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SUBJECT: DILA users! Perfect 1360x768 (16:9) and 1360x580 (2.35) on an unmodified DILA!

FORUM: Home Theater Computers

DATE: 10-01-2000

STATUS: Originally posted on old UBBS system.

NOTE: Other forum members have also since offered slightly revised DILA timings that are also great



___________________


Hi!


Thanks to my visit to AVSCIENCE (staying until tomorrow), I had a chance to really play with a DILA projector powered HTPC! Now I know how to setup pixel-perfect 1360x1024 with no jittery pixels. In fact, I managed to make exact timing duplicates into 1360x768 (16:9) and 1360x580 (2.35:1). All of them locked to the exact scanrate and pixel rate, so you don't need to readjust your Tracking/Phasing control.


The picture quality of a DILA is great via HTPC, provided 1360x1024 is the mode that is used. DVD and television (via dTV software, treating a HTPC like a doubler/scaler) works great on the DILA. Doing 1280x720 or 1360x720 from the HTPC for the HDTV input is MUCH easier to do, but yielded terrible vertical scaling artifacts. The below is a much better way to get a 16:9 computer resolution that has NO scaling artifacts at all.


Use input SXGA3, not SXGA1 or SXGA2, for all of these custom resolutions. These modes required Tracking=24 and Phasing=0 on my system. Some test patterns got slightly worse while some got slightly better, but Phasing=0 gave the best results overall, and made computer text pixelly-sharp at close distances with no fuzzy edges. It is highly recommended to calibrate Tracking and Phasing on a fine black-and-white vertical lines or checkerboard pixel pattern. This can be found in DispalyMate, but you can make a makeshift pattern and tile it as background wallpaper - that does the job.


These are PowerStrip 3.0 screenshots. PowerStrip 3.0 is essential for this, as older versions of PowerStrip will not work. You need to be a registered user of PowerStrip - so purchase the older version anyway. This works on GeForce cards, the card being used right now is a GeForce2 MX. Be warned, it is very difficult to create multiple resolutions with exact dot clocks in PowerStrip 3.0 - I am talking to Ashley at Entech Taiwan to address this very issue, since this is the first time I had a chance to do a REAL torture test of PowerStrip 3.0. (I use a multisync CRT projector at home, so I don't have as big a need for PowerStrip 3.0 at home).


With PowerStrip, you can use vertical picture position to top-align or bottom-align the images. Right now, they are centered vertically as a starting point.


Then you can instantly switch between 1360x1024, 1360x768, and 1360x580 and using only the zoom lens of the DILA to make it fill the screen. You don't even need to use the DILA's vertical picture position. You don't even need to re-fiddle with the tracking/phasing controls, because all 3 resolutions are *perfectly exact* in terms of timings (dot clock). There were no defects and no mouse pointer problems on the GeForce2 MX card during testing. I am using Detonator3 drivers from www.nvidia.com .


Be warned, this won't help your inability to vertically reposition HDTV images on an off-the-shelf DILA - that still requires a DILA modification (which I believe can now be done via DILARD software). I haven't tried DILARD, I just played with an unmodified DILA - it's now possible to use a 2.35:1 screen in a constant-height varying-width configuration for DVD and TV, provided all of that is piped through the HTPC. (dTV is a deinterlacer program for analog TV that has 3:2 pulldown detection. It's a TV viewer that replaces the viewer that comes with many TV tuner/capture cards. More info at www.dscaler.com .


Here's the timings for 1360x1024:
http://www.marky.com/misc/screenshot..._1360x1024.gif


Here's the timings for 1360x768:
http://www.marky.com/misc/screenshot...s_1360x768.gif


Here's the timings for 1360x580 for 2.35:1 projector screen setups:
http://www.marky.com/misc/screenshot...s_1360x580.gif


Since the Advanced Timings does not currently let you change the active lines/pixels (confusing, I know), you have to click "Custom Resolutions..." first to add it, THEN return to the Advanced Timings to fill in the rest of the values. It's easy from there, because the DILA continuously realtime synchronizes as you make adjustments.


Warning: PowerStrip 3.0 Build 51 (and probably similiar builds) has some bugs that causes things to screw up if you hit ESC. I lost sync quite a few times when pressing ESC (it's supposed to revert, but it doesn't!). So click Cancel instead of hitting ESC, if you are at least able to see the screen.

Warning: Adjusting with PowerStrip 3.0 can be a more frustrating-than-expected experience even for power users who understands timings very well I've emailed Ashely a few of the brick walls I ran into. :)
 

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Discussion Starter #2
This is an old post, being reposted by popular request. It used to be on the old UBB forum. A revision is to use a horizontal line total of 1800 (This can be done by reducing horizontal front porch, sync, and back porch by 8 pixels apiece), and to use 75.1 Hz vertical refresh rate.
 

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Thanks Mark.


I've referred to it many a time, and I'm glad you brought it back.


I found that the 71.997 refresh was not the perfect rate with my G11. I ended up with 73.015. For some reason, 71.xxx was not at all clear on my image, even with P & T adjusted. I never di figure out why.


Chris
 

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Any thoughts to posting a guide on how to come up with these numbers (for any projector)? I have a Davis DLX650 (XGA), and I've been trying to get good settings for Powerstrip unsuccessfully.


You know, give a man a fish, teach a man to fish, and all that...


Mike
 

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Quote:
Originally posted by CCLAY
Thanks Mark.


I've referred to it many a time, and I'm glad you brought it back.


I found that the 71.997 refresh was not the perfect rate with my G11. I ended up with 73.015. For some reason, 71.xxx was not at all clear on my image, even with P & T adjusted. I never di figure out why.


Chris
I have G11 with Mark Foster mods and have tried a lot of refresh rates. What works best for tracking is 74.9??kHz for all 3 resolutions. 1024, 768, and 580. Isn't 75kHz the DILA panels rate?
 

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If someone prefers to use 1368 x 1024 instead of 1360 x 1024, how would these instructions differ? I know it may sound anal but for some reason I favor using the entire panel and losing 3 pixels.
 

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Discussion Starter #7
Hi,


1368 works too.


Subtract 8 from either front/back porch and add 8 to horizontal resolution. (You can't simply adjust horizontal resolution, you will need to recreate it first, though.) You may need to use PowerStrip image position to recenter the image. Then you will probably need to readjust DILA tracking/phase to get pixel perfection.
 

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Quote:
A revision is to use a horizontal line total of 1800 (This can be done by reducing horizontal front porch, sync, and back porch by 8 pixels apiece), and to use 75.1 Hz vertical refresh rate.
Are these two separate modifications, or do they go together for some reason?
 

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Discussion Starter #9
They go together. Decrementing horiz front or back porch also decrements the horizontal total.


Basically, horizontal total is the total sum of:

Displayable horiz pixels + horiz front porch + horiz sync pixels + horiz back porch.


Vertical total is the total sum of:

Displayable vert pixels + vert front porch + vert sync pixels + vert back porch.
 

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Hi Mark,


Thanks Mark---but I actually understood your answer about going to 1368 pixels just fine. I was asking a new question about your post about going to 75.1Hz. Let me re-ask the question in a different way.


I'm having trouble getting close to 75.1Hz refresh rate using the settings you're suggesting here. Backing the horizontal total off by 24 will get me 75.042Hz or 75.355Hz, but not 75.1Hz. Here are my final timings, perhaps you can tell me how to get closer to 75.1Hz?


I don't have my D-ILA yet so I've just been messing with this on a CRT monitor.


Horizontal: 79.544kHz

1368 active

0096 front porch

0136 sync

0200 back porch

------

1800 total


Vertical: 75.042Hz

1024 active

0001 front porch

0003 sync

0032 back porch

------

1060 total
 

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Is there a kind sole out there that would spend 10 mins on the phone with me to setup Powerstrip on my G11.


Thank you.


David McGirt -> [email protected]
 

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