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
204 views

How do capacitive screens work with rubber head stylus?

Now I kind off know that Capacitive Screens have like capacitors built into them that create an electrostatic field. Now whenever a thing that can carry charge or a conductor touches it distorts the ...
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1answer
184 views

Touchscreen interference (metal frame)

I have one of these. It's connected to a raspberry pi. It's being mounted against a metal frame, but when it's mounted, i get interference on the touchscreen (the mouse jumps all over the place). How ...
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1answer
439 views

Resistive touchscreen - when measuring X, why doesn't Y affect the reading?

A resistive touchscreen (4-wire) looks like this as a schematic: To read an X position, you put voltage across X+ and X- and then read the voltage between EITHER Y pin and ground. How does the Y ...
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1answer
88 views

Touch screen reacts exclusively skin and stylus, how?

I noticed that with my Android phone, the only things that it will respond to when tapped by are my skin and a stylus. It won't respond to taps by anything else. Not a toothbrush, not my hair, not a ...
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1answer
391 views

Capacitor acting as a resistor

I am trying to make a capacitor out of a CNT ink as a touch pad. I dye two strips of fabric which each have an end resistance of ~0.5-1kohm. I have tried various dielectrics and separation distances....
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274 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
114 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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3answers
297 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
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 ...
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1answer
197 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 questions:...
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1answer
54 views

GLCD touchscreen interference with metal frame?

I am trying to use a 128x240 GLCD driven by t6963 and a resistive touchscreen. When touchscreen and the frame are far apart, everything goes well but when I put them together it starts sending touch ...
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Smartphone touchscreen ribbon connector

Does anyone know what screen connectors or ribbon connectors for a smartphone like the galaxy nexus connecting to it's pcb and if simliar with other phones the screen connector that is, i'm finding it ...
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1answer
1k views

What are the pros and cons of resistive and capacitive touchscreen mobile devices?

I have zeroed it down to these two phones Nokia X6 and Nokia C6. Apart from others, one difference is the presence of capacitive touchscreen in one and resistive in the other. If I were to decide ...
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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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2answers
1k views

How to detect the location of an object placed on a display

First of all, I'm primarily a software guy, so excuse my ignorance in this area. What I am trying to do is detect the position and uniqueness of an object (say a small wooden cube) that is placed on ...
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2answers
3k views

Touch screen and cold, dry fingers

I've noticed that when I pick up my smartphone first thing after waking up, the touch screen is not very accurate in picking up my "clicks" and gestures. I'm speculating that it's got something to do ...
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1answer
559 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 ...
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2answers
194 views

Resistive Touchscreen Stands in Midway of the ADC in standby

In a resistive touchscreen I am trying to read x-y position. The schematics is as followed. The code works fine and when I press a point, it reads correct position well but the problem is in standby ( ...
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1answer
168 views

Thermoplastic-based touch panels: why not?

(I'm new to EE.SE, so I don't know if this is on-topic here. Please forgive me.) From what I understand, capacitive touch technology relies on coating one side of a resistive material with a ...
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2answers
2k views

Trying to find a touchscreen that will be compatible with a microcontroller [closed]

I was wondering id anyone knows or have experience with building something that is controlled by a touch screen? I want a 3x3inches touch screen , that will be controlled by an "fairly-easy" to ...
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2answers
1k 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 ...
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99 views

Problem I2C reading RA8875 using TM4C123

I have been working with I2C protocol to create some code for the RA8875 (see for I2C from page 67) using a Tiva board (TM4C123, I2C chapter from page 997), and I was able to paint in the display or ...
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1answer
300 views

Interfacing a four wire resistive touch screen with STM32F429DISCOVERY

I'm trying to interface a 4-wire resistive touchscreen to a STM32F429 Discovery board but I can't figure out how it works. I want the MCU to detect a touch so I configured the 4 pins like this: ...
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1answer
881 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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1answer
225 views

Manufacturing a device from off-the-shelf components [closed]

I pursue an experimental project that comprises the development of a car GPS navigation unit and software for it. We develop and test the software on a working laptop-based prototype which has a USB-...
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1answer
82 views

How to use touch screen shield for GLCD?

I know this is a very elementary question. I was wondering if it is possible to use a touch screen shield on a normal GLCD to change it into a touch-GLCD. I have seen a product which is a transparent ...
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1answer
304 views

Electric stimulus for tactile feedback

While looking around I discovered a demo of Toshiba's tactile feedback system here. I assume that the display is set up to provide a small electrical current that has enough power so that our sense ...
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3answers
3k views

PCB Matrix Touchpad?

Is it possible to DIY your own capacitative touchpad on a PCB? The last page of this mentions it: http://www.ebv.com/fileadmin/products/Products/Fujitsu/FMA1127/...
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1answer
211 views

touch film replacing keyboard

I am evaluating whether it can use "resistive touch film" in project-based cards using USBizi Chipset-100 in place of a conventional keyboard. I would like to see some similar design to see howto make ...
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1answer
540 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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2answers
231 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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2answers
616 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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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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2answers
1k 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
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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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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1answer
149 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 ...
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1answer
1k views

Connect Marsboard with Touch Panel and access GPIO pins

I am thinking about using a MarsBoard A10 and LCD Touch Panel for low volume commercial product but I have to confirm some capabilities first. Firstly, what would it entail to get the Marsboard A10 ...
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70 views

Interfacing touch sensor with stm32f7

I'm having that touch sensor ST IC ST1633i. It's integrated into an LCD. I'm trying to interface with it, but don't know or understand the actual protocol. Here is the protocol So I'm trying to ...
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3answers
79 views

What shape do the electrodes of a touchscreen have?

I know that capacitive touchscreens need two layers of electrodes, but have not found much on the precise shape of those electrodes. Are they just plain straight ribbons, or are there more elaborate ...
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1answer
47 views

Real world objects touching reading the same capacitance?

In my project, I am developing a capacitive sensor based system which attempts to identify if two real world objects(*) get in contact with each other. I have done my homework (some) on Capacitive ...
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434 views

Raw data acquisition from a capacitive touch screen

I'm trying to integrate an existing PCAP touch screen into an experimental project I'm working on. For it to work the way I want, I need access to the raw data from the touch-screen nodes instead of ...
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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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1answer
269 views

What is the current development status of Transparent OLEDs? [closed]

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 ...
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1answer
246 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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1k views

How to address a 16 bit LCD using 8 bit bus?

I need such a TFT with SSD1289 controller, but with 8 bit bus. Does anyone know how to modify it?
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3answers
82 views

How to drive a 3” TFT

I want to display 2 or 3 images in a loop (every 5 seconds or so) on a 3 inch TFT. The TFT can be found here, Resolution 240x400 Screen 3 Inch Tft Lcd with MCU Interface It uses an MCU interface, I ...
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352 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
218 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 a ...
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3answers
532 views

What is the Correct Term for a Touch Screen Type Touch Sensor

This may seem like a silly question, but while we've all heard of touch-screens, I'm looking to build/prototype a device with a touch-surface (no screen) that can register up to four distinct points ...