Electrical Engineering Stack Exchange
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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

Touchscreens have two components: a display and a touch sensor array. The display is often irrelevant to the form of touch sensor used, and can be CRT, LCD, OLED, eInk, or conceivably any other electronic display technology.

The touch sensor array has many forms. Arguably the most common is capacitive, being present on the overwhelming majority of smartphones and tablets. Resistive touchscreens are also common in older consumer electronics.

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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?
user11832
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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 depending on the thickness of the glove this could…
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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 Cortex M3. I am pretty new to the world of…
Ryl
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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+ \$\rightarrow\$ +5V, X- \$\rightarrow\$ GND, X+…
Golaž
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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 rough blanket, nothing other than my skin and a…
Caters
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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 surfaces? This article mentions that the change in…
user1155386
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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 multitouch screen. When testing the tablet for…
Greg
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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 or sensing lines) that form a grid that when…
Barnstokkr
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Cell Phone Purse w/ Touch Screen Easy Access

Hi I want to make Cell Phone Purse w/ Touch Screen Easy Access in mass production . My question, what is the quality of plastic which used window in front of cellphone which is touch screen . Thanks
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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 of touch can detect it. Is this actually how this…
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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 touchscreen doesn't work. I need it to support multitouch…
Lost in Knowledge
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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 of contact (finger presses), but I have no idea…
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Why doesn't my phone scroll if I place a ring on the screen?

(Full disclosure — I posted this first on Physics SE and it was suggested it might be a better fit here.) If I place a ring on the screen of my phone, and then try to scroll with my finger inside the ring (first diagram), the ring and my finger move…
BeginTheBeguine
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Making a hole in a computer touch screen

I have just replaced the touch screen on my HP laptop. All works well but the opening for the camera on the new touch screen is offset a bit from the original. Hence the camera is looking through the touch screen. Needless to say, the camera is…
Kevin
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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 information there is still to general. On page 2, it…
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