Try not to neglect the 90Hz of screen refresh

To @deletedpimaxrep1 or @Matthew.Xu:

As much as Pimax now speaks of a range of 75 to 90Hz of screen refresh, the “75/90” reads like two speeds, 75 or 90. Apart, in the comparisons of speed with other glasses, they put the same speed than the rest of glasses: 90.

In the web in which I participate, many already tell us that we have been scammed (especially those who had already had problems with the Pimax 4K lenses), because the Pimax 8K do not meet the 90Hz; already they comment that it is a deception the same fact of have called it 8K, when they are two screens of 4K (half of the pixels than are considered 8K), aside that it’s rescaled from 2.5K (2.5K or 2K?) per eye, reason why on the subject of not reaching the speed that is considered minimal, they consider it inadmissible.

I am afraid that Pimax, as they have proposed to us with the controllers, will propose to fix the problems in future software updates, which would not stop being a botched job. The CES version and definitive might not have Brainwarp (which has not been talked about for a while) and have a screen refresh of neither 82 nor 80, but of even 75Hz (which is in its range 75-90) If now that they can modify hardware and software they do not seem capable, only with software do they think they can? They could not even know when would be available. Will Brainwarp help us? No professional of prestige (or anyone) has seen if the Brainwarp works in a prototype or if it benefits.

If the problem that prevents reaching 90Hz is an inadequate circuit board or chip, the final design should allow the end user to replace it easily and without losing the warranty. Then it would be enough to send him that circuit or chip.

It can’t be that, after this chip comes out, the future buyers of the Pimax 8K don’t have it, or that they have it and the backers not, regardless of the software improvements.

Using the real 4K without rescaling could be fixed in a similar way; I don’t think that it is necessary to lose the capacity of rescaling, we could use it for less powerful computers.

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They are not “deceiving” us.
They named it the 8K, but it’s not like they are trying to tell us it is 8K vertical.

They were very open from the start saying it was two 4K screens and they were trying to highlight the horizontal resolution.

They are working with Cirque to develop the Cap sense, a company that already has cap sense tech themselves and knows SteamVR as they have developed the Trackpads in the Vive Wands.

The only thing they were not totally open about is the refresh rate. Perhaps it is possible they had no issues with V2 because it used two HDMIs and not a single displayport and they didn’t even think they wouldn’t be able to hit 90 with a single DP. But they have not been totally open with the refresh rate everything else tho they have been totally truthful.

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Something very similar I have responded to those who call us little less than crazy or idiots. They have not change their mind.

The issue of whether it is double 4K or 8K (They should have said ‘Double 4K’, which was already good) is silly, but not reaching “the minimum” of 90Hz has not liked anyone; I hope that Pimax can fix it in some way for the final product, even if it is an update of a circuit panel.

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Your right. If the chip or the panel is the problem they should be demanding their manufacturer to get it right. They are in a much better position than 3 months ago. They should use the huge investment and intrest to convince manufacturers to make customised components for their device or threaten to take their business elsewhere

If they make this product perfect it will be untouchable for the next 2 years

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The principle is good, but completely unfeasible technically try to open a Oculus rift of a Vive yourself and than reassembly it . And no Pimax will not do modular units ( just in case you where thinking of that :wink: Modular design are a thing of the past for high tech gadget, Ipad, Iphone, TV etc. Increase design cost/ complexity, decrease ergonomic possibility and size control. for almost no benefit to the company and in most case the users.

Ask Pimax for a free trading in policy if 90Hz goal is not obtained… the problem with that is that Pimax clearly stated in the risks and challenges section that 80hz is the guarantied value. I concede “clearly stated” at the last minute and under pressure :wink:

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Your thinking in software term, no easy fix for a batch of defective or under-specification chips. 4+15 millions is nothing for a chip manufacturer. and beside those 4 millions belong to us not to chip manufacturer. The real order for now is probably 5000 unit * 20$= 100K$ nothing much to motivate a new silicon batch

if Pimax must wait for another version of the silicon (or another chip) and that fix was not already plan by the manufacturer where taking of months of delay 3-6.

In my humble opinion, the best that we can hope is a 85hz refresh rate done by a twist in the firmware

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Good logic. Time is really the factor. However with rapid prototyping these days you would think turn around is getting faster. Even if somone like Palmer steped in and offered to fund a new component it would take time

Because Pimax Double 4K is a s*** name for a product.

They were very open about the actual resolution of the product.

Obviously I hope they are able to get the HMD to 90Hz, but if they can only get around 82 or 83 it would not be the end of the world for me.

I don’'t think many people will notice the 8Hz difference from a Rift or Vive to the Pimax

Each person is different, many people are able to notice those changes.

Please refer to the topic for CES prototype status.
http://community.openmr.ai/t/ces-2018-8k-prototype-details/4802

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no they aren’t. You would be surprised how often the vive or oculus runs with less then 90 if the game is demanding.

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Normally people realize the lowering of frames and the greater or lesser smoothness. I notice it perfectly, like playing 90 in Oculus Rift and Vive or at real 120 (without reproyection) in PlayStation VR.

The Vive/Rift run at 90 regardless, don’t confuse frame rate with refresh rate.

  1. If the problem was really with the chip and not the underengineered system architecture, and
  2. If the chip manufacturer was able to do a hardware fix, and
  3. If the fix worked, I.e. the new HW rev. passed the qualification, and
  4. If the new chip fits in power/signal conditions of the HMD design,

then you are looking at 6 to 9 months delay at minimum.

And the only way to exchange it will be to resolder a new chip in the HMD and risk people bricking their devices.

So it is possible, but not really feasible, especially for the volume we are talking here - 10k units.

Why would that be a 6 - 9 month delay.

Why would it take so long too acquire a chip that is compatible solder it to a 8K headset and test for a few days to ensure it is stable?

It sounds like it would be a few weeks of work or a month to me.

Doing a revision of the actual chip is what would take a long time 6-9 months is pretty short even for that.

If it is just noise on the circuit then either they can redesign the PCB to lower interference, increase cooling to the chips so they can operate closer to their optimum specifications.

Another option is to add a DisplayPort booster chip that cleans up the noise from the line, they could probably add it as a second PCB at the rear of the headset so that it is separated from the interference of the displays and the display drivers. A crazier idea would be to put a real DisplayPort 1.4 splitter on the rear PCB and then just feed two DisplayPort 1.2 lines in directly to the scaler. I can’t find a source for those chips but it looks like they may exist.

Hey @deletedpimaxrep1, do any of those ideas sound possible?

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I’m very pleased to hear there is asw. That ontop of brainwarpnshould be really good.

Here is a link to a displayport booster chip that should work for this: SN65DP141 data sheet, product information and support | TI.com

Just a thought if the signal integrity is what is causing the problems, not something deeper in the chip.

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If the system must resort to asw or brianwarp to compensate for low FPS I would like to see that threshold level be user selectable. That is, if my vision and gut can tolerate less than 90hz let me chose to not use any “fixes”. Let me chose the FPS threshold.

All I play is racing sims so I’m seated and mostly looking straight ahead except for quick glances to the side. I have a feeling I won’t get sick at a little less than 90 FPS.

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90hz refresh has nothing to do with FPS, two diferent things.

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