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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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1answer
535 views

ESD protection Touch screen

We have an off the shelf display and touch screen (Projected Capacitive). It has passed a contact test at 4kV but failed at 6kV. Are there an measures that we can take to potentially improve the ESD ...
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1answer
307 views

How to use this touch screen button in a circuit?

I have a VCC CTH series touch screen push button, model CTHS15CIC05ONOFF, which I'm trying to use in a circuit to no avail. As far as I can tell from the datasheet, this is how to wire it: The LED ...
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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 ...
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1answer
63 views

Looking for elliptical display or modular display to approximate ellipse [closed]

I'm not very fluent in electrical engineering so please bear with my imagination. Requirements: Photo realistic display, touch screen, approx 7x3 feet (2.1 m x 0.9 m). Option 1: Do elliptical ...
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2answers
271 views

How does the glass screen of smart phones not block the discharge of capacitors in capacitive touch screens?

Glass is one of the best insulators when designing high voltage electronics, and correct me if I'm wrong, but capacitive touch screens work by measuring the charge of capacitors in a grid on the ...
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2answers
3k views

HDMI to LVDS converter [closed]

I am a software developer and now working on a touch screen based project of which I have no or little knowledge. Attached is the schematic of the circuit we obtained from chalkboard electronics. It ...
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0answers
160 views

Capacitive Touch Screen Stylus circuit type of thing

I am trying to figure out how to make a circuit that works much like a stylus for capacitive touch screens such as on an iPhone. Given it's going to be a simple experiment, I was thinking of using an ...
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1answer
164 views

capacitive touch film or integerated capacitive touch panel display? using under glass [closed]

We need to put display under 2mm glass. Our device must have capacitive touch input. which method should we use? Capacitive Touch Films (place it under glass) or LCDs with integrated capacitive touch (...
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2answers
229 views

Choosing a touch screen type for a project

I have a project that I have to choose a touch screen for. I have done some studies on the different type of touchscreens. I would like the screen to be: Multi-touch capable: So a resistive ...
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0answers
890 views

The 4-wire resistive touch is connected to the ADC's input but it doesn't give correct value

I've an STM32F103 MCU and a 4-wire resistive touch. this is the circuit I've wired up: I've written this code: ...
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1answer
323 views

How does a Touch Screen Digitizer Tester work?

I'm currently replacing my screen for my Iphone and having issues with my touch screen dropping. The guy who sold it to me said he used this to test it. http://www.ebay.com/itm/LCD-Display-Touch-...
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2answers
90 views

Fiber Optics as a video source and a switch?

Is it possible to put a fiber optic bundle together and play video thru the colors of the tips (if they were all flush next to each other Is it possible to touch the end of fiber optics with hand or ...
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2answers
345 views

How and What do pullup resistors do?

I am a high school student, with a basic understanding of physics.I am trying to learn how a resistive touchscreen works. I found this link from Texas Instrument to be the best source. But the ...
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1answer
555 views

Are electric linear solenoids the best option to push a capacitive screen button on a smartphone? [closed]

I'm trying to figure out if electric linear solenoids are the best option to activate an interface element on the touch screen of my smart phone. I have also heard of linear actuators and pneumatics ...
0
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1answer
53 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
47 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 (it'...
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3answers
9k 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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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 ...
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1answer
2k 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
350 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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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?
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2answers
609 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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2answers
2k 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
134 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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2answers
113 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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1answer
1k 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
278 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
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 ...
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3answers
840 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
862 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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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 ...
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1answer
239 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
274 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
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 ...
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1answer
507 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
881 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
144 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
138 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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2answers
548 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
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 ...
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2answers
998 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
936 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
172 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
83 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
210 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
1k 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
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 ...
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1answer
186 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
152 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. ...
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1answer
1k 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 ...