Successful Overclock 60Hz -> 180Hz of Laptop LCD!

Talk about overclocking displays at a higher refresh rate. This includes QNIX, Catleap, Overlord Tempest, SEIKI displays, certain HDTVs, and other overclockable displays.

Successful Overclock 60Hz -> 180Hz of Laptop LCD!

Postby lol37 » 16 Jan 2014, 12:27

Hello all,
today i discovered that awesomely, i could overclock my cheap TN laptop monitor which his default frequency ( and max according to windows ) is 60hz
i could easily go beyond 200hz ( without hardware modding ), the max i reach is about 210hz, after that it was black with a white stripe scan pattern (i can send screenshots as a proof) thought there were some artifacts
As i said it surely might be in the best case 5ms GTG monitor screen, so monitors manufacturers deliberaly flange their vertical frequency
my question is : does all monitors could be modded in a way to remove this "hardware" (if it could be called like this) limit ? ( as cirthix did )
if a 5ms GTG laptop or worse could go beyond 200hz, i dont know why there's this 144hz boundary for 1ms GTG ! ( maybe for warranty/pixel artifacts ? )
it would help a lot for old fast paced games which high fps isnt uncommon, coupled with a decent strobing, it would require less strobe brightness for the same persistence

Mark Rejhon wrote:Moderator's Edit:
Chief Blur Buster here to amend the OP; to add photographic/video proof:
This is real, no frame skipping, it passes http://www.testufo.com/frameskipping
Here is proof of lol37's successful 60Hz -> 180Hz overclock of this laptop LCD.
An unmodified HP Pavillon dv7 laptop, doing confirmed 180Hz refresh rate.

Image

And the video proof of true 180Hz, zero frameskipping, in action!

phpBB [video]


If you want to tell others about it, feel free to share this news:
Code: Select all
http://forums.blurbusters.com/viewtopic.php?f=8&t=188&p=1655
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Re: Overclockable monitors [successful overclock 60Hz -> 180

Postby Chief Blur Buster » 16 Jan 2014, 13:02

lol37 wrote:Hello all,
today i discovered that awesomely, i could overclock my cheap TN laptop monitor which his default frequency ( and max according to windows ) is 60hz
i could easily go beyond 200hz ( without hardware modding )

Excellent!
Can you please post the proof -- a camera photograph of http://www.testufo.com/frameskipping

lol37 wrote:As i said it surely might be in the best case 5ms GTG monitor screen, so monitors manufacturers deliberaly flange their vertical frequency
my question is : does all monitors could be modded in a way to remove this "hardware" (if it could be called like this) limit ? ( as cirtrix did )
if a 5ms GTG laptop or worse could go beyond 200hz, i dont know why there's this 144hz boundary for 1ms GTG ! ( maybe for warranty/pixel artifacts ? )

GtG (pixel transitions) doesn't define refresh rate.
There are GtG longer than refreshes (e.g. old 60Hz monitors with 33ms response)
There are GtG shorter than refreshes (e.g. newer 120Hz monitors with 1ms response)

The side effect of GtG longer than refreshes is overlapped refreshes (streaking).
See high speed videos of LCD refreshing in action to understand how LCD refreshes. These are simply high speed videos of http://www.testufo.com/flicker.

You can't refresh all pixels simultaneously, you have to refresh pixels one at a time. The faster/briefer you try to refresh pixels (to finish the whole screen at higher Hz), the colors degrade. That's why colors are worse at 144Hz than at 60Hz. Also, display cables have a bandwidth limitation. And display driving electronics have performance limits, too. So you've got to balance those compromises too. That said, I believe the technology is about to arrive to put true-240Hz monitors on our desks, and Blur Busters would welcome them!
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Re: Overclockable monitors [laptop LCD overclocking]

Postby lol37 » 16 Jan 2014, 13:12

Well i dont own one of theses professional cameras so i won't be able to show that kind of proof sorry !
i highly believe there's frameskipping, which could be expected on this kind of screen
i could expect decent quality with 200hz 1ms GTG monitor capable modding since 1ms < 5ms = full black white black transition
in old FPS games colors doesn't take really any importance, you just have to discern your opponents quickly as you can !
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Re: Overclockable monitors [laptop LCD overclocking]

Postby Chief Blur Buster » 16 Jan 2014, 13:18

lol37 wrote:Well i dont own one of theses professional cameras

Not that specific test (professional is optional). Read again please. It works with an iPhone/Android camera. All you need is a slow-behaving camera. You already know iPhone cameras behave more slowly when taking pictures in the dark than when taking pictures outside. All you need do is adjust monitor brightness until the camera takes something that resembles the linked photos. Viola! :D

So yes, please take a picture now using your cell phone. I'm excited to see your photo proof! :D
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Re: Overclockable monitors [laptop LCD overclocking]

Postby lol37 » 16 Jan 2014, 13:59

mhhh wait, would be need no frame skipping at all to be a valid overclocking, or you just want the frequency proof ?
if first case i'm sorry i know in advance it cant overclock past to 200hz or even less !
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Re: Overclockable monitors [laptop LCD overclocking]

Postby Chief Blur Buster » 16 Jan 2014, 17:22

Ah, you already know in advance that it's frame skipping?

Even when it's frameskipping at 200Hz, there can be advantages to overclocking: Lower input lag.

Ideally, you want to do an even multiple, such as 180Hz. This at least skips 2 frames out of 3, if the LCD is still refreshing at 60Hz.
But you end up getting less input lag, because of a 1/180sec frame transmission between GPU and display, rather than a 1/60sec frame transmission. Even 60Hz@180Hz (frameskipped) may still feel better for competitive gameplay, in twitch games such as Quake Live.
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Re: Overclockable monitors [laptop LCD overclocking]

Postby Neo » 16 Jan 2014, 17:29

Chief Blur Buster wrote: The faster/briefer you try to refresh pixels (to finish the whole screen at higher Hz), the colors degrade. That's why colors are worse at 144Hz than at 60Hz.


Chief, would you know if Low Temperature Polysilicon (LTPS) (or IGZO) would help with faster refreshes? Other than the more well-know benefits of LTPS/IGZO such as the transparent transistors and integrated circuits on the glass substrate, it also allows more energy to be transferred to the liquid crystals. This is usually mentioned in the context of power saving as refresh "pausing" but could it not also allow a more powerful energizing and briefer access time?


EDIT: Added IGZO tech as well.
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Re: Overclockable monitors [laptop LCD overclocking]

Postby lol37 » 16 Jan 2014, 18:35

yeah i know it but it is not for real business, high frequency is useless without low pixel transition time, it would be still quite a lot of motion blur
i'm better off buying a real monitor made for this.
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Re: Overclockable monitors [laptop LCD overclocking]

Postby Chief Blur Buster » 16 Jan 2014, 22:16

Neo wrote:Chief, would you know if Low Temperature Polysilicon (LTPS) (or IGZO) would help with faster refreshes? Other than the more well-know benefits of LTPS/IGZO such as the transparent transistors and integrated circuits on the glass substrate, it also allows more energy to be transferred to the liquid crystals. This is usually mentioned in the context of power saving as refresh "pausing" but could it not also allow a more powerful energizing and briefer access time?

That's a good theory, though I'm not 100% sure how this would work in practice.
Either way, IGZO transitions are fairly slow at the moment, but once they become faster, these might actually end up being useful attributes. But what stands out is the refresh pausing capability: That helps for G-SYNC. IGZO probably would be very G-SYNC friendly due to its better refresh pausing capability, which means it can probably easily keep refreshes stable during variable refresh rate. G-SYNC is essentially a series of tiny, variable-length refresh pauses (with a lot of magic pixie dust thrown in -- er, things like processing to keep colors stable during variable refresh rate).
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Re: Overclockable monitors [laptop LCD overclocking]

Postby lol37 » 17 Jan 2014, 04:52

here are videos, http://www.youtube.com/watch?v=9ODFZknRK1I ( 180hz )
http://www.youtube.com/watch?v=cKeWx-06V5c ( 200hz, though some syncs problems, but it works ! )
i guess the fps drops is caused by running systems service, and i'm using windows 8 so its quite heavy.
i will try to connect a vga thru a PC
EDIT : it seems i can't display from a PC to a laptop monitor too bad !
EDIT2 : http://www.youtube.com/watch?v=EJYnK9xun_g
playing fps 200hz@200fps with a 1000hz mouse is just unbelieviable, a smoothness that i never saw before !
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