Can i use 8k to project my pc screen into it?

Pimax 8K Series
21

Awesome post for a number of reasons! The StarVR article should answer the 180°/360° video question that some folks have been asking with the 5k/8k headsets!

I have skimmed over Cinera. We’d need the ppd info for a proper compare.

The 5k in this case would not be as good as the Cinera for the reason you said binocular overlap vs % of fov.

Imo the 8k/8kx should look on par or better. We should be able to calculate an idea of ppd for the binocular overlap to screen ratio. Even though the PiMax will have a higher fov binocular overlap.

My opinion without getting into too heavy math. If we use standard vr headsets have 90 to 110 fov binocular overlap.

So let’s base the idea that 50% of the screen is overlapped. 1920x2160 per eye vs 2560x1440. The ppi on the 8k will still be 806?ppi vs 490 to 510 ppi of the Cinera.

So the Cinera may look better due to more potenial screen usage to projected Movie screen. However if the video player can utilize Brainwarp might make video appear more fluid with the refresh spin to 150 to 180. Without having this its all speculation as to which will have better experience for video watching.

However I would say we need someone who has reviewed the Cinera to try/review the 8K with preferably the same video.

Though I do find it interesting that while some complain about the naming conventions all that seem to be using dual 1440p screens are saying 5k :v::joy::+1:

22

Edit… For screen density the overlap is likely to be 65%+ as with angling the screens more of the screen is used for the overlap. With peripheral fov you don’t need as much screen. If i understand this correctly.

At 65% 2496x2160 witg the 4k’s 806?ppi should make the 8k to have nicer picture. But contrast ratios & brightness can affect perception.

PC side Stronger graphical & cpu power.
More feature sets & options to improve quality & performance.

Android -Low power, portable & specilized OS. All In One. Cordless? If so more options for use when travelling/camping. Yes you can buy a vr laptop & have a portable setup battery life on either coud be interesting.

Still be best to have a reviewer who has tried both to offer perspective.

23

I am by no means an expert in this field, but my own method of determining resolution image quality (Pixels Per Degree or PPD in this case) is to divide the number of horizontal pixels of one of the screens by the number of degrees in the FOV:

Here are my results (the maximum amount of detail a person can resolve with regular 20/20 vision works out at about 58 PPD):

Cinera: 2560/66˚ = 38.78 PPD (Cinera round it up to 39PPD in their own marketing materials)

Pimax 8K: 3840/200˚ = 19.2 PPD

Therefore, my conclusion is that, for the purposes of watching movies, the Cinera is able to concentrate approximately double the number of pixels into the 66˚ POV area which the movie is actually presented on, which apparently represents approx 95% of the total screen area on the Cinera.

Obviously, the PIMAX 8K boasts the highest overall resolution on the screen, but it is designed to fill your entire peripheral view with those pixels for an immersive VR experience, not optimise them to fit in a rectangular movie screen.

Here is an excerpt from Cinera’s campaign marketing material which explains the differentiation between PPI and PPD:

More Pixels, More Quality . . . Or Not?

You probably have heard of PPI, or Pixels Per Inch. (Most of us became familiar with the term thanks to Apple’ retina display.)

While PPI can be a helpful stat, it doesn’t tell the entire store. PPI only illustrates the pixel density of a display—not necessarily what the human eye can actually see. Your sight can be affected by a handful of other factors, like distance to the display or optical lens.

PIXELS PER DEGREE (PPD)

Instead, a more efficient way to measure display quality is with PPD—Pixels Per Degree.

PPD translates to the number of pixels per degree in human vision. The higher the number, the nicer quality image you get to enjoy.

In terms of framerate, Cinera confirm that their headset will display the video in its native framerate (again, VR has greater technical requirements in this area than watching a movie).

This is all based on my limited understanding of the technology, so I am happy to be corrected if I have got this totally wrong. Also, I totally agree that in the end it all comes to user experience over technical specifications, as there are plenty of other factors that influence the perceived image quality.

Here is a link to an interesting paper that questions exactly how much image detail we actually need (albeit in relation to cinema screens and televisions, as opposed to headsets): http://www.gfd.ie/why-4k.pdf

:slight_smile:

1 Like
24

It looks good though there is factor that might need to come into play. Cinera is utilizing the the entire display morevor less in 66° Fov. So yes the density should be higher.

The 4k model with using the formula should be 1980/110=18 with advertised specs.

Screenshot_2017-10-09-08-11-39.png1440×2560 392 KB

Cinera is using 100% screen overlap.

Now with the 8k however we would need to know the percentage of the panel utilized in the overlap & the FOV of the overlap.

While the 8k has 200° FOV part of it is outside the main view area (peripheral).

@deletedpimaxrep1 @Bacon @PimaxVR

How much of the display percentage wise is overlapped & at what FOV is the overlap? As this will allow an accurate ppd calculation.

1 Like
25

@deletedpimaxrep1 @Bacon @PimaxVR

Still no response on this question after 3 days? :frowning2:

1 Like
26

Try a new thread.
I was getting different answers from different sources. Better to wait till they release the next version…

27

it seems I missed this post, sorry. I will check tomorrow once arrived at the office.

3 Likes
28

Hi all.
For Pimax 8K currently we are utilized 80% display panel, and now are trying to optimize
optical design to use the entire display with 200 degrees FOV. That means the current PPD= 238400.8/200=30.72,Theoretically it can be 2*2840/200=38.4.

For the overlapped FOV, it is from 110 degree to 120 degree,approach to human limit of overlapped FOV.

5 Likes
29

Hi @bacon, I appreciate you responding to my post. :slight_smile:

Thanks for providing the data. That second calculation seems to have a typo, I presume you meant: 2*3840/200=38.4?

38.4 PPD would be very decent! :smiley:

30

Yes, that is the Ideal situation, we are trying to optimize.

1 Like
31

Hi all.
For Pimax 8K currently we are utilized 80% display panel, and now are trying to optimize
optical design to use the entire display with 200 degrees FOV. That means the current PPD= 238400.8/200=30.72,Theoretically it can be 2*2840/200=38.4.

For the overlapped FOV, it is from 110 degree to 120 degree,approach to human limit of overlapped FOV.

Bacon, I would definitely focus on 110 degrees or 120 degrees because of binocular overlap, and because increased ppd at this FOV will be great for all existing VR content.

Trying to make lenses for a 60 degree FOV (for movies) would be too niche.

1 Like