Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

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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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 touch screens without glass exist. For example,…
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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 touchscreens, as I'm sure everyone here knows are…
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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 rely on the capacitive characteristics of the…
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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 touch-screen control. LRADC6 can be used for the wiper…
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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…
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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 require to be charged more often? For example --…
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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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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 device. It kind of resembles an RFID tag. Can anyone…
runeb
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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 conclusion that by simply grounding e.g. A carrot or…
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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 problem: I cannot operate any devices with capacitive…
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Capacitive touchscreen

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 that some of stylus works by using magnet at its…
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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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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 above: For communication from the Arduino to the…
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Difference between LVDS, MIPI, DPI and DSI

I'm on a project that involves TFT displays and Raspberry Pi Compute Module 4. I noticed that there are several acronyms, protocols confusing information. As I understand it, there are protocols: DBI: Parallel communication. It can have multiple…
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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). Now, I came across this sensor design and tried…
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