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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How can both X and Y electrodes in resistive touchscreens be connected to power supply and digitizer at the same time?

I have been learning about the way touchscreen determine the location of touch, through a link given by a kind stack user. A summary of the method on this website: -first X electrode is connected ...
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1answer
39 views

Why is the conducting layer in resistive touchscreen placed perpendicularly?

I just learned that in analog resistive touchscreen, conducting layers (usually made of indium tin oxide) is placed perpendicular to each other. One on the top flexible film, and one on the bottom, ...
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1answer
33 views

How exactly is the location of contact determined on an analog resistive touchscreen?

I am doing a physics project for my high school course. My project is to explain how a resistive touchscreen works.I have no engineering knowledge. From a description I found on computerworld.com ...
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3answers
328 views

Is it possible to make a plastic touch screen as sensitive and accurate as a glass one?

I learned in this answer that touch screens with a glass front are generally more sensitive and accurate than those with plastic fronts. This corresponds with my personal experience. However, is ...
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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 ...
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1answer
135 views

Have Cell Phone Display Panel(s) been hacked to accept HDMI?

Cell Phone Displays are cheap and have high-resolution and touch sense, but use varied specialized inputs via ribbon cable. So, has the DIY community made any controllers to input HDMI? What about the ...
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3answers
72 views

Does mutual capacitance increase for two positively charged plates when brought close?

My understanding is that any two charge carriers will exhibit what is known as mutual capacitance. That is, there is an amount of charge that can be stored between any two objects, which is called ...
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547 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?
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2answers
58 views

How is the location of a finger or more detected on a capacitive touch panel?

I think I understand the basics of capacitive touch screen, i.e. when one or more fingers touches the panel it creates a potential difference at that location drawing current. But how do you go about ...
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156 views

capacitive switch behind a mirror (silver backing)

I am new to this field, and I would like to DIY a mirror with a hidden capacitive \inductive touch sensor behind it, once touched it will turn on a 12V LED light. I have bought a capacitive switch ...
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1answer
38 views

Reasons of delayed damage signs to AMOLED touchscreen

I had the misfortune of dropping my cellphone (couple of feet). It was working perfectly right away but throughout the day the screen started displaying a darker spot in one corner that overtime ...
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1answer
37 views

Wirelessly connect 5" resistive touch screen to computer

Figured out display, just need to transmit touch signals wirelessly. What I have is a 5" monitor with a USB touch overlay connected to my laptop with a USB cable. I've done quite a bit of research ...
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89 views

What material can I lay over a capacitive touch screen that will still make it work?

So I am trying to build a capacitive touch screen in a table, but since the table is much larger then the touchscreen. I like to put something on top that not only make it easier to clean, but also ...
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3answers
104 views

Why does the human skin steal field lines when it's very non-conductive in dry state?

In projected capacitative touch screens, sensors measure change in electric field coupling from the drive electrode to sense/receive electrode. But don't field lines only terminate on conductive ...
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1answer
45 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 ...
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3answers
239 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 ...
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1answer
132 views

What is the minimal capacitor (capitor type/size/capacity) needed to fool a capacitive touch screen? [duplicate]

Say I want to provide a device (completely batteryless of course, and detached from any human touch) the capability to immitate a touch on a capacitive screen (Galaxy S6 here). I know I just need some ...
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147 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 ...
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69 views

Touch sense controller Dout pin loading

I am working on Touch TFT LCD project where LPC2138 is host (main) controller and TSC2046 is touch sense controller for implementing touch interface. TSC2046 is having SPI interface with conventional ...
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1answer
88 views

Capacitive sensing between two copper plates

Is it possible to detect touch event and its position coordinates between two copper plates spaced apart by approximately 6-7 centimeters? The space between plates have to be transparent.
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1answer
106 views

Difference between line scan sensor and line scan camera? [closed]

I'm looking to build a multitouch table using line sensor/camera technology. I was hoping someone had already tried such a thing and could recommend the best suited between line scan sensor or line ...
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2answers
115 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 ...
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1answer
144 views

Characterizing a capacitive touchscreen

Is it possible to measure a meaningful impulse response of a capacitive touchscreen such as the one you might find on a mobile device, with the goal of "calibrating" devices with different ...
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1answer
165 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 ...
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1answer
82 views

A small compatible gpu [closed]

I would like to know what is the best possible way to solve the following problem: I want to have a touch screen over USB this touch screen should be able to receive Graphics from the attached PC, so ...
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1answer
53 views

Are capacitive display(s) capable of measuring what fraction of a finger is touched?

I'm really curious to get an answer for this question. Since I don't know the functioning of a capacitive display and Google didn't help me on this issue, I landed here. :) Are capacitive displays ...
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121 views

Placing a button on a touch screen?

First off, I know nothing about electrical engineering. So please bare with me. I'm designing a faceplate for a moto360 smart watch that has a small area that overlays the bottom edge of the screen. ...
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2answers
491 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 ...
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2answers
71 views

How do I prevent a capacitive touch from registering?

I'm looking for a thin cloth-like material or something that I can treat materials with that will prevent a capacitive touch from occurring. Everything I've tried either is too thick, or still ...
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1answer
267 views

QTouch Matrix ATmega8 issues

After trying a lot on QTouch Matrix for ATmega8,It didn't work for me. So sharing the trouble here. I have taken reference from this beautiful article. Here he had provided a schematic and PCB ...
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1answer
156 views

What are possible reasons for this not to work

I connected a 5V relay to an Arduino. It then opened and closed the relay, which had on a terminal (doesn't matter which one?) a wire that went to an iPhone' screen (with tin foil at the tip). On the ...
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2answers
59 views

Phone touchscreen malfunction when connecting audio circuit to it's jack

I use this circuit to convert audio signal to infrared signal and control my DSLR camera. It works fine on my laptop jack, but when I plug it to my smartphone jack, it shows some malfunctions in ...
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1answer
98 views

How does this USB capacitive touch light circuit work? You can touch anywhere and it turns on, not just the electrode

Here are some pics of the circuit board. Now I'm not asking how the circuit works, I understand that. There is a capacitive touch sensor IC where the shiny electrode you see on top connects to the ...
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1answer
457 views

Capacitor Touch switch with QTouch

I have been working on QTouch Implementation for ATmega32 Micro controller. I have taken reference from here. I'm facing issue with grounding Problem. For debugging process I am displaying the result ...
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2answers
397 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 ...
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1answer
115 views

How to activate a touchscreen device without human interaction [duplicate]

I need to be able to activate apps on my iPad without human interaction. We have tried dropping batteries onto the screen but that only works if dropped within a few inches. Is there any material in ...
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2answers
121 views

Google has no datasheet for ACX502ALM-7 LCD/resistive touchpanel

I have an ACX502ALM-7 series LCD+touchpanel combo. Google cannot find me a datasheet for it. Can any one of you? I'd like to possibly interface it (at least the touch screen part) to an Arduino Uno. ...
2
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1answer
310 views

How does a capacitive multi-touch screen capture multiple triggers?

On which principles does a capacitive touch screen work to enable detection of multiple triggers? I understand that there are two layers; a driving layer and a sensing layer (with x or driving and y ...
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2answers
198 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 ...
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1answer
329 views

Help identifying a voltage regulator

I'm trying to build a portable screen so that I can watch movies around my apartment if I need to move away from my TV screen (think a WiiU gamepad or a tablet). I have many raw components and I think ...
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1answer
119 views

A (touch) screen technology to identify several input devices

This may sound vague, since I am not sure if what I am looking for even exists, but please bear with me. I am interested in a technology that would allow me to not only locate, but also identify ...
2
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0answers
107 views

What is the current development status of Transparent OLEDs?

As far as I can see there are some working prototypes, but has this technology reached the market in a stable way? Does anybody know what's the current status of the TOLED technology? Also do you ...
0
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1answer
77 views

Touch screen type [closed]

I know there are many different types of touch screen out there. In the attached picture, could someone tell me what type of touch screen that is? I am looking to buy some screens like this one for ...
5
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3answers
605 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 ...
3
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2answers
507 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 ...
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114 views

Likely to use more power - phone screen or bluetooth le?

Just as a theoretical guesstimate, would a phone screen likely to be more of a battery drain than a bluetooth le connection? Of course this is going to vary on the amount of data being sent the ...
2
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3answers
925 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+ ...
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6k 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: ...
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2answers
343 views

What exactly does a capacitive touch screen need to register input, and how can that signal be produced?

There are active styli out there, and they take 3A or 4A batteries and don't require any wireless connection. How do those emulate human touch? EDIT: I am specifically interested in iPad touch ...
2
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1answer
167 views

Is to possible to measure electric signals using a capacitive touchscreen?

Thanks to a very good explanation by Mr. Ghosh, I found that a capacitive touchscreen measures the change in capacity, induced by contact with a conductive material, along a grid. I have two ...