Ok, some people were confused as to what my problem was with my other post, They thought it was a performance lag issue; possibly due to low memory. So I am reposting, I am also making it a poll, as some mentioned that a downgrade fixed this behavior on there units.
I have noticed my touch screen does not have smooth response in apps. To confirm I downloaded a app that tests mulitouch; I used "multitouch vis test".
When moving my finger quickly, or swiping, the finger tracking of the touchscreen seems fine. The problem arises when moving slowly or making small movements of less than 10 pixels; that is when you can see that the touchscreen does not track smoothly. You can see the output on the screen stay in one position as you slowly move your finger, then suddenly jump several pixels. It repeats this process as you continue to move slowly, often times the output on the screen is still lagging behind your finger. (it is not centered under your finger even after the jump) This happens even on a fresh boot, and I have tried the touchscreen calibration several times.
Overall it seems like the touch detection is low resolution, and can not detect fine/small movements. If the ones claiming it is dependent on firmware version are correct, then this could be fixed by Archos. If I get enough responses to the poll, I will contact Archos if the results point in that direction. If this is a fairly rare issue, then I know my A70 is defective.
Edit: From the responses here, it seems that the display can detect point touch to a very fine degree. The problem is that the movement detection algorithm is low resolution; the device has to detect movement of several pixels before outputting that movement. That means it can be fixed within software. (unless it is built into the touch screen controller chip)
I run calbrate touch screen and it`s now Ok.
Did you try this?
ncuxxx said:
I run calbrate touch screen and it`s now Ok.
Did you try this?
Click to expand...
Click to collapse
Yes, several times.
Those claiming not to have this issue are ahead, but the sample size is too low.
Can you edit the polls for A101's and A70's separate?
marclh1992 said:
Can you edit the polls for A101's and A70's separate?
Click to expand...
Click to collapse
Polls can not be edited, but this is for A70 only. You having issues with the 101?
Hi all,
I don't know if this is of any relevance to the problems you guys are experiencing, but I thought the screen of my 101 was broken.
The problem was, me coming from a different china tablet with resistive screen, that I was applying far too much pressure to the screen and capacitive screens don't respond well to that.
These screens need almost feather light touch and are very, very responsive and the tracking (at least on my 101) is excellent.
I hope this helps...
I'm not sure you can accurately conclude that the touch response is low resolution for slow finger motion with the test scenario you are using. I say this not based on some intimate knowledge of Android touchscreen drivers, but on years of experience programming human interfaces at a low level for embedded systems. From using my Archos 101 and a Zenithink ZT-180 (Android 2.1 tablet), the touch response feels similar to how some mice (mouses?) interfaces might be programmed, but tweaked to compensate for the vagaries of using a fat index finger that lays over many pixels at once pretending to be a pressure sensitive mouse cursor. I can imagine the touch interface having to pay attention to how many pixels are being touched by your finger and how many of those pixels at the edges are noisily changing from inactive to active touch-wise. It's actually very impressive how intuitive it feels to use a good touch interface when I know how much logic is required to say this is a touch and hold verses a hard quick tap verses a small swipe verses whatever. As in mouse programming, there are logic thresholds based on how fast the cursor is moving and how quickly it's accelerating. It could very well be that your A70 may not have all the speed and acceleration thresholds set optimally, or to your tastes. I am only suggesting you keep an open mind and dig deeper to learn how these things work.
Bye.
Marine6680 said:
Ok, some people were confused as to what my problem was with my other post, They thought it was a performance lag issue; possibly due to low memory. So I am reposting, I am also making it a poll, as some mentioned that a downgrade fixed this behavior on there units.
I have noticed my touch screen does not have smooth response in apps. To confirm I downloaded a app that tests mulitouch; I used "multitouch vis test".
When moving my finger quickly, or swiping, the finger tracking of the touchscreen seems fine. The problem arises when moving slowly or making small movements of less than 10 pixels; that is when you can see that the touchscreen does not track smoothly. You can see the output on the screen stay in one position as you slowly move your finger, then suddenly jump several pixels. It repeats this process as you continue to move slowly, often times the output on the screen is still lagging behind your finger. (it is not centered under your finger even after the jump) This happens even on a fresh boot, and I have tried the touchscreen calibration several times.
Overall it seems like the touch detection is low resolution, and can not detect fine/small movements. If the ones claiming it is dependent on firmware version are correct, then this could be fixed by Archos. If I get enough responses to the poll, I will contact Archos if the results point in that direction. If this is a fairly rare issue, then I know my A70 is defective.
Click to expand...
Click to collapse
I'm not saying the hardware is low quality, and it could be software setup. I know a good deal about how these things work, or at least have the ability to understand the technical side. I am an avionics Tech by trade.
When testing the slow pixel to pixel fine movement adjustment, I do not slide my finger, I roll my finger on the screen. This allows smoother and more precise small movements. It is a technique I have used on other devices that works very well.
The issue, is that my phone and 10in tablet (non Archos) does not behave this way. It is a usability issue. When playing a game like Angry Birds, how precise you can aim is the difference between beating the level and failure.
CrunchyDoodle said:
I'm not sure you can accurately conclude that the touch response is low resolution for slow finger motion with the test scenario you are using. I say this not based on some intimate knowledge of Android touchscreen drivers, but on years of experience programming human interfaces at a low level for embedded systems. From using my Archos 101 and a Zenithink ZT-180 (Android 2.1 tablet), the touch response feels similar to how some mice (mouses?) interfaces might be programmed, but tweaked to compensate for the vagaries of using a fat index finger that lays over many pixels at once pretending to be a pressure sensitive mouse cursor. I can imagine the touch interface having to pay attention to how many pixels are being touched by your finger and how many of those pixels at the edges are noisily changing from inactive to active touch-wise. It's actually very impressive how intuitive it feels to use a good touch interface when I know how much logic is required to say this is a touch and hold verses a hard quick tap verses a small swipe verses whatever. As in mouse programming, there are logic thresholds based on how fast the cursor is moving and how quickly it's accelerating. It could very well be that your A70 may not have all the speed and acceleration thresholds set optimally, or to your tastes. I am only suggesting you keep an open mind and dig deeper to learn how these things work.
Bye.
Click to expand...
Click to collapse
I have noticed this issue too, with "multitouch vis test" When i move my fingers over the screen slowly it jumps at least 4 Pixels.
But the screen has not a low resolution, when i lift my finger up and place it down again, i can "select" for example 412 then 411.
I have the archos 70 it
Schroedinger
Edit:
When i use this program on my Desire HD, ich can slide from Pixel to Pixel by rolling my finger.
schroedinger said:
I have noticed this issue too, with "multitouch vis test" When i move my fingers over the screen slowly it jumps at least 4 Pixels.
But the screen has not a low resolution, when i lift my finger up and place it down again, i can "select" for example 412 then 411.
I have the archos 70 it
Schroedinger
Edit:
When i use this program on my Desire HD, ich can slide from Pixel to Pixel by rolling my finger.
Click to expand...
Click to collapse
Definitely the software movement detection algorithms then.
If we get some more votes on here, I am going to point Archos in this direction.
hardware or software problem...???
I have already contacted Archos support about this. They just told me they've never heard of this problem... I responded back with more detailed info and they have just ignored me.
I have also posted info on this on archosfans.com forum. There doesn't appear to be many people who care, or have this problem. I am trying to find out if there is defective hardware which means I need to get it replaced BEFORE I void the warranty with the developer firmware, or if it is expected because of software optimization that will be fixed.
http: forum.archosfans.com/viewtopic.php?f=73&t=48651
video:
http: www youtube.com/watch?v=zdH_Kg4-xTQ
Can a few people please try using Multitouch Visual Test and post results? I am wondering if any A70IT, or any other Gen 8 touch screen actually works properly. I am wondering if anyone has a an A70IT that actually picks up every pixel like it should...
If you don't have access to get it from the market (it is not in AppsLib), I am posting a link to the apk to download. It is just a development tool, so I am sure it is ok.
http: www megaupload.com/?d=PN7DVJZ2
that poll is completely unscientific
don't care about the poll
I don't really care about the poll. I have this issue and trying to figure out if anyone else has it or if I have a defective device that should be replaced. This was the only thread I could that related to my problem, and the original post explained it perfectly.
Should I start a new thread about this problem rather than a reply to this poll?
Coordinates seems to increment/decrement approx +- 5 only. Slow movements are delayed somehow. Not really a big problem, but if it is a software issue I would really like to see some improvements in the future.
It isn't scientific, but if a lot of people had participated, it would have been a good guide.
It is rather annoying, but no point in replacing it if it is a common issue with every tablet.
Marine6680,
Exactly my point. I don't want to waste my time in trying to replace something that might not be broken (in a matter of speaking).
Hello XDA,
I've searched around for this problem a bit, and it seems this issue hasn't been brought up anywhere. If it has, then I apologize.
The S2 has an awesome display with great colors, blacks included, but I noticed this issue one night when I was watching a film on my S2. When the display is showing black/dark images you can clearly see what appears to be glue smudges all over the screen, especially along the rims. It is only noticeable when there's little to no other light in the surrounding environement. Increasing brightness seem to worsen the problem.
It is hard to describe and very difficult to capture on camera but I made an attempt. I can't post links yet it seems but here's an imageshack url:
img842.imageshack.us/img842/5420/blotches.jpg
The image was taken with a Canon 450D with 20 sec exposure (hard to focus when it's that dark I'll tell you). Edited slightly in photoshop to cut down the size.
Here you can see the general color of the screen (gray-ish) and some of the blotches of (what I'm guessing is) glue in the back. If I had to guess I suspect the blotches might come from the capacitive touch layer of the screen. Is this an issue or is it to be expected on phones like these? It's not a major problem but it's actually quite annoying when you're watching a film/youtube clip/playing a generally dark game or whatever. Should I return my device? I've used it for just about a week and a half.
Thanks in advance for any help.
i have this too, its the AMOLED display. you can turn the screen off and on and you'll see it go off n on. not the sgs, but amoleds generally. my omnia HD had this too (1st gen AMOLED)
the blacks are not 100% black i say
Im having this too, nothing to worry about this as it doesnt disturb the beautiful display of this mobile.
Love the tab but have little issue .
The screen resolution does not play well with my 4 eyes . I tried density changer and absolute system tools to tinker with everything but it still weird to me . My brothers I pad has 1024x768 and I can stare at it all day without my eyes getting tired . How could I change resolution to 1024x768 ??????????????
You can't. The only thing you can do is have the device rescale everything to draw 1024 dots across the display, 768 down. The result... no. Try changing your favorite PC to 1024x768 on a 1280x1024 display, with scaling enabled. It's horrible.
There are font options you can mess with. Haven't done so myself, but there's threads around here that mention it. Also look at the Accessibility features in Settings.
Do pay a visit an optometrist and bring the tablet with you. If you're having contrast issues with the display, there may be something else going on that needs attention. Perhaps he'll just congratulate you for hitting 40 or something, who knows - or maybe you're about to fail that stupid puff test and your own pixels are dying. A good friend of mine lost 70% of his vision in 3 months due to that stuff, because he waited. Don't make that error.
Good luck,
-sbb
1. The 4 dock icons at the bottom, thought they looked a little stretched vertically. The kind when the resolution is slightly incompatible with the the screen...
2. The display looked darker than usual. The brightness was max, but still looked a little less brighter than my HD7...
With your RaZrs, do you guys think so...
ALso, is there a way we can set the resolution and the brightness...there is an auto and there is manual right?
I saw it had something called 'Ambient lights' i display setting...
OK, I have seen several threads here, concerning image retention problem, sometimes marked as screen burn. So I thought we could collapse into one general thread on this subject.
So, LCD screen does not have image burn problems. Image burn is name for persistent effect. What we have with our Primes is image retention. This effect is caused becouse liquid crystals in LCD gets used to its certain possition...
For example, if you have some bright background, and you leave it unchanged for about 10-15 minutes, than run some grey screen picture, you will see "ghost" of the background image in the app.
This effect can be seen in many screen technologies. S-IPS and AMOLED are widely used ones on tablets and mobile devices. They both suffer from this effect.
There is actualy big chance you won´t even notice that. Prime turns it screen off after some time, and when you use your device you are probably actually doing something, meaning you are dynamically changing the screen, so image retention has no time to take place.
In everyday use, problems could occur when you use SW keyboard for a long time, or for example game menu controls, etc.
The most important thing is, this is NOT PERSISTENT. Image retention of this type should dissapear after while, you can speed it up by either turning screen off or displaying plain white image for a while.
I believe none of our tablet displays are immune to this. In fact, even glory iPad 1&2 displays are not immune. Neither was my HTC Diamond screen. (Yes, pretty old, but it has nice VGA screen). Sometimes I get navigation cursors retained after reset, even for few minutes (on my HTC Diamond)... So I believe we just need to live with this effect. Most of the time, you won´t even notice it.
But we can share our experience. I have not notice any image retention untill today, when I needed to discharge my Prime more quickly, so I maxed brighteness (IPS+ on) and leave it in home screen on for about 15 minutes. Than I started YouTube app, and on its grey load screen, I clearly seen ghost of my homescreen background. I immediatelly retried lauchning YouTube app, but it was all gone. If curious, or if you want to replicate this, my homescreen image is the default with tree, most yellow-ish like I believe autumn sunset version
pokevitek said:
so I maxed brighteness (IPS+ on) and leave it in home screen on for about 15 minutes
Click to expand...
Click to collapse
Think that is the root of your ghosting issue there, would not call that normal operation at all to leave it maxed out for 15mins. The display is super bright and I dont think even outdoors you need max IPS+ to adequately use the tab.
Well, if I am right, it sould have nothing to do with brighteness level. Like I said, it is different effect, it is not burned. But maye thrucomming light intensity has some effect on the crystal polarisation...
Thanks for the post, I get this effect with my Nexus One as well. The notification bar from having the phone in portrait mode shows itself at times in landscape.
Sent from my Nexus One using Tapatalk
Actually LCD panels can get screen burn, I have had two LCD HDTV s that had it. But those were first gen LCD HDTV s.
You shouldn't see anything like it on LCD screens of today. If what your saying is true then why isn't the status bar in ICS (or honeycomb) ghosting for everyone?
I've done some tests recently after finding this issue on my Galaxy Tab 7.0 Plus. It was VERY dramatic on that tab. Only a few seconds on one screen, change to a screen that is mostly gray and the image persistence was there for quite a while. And it was a strong persistence. Not just a faint image. You could easily read text and see images. The pictures in the following thread show it.
http://forum.xda-developers.com/showthread.php?t=1437445
But after having this issue, I ended up testing some other tabs I have. I've seen the issue on my Kindle Fire's (I have 3 of them). I have a Lenovo Thinkpad Tablet and have not seen the issue there. I also have a Transformer Prime and I do see it faintly on the prime, generally on the right side of the tab when holding in landscape (with power button on top). I also see it sometimes on my 30" Dell IPS monitor.
I guess the point is, it is more common than you think. But some screens may exhibit the problem more than others. That Galaxy Tab 7.0 Plus (that specific one) exhibited it far worse than anything else I've seen.
I've decided not to worry about it. If it's happening to yours and it happens very quickly and doesn't go away quickly, perhaps your display is worse than the norm. But I would expect all of these displays to show some level of image persistence. Return it if it bugs you, but accept the fact that they all may have this issue to some degree.
Thanks to the OP for this post.