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chilledsanity
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« on: July 18, 2007, 06:27:35 PM » |
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I have a question about the PCS operates in stereoscopic mode. I've used the Nvidia drivers before with regular shutter glasses and when I did that, it would update the image one eye at a time. So when one eye was being displayed, the other eye would be "blacked out" so that the image would stay in sync with my monitor.
I'm wondering if the PCS does this or if they are able to retain the image for one eye while the other eye updates, or do they switch to black and alternate? I was thinking since it uses LCD panels, holding the image until the eye updates again would help with brightness levels and prevent any possible ghosting as a result.
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suart
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« Reply #1 on: July 19, 2007, 12:49:04 PM » |
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Yes the way you describe the images alternately turning on and off is how our stereoscopic mode works.
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chilledsanity
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« Reply #2 on: July 19, 2007, 08:05:59 PM » |
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I apologize that I don't completely understand your answer. For the "off" image, does it turn the LCD panel black (even if it would be just milliseconds), or does the previous image stay there until it turns "on" again?
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shaneb
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« Reply #3 on: July 24, 2007, 07:30:07 PM » |
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The LCos display is always loaded with either left eye or right eye information, we turn ON or OFF the left or right light engine so only the display is seen by the correct eye at the correct time.
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chilledsanity
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« Reply #4 on: July 26, 2007, 02:39:31 AM » |
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I'm sorry I'm not making myself clearer about this, but I do understand that aspect of the device. I'm wondering what happens to the panel that is OFF. Again, this happens dozens of times per second, but say for a split second the Left eye is ON and the right eye is OFF. What is being seen on the right eye?
1. The last image to be updated prior to the left eye
2. Black
If you're not sure, a real easy way to answer this question is this: Does the brightness level change at all when the PCS is in stereo mode?
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shaneb
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« Reply #5 on: July 26, 2007, 01:17:51 PM » |
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The PCS Visor has one Lcos Panel so when the right eye is off the display is loaded with the left eye information and the left light engine is turned on leaving the right eye dark.
So your question about brightness is a good one. To compensate for only illuminating one eye at a time we double the brightness of the light engine so there is no difference in brightness when going from 2D and 3D viewing.
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chilledsanity
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« Reply #6 on: July 29, 2007, 12:53:31 PM » |
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Thanks, that clears it up for me. While it might have been a little nicer to see if it was possible to hold the previous image instead of switching back to black, it still won't stop a sale from me. It just might mean there will be a little bit of eyestrain when in stereoscopic mode.
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tmiv
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« Reply #7 on: February 15, 2008, 12:55:53 PM » |
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It seems like he is saying that it can't hold both images up at the same time because there is only one screen. So there are filters in front of each eye that alternate turning opaque.
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StereoFan
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« Reply #8 on: August 18, 2008, 05:20:40 AM » |
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Hi,
I have some experience with stereoscopic principles and hardware. I have owned shutterglasses, a 3D monitor, and I have looked at HMDs. Either you halve the refresh rate or you double the processing load on the video card(s). You seem to have opted for the halving the refresh rate (rendering 800x600).
Instead of making one eye dark at a time, why not simply hold the image constant in the "dark" eye for 2 cycles? This would create constant, steady image with half the refresh rate, and would avoid a "flickering" affect that is noticable as a dimmer image. I understand what you are saying about doubling the brightness, but that seems it would have other (perhaps hard to predict) viewing effects as well. It seems that you would be creating a pulsed wave of double the brightness.
Edit: duh, sorry I just thought it through and I realized what you are really doing. You only have one LCD panel of 800x600 pixels to work with, so you have to make one eye dark and then the other eye dark. I'm still interested in what users report as the viewing experience, however.
End Edit.
What do viewers of the 3D mode with Headyplay report is their visual experience?
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