How are 144hz screen possible?

Submitted ⁨⁨1⁩ ⁨year⁩ ago⁩ by ⁨Kyoyeou@slrpnk.net⁩ to ⁨nostupidquestions@lemmy.world⁩

Had this reflection that 144hz screens where the only type of screen I knew, that was not a multiple of 60. 60 Hz - 120hz - 240hz - 360hz

And in the middle 144hz Is there a reason why all follow this 60 rule, and if so, why is 144hz here

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CubbyTustard@reddthat.com ⁨1⁩ ⁨year⁩ ago
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- Kyoyeou@slrpnk.net ⁨1⁩ ⁨year⁩ ago
  Wow that’s crazy logical!
  
  Im sick in my bed right now and forgot I used to have a bad 75hz screen 😅
  
  Thank you!
  
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MeanEYE@lemmy.world ⁨1⁩ ⁨year⁩ ago
With computer displays only limitation is hardware. If I had to hazard a guess, 144Hz is there because that’s approximately maximum supported on widest range of hardware and 144Hz crystals were widely available and therefore cheap. Kind of how there’s a huge market for rollerblade ball bearings. Pretty much all of the power tools are using them. They are simply everywhere because they are cheap.

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- BossDj@lemm.ee ⁨1⁩ ⁨year⁩ ago
  I was really hoping you were Lemmy’s 1996 rage in the cage account making every conversation about ball bearings
  
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  - MeanEYE@lemmy.world ⁨1⁩ ⁨year⁩ ago
    Haha, never heard of that.
    
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- Willy@sh.itjust.works ⁨1⁩ ⁨year⁩ ago
  Tell me more about the ball bearing industry please!
  
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  - frank@sopuli.xyz ⁨1⁩ ⁨year⁩ ago
    Also subscribing for roller blade ball bearing facts
    
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  - MeanEYE@lemmy.world ⁨1⁩ ⁨year⁩ ago
    Haha, very little experience with that. But I do know rollerblade bearings are now most popular bearings thanks to low prices because of their initial popularity. Kind of how 18650 cell became popular because of laptops and is now virtually everywhere, including EVs. It’s all playing at large scale with manufacturers.
    
    Not sure what’s the part you are interested in. I did learn about them in school, so perhaps I do have some knowledge you might find interesting.
    
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- Madison420@lemmy.world ⁨1⁩ ⁨year⁩ ago
  Divide. They needed buffer room because 30 60 or 120hz aren’t always exactly 30, 60, or 120hz. Like you said 144 was just the cheapest that net or exceeded spec.
  
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- astraeus@programming.dev ⁨1⁩ ⁨year⁩ ago
  LCD crystals do have a theoretical maximum, but we don’t have display drivers or transmission standards that support those frequencies.
  
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  - MeanEYE@lemmy.world ⁨1⁩ ⁨year⁩ ago
    Didn’t mean LCD crystals, but just crystal oscillators that are used for timing.
    
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MxM111@kbin.social ⁨1⁩ ⁨year⁩ ago
I have 160Hz screen.

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- OpenHammer6677@lemmy.world ⁨1⁩ ⁨year⁩ ago
  Mine is an odd number, 165hz
  
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  - SolOrion@sh.itjust.works ⁨1⁩ ⁨year⁩ ago
    75hz here. I thought it was pretty weird. It’s basically extra spicy 60hz.
    
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JustEnoughDucks@feddit.nl ⁨1⁩ ⁨year⁩ ago
72 Hz was used as a refresh rate for CRT monitors back in the day. 72 * 2.

It is likely a holdover from that era. I think from there is was a multiple of 24 HZ so movie content scaled smoothly without tearing before vsync? Last part is a guess.

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- zephr_c@lemm.ee ⁨1⁩ ⁨year⁩ ago
  Old reel projectors actually flashed their light at 72Hz. They had to turn off the light to move the reel to the next slide so you couln’t see the pictures moving up off the screen, and human eyes are better at spotting quickly flashing lights than they are at spotting microstuttery motion, so flashing the bulb once per frame at 24Hz in a dark room was headache inducing. The solution they came up with was just to flash the bulb 3 times per frame, which is 72Hz.
  
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- astraeus@programming.dev ⁨1⁩ ⁨year⁩ ago
  144Hz is not a holdover in the case of computer monitors. It’s the maximum bandwidth you can push through DVI-D Dual-link at 1080p, which was the only standard that could support that refresh rate when they began producing LCD monitors built to run 144Hz.
  
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- s38b35M5@lemmy.world ⁨1⁩ ⁨year⁩ ago
  I had to scroll a bit to make sure this answer was here before I wrote the same. 👍
  
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MeanEYE@lemmy.world ⁨1⁩ ⁨year⁩ ago
Wait until you find out why 24.9 was a standard and still is for most of the movies. Logical at the time, completely retarded today.

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- dustyData@lemmy.world ⁨1⁩ ⁨year⁩ ago
  Is that the same reason that 30fps and 29.97 fps are two different things?
  
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  - MeanEYE@lemmy.world ⁨1⁩ ⁨year⁩ ago
    They are related. Black and white TV was fine and running at 30 frames for obvious easy timing since USA grid is 60Hz, but then introduction of color caused interference between chroma channels. So signal became backwards compatible, luminance channel was black and white while color TVs used two additional channels for color information. Whole 29.97 was a result of halving 60/1.001≈59.94. That slowing down of 0.1% was to prevent dot crawl, or chroma crawl. So all of today’s videos in 29.97, even digital ones, are in fact due to backwards compatibility with B&W TV which no longer exist and certainly pointless when it comes to digital formats.
    
    On the other hand 24fps was just a convenience pick. It was easily divisible by 2, 3, 4, 6… and it was good enough since film stock was expensive. Europe rolled half of their power grid which was 50Hz, so 25… and movies stuck with 24 which was good enough but close enough to all the others. They still use this framerate today which is a joke considering you can get 8K video in resolution but have frame rate of a lantern show from last century.
    
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  - smallaubergine@kbin.social ⁨1⁩ ⁨year⁩ ago
    It's actually 23.976 and yes it's because of NTSC frame rates. But increasingly things are shot now at a flat 24p since we're not as tied down to the NTSC framerate these days.
    
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- MeatsOfRage@lemmy.world ⁨1⁩ ⁨year⁩ ago
  Well, share with the class
  
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  - MeanEYE@lemmy.world ⁨1⁩ ⁨year⁩ ago
    Did so, in other comment in this thread. :)
    
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VR20X6@sh.itjust.works ⁨1⁩ ⁨year⁩ ago
ITT: A ton of people who think computer displays can only sync at a single clockrate for some reason.

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- JohnEdwa@sopuli.xyz ⁨1⁩ ⁨year⁩ ago
  Fun fact, quite a few monitors can be overclocked simply by creating a custom resolution. I have a 32" Thinkvision that officially only supports 1440p 60hz but it’s fine running at 70hz when asked to.
  
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Laser@feddit.de ⁨1⁩ ⁨year⁩ ago
The reason 60Hz was so prominent has to do with the power line frequency. Screens originated as cathode ray tube (CRT) TVs that were only able to use a single frequency, which was the one chosen by TV networks. They chose a the power line frequency because this minimizes flicker when recording light powered with the same frequency as the one you record with, and you want to play back in the same frequency for normal content.

This however isn’t as important for modern monitors. You have other image sources than video content produced for TV which benefit from higher rates but don’t need to match a multiple of 60. So nowadays manufacturers go as high as their panels allow, my guess is 144 exists because that’s 624Hz (the latter being the “cinematic” frequency). My monitor for example is 75 Hz which is 1.550Hz, which is the European power line frequency, but the refresh rate is variable anyways, making it can match full multiples of content frequency dynamically if desired.

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HubertManne@kbin.social ⁨1⁩ ⁨year⁩ ago
the numbers are a maximum and software can alter it lower or split it up. I worked in a visualization lab and we would often mess with the refresh rates. That being said you could alter it and the screen would not respond (show an image) so there must be some limitations.

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skullgiver@popplesburger.hilciferous.nl ⁨1⁩ ⁨year⁩ ago
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- MeanEYE@lemmy.world ⁨1⁩ ⁨year⁩ ago
  It’s not by chance 60fps. It was chosen because power grid in USA is 60Hz, so it was easy and cheap way to synchronize frames without having additional timing hardware. As for 59.97, that was a 0.1% slowdown introduced when color TV was added to prevent cross-talk in chroma channels. Weird solution but it worked out fine. Today there’s no reason for sync anything with power grid but 60 is still a very convenient number as it’s easily divisible by many others.
  
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  - skullgiver@popplesburger.hilciferous.nl ⁨1⁩ ⁨year⁩ ago
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  - Overzeetop@kbin.social ⁨1⁩ ⁨year⁩ ago
    Funny effect, though - many cheap electronics (think coffee makers and microwave ovens) use the line frequency as a time base. Taking a 60Hz or 50Hz appliance and plugging it into the other causes the clock to be off.
    
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astraeus@programming.dev ⁨1⁩ ⁨year⁩ ago
60Hz was the original clock rate, determined by US power cycles way back in the day. This was 50Hz in some countries.

With LCD screens, the potential for higher frame rates became easier to achieve. They began to advertise 120Hz TVs and monitors, which set a new bar for frame rates. Some advertise 75Hz monitors, slightly better than 60Hz when crunching numbers. 75Hz is achieved by overclocking standard 60Hz control boards, most can achieve this refresh rate if they allow it. Later HDMI standards, DisplayPort and DVI-D support this frame rate at least up to 2K.

144Hz is the same trick as 75Hz, this time with a 120Hz control board. The true standard frame rate is 120Hz, it is clocked higher to achieve 144Hz. Why 144 exactly? This was most likely due to the lack of standards that originally supported higher frame rates. Dual-link DVI-D was the only one which could push 144Hz at 1080p. Any higher frame rate (or resolution) and the signal would exceed bandwidth. Now 144Hz is simply a new standard number and plenty of 1440p monitors are set to this frame rate.

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- r00ty@kbin.life ⁨1⁩ ⁨year⁩ ago
  Just to point out. I had 120hz on a CRT monitor back in the late 90s/early 2000s. The resolution was terrible though (either 640x480 or 800x600). At good resolutions (1024x768 or 1280x960) you were generally stuck with 75 to 90 at best.
  
  60hz LCD screens were one of the reasons there was resistance among game players to move to LCD. Not to mention earlier units took a VGA input and as such the picture quality was usually bad compared to CRT and added latency. People buying LCDs did it for the aesthetics when they first became available. Where I worked, for example only the reception had an LCD screen.
  
  Also, on a more pedantic point. 50hz is the power line frequency in the majority of the world.
  
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  - Meho_Nohome@sh.itjust.works ⁨1⁩ ⁨year⁩ ago
    That proves that the USA is 10 better than the rest of the world.
    
    (Except American Samoa, Anguilla, Antigua, Aruba, Bahamas, Belize, Bermuda, Brazil, Canada, Cayman Islands, Colombia, Costa Rica, Cuba, Dominican Republic, Ecuador, El Salvador, Guam, Guatemala, Guyana, Haiti, Honduras, South Korea, Mexico, Micronesia, Montserrat Islands, Nicaragua, Okinawa, Palmyra Atoll, Panama, Peru, Philippines, Puerto Rico, St. Kitts & Nevis Islands, Saudi Arabia, Suriname, Tahiti, Taiwan, Trinidad & Tobago, United States (USA), Venezuela, Virgin Islands, and western Japan)
    
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  - astraeus@programming.dev ⁨1⁩ ⁨year⁩ ago
    On your pedantic point, I can’t argue. However, I can say 60Hz power cycles are what set in stone the 60Hz standard. This is in spite of the fact that a lot of countries didn’t even have 60Hz screens until screen controller clock rates were decoupled from power line frequencies.
    
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- Phanatik@kbin.social ⁨1⁩ ⁨year⁩ ago
  Clear explanation! I assume the overclocking is the reason why my monitor goes to 165Hz.
  
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videogamesandbeer@lemmy.world ⁨1⁩ ⁨year⁩ ago
My iMac says it’s 77hz.

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Asudox@lemmy.world ⁨1⁩ ⁨year⁩ ago
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- lukewarmtuna@lemmy.world ⁨1⁩ ⁨year⁩ ago
  Display refresh rates, measured in hertz (Hz), significantly impact the smoothness of motion on screens. A display with a 60Hz refresh rate updates the image 60 times per second, each update representing a frame. Thus, at its maximum capacity, a 60Hz display shows 60 frames in one second. In contrast, a 360Hz display updates its image 360 times per second, allowing for the potential display of 360 frames in the same duration. This rapid succession of frames results in a markedly smoother visual experience, as the human eye perceives motion more fluidly when more frames are displayed per second.
  
  Conversely, a display with a lower refresh rate, like 24Hz, refreshes the image just 24 times per second. This lower frequency results in a more ‘choppy’ or stuttered visual experience due to the fewer number of frames presented each second.
  
  Analogous to a film projector, increasing the frame rate for smoother motion requires the film to move faster through the projector. However, without additional frames in the source material, this would simply speed up the playback. To maintain normal playback speed while achieving a higher frame rate, the source material must contain more frames. For instance, to sustain standard playback speed on a 360Hz display (which is 6 times faster than a 60Hz display), the source needs to provide six times as many frames per second.
  
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- thenewred@lemmy.world ⁨1⁩ ⁨year⁩ ago
  The unit “hertz” means “per second”. A higher value is still one second, but more events per second.
  
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- BilboTBaggin@lemmy.world ⁨1⁩ ⁨year⁩ ago
  All of the frames in the number (30, 60, 144, 360, etc) are shown in one second. So for 360 Hz you’re seeing a new frame every 1/360 = 0.0028 seconds vs 1/60 = 0.017 seconds which gives a smoother transition from frame to frame
  
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