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Hi,
there is something I have been really wondering about lately, and that is wether the HD's touch screen is multi touch capable by hardware, e.g. the hardware is able to identify several touches at the same time.
Now, if you do the following test, start Notes, and press two fingers at the same time on the screen (writing a note with touch). You will notice that the line is drawn in the middle between your fingers. I then started to think that if the screen isn't mulitouch capable by hardware, the point/line would either choose one finger and stick to that, or jump between those two fingers, not draw a point perfectly in between of those two. As it looks now, it seems that the point that is sent with the mouse click event, is a calculated point based on your fingers(1). A calculation that might have been done in the touch driver.
Now there might also exist another reasonable explanation to this, and that is when you press several fingers you press down a larger area of the screen at the same time(2). The point is then calculated to the center of this area. However, this does not realy fit in with the technical design of a resistive touch screen.
I have tried to explain in figures, look at the attachements.
Now, if scenario 1 should be the case, then there might be a chance to reverse engieneer the touch driver and create a multi touch capable phone right?
If anyone have more understanding on this field, please correct me. Maybe I can get some sleep after all.
Sorry for any typos, it's early in the morning..
Get no sleep...
skov82 said:
Hi,
there is something I have been really wondering about lately, and that is wether the HD's touch screen is multi touch capable by hardware, e.g. the hardware is able to identify several touches at the same time.
Now, if you do the following test, start Notes, and press two fingers at the same time on the screen (writing a note with touch). You will notice that the line is drawn in the middle between your fingers. I then started to think that if the screen isn't mulitouch capable by hardware, the point/line would either choose one finger and stick to that, or jump between those two fingers, not draw a point perfectly in between of those two. As it looks now, it seems that the point that is sent with the mouse click event, is a calculated point based on your fingers(1). A calculation that might have been done in the touch driver.
Now there might also exist another reasonable explanation to this, and that is when you press several fingers you press down a larger area of the screen at the same time(2). The point is then calculated to the center of this area. However, this does not realy fit in with the technical design of a resistive touch screen.
I have tried to explain in figures, look at the attachements.
Now, if scenario 1 should be the case, then there might be a chance to reverse engieneer the touch driver and create a multi touch capable phone right?
If anyone have more understanding on this field, please correct me. Maybe I can get some sleep after all.
Sorry for any typos, it's early in the morning..
Click to expand...
Click to collapse
I have a QVGA Titan and have noticed the same thing.
Also, say on TF3D hold down your finger on the home tab and then put another finger on the tab on the other side of the screen while still holding the home tab and it will go to the tab between them. Also if you slowly release one of the fingers it will cycle through the tabs....
dwizzy130
I've got my HTC magic last week and order a stylus pen to use with it. The problem is that the phone only respond to finger tap, and I must be holding it. If it is, for example, on the car support and I tap it with my finger it does not respond to touch. Does anyone else have this problem?
Thank you!
The HTC Magic has a captive touch screen, these types of touchscreens only work to the touch of the finger and hence will not work with a stylus.
I also have this problem, not that with the stylus ( I know it can´t be used with stylus). When laying the phone on a tabele an using with only my fingers the respons is very bad. When holding the phone in my hand it´s perfect.
Anyone knows why???
Instead of tapping the screen try a light press, it does not respond to a tap or quick jab with the finger. Go Here and you can read how the Capacitive Touchscreen works.
Clinton
Best thing that i've found to do, is make a circuit with the phone:
When its flat or in car holder if you make your thumb touch the bottom of the phone (near the roller ball) then use your finger to do the action required this seems to work!
Don't know why, but it does!
If anyone noticed, if you hold your Magic in one hand and use the other hand to point etc, the sensitivity sort of goes down.
Using the fingers (or rather thumb) of the same hand in which you hold your Magic would produce an insanely much better result!
atan.ismail said:
If anyone noticed, if you hold your Magic in one hand and use the other hand to point etc, the sensitivity sort of goes down.
Using the fingers (or rather thumb) of the same hand in which you hold your Magic would produce an insanely much better result!
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That's due to the orientation of your fingers. Again, it's due to the capacitive screen. Using your thumb on the same hand that's holding the phone, you have more surface area touching on the screen where as if you "point" with the finger (I'm presuming your index) with the empty hand, the surface area is less. You can do a simple test. Press the screen like you were pointing at it then do the same but this time, press it like you were giving your finger print but not as wide.
Hi there!
I'm having issues while coding for my Evo. While touching the screen, the Evo interprets me touching the buttons as another press on the screen instead of a onKeyDown, onBackPressed, etc. (It actually sets the MotionEvent pointer count to 2, and I can get the co-ords that I'm touching that are off the main screen, for example, 830*190 when touching the back button.)
Short of coding in the locations of the buttons (which would be different for every phone with capacitive buttons, if they all have the same issue), is there any way to get around this? Does anyone else have this issue with a different capacitive buttoned device?
The nexus has the same problem. It seems that the buttons are a extension of the actual screen. Multitouch doesn't support more than 2 touches on HTC phones. And even that is problematic because the phone registers actualy one big touch and determines the fluctuations in its size. So if you want to pinch to zoom for example the phone will compare the size of the touch between your fingers. Basically you've got a hardware limitation and there's nothing you can do about it.
Sent from my HTC Desire using XDA App
Is anyone else having problems with their touch screen?
It will occasionally become unresponsive, and other times will just start 'clicking' repeatedly in random spots.
I find myself having to turn the power off and on (via the button, not a hard power cycle) to fix the issue. Its starting to get annoying.
Anyone else?
Yes, I am getting the same thing but I've found that if I just turn the screen off and then back on it fixes the problem. I don't need to reboot.
You think this would warrant an exchange? or is it just how its going to be?
I've put several hours on mine, but haven't experienced this issue. I don't know, if this happened to me more than once, I probably would exchange it.
It was happening to me all the time. I had to get a screen protector and haven't happened since.
ryoojin83 said:
Is anyone else having problems with their touch screen?
It will occasionally become unresponsive, and other times will just start 'clicking' repeatedly in random spots.
I find myself having to turn the power off and on (via the button, not a hard power cycle) to fix the issue. Its starting to get annoying.
Anyone else?
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Click to collapse
gigadigit said:
It was happening to me all the time. I had to get a screen protector and haven't happened since.
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Very good "solution" to what should be an obvious problem. The Nook Color has a *capacitive* touch-screen. If you get "junk/gunk" on the screen, it's gonna cause you issues. I find this to be the case while holding my NC and playing Flight Director for a while. The issue: My hands become sweaty and as a result of the slight film of sweat/oil on the screen, the NC's ability to measure the capacitive changes on the screen (and react appropriately to them) is compromised.
Keep your screen clean and you won't have this issue.
Note: after you wipe the screen down (damp cloth, etc), you will need to click the power button and go the lock screen and then back into the NC before it works right directly after cleaning the screen. The dampness of the cleaning cloth throws up the calibration enough to cause very strange things. My experience with "correcting" this issue tells me that in some way, the NC is recalibrating itself when you go to the lock screen.
johnopsec, this has been my experience as well. After cleaning the screen from finger-jam i don't get the phantom clicks. I also noticed that because I live in a very humid climate (Florida panhandle) there will be a thin moisture layer buildup sometimes and it really helps to wipe this off. I also have an incredible that does not have this problem but it has a screen protector which, I am guessing (and as gigadigit expressed), fixes the problem. Just make sure the screen is clean and dry before applying!
screen response
Also,
If you are holding the side of the case by the screen this throws off the touchscreen, I was having the issue where it would be clicking and multiple letter inputs when typing.
Also when it is laying flat and you have the power cord plugged in you may get multi letter inputs.
The trick, hold it by the back not the sides.
and if you have it plugged in and need to type don't leave it laying flat.
I have experienced this problem and loosely seen it correlated with moist fingers.
no moist fingers here and on my 2nd nc. this ones starting to have the ghost touches too.
My Nook Color started acting up after paying levels 3-4 to 3-6 of Angry Birds. I'm not sure if Angry Birds caused the issue or not as I haven't gotten it to do it in another app. I'm running 1.4.2. Doing a lock and unlock fixes the problem until it returns.
I managed to get Phone Tester to run after it got into this state. I made a video of it using a crappy webcam. There's a stuck finger in the corner.
youtube.com/watch?v=OdcVG-Q8LS4
Touch Screen issues while unit is plugged in..
It seems I have read on some forums that some people have screen issues.
Personally I didn't experience this until I tried to use my NC while plugged into it's wall charger.. It seems to act as if it has a grounding issue, which is not the case when the unit is unplugged.
So when you are running your multitouch or touch tests, do it without the unit plugged in..
-CC
I have had the same problem with my touch screen. I have the nexus live wallpaper and whenever you touch the screen it sends off the animation. Well sometimes it just goes non stop and sometimes opens up the window where you can apply a widget. I guess the most practical solution would be a screen protector but if not ill restore it and send it off to B&N
There's a small little app in the market named "Nook Screen Recalibrate" this app is super simple and easy to use. I hope this helps
https://market.android.com/details?id=com.assid.android.nookrecalibrate&feature=search_result
Here is the issue I have...
Right is the N button side. Just a reference point for this.
Reboot the Nook (I use CM7).
Bring up the keyboard
Touch Q in the center - you get W.
Touch Q on the right - you get W
Touch Q on the left - might get Q but you usually get W.
Recalibrate using the Nook Screen Calibration (above).
Q now gives Q unless you press on the right side of the key. I also notice I still have to hit the back arrow more to the left or I bring up the keyboard.
I've learned to live with it, but the left side of the touchscreen is slightly off and you have to touch to the left side of any object on the last 1".
Awats said:
Here is the issue I have...
Reboot the Nook (I use CM7).
Bring up the keyboard
Touch Q in the center - you get W.
Touch Q on the right - you get W
Touch Q on the left - might get Q but you usually get W.
Recalibrate using the Nook Screen Calibration (above).
Q now gives Q unless you press on the right side of the key. I also notice I still have to hit the back arrow more to the left or I bring up the keyboard.
I've learned to live with it, but the left side of the touchscreen is slightly off and you have to touch to the left side of any object on the last 1".
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yeah, for me it's the edge of the screen along the right side. it's less sensitive then the rest of the screen. I found that calibrating 2-3 times really works best.
There's also a fix in the nookwiki, but i can't get my adb to work on my laptop, I think its the drivers.
http://nookdevs.com/Recalibrate_the_NookColor_touch_screen
What is the left and right side?
I should have said that left is the side opposite the N button.
I downloaded Multi-Touch Screen from the market and I can see part of the problem is the angle of my finger. Straight on it's better.
Nook Color Touch Screen Problem
Having similar problem as described, after two years. Extended warranty expired ... two weeks ago (of course).
Tried cleaning screen, no help. Have not tried screen saver yet, but will.
In the meantime, I notice the comments about touching the sides, and I noted that as well.
Is it possible that this could be helped by opening it up and re-seating the case? Has anybody tried this?
Anyone feel the same with their GT10.1? I feel like sometimes I really need to press on an icon to make it launch or swipe really hard to get it to move.
Is there a way to increase the sensitivity? Anyone else notice this too?
It's not a huge problem just a minor annoyance. It just doesn't seem snappy.
I've noticed that about mine too. Nothing major but an annoyance nonetheless.
Sent from my GT-P7510 using XDA Premium App
When I tried the Asus Transformer that's what I found, needed more pressure than I expected for it to register. My 10.1 seems fine, responds to very light touches nicely.
Is there a calibration setting somewhere?
I find myself hitting everything twice. First time it doesn't register, next time I push harder. My XOOM screen is more sensitive. Guess I'm too used to that. This effects swiping in the browser too. Its hard to push gently to move a page up and down. I have to push harder and then every once in a while the page ends up scrolling at high speed all the way to the top or bottom.
It seems to me that I just need to get used to using the larger capacitive touch screen. When first using a smaller touch screen everyone begins to realize what part of their finger is actually touching the screen. I don't know if the screen is any more or less sensitive but I've been getting better at using this larger screen and noticing which part of my finger actually making contact and where.
Ill tell you 1 thing for sure, this thumb keyboard is amazing! I think I might actually like it better than swype! You can really type quick and the auto correct works very Well!
Sent from my Samsung Galaxy Tab 10.1.
Here is some evidence that the sensitivity problems with the screen may be hardware/software related.
After a hard reset the screen appears to be very sensitive.
After an hour screen sensitivity seems to drop.
BUT there is something else going on - at the same time, after a hard reset my Targus capacitive stylus works normally on the Tabs screen.
At the time when the screen sensitivity seems to drop, the Targus stylus stops working. It can no longer be used to swipe the screen or scroll the browser. Finger swipe and scroll still works however.
Now why would the Targus stylus suddenly stop working, unless there is a real change in the capacitive sensitivity of the TAB 10.1 screen such that it falls below the threshold necessary to operate/detect the stylus?
The touchscreen on the Tab 10.1 definitely isn't as accurate or sensitive as the Xoom. I had both side by side for a few days before I returned my Xoom and you can definitely tell the difference.
However, I'll take the Galaxy's screen over the Xoom just from a contrast/color reproduction standpoint, so I guess there are pluses and minuses to everything.
Sent from my GT-P7510 using XDA Premium App
Apparently Tegra 2 is not able to cope with all of the open tasks,live widgets,and have enough power left to make the immediate switch to a larger screem's touch commands.
hagba said:
Apparently Tegra 2 is not able to cope with all of the open tasks,live widgets,and have enough power left to make the immediate switch to a larger screem's touch commands.
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I have a XOOM as well, and it handles multitasking just fine. There is no hesitation or lack of screen sensitivity at all. I pulled it out this morning and was amazed at how much smoother the user experience is. You tap once - the screen responds - on my GTAB 10.1 I have to conciously think about every click and half the time I still have to do it twice.