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Touch Resolution (Lines Per Inch)

post #1 of 10
4/2/10 at 9:42am
Thread Starter 
Does anyone have an estimate of what the touch resolution of the iPad would be, or know what the touch resolution of the iPhone/iTouch are.

I know that the touch resolution of the iPhone is the best in class, but I'm curious how the iPad compares to Wacom tablets in touch resolution. I don't think the iPad will have near the resolution of Wacom's Intuos line, but it would be a nice surprise if it did.

I suspect that touch resolution will become just as important as visual resolution in the coming years, and hardware makers will tout their resolution as a measurement of the quality of their device.

Either way, I'm excited to be getting my iPad in the mail tomorrow, regardless of it's touch resolution in lines per inch
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post #2 of 10
4/2/10 at 9:53am
Quote:
Originally Posted by TechNewb View Post

Does anyone have an estimate of what the touch resolution of the iPad would be, or know what the touch resolution of the iPhone/iTouch are.

...

The screen size and pixel densities of each of these devices are published on Apple's website and elsewhere. You can calculate these numbers for yourself. Use math. Perhaps, you have heard of it?
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post #3 of 10
4/2/10 at 9:57am
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Quote:
Originally Posted by Mr. Me View Post

The screen size and pixel densities of each of these devices are published on Apple's website and elsewhere. You can calculate these numbers for yourself. Use math. Perhaps, you have heard of it?

I'm sorry, do you understand the difference between touch resolution and visual resolution?
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post #4 of 10
4/2/10 at 10:36am
Quote:
Originally Posted by Mr. Me View Post

The screen size and pixel densities of each of these devices are published on Apple's website and elsewhere. You can calculate these numbers for yourself. Use math. Perhaps, you have heard of it?

Wow, that was a bit harsh. Even if I had the numbers, I would have no idea how to calculate something like this.
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post #5 of 10
4/2/10 at 2:25pm
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Quote:
Originally Posted by JupiterOne View Post

Wow, that was a bit harsh. Even if I had the numbers, I would have no idea how to calculate something like this.

Yes, and his statement was wrong. Pixel density has absolutely nothing of what I was talking about.
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post #6 of 10
4/2/10 at 5:12pm
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Originally Posted by TechNewb View Post

Yes, and his statement was wrong. Pixel density has absolutely nothing of what I was talking about.

Within the last month or so, you may have seen two tests of the touch accuracy of the iPhone compared to the alternatives. The first tests published showed that the iPhone allowed the tester to draw a grid of fairly straight diagonal lines with his finger. The second published test replicated the first using a computer controlled robotic finger. The results were much the same. None of the alternatives were better.

In the real world, I can access pretty much any specific pixel on my iPhone that I want. So, I would say that the pixel density of the iPhone has absolutely something to do with what you were talking about.
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post #7 of 10
4/2/10 at 6:39pm
Thread Starter 
Quote:
Originally Posted by Mr. Me View Post

Within the last month or so, you may have seen two tests of the touch accuracy of the iPhone compared to the alternatives. The first tests published showed that the iPhone allowed the tester to draw a grid of fairly straight diagonal lines with his finger. The second published test replicated the first using a computer controlled robotic finger. The results were much the same. None of the alternatives were better.

In the real world, I can access pretty much any specific pixel on my iPhone that I want. So, I would say that the pixel density of the iPhone has absolutely something to do with what you were talking about.

Actually, as stated in my original post, I already noted that the iPhone was considered best in class, and this is partly because of the recent robotic line drawing tests.

I also was comparing the iPad to a Wacom tablet, and wondering how it's touch sensitivity resolution would compare, and I'm not expecting it to. But it would be cool to use the iPad as a Wacom like tablet. The Wacom's intuos series has about 5080 lpi, and not one single pixel. Thus in what I was trying to ask, pixels have nothing to do with what I was talking about.
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post #8 of 10
4/2/10 at 8:59pm
Quote:
Originally Posted by TechNewb View Post

Actually, as stated in my original post, I already noted that the iPhone was considered best in class, and this is partly because of the recent robotic line drawing tests.

I also was comparing the iPad to a Wacom tablet, and wondering how it's touch sensitivity resolution would compare, and I'm not expecting it to. But it would be cool to use the iPad as a Wacom like tablet. The Wacom's intuos series has about 5080 lpi, and not one single pixel. Thus in what I was trying to ask, pixels have nothing to do with what I was talking about.

You can keep saying that pixel-density has nothing to do with what you are asking about, but it does. That said, cover art for The New Yorker magazine has been drawn on an iPhone using the app Brushes. The only way that you would know that a Brushes creation was created on an iPhone is if someone tells you. The iPad version should be even better. It is now available at the iTunes App Store.
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post #9 of 10
9/16/10 at 9:49am
Quote:
Originally Posted by Mr. Me View Post

You can keep saying that pixel-density has nothing to do with what you are asking about, but it does. That said, cover art for The New Yorker magazine has been drawn on an iPhone using the app Brushes. The only way that you would know that a Brushes creation was created on an iPhone is if someone tells you. The iPad version should be even better. It is now available at the iTunes App Store.

You're so sadly misinformed that it would be comical if you weren't so rude to more knowledgeable people.

The only way that the pixel density of the display would have anything to do with the resolution of the touch sensor is if they were the same device using the same circuits to drive the pixels on the display & sense the touch. This is in fact not the case at all, even for the touch technology called "in-cell" which is integrated into the LCD display. The resolution of the touch sensor is a function of the pitch, or spacing, of the transparent conductive patterns. Also, there is a practical limit on how fine a resolution is possible using the current transparent conductive material & manufacturing process. Finally, a touch screen doesn't need to have a resolution higher than the width of a finger which is about 15mm from edge-to-edge.
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post #10 of 10
4/27/11 at 7:03pm
Quote:
Originally Posted by TechNewb View Post

Actually, as stated in my original post, I already noted that the iPhone was considered best in class, and this is partly because of the recent robotic line drawing tests.

I also was comparing the iPad to a Wacom tablet, and wondering how it's touch sensitivity resolution would compare, and I'm not expecting it to. But it would be cool to use the iPad as a Wacom like tablet. The Wacom's intuos series has about 5080 lpi, and not one single pixel. Thus in what I was trying to ask, pixels have nothing to do with what I was talking about.

I'm curious about this too. I like the pen mode of the Wacom tablets, and I'd like to use my iPad as a "track pad" in that way, but I don't know whether the resolution is good enough to put the mouse pointer where I want it on a high-resolution display. I know a specific point on the iPad screen can be expressed in fractions of a pixel, so it might be possible to get better than, say, 1024. I just don't know how much better. But twice as much as the pixel resolution might be good enough.
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