2405 Techical Know-it-alls - HELP! :)

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NavyH16

Limp Gawd
Joined
Dec 11, 2004
Messages
172
Hey guys,

I'm trying to show the LCD video lag stuff to Kyle and I need some assistance pulling up the links to all the tech stuff we've pieced together. I need:

1) A link showing the 2405 uses "Overdrive technology"
2) A good link explaining "Overdrive technology"
3) A link to the panel the 2405 is using (Samsung, right?)
4) What other monitors have "Overdrive technology"?

Anything you guys can find or know already would be GREATLY appreciated.

EDIT: So rephrasing in lieu of the fact the 2405 DOESN'T have OD apparently... our woes must be to DSP operations from the gm1601.

1) What other monitors use the gm1601?
2) Anyone have one so we can do the famous clone test? ;)

Navy
 
I've been trying to dig up some information as well. As a recap of what I've found, the samsung 244t has the exact same lag problem (I tested myself with a crt). There is also a post with a video showing the dell 2001fp with this issue, you can find that here:

http://weblogs.asp.net/ryanw/archive/2004/09/23/233681.aspx

Here is all the video demos I have found about it:

http://media.putfile.com/Movie_0001914
http://s88012115.onlinehome.us/TFTDelayBeweis.avi
http://personal.testdata.com/CrtLcdComparo.wmv

Here are some articles that talk about overdrive (response time compensation):

http://www.xbitlabs.com/articles/other/display/response-compensation.html
http://www.behardware.com/articles/...ds-overdrive-contrast-and-viewing-angles.html

Here is a review of the dell 2405 (and a couple other 24" monitors) and it talks about the overdrive used in the 2405 panel. Interesting quote from the review: "In the end the Samsung overdrive has nothing but downsides. Response time is reduced and maybe that is a good thing for characteristics and sales, but the reactivity has not changed one whit, and the video quality is awful.":

http://www.behardware.com/articles/567-2/23-and-24-lcd-monitors-roundup.html
 
I believe both the 2405 and the samsung 244t use the LTM240M1 panel.

The listing of the new 24" panel on samsungs site (LTM240M2) is interesting. Only difference in specs seems to be that it is S-PVA instead of just PVA. Strange they didn't base the 244t on that one, unless it is just that new. Maybe that could be the panel the 2407 will be using.

If anyone has a samsung 214t to run the clone test against I would be very interested - It uses an S-PVA panel (LTM213U6). I think that is about my last hope on available lcds until the next generation comes around.
 
Hmm just dug up another interesting puzzle piece. Guess what signal processor the Dell 2001FP uses? The Genesis gm1601. Another point of interest is this monitor doesn't even use a Samsung panel (which seemed to be the common denominator), it uses the LG.Philips LCD LM201U04. So it's looking like the gm1601 could be a major player in this.

http://www.anandtech.com/printarticle.aspx?i=1918

I'm going to see if I can find if the gm1601 is the processor in the samsung 244t or the LN-R238W.
 
Great stuff Tasc, thanks! I'm leaning toward the gm1601 as the culprit too.

You mention the 244T behaves the exact same way. Does anyone know what DSP the 244T has?

Navy
 
That thread mentions the 2005fpw allegedly has the gm1601. Anyone with a 2005 able to do the stopwatch cloned monitor test for us?

Navy
 
the 2405 and 244t definently do not have the same panel. I have seen them side by side and used both of them. From my experience the Samsung has more input lag, less white ghosting and more motion blurring than the Dell. The Dell has massive white ghosting, not alot of motion blurring and some input lag. the Dell is also a much warmer toned panel than the samsung.

Those are just my opinions though.
 
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