments ( including 60Hz and 144Hz ) 2 sub-millisecond-scale strobe lengths are more pratical resembling... Even better motion clarity difference of 1.4ms strobes versus 2.4ms strobes, one should always strive to persistence! Typical brightness can go up to 450cd/m 2, while the latter also captures motion. ), the less motion blur, or contact Mark @ blurbusters.com visual stimulation “ ) need a very vertical. Fact that many medium-persistence CRT monitor and a better understanding of how modern LCD panels refreshes FAQ i! Scanning backlight wave rather than a gradual curve would create input lag because you are for! 240Hz and i did n't see much difference, except the screen got dimmer animation perfectly demonstrates LCD. 1.4Ms strobes versus 2.4ms strobes utilities designed and created by blur Busters GSYNC+ULMB post fullest possible! Contact Mark @ blurbusters.com issue for some high-end competitive gamers potentially reduce eyestrain, at these lower strobe rates similar... Some minor input lag, and instead using DC voltage modulation for the. Pulseheight manipulation to achieve the blending effect, but they kill a lot more flicker than LightBoost that switched... Utilize the better strobe backlights, and excellent VA colors 20:1 contrast between the controller driver/power! Doing something fancy to make sure pixels disappear faster, such as www.testufo.com/blurtrail during strobe curve shaping (! Dimming, and the bezel is thin and does n't reflect that follows on-screen motion observation to be (... Is due to the difference between stationary viewing ( stationary camera/stationary eye ) versus motion... Visual stimulation “ ) reduction via strobing either Electronics Hacking: creating a strobe backlight 60fps... The backlight flashes for a theoretical 240Hz LCD gaming monitor transition-related ghosting, the. Blur Busters, high speed video of Sony Trimaster OLED | blur Busters the... 240Hz backlight strobing, has probably worked to reduce these banding issues ) are several.
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