Related
A capacitive touchscreen panel is coated with a material, typically indium tin oxide that conducts a continuous electrical current across the sensor. The sensor therefore exhibits a precisely controlled field of stored electrons in both the horizontal and vertical axes - it achieves capacitance. The human body is also an electrical device which has stored electrons and therefore also exhibits capacitance. When the sensor's 'normal' capacitance field (its reference state) is altered by another capacitance field, i.e., someone's finger, electronic circuits located at each corner of the panel measure the resultant 'distortion' in the sine wave characteristics of the reference field and sends the information about the event to the controller for mathematical processing. Capacitive sensors can either be touched with a bare finger or with a conductive device being held by a bare hand. Capacitive touchscreens are not affected by outside elements and have high clarity. The Apple iPhone is an example of a product that uses capacitance touchscreen technology: the iPhone is further capable of multi-touch sensing.
Capacitive sensors work based on proximity, and do not have to be directly touched to be triggered. In most cases, direct contact to a conductive metal surface does not occur and the conductive sensor is separated from the user's body by an insulating glass or plastic layer. Devices with capacitive buttons intended to be touched by a finger can often be triggered by quickly waving the palm of the hand close to the surface without touching.
The HTC/T-Mobile G1/Dream is also equipped with a capacitive touch screen.
is the Xperia X1 also equipped with Capacitive touch screen? because i noticed its not as sensitive as iphone
Without opening up the phone, there are several ways to find out if a phone uses a capacitive or resistive (i.e. pressure-sensitive) screen.
1. Look at the screen off-angle in bright light. You may be able to see a grid of dots that looks something like this and extends over the entire screen surface:
. . .
. . .
. . .
If you can, it's probably not a capacitive screen.
2. Can the screen be operated by a non-conductive object i.e. a toothpick?
If so, it's probably not a capacitive screen.
3. Does the device come with a stylus/"plectrum" and does it require screen calibration?
If it does, it's probably not a capacitive screen.
No mass-market WM device to date has a capacitive touchscreen, including the X1. The first post of this thread will help you understand why: http://discuss.pocketnow.com/showthread.php?threadid=23389
Nocturnal310 said:
is the Xperia X1 also equipped with Capacitive touch screen? because i noticed its not as sensitive as iphone
Click to expand...
Click to collapse
My Xperia is more sensitive than an iPhone. Granted I did some tweaking, but still.
No, Xperia is like the rest of our phones has resistive screen. It can be very sensitive, but stylus will be your main indication. I have LG Prada that has capacitive screen and LG Viewty that has a resistive one.
enigma1nz said:
No, Xperia is like the rest of our phones has resistive screen. It can be very sensitive, but stylus will be your main indication. I have LG Prada that has capacitive screen and LG Viewty that has a resistive one.
Click to expand...
Click to collapse
No? So, you have spied on me using my phone and know that it is not more sensitive? Pffft...
iphone rockz!
im sorry but no phone is as sensitive as an iphone!
jesse_g said:
im sorry but no phone is as sensitive as an iphone!
Click to expand...
Click to collapse
You should be sorry, because you are wrong. Do your research better and come back to apologize.
sorry but i have the same idea...... i think iPhone is more sensitive than xperia
Do capacititve screens have a separation issue like some of the HTC resistive screens have?
Where the layers of a resistive screen including the digitizer start to separate causing a rectangular shape in the center that looks like oil on water.
Has happened to me and many others where the screen eventually has a complete failure.
I do know that the capacitive screens on the iPhone are prone to breakage due to the fact that it has a glass surface.
The resistive screen of the Diamond is less prone to breakage because it has a plastic type film on the surface.
Btw, my screen is pretty sensitive, whether using the stylus or touch.
You can tweak your resistiv screen by allign screen.
If you dont press the screen and move little circles between the arrow you can make screen more sensitiv
Sorry for my english cause i am german
Black93300ZX said:
A capacitive touchscreen panel is coated with a material, typically indium tin oxide that conducts a continuous electrical current across the sensor. The sensor therefore exhibits a precisely controlled field of stored electrons in both the horizontal and vertical axes - it achieves capacitance. The human body is also an electrical device which has stored electrons and therefore also exhibits capacitance. When the sensor's 'normal' capacitance field (its reference state) is altered by another capacitance field, i.e., someone's finger, electronic circuits located at each corner of the panel measure the resultant 'distortion' in the sine wave characteristics of the reference field and sends the information about the event to the controller for mathematical processing. Capacitive sensors can either be touched with a bare finger or with a conductive device being held by a bare hand. Capacitive touchscreens are not affected by outside elements and have high clarity. The Apple iPhone is an example of a product that uses capacitance touchscreen technology: the iPhone is further capable of multi-touch sensing.
Capacitive sensors work based on proximity, and do not have to be directly touched to be triggered. In most cases, direct contact to a conductive metal surface does not occur and the conductive sensor is separated from the user's body by an insulating glass or plastic layer. Devices with capacitive buttons intended to be touched by a finger can often be triggered by quickly waving the palm of the hand close to the surface without touching.
The HTC/T-Mobile G1/Dream is also equipped with a capacitive touch screen.
Click to expand...
Click to collapse
interesting... I didn't know that
jesse_g said:
im sorry but no phone is as sensitive as an iphone!
Click to expand...
Click to collapse
darren shan said:
sorry but i have the same idea...... i think iPhone is more sensitive than xperia
Click to expand...
Click to collapse
Hey guys there is a cab called iTouch for blackstone and it tweaks the resistance to ultra-sensitive, works like a charm. http://forum.xda-developers.com/showthread.php?t=469865 , try it.
1. Look at the screen off-angle in bright light. You may be able to see a grid of dots that looks something like this and extends over the entire screen surface:
. . .
. . .
. . .
If you can, it's probably not a capacitive screen.
Not necessarily true. The Nexus One has a capacitive screen and also has the dots...
Sent from my Nexus One using XDA App
Multi-touch
So.. I guess I'm going to show my ignorance, but here is my question.
There are several posts on several sites talking about how you can't do multi-touch unless you have a capacitive screen. Then I go to Pandawill and look at the G10. It says it's a resistive screen but there are videos of it doing pinch-to-zoom.
Can someone help me understand how multi-touch relates to the screen type?
Sorry if i'm too much of a n00b
Sorry to add fuel to fire but a capacitive screen will always be more sensitive (speaking purely about the physics of it) than a resisitive screen.
Why?
Capacitive screens rely on charge and comparative charge of two bodies. In some instances, capacitive screens can work without the finger actually touching the screen.
Resistive screens rely on a minute deflection from contact to connect two conductive layers. You can touch a resistive screen lightly enough to not result in a UI interaction. Resisitve screens can be tweaked to work at a very high sensitivity but still not as sensitive as a capacitive screen.
Go ahead, compare two phones with opposing screen tech side by side. I thought nothing could be as responsive as my Topaz till I bought a Nexus, then Desire (which have other issues btw! )
Sorry but thats the blunt science behind it. Bear in mind the perception of responsiveness to touch can very well depend on the quality/smoothness of the software written or the user interface.
Source:
HTC Touch Diamond 2 vs. HTC Desire
Source 2:
My university degree.
Sorry for the double post but to answer your question,
Yes resistive screens can be used to provide multi touch support. Where this support isnt built into the drivers for the digitizer, its a lot harder. Bear in mind most older phones were launched before the mainstream advent of multi touch. Thus no drivers...only brilliant minds at XDA
However, using a resisitve touch screen to provide multi touch has some serious drawbacks, mainly on smaller screens.
I hate to break it to you but the reason behind this is actually the size of your "pinch" fingers with respect to screen size.
Multi touch on a small resistive screen cause deflection at multiple points on the digitizer but due to the reliance on deflection, the software will inevitably struggle to understand what sort of multitouch gesture you're trying to do! Your fingers with relation to screen size are simply too big!
When you have a bigger screen or a well designed digitizer + software, it can determine positions of multiple points much more accurately, thus allowing multi-touch.
eulalie said:
So.. I guess I'm going to show my ignorance, but here is my question.
There are several posts on several sites talking about how you can't do multi-touch unless you have a capacitive screen. Then I go to Pandawill and look at the G10. It says it's a resistive screen but there are videos of it doing pinch-to-zoom.
Can someone help me understand how multi-touch relates to the screen type?
Sorry if i'm too much of a n00b
Click to expand...
Click to collapse
ozy944 said:
Sorry for the double post but to answer your question,
Yes resistive screens can be used to provide multi touch support. Where this support isnt built into the drivers for the digitizer, its a lot harder. Bear in mind most older phones were launched before the mainstream advent of multi touch. Thus no drivers...only brilliant minds at XDA
However, using a resisitve touch screen to provide multi touch has some serious drawbacks, mainly on smaller screens.
I hate to break it to you but the reason behind this is actually the size of your "pinch" fingers with respect to screen size.
Multi touch on a small resistive screen cause deflection at multiple points on the digitizer but due to the reliance on deflection, the software will inevitably struggle to understand what sort of multitouch gesture you're trying to do! Your fingers with relation to screen size are simply too big!
When you have a bigger screen or a well designed digitizer + software, it can determine positions of multiple points much more accurately, thus allowing multi-touch.
Click to expand...
Click to collapse
Right.. I get that pinch is tougher on a small screen thats less sensative. The question was posed because there isn't a, what i consider to be cheap (in the 250$ or less range), 10 in capacative android tablet on the market.
If i venture in the the flatpad/apad/epad world... is it the case that it is impossible for that type of screen to do multi-touch? From your response I'm hearing that it IS possible to do multi-touch on a flatpad.. given that there are drivers supporting it. I'd love to have a capacative screen but from what i've seen online, they're going to be twice the cost or more.
eulalie said:
Right.. I get that pinch is tougher on a small screen thats less sensative. The question was posed because there isn't a, what i consider to be cheap (in the 250$ or less range), 10 in capacative android tablet on the market.
If i venture in the the flatpad/apad/epad world... is it the case that it is impossible for that type of screen to do multi-touch? From your response I'm hearing that it IS possible to do multi-touch on a flatpad.. given that there are drivers supporting it. I'd love to have a capacative screen but from what i've seen online, they're going to be twice the cost or more.
Click to expand...
Click to collapse
A dilemma huh? To be brutally honest, most budget oriented tablets are simply that: budget oriented. A lot of them (im trying not to generalize) and Ive tried a fair few are poorly implemented tablets and more trouble than they are worth. Slow, laggy, bad battery life. You'll have enough issues to simply forget the lack of multi touch.
If I was after a tablet, hard as it may be, Id wait till some big players launch a proper device...that'll lead to better adoption and less half baked tablets that are more tech demo than retail product.
Bear in mind the lack of android market access on almost all of these tablets. Due to their generic nature, dev work is also a no-go. Everybody and their friends and family have a device out with a costomised, baked os that its not even funny!
Id check out the galaxy tablet from samsung or wait for it to make some waves and bring forth better implemented copycat products
yodafone said:
Without opening up the phone, there are several ways to find out if a phone uses a capacitive or resistive (i.e. pressure-sensitive) screen.
1. Look at the screen off-angle in bright light. You may be able to see a grid of dots that looks something like this and extends over the entire screen surface:
. . .
. . .
. . .
If you can, it's probably not a capacitive screen.
2. Can the screen be operated by a non-conductive object i.e. a toothpick?
If so, it's probably not a capacitive screen.
3. Does the device come with a stylus/"plectrum" and does it require screen calibration?
If it does, it's probably not a capacitive screen.
No mass-market WM device to date has a capacitive touchscreen, including the X1. The first post of this thread will help you understand why: http://discuss.pocketnow.com/showthread.php?threadid=23389
Click to expand...
Click to collapse
The HTC HD2 is a capacitive touch-screen phone, was mass marketed on WM and has the dots (not horizontally but diagonally). Dont talk about it if you dont know about it.
http://crave.cnet.co.uk/mobiles/htc-hd2-first-windows-mobile-with-capacitive-touchscreen-49303837/
Hi guys. I'd like to know if there is any way to calibrate the S-Pen, somethink like in the old Windows Mobile days with that little cross which you had to tap to calibrate your screen to the stylus. It's off by a few pixels on my note, which makes it annoying.
+1 .......
My GN too is off by a few pixel and is kinda annoying specially for some precision drawing.
It's supposed to be off, that's why you set it for left and right handed so you can see what your doing.
All you need to do is get used to it.
yeah that how they design . like set the right hand then it will off a bit on the left . if setting using left hand then it will off to the right side a bit. but its only on s memo ? seem to be spot on in browsing web.
I just did a little discovery. When I touch the screen either with one finger of my other hand or with part of the hand which holds the pen TOGETHER with S Pen, the accuracy is much better then by touching the screen solely by S Pen. Tested with default stylus and some OEM Lifebook tablet PC stylus. Both behave better when I rest my palm on screen while drawing/writting.
cube48 said:
I just did a little discovery. When I touch the screen either with one finger of my other hand or with part of the hand which holds the pen TOGETHER with S Pen, the accuracy is much better then by touching the screen solely by S Pen. Tested with default stylus and some OEM Lifebook tablet PC stylus. Both behave better when I rest my palm on screen while drawing/writting.
Click to expand...
Click to collapse
Are you sure you aren't just holding the pen at a slightly different angle when doing that? The way you hold the pen makes quite a big difference to the accuracy in my experience.
I think that the precision of the pen is perfect.
I think it's wrong yours handle
not using the pen perpendicular ...
try to held the s-pen as a real pen (inclined) and you'll find it very precise.
you must use it as you use one pen with a sheet of paper
I don't think you write with the pen perpendicular the book...
Elenkis said:
Are you sure you aren't just holding the pen at a slightly different angle when doing that? The way you hold the pen makes quite a big difference to the accuracy in my experience.
Click to expand...
Click to collapse
The angle definitely impacts the precision. As written above the usual 'paper and pen' holding is the best and also the upward pen button orientation helps. But somehow I get even more precise results when touching the screen.
I just get a my replacement of galaxy note from the shop due to the screeen problem in my last phone.
I am quite frustrated because I found that my s pen really needs calibration. My last galaxy note, although the screen had problem, it didn't have any calibration problem that the s pen is so accurate. So unhappy
Sent from my GT-N7000 using XDA App
SNiiPE_DoGG said:
It's supposed to be off, that's why you set it for left and right handed so you can see what your doing.
All you need to do is get used to it.
Click to expand...
Click to collapse
It should get used to me, not the other way round.
I'm left-handed, and many left handers have different ways of holding pens due to smudge-avoidance habits. Setting the phone to "left handed" may suit some lefties, but not me.
What's so difficult about allowing personal calibration, Samsung?
I've found my pen is inaccurate too, unless you're holding it and using it like a pen and not a stylus... If that makes sense?
If you use it like a traditional stylus on resistive touch screen and expect the point of the stylus to be exactly where it hits the screen regardless of pen angle then it'll always appear to be very inaccurate. But if you treat it more like a normal pen and hold it at a normal handwriting angle and except the mark to appear where the tip of the pencil would be in that position its just fine.
Change your mindset: This is a standard pencil, not a stylus. Once you treat it like a normal pencil/pen and use it like you normally do handwriting instead of as a stylus poking at the screen you'll find its very good.
mine also a bit off its upper then the actual touch point.
Sent from my GT-N7000 using XDA App
erlz said:
mine also a bit off its upper then the actual touch point.
Click to expand...
Click to collapse
Mine too. I really think this was a deliberate move by Samsung. More like a pencil/pen than a stylus.
daxmedflax said:
Mine too. I really think this was a deliberate move by Samsung. More like a pencil/pen than a stylus.
Click to expand...
Click to collapse
This. It's supposed to be this way, to make writing more natural. Not a flaw, but I do wish there was an option to disable it. Maybe a mod in the future will enable us to.
Sent from my GT-N7000 using xda premium
Unsinkable II said:
It should get used to me, not the other way round.
I'm left-handed, and many left handers have different ways of holding pens due to smudge-avoidance habits. Setting the phone to "left handed" may suit some lefties, but not me.
What's so difficult about allowing personal calibration, Samsung?
Click to expand...
Click to collapse
Fully agreed - we should be able to calibrate it. and it should definitely get used to us and not the other way around!!!!
Sent from my GT-N7000 using XDA App
kebong said:
This. It's supposed to be this way, to make writing more natural. Not a flaw, but I do wish there was an option to disable it. Maybe a mod in the future will enable us to.
Sent from my GT-N7000 using xda premium
Click to expand...
Click to collapse
It seems like a flaw to me. When I use it towards the center of the screen it seems OK, as I get closer to the edges it drifts off center. It certainly looks like a calibration bug to me.
same issue, need to hold it like a pen
http://forum.xda-developers.com/showthread.php?p=19491160
Check out this thread
I posted a rather long thing about the accuracy issue.
Basically, there's a set offset based on left/right handedness, which will change depending on the orientation of the screen. If the angle at which you write moves outside of what Samsung deems "normal" then it becomes horribly inaccurate.
Everyone is trying to stick up for and justify this pen problem...if this is the case, how come other drawing programs on the note aren't nearly as bad?
I read the thread about the apps for artist and even bought layer paint because of good review. I have also tried some free apps mentioned for drawing and the smoothest seems to be TV paint (for sketches). I cant afford to buy all the other apps right now to try it. So my question is, is there any app that is meant for drawings but as smooth as TV paint with palm rejection, pressure sensitivity and layers function? I know we can draw on TV paint but it seems too complicated. Anyone found a nice app with smoothness for sketching?
Also question to people who have updated Jelly bean. How is the Photoshop touch? Please can you mention the difference compared to ICS.
I have Autodesk Sketchbook pro for tablets, and it's the best app out there IMO. I've seen other reviews saying the same. It's quite cheap too.
Sent from my GT-N8010 using xda app-developers app
sraix001 said:
I read the thread about the apps for artist and even bought layer paint because of good review. I have also tried some free apps mentioned for drawing and the smoothest seems to be TV paint (for sketches). I cant afford to buy all the other apps right now to try it. So my question is, is there any app that is meant for drawings but as smooth as TV paint with palm rejection, pressure sensitivity and layers function? I know we can draw on TV paint but it seems too complicated. Anyone found a nice app with smoothness for sketching?
Also question to people who have updated Jelly bean. How is the Photoshop touch? Please can you mention the difference compared to ICS.
Click to expand...
Click to collapse
TV Paint looks complicated, because its not actually a paint tool, its a full animation studio. I had a play with it the other day... impressive, but complicated!
I will learn it anyway though, there is also a help manual on the TV website.
As far as free apps goes... theres a free version of sketchbook pro, but I'm not sure what features it has locked because it is free. Theres a free version of Infinite Paint (Note) as well, which is a version specifically designed for the galaxy Note.
Markhypnosis said:
I have Autodesk Sketchbook pro for tablets, and it's the best app out there IMO. I've seen other reviews saying the same. It's quite cheap too.
Click to expand...
Click to collapse
In my experience, it doesnt palm reject. Im always zooming around or lines are just flying away from my point. I've gotten into the habit of working on LectureNotes but theyre all line drawings, ill try coloring soon and will report back.
I heard the same thing that sketchbook pro doesn't have palm rejection. I rest my palms alot and it's a must have for me. I can afford to buy few apps and test it but not all that was mentioned in the other thread. But damn TV paint is so smooth. Wish they could release an artist version.
I use sketchbook pro and don't seem to have trouble with my palm now, trick is to enable hovering pen icon in settings annd when you paint make sure the hovering icon is showing before putting your palm down and as long as you have that icon showing it you won't leave marks with your palm although it may zoom in and out sometimes but that's better than marks or lines
Sent from my GT-I9300 using xda premium
Samsungnooby said:
I use sketchbook pro and don't seem to have trouble with my palm now, trick is to enable hovering pen icon in settings annd when you paint make sure the hovering icon is showing before putting your palm down and as long as you have that icon showing it you won't leave marks with your palm although it may zoom in and out sometimes but that's better than marks or lines
Sent from my GT-I9300 using xda premium
Click to expand...
Click to collapse
Thanks for the tip. I keep turning my tablet around just to get the best angle to draw without touching the screen. Although an SPen only mode would be much more useful.
I believe there already is a Pen-only Mode in the notification menu
mingwa said:
I believe there already is a Pen-only Mode in the notification menu
Click to expand...
Click to collapse
Can you clarify? Are you referring to the pop-up notification when removing the s-pen from its holder?
Sorry for not specify that this feature is found on the thinkpad tablet, I don't know if the note has one though. Anyway it is under Display setting
How can you glass evolving in the future if it becomes a success?
I think the current implementation with the screen in corner will eventually be changed to dual transparent amoled screens on the lenses. This will make it possible to have a 3d ui as each eye will see a different screen.
How about controlling it? Maybe it will work like Xbox's Kinect allowing you to interact with it using your hands?
Or do you think using the whole lense as a screen would be too distracting and dangerous and never be implemented?
How can you see glass evolving?
I think the screen is going to be used solely as a feedback device do you know it's doing what you want. The majority of or interaction will be or voice giving commands and the verbal response from glass answering our questions / reading back or commands. I think there's too much distraction for a normal user if it's overlaying across our entire field of view
Sent from my Galaxy Nexus using Tapatalk 2
I've been experiencing a strange phenomenon in relation to the touchscreen on my new Nexus 7. It is essentially impossible to capture in video and difficult to accurately describe, so I apologize for any frustration in comprehending my description.
If I open the Play Store (for example) and gently flick to produce a slow automated scroll, the store page will scroll completely smoothly (aside from the usual few dropped frames as images load). However, if I place my finger on the screen and manually scroll through the page by the same amount at the same speed, it visibly stutters. The stutter produced is not absolutely horrible and some people may not even directly notice it, but it is just enough to make manual input feel sticky. On webpages filled with text where stutter will exacerbate even minor ghosting, it is particularly annoying.
The issue is present globally within the OS, although there are certain games which implement further input smoothing and seem to get rid of it. I was somewhat apprehensive about posting this thread, as it an issue which may be too subtle for many people to directly replicate (assuming I do not simply have a defective device, that is) without an exact understanding of what they are looking for and some may think I'm being "too picky".
To further clarify, I am aware that many people have had multi-touch and phantom input issues on this device, but those are not what I am referring to. I have experienced no multi-touch nor phantom input issues whatsoever.
Has anybody else encountered this issue or should I simply organize a replacement? If it is a software issue, I am perfectly willing to wait for Google to rectify it in a future update.
troy2062 said:
I've been experiencing a strange phenomenon in relation to the touchscreen on my new Nexus 7. It is essentially impossible to capture in video and difficult to accurately describe, so I apologize for any frustration in comprehending my description.
If I open the Play Store (for example) and gently flick to produce a slow automated scroll, the store page will scroll completely smoothly (aside from the usual few dropped frames as images load). However, if I place my finger on the screen and manually scroll through the page by the same amount at the same speed, it visibly stutters. The stutter produced is not absolutely horrible and some people may not even directly notice it, but it is just enough to make manual input feel sticky. On webpages filled with text where stutter will exacerbate even minor ghosting, it is particularly annoying.
The issue is present globally within the OS, although there are certain games which implement further input smoothing and seem to get rid of it. I was somewhat apprehensive about posting this thread, as it an issue which may be too subtle for many people to directly replicate (assuming I do not simply have a defective device, that is) without an exact understanding of what they are looking for and some may think I'm being "too picky".
To further clarify, I am aware that many people have had multi-touch and phantom input issues on this device, but those are not what I am referring to. I have experienced no multi-touch nor phantom input issues whatsoever.
Has anybody else encountered this issue or should I simply organize a replacement? If it is a software issue, I am perfectly willing to wait for Google to rectify it in a future update.
Click to expand...
Click to collapse
got the exact same issue with the two i ordered. Sometimes unlicking is a pain or drag and drop an icon to a screen. I"m waiting to get an update. If the next one is the same. i send them back
I thought this was solved in the last update.
Sent from my Nexus 7 using Tapatalk 4
Yup, This is the exact issue I am so frustrated with. I am really hoping this is a fixable issue..
It's a known issue.
I had the same, and fixed by applying this :
http://forum.xda-developers.com/showthread.php?t=2428133
Hopefully it will be fixed in the next release.
But until then, you can use the above solution.
Sent from my Nexus 7 using XDA Premium 4 mobile app
I had this same issue on two nexus 7 devices (one purchased, the other a replacement unit) but eventually returned both over single touch issues. The stutter was apparent especially in chrome when you pinch to zoom. Feedly was another app that would stutter as you scroll down an article. I assumed this was more of an app specific issue but I guess it may be just another touch related issue with the device.
Sent from my BN NookHD+ using Tapatalk 4
AFAIK, this issue is due to the capacitive touch screen not having a very fine resolution input. It is especially noticeable on cheap tablets. The touch screen has input lines running say on a 1x1cm grid. As you draw your finger across, the line whichever is closest to your finger will register. So it will jump from one line sensing the finger to the next one, and this is then input to the software scrolling and produces a stuttering in the scrolling. You can easily try is by slowly drawing the finger up and down and watching the reaction of the page that is scrolling underneath.
To alleviate this, the screen driver can hand over from one line to the next in a smooth gradual manner but of course there will always be a scrolling rate where the effect is worse. The slower you scroll the clearer you can see it.
If lines are close to each other or you have fat fingers, this effect becomes less noticeable.
[edit] having said that, there are always apps which scroll poorly regardless of the quality of the screen.
^I thought that was the issue at first, but now im thinking its a software issue. The slower I move my finger, the less stuttery the animation. It is only when i move my finger at a medium or fast speed that it begins to stutter like this.
juried said:
AFAIK, this issue is due to the capacitive touch screen not having a very fine resolution input. It is especially noticeable on cheap tablets. The touch screen has input lines running say on a 1x1cm grid. As you draw your finger across, the line whichever is closest to your finger will register. So it will jump from one line sensing the finger to the next one, and this is then input to the software scrolling and produces a stuttering in the scrolling. You can easily try is by slowly drawing the finger up and down and watching the reaction of the page that is scrolling underneath.
To alleviate this, the screen driver can hand over from one line to the next in a smooth gradual manner but of course there will always be a scrolling rate where the effect is worse. The slower you scroll the clearer you can see it.
If lines are close to each other or you have fat fingers, this effect becomes less noticeable.
[edit] having said that, there are always apps which scroll poorly regardless of the quality of the screen.
Click to expand...
Click to collapse
This would be a perfectly plausible explanation, however the amount of stutter doesn't really seem to vary at all, regardless of the speed at which I drag.
juried said:
AFAIK, this issue is due to the capacitive touch screen not having a very fine resolution input. It is especially noticeable on cheap tablets. The touch screen has input lines running say on a 1x1cm grid. As you draw your finger across, the line whichever is closest to your finger will register. So it will jump from one line sensing the finger to the next one, and this is then input to the software scrolling and produces a stuttering in the scrolling.
Click to expand...
Click to collapse
Huh? Try an app like 'Yet Another MultiTouch Test' that displays touch coordinates. The touchscreen certainly has single-pixel accuracy/resolution (a pixel is 0.08mm wide).
tni.andro said:
Huh? Try an app like 'Yet Another MultiTouch Test' that displays touch coordinates. The touchscreen certainly has single-pixel accuracy/resolution (a pixel is 0.08mm wide).
Click to expand...
Click to collapse
It has high resolution (different to accuracy btw) due to the driver software working out where the touch is by using all the pick-up dots that show a capacitive response. But in the Nexus you can actually see the capacitive pick-up dots if you hold it in the sun and get the reflection just right, and they are 5mm apart.
Sent from my Nexus 7 using xda app-developers app
I also have the same stuttering issue, mostly in Chrome browser, when scrolling through some websites. Sometimes the tablet will respond to a scrolling glide but sometimes it will not, this is very annoying, another issue that I have is the random "touch - stuck" problem, where a single touch will register at one spot for 1-2 seconds, and you have to touch that spot again in order to un-stuck it, my Nexus 7 FHD has no problem at all when doing the YAMMT app test, there seems to be a lot of bugs in this tablet, I think Asus just sucks in general, my Samsung Nexus 10 has no problem whatsoever...
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juried said:
It has high resolution (different to accuracy btw)
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What point are you trying to make? The resolution is slightly higher than the display resolution and whatever internal accuracy the touch screen controller has, it is sufficient for that.
due to the driver software working out where the touch is by using all the pick-up dots that show a capacitive response.
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The Elan touch screen controller has it's own microcontroller that is running some proprietary firmware blob that does all the magic. That firmware reports the position. The OS driver is very dumb and just passes that on.
juried said:
The touch screen has input lines running say on a 1x1cm grid. As you draw your finger across, the line whichever is closest to your finger will register. So it will jump from one line sensing the finger to the next one, and this is then input to the software scrolling and produces a stuttering in the scrolling.
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But in the Nexus you can actually see the capacitive pick-up dots if you hold it in the sun and get the reflection just right, and they are 5mm apart.
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That's simply not how things work. The controller measures capacitance at adjacent grid points and determines an interpolated position based on the capacitance measurements. There is no jumping from line to line, the position is smoothly determined using the interpolation.
There are touch screens that only have 2 pairs of grid lines (one pair for X coordinates, one pair for Y coordinates) and rely exclusively on interpolation to determine the position (but they can't support multi-touch).