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Questions tagged [touchscreen]

A display that incorporates a human interface device which records positional information of points of contact between the user and the display

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44
votes
6answers
22k views

Is there a technical reason why most touch screens use glass rather than plastic?

Most modern touch screens in portable devices are made of glass. This glass often breaks if accidentally dropped. Also, it is very reflective, making it difficult to use in strong light. I know that ...
25
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5answers
52k views

How to use a capacitive touch screen without a human hand

I'm a programmer, and I usually hang out over on stack overflow, but I have a electricity question. I'm trying to interact with an APP on my phone by indirectly touching the the screen. Modern ...
20
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5answers
25k views

How can a capacitive touch screen be triggered without human contact?

I want to robotically touch an iPhone screen without any human intervention. I've done some experiments but have not found a reliable solution. It seems even styluses that work through gloves still ...
19
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2answers
1k views

Resistive touchscreen with 5-wire connection & Freescale IMX28

I have a IMX28EVK board and I would like to to connect this board to a 5-wire resistive touchscreen. In the Reference Manual of the I.MX28, Freescale said: LRADC2 - 6 can be used for 4/5-wire ...
11
votes
1answer
4k views

How can electromagnetic interference from a USB charger cause a capacitive touchscreen to malfunction?

Electromagnetic interference from a USB charger can cause a touchscreen on a mobile device to malfunction, with symptoms such as reduced sensitivity or spurious touches. As an example, see http://...
10
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3answers
5k views

Does higher resolution of LCD/LED display mean higher energy consumption for the very same matrix size

If two mobile devices being compared have exactly the same LCD/LED screen (matrix) size and exactly the same battery, will the one with higher resolution have higher battery consumption and thus will ...
8
votes
1answer
1k views

Mimic human capacitance

In a video at Kickstarter a project called Tapcaps is mimicing human capacitance for triggering touches to a capacitive touch screen (the iPhone). At 0:45 in the video we can see a glimpse of the ...
8
votes
3answers
14k views

What is the basic difference between Inductive and capacitive touch screen?

I have seen Smartphones mentioning of two terms frequently; naming Inductive touch and Capacitive touch screen. What is their basic difference and what is the advantage of one over another?
7
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3answers
2k views

Is a human (or other) electrical signal absolutely necessary to activate a capacitive touchscreen?

I know this is the general wisdom, and that someone has asked a similar question here: How can a capacitive touch screen be triggered without human contact? However, I didn't quite understand the ...
6
votes
1answer
945 views

Cutting Touchscreen

For a small hobby project I would like to use a resistive touch overlay. However, sourcing the correct size seems near impossible. Can I cut a resistive (4-wire) touch screen to fit?
6
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4answers
6k views

Conducting plastic for capacitive touchscreens

As I am disabled I have to use a headstick (see picture below) to do stuff on the computer. I also have a phone with a resistive touchscreen, which works well with my headstick. But here is the ...
6
votes
1answer
746 views

Capacitive touchscreen [duplicate]

I am doing project in which I want to perform read and write operation by using a capacitive touchscreen. What I know is I can trigger capacitive touch screen by: By using electromagnet as I heard ...
5
votes
3answers
841 views

Making conductive traces for capacitive touchscreens

This is a follow-up to this question I asked years ago. A short summary: I'm using a head pointer (see my linked question for a photo) with a tip made of plastic, thus non-conductive. The shaft is ...
5
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6answers
6k views

Can a water drop do a “fake” touch on a capacitive touchscreen?

If a capacitive touchscreen is hit by water drops, like rain, will it report a touch? I'm trying to evaluate what is the most appropriate touchscreen solution to use in an outdoor kiosk.
5
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3answers
3k views

Nitrile and touch screens. What is the distance required from your finger to the screen to make it work?

I am working for a safety company and we need to certify how we can use some nitrile gloves with touch screen, I read that your finger needs to be at .5mm to the touch screen to make it work. So ...
5
votes
1answer
883 views

capacitive touch screen

I am currently trying to build a capacitive touch screen. My end goal is to create a giant track pad/keyboard for my computer. Since abnormally large touch screens are quite pricy I have set out to ...
5
votes
1answer
5k views

Arduino - Trigger an iPhone's touch screen with no human interaction

I'm trying to replicate part of this experiment. Specifically, I want to touch the screen with a cable and some aluminum foil whenever I send a signal from an Arduino pin. From the blog post linked ...
4
votes
4answers
3k views

How do I make a micro-controller act as a finger on a touch screen?

I want to make a device that I can place on a capacitive touch screen and it will start tapping the screen repeatedly. Is there any way to do this with the Arduino?
4
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4answers
2k views

Touchscreen Performance (iPhone, iPad, Android, Nexus S, etc.)

Who makes the touch screens for the iPhone or Android devices? Specifically I'm wondering what the sampling rate is for dragging, etc. that gives these devices such smooth touch and drag performance. ...
4
votes
4answers
446 views

Touch detection on big LED screen

I have a big LED screen covered by plastic surface (removable). I want to change image on that screen when someone touches it. Could you give me advise how to do it or some sensor names for further ...
4
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2answers
3k views

How large is “one pixel” for S5 AMOLED display?

Referring to Samsung Galaxy S5 OLED Pixel structure in oled-display.net, in particular this image illustrates the S5 AMOLED pixels: To my understanding, the yellow rectangle should represent "one ...
4
votes
4answers
12k views

How can I make a fine tipped object emit an electric field similar to that of a human finger?

I've asked this before, but knew less about the tech and didn't word the question properly. I know other people have asked similar questions and knew little, so let me be as specific as possible here: ...
4
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1answer
103 views

Glitchy Touchscreen Caused by Charger extra question

In this thread Glitchy Touchscreen Caused by Charger the answer states it is from the USB charger not being rated high enough. I am using the Moto G 1st gen and upon using a charger rated for 5v 800 ...
4
votes
1answer
505 views

How do I control a resistive touchscreen?

The gist of my problem is that I have a resistive touchscreen and a Raspberry Pi, and I need to make one talk to the other using a single ADC of some kind. I have worked with an Arduino and I also ...
4
votes
2answers
306 views

Mutual capacitance sensor behaviour

In a typical mutual capacitance touch sensor when finger approaches sensor it draws electrical field in effect decreasing the capacitance of the sensor (which is described here and here, for example). ...
4
votes
1answer
575 views

Resistive touchscreen to ADC

I want to hook up a resistive touchscreen to an ADC. I'm new to electronics and experienced in developing software. My intention is to learn, I would much appreciate it if you could nudge me into the ...
4
votes
1answer
2k views

iPhone touch screen pulse generator?

I saw this video on Vimeo http://vimeo.com/23507315 and am amazed. Does anyone know how this works? Dies it send a pulse or switch ground? What is the wheel he is turning? What is that big gray thing ...
4
votes
3answers
404 views

Source for small Touch-Panels? [closed]

Is there a company that will sell me a touch panel similar to the IPhone or IPad surface, in single quantities, complete with a Developer Kit? Can I get it in a specific form-factor (say, 2x7 inches)?...
4
votes
1answer
99 views

How do I trigger capacitive touch screen electronically (without hands)? [duplicate]

I would like to trigger a "touch" or "touches" to a smartphone screen electronically without actually touching the screen with my finger using a remote control somehow. The idea would be that every ...
4
votes
0answers
774 views

What material can I lay over a capacitive touch screen to block its operation, while still allowing me to see it? [closed]

I own a Kindle Voyage and would like to be able to hold it anywhere, not just along the edges, while reading. So I'm looking for a material that's clear to read through, relatively lightweight, and ...
3
votes
3answers
1k views

Which color puts the least “strain” on an LCD pixel to avoid burn-in/ghosting?

I am developing a user interface on a cheap Kinco color LCD HMI unit. After leaving a test UI on the screen for about 3 days, there was a very decided "ghosting" effect. I was able to eliminate the ...
3
votes
1answer
409 views

Making a electrical signal detector (Inputs from multiple source)

I am working on an electrical project that, actually works something like a touchscreen digitizer, where I have to generate multiple inputs from over 50-100 sources, and I need to check from which ...
3
votes
3answers
337 views

Can an electric heat mat cause fake touches on a capacitive screen?

After installing one of these heated desk mats on my cold work desk, I've noticed some erratic behavior on touchscreen devices I develop software for when they're laid down on the mat. Most noticeable ...
3
votes
2answers
150 views

Finding the touching angle on a touch-screen?

I am wondering if it is possible to detect from which direction (or at which angle) a human touches a touchscreen. Imagine something like this: Is there any technology out there (e.g. special ...
3
votes
2answers
717 views

Is a capacitive touch screen safe to use?

I was reading about capacitive touch screens. I understood that your hand picks some current flowing on screen. That sounds alarming. Is it safe to use a capacitive touch screen, since it picks small ...
3
votes
2answers
2k views

How does the Microsoft Surface table detect objects?

I saw that the Surface table (now called PixelSense) detect objects. The strange thing is that it's basically an IR screen with LCD on bottom. How does it "scan" them then? Here's a video http://www....
3
votes
1answer
307 views

Touchscreen : how to choose?

I am working on a small touchscreen extension to implement into a robot (show debug, command some basic functions, show points on a map where the robot has to go, etc...). Microcontrollers used are ...
3
votes
1answer
4k views

Is possible to use Ipad touch screen with PIC16F707 MCU for DIY ?

I'm developing a project that I would like to use the Ipad capacitive touchscreen(digitizer) with mTouch controller PIC16F707 but by now I have no clue about the specifications of Ipad touch screen. I ...
3
votes
2answers
6k views

Resistive Touch Screens

I was reading this article today about interfacing a microcontroller with a 4-wire resistive touch screen, and found myself a little bit confused. The article suggested this could be done by using ...
3
votes
1answer
361 views

Smallest touch that can be detected on smartphone touchscreens

Not sure if this is the right place to ask this question, but what is the smallest touch (in terms of height and width) that can be detected on most smartphone screens (capacitive touchscreens found ...
3
votes
1answer
360 views

Simulate capacitive touch

I am using an Arduino Uno and would like to simulate a capacitive tap with zero human contact on my iPhone 5 screen. What seems to work right now is putting a coin on the screen and connecting the ...
3
votes
1answer
221 views

Explanation of touchpoint density in touchscreens

I'm looking at touchscreen supplier specs such as this one. What does the specification "touchpoint density" expressed as touches/sq.cm sq.in or mean? The value given is "> 100,000 touches/in^2". ...
3
votes
1answer
725 views

Capacitive touch screen sensitivity question

I have a question about capacitive touch sensing. I have read a few related questions already (here, here and here) and I think I understand the basics. From my understanding, when a human uses a ...
3
votes
2answers
1k views

Interface with touch screen using arduino

Basically I am trying to stimulate a touch screen with an arduino board. I know this has been asked several times and Ive spent a long time looking at solutions, namely some kind of foil stuck to a ...
2
votes
3answers
4k views

4 wire resisitive touch screen not working

I am having a problem with making 4 wire resisitive touch screen work. : This is the touchscreen I am using. I also have 100 Ohm resistors in series with all the pins. If I understood correctly: Y+ \$\...
2
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2answers
3k views

TFT Resistive screen made multitouch?

Can a TFT Resistive screen be made/used as a multitouch screen? I have a Android 2.2 SuperPad III tablet which comes with a resistive screen and I am developing an app that needs a few features of a ...
2
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2answers
2k views

How to mix to video sources into a split screen (two inputs, one output)

I want to build a circuit for my car (It has two cameras, front and rear) that shows me the front and rear camera in the same screen (splitted), top half the video from the front camera and bottom ...
2
votes
1answer
113 views

How does glass create an electric field?

I'm reading from Microchip's data sheet regarding their MAXTouch microchip, which details on how to create a touchscreen compatible with their chip, and in discussing the "mechanical stackup" of a ...
2
votes
2answers
2k views

What connector for this cable?

I am working on a part of a project for a university exam and it includes an interface with a touch screen. The touch screen is a classic resistive four wire, it comes with a display of course. ...
2
votes
3answers
739 views

Touchscreen DMM Development Board

I think one day soon, if not already now, somewhere, there will be Multimeters that have touchscreens and are software configurable with Apps that allow you to add most anything to your meter like an ...