| Author | Message | ||
     Christoph Bungert (Admin) Board Administrator Username: Admin Post Number: 6 Registered: 4-2006  Rating: N/A |
Usually one of the biggest advantages of LCD-displays compared to CRT's is the absence of flicker. The LCD just changes it's state from one frame to another without 'black-phase' inbetween, like CRT's do. BenQ and Samsung now announced LCD-displays which do have a black-phase. The backlight goes off inbetween frames. The reason for this is to reduce blur. To the human eye fast motion on the screen looks sharper if there is a black-phase between frames. Maybe it could have advantages when combining such LCD-displays with 3D-shutterglasses concerning ghosting and page-flipping compatibility. I wonder at which rate these screens will flicker - they have to be faster than 75Hz, don't they? Another issue will be synchronization. Let's assume they flicker at 120Hz, will they accept a 120Hz input signal and keep it intact? Source: Chip, german issue, 05/2006, page 37 I haven't found a fitting link yet. Christoph (Message edited by admin on April 08, 2006) | ||
| Lars Ahnland (Stereoviewer) New member Username: Stereoviewer Post Number: 8 Registered: 4-2006 Rating: N/A |
Thatīs very interesting...  | ||
| Christoph Bungert (Admin) Board Administrator Username: Admin Post Number: 7 Registered: 4-2006 Rating: N/A |
I wondered for some time how they will control the backlight that fast. Current backlights are rather slow I assume. I see the following possiblities: 1) The information is wrong and they don't control the backlight, but do the black-phase using the LCD-cells. 2) They use LEDs as backlight, this will become the standard soon anyway. 3) They use standard light plus some additional light-barrier. 4) They use another unusual light-source. Christoph (Message edited by admin on April 09, 2006) | ||
| Lars Ahnland (Stereoviewer) New member Username: Stereoviewer Post Number: 10 Registered: 4-2006 Rating: N/A |
Christoph, could you do me a favour? Iīm thinking of buying a 40" LCD TFT monitor for use with a laptop and ED-glasses, and need some advice. Iīm not in a hurry though, since I got a Z800 also. I can wait til LCD monitors have developed enough to meet the requirements for creating a good stereoscopic effect, with minimum flicker and ghosting. What do you think those requirements would be? How about response time and refresh rate for instance? I think nVidia will release good drivers pretty soon, since more and more people are using LCD instead of CRT monitors. And by the way, for me a DLP projector is not a good option, since I donīt want to spend $300-$400 per year on lamps. Also, I want a big screen to watch tv on, and a projector makes a too complicated setup in my opinion. Regards, Lars Ahnland (Message edited by stereoviewer on April 09, 2006) | ||
| Peter iak (Hornet) New member Username: Hornet Post Number: 4 Registered: 4-2006 Rating: N/A |
Lars, from my sight the best price/ratio for 3D stereo with e-glasses for gaming or simulators had CRT, The 21" older model I have purchased for 80 EUR. Other way is DLP projector (have Benq PB 6240), 3d efect with e-dim wired glasses is very good,setup is no coplicated (white wall, projector, PC, e- glasses). The experiments with LCD are possible only in interlaced mode with resolution decrease. For sims and gaming, DLP is for my the best. Lamps are expensive, this is right, | ||
| Lars Ahnland (Stereoviewer) New member Username: Stereoviewer Post Number: 11 Registered: 4-2006 Rating: N/A |
Ok, but Iīm not ineterested in projectors, only LCDīs. | ||
| Christoph Bungert (Admin) Board Administrator Username: Admin Post Number: 8 Registered: 4-2006 Rating: N/A |
Up till now LCD and shutterglasses isn't a good combination. This combination creates several problems: - sync errors - polarization problems (e-Dim solved that) - low refresh rate (85Hz at max) - ghosting - resolution loss - low contrast and brightness If it has to be LCD I'd go for an autostereoscopic monitor. Of all the autostereo displays I have seen my favorite is the SeeReal 'cn'. High resolution, very very bright, no visible ghosting, no head/eyetracking required, cheap compared to most other autostereo solutions. If I had unlimited budget I'd buy this one and a DepthQ-projector. Best solution for shutterglasses would be an OLED monitor with high frame rate and stereo-sync-connector. Christoph (Message edited by admin on April 09, 2006) | ||
| Lars Ahnland (Stereoviewer) New member Username: Stereoviewer Post Number: 12 Registered: 4-2006 Rating: N/A |
Hi and thanks for a quick reply. Iīm not an expert so I could use some explanation on techical terms. What do you mean by "sync errors"? And the ghostning, was is the primary factor determining the level of ghosting? As for resolution, Iīv e seen severeal big TFT monitors with ~1900x1200 res. That should be enough, right?. | ||
| Christoph Bungert (Admin) Board Administrator Username: Admin Post Number: 9 Registered: 4-2006 Rating: N/A |
Please check http://www.stereo3d.com/crosstlk.htm What I've heard the eDim-for-LCD only work in half-res mode at this time. So 1900x1200 would give 1900x600 per eye if the eDim-controller can handle this res. in line-blanker mode. However 40'' screens are primarily made for TV, so the max. resolution available should be 1920x1080 for HDTV. Sync errors are discrepancies in the timing between the VGA input signal (which drives the shutterglasses) and the image on the screen. Since digital devices, like DLP, LCD, Plasma, D-ILA, OLED use digital buffers and digital image processing there is a time gap between signal and image. For shutterglasses this can result in dark areas on the screen, additional ghosting and - in the worst case - it won't work at all. Sometimes the gap between input signal and image (or internal buffer) isn't even stable. Christoph | ||
| Lars Ahnland (Stereoviewer) New member Username: Stereoviewer Post Number: 15 Registered: 4-2006 Rating: N/A |
Ok, complicated stuff. Would a low response time on the monitor reduce sync errors? And an other thing: If the maximum vertical sync frequency is 90 Hz, and the horizontal is at 82 Hz, can I calcultae the refresh rate of the monitor then - so that it correlates to the refresh rate freq in nvidias stereo settings? About having to use line-blanker mode: The latest nVida stereo driver supports DCC with LCD panel - it seems itīs flawed though: http://forums.nvidia.com/index.php?showtopic=12417). Itīs still in beta, so they might fix it - or it will be fixed in a near future driver. After all, most people swap their old CRT for LCD these days, and nVidia needs to catch up with the development. (Message edited by stereoviewer on April 10, 2006) | ||
| Christoph Bungert (Admin) Board Administrator Username: Admin Post Number: 11 Registered: 4-2006 Rating: N/A |
vertical sync = refresh rate >>>After all, most people swap their old CRT for LCD these days, and nVidia needs to catch up with the development.<<< The display and projector manufacturers are the ones who should do something. The graphics-card and the drivers are not the problem. Christoph | ||
| Lars Ahnland (Stereoviewer) New member Username: Stereoviewer Post Number: 20 Registered: 4-2006 Rating: N/A |
Well, we all know everyone else but those who are very much into stereoscopic 3D donīt give a shit about stereoscopic 3D. It seems however that the 82.12 stereo driver can handle shutterglasses with LCD monitors, a lot better than EDīs driver. I havenīt used it myself yet, since I haveīnt got a LCD monitor, but I red some promissing stuff about it. |
