CODEWITHSUNDEEP
touchsmartphonetouchscreen
Jay
Jay

Reputation: 3531

Smallest touch point that can be accurately detected on a smartphone screen?

What is the smallest touch point that can be accurately detected on a typical Androud or iOS smartphone screen? Or (if you could reframe this question in a different way), what is narrowest tip that a smartphone stylus could have?

UPDATE

So I've done some Googling of touchscreen suppliers and the only possibly relevant spec I could find was touchpoint density, expressed as touchpoints/unit area. However, the numbers are absurdly high, something on the order of 100k/sq.inch. This would seem to imply that smartphone screens can detect touches that are as small as 10^-6 sq. inches, or touches that are thinner than a hair. Or my understanding of the unit of touchpoint density is flawed.

http://kingtouch.en.made-in-china.com/product/DqOQNaVjferi/China-22-Surface-Capacitive-Touch-Screen-KTT-CA22K-.html

Upvotes: 0

Views: 340

Answers (2)

ziesemer
ziesemer

Reputation: 28707

Assuming that the touch sensor is 1-for-1 with the display (I have no idea if it is), just ask the API: http://developer.android.com/reference/android/util/DisplayMetrics.html

Upvotes: 0

user1131435
user1131435

Reputation:

It varies from smartphone to smartphone, obviously. There are many different kinds of touchscreen (CCD, resistive, etc.) and each of them have their own general precision range. Here's a good PDF for you: (though I don't know who it's by).

The main problem is that this question has too general of an answer. There is no set value, and there is no scale for touchscreen precision (that I'm aware of).

Upvotes: 0

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