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
220 questions
1 vote
0 answers
46 views
Capacitance touch screen bench test vs field test producing different results [closed]
I have a Capacitive Touch Screen that works flawlessly on bench test (desktop selectable power supply). I have ran it overnight, with voltage fluctuations +-20% power, after being in in the freezer ...
1 vote
0 answers
71 views
Why might a capacitive touch screen lose sensitivity after hours of operation?
Why might a capacitive touch screen loose sensitivity after hours of operation? Only to regain it after a power cycle? Two similar wall mounted smart switches are compared. While one operates as ...
- 3,647
0 votes
1 answer
142 views
Implement GUI on STM32 with TouchGFX and SPI protocol
I want to implement GFX with SPI protocol on the ILI9488 LCD. Since I didn't see clear references on how to do this, I'm working almost by trial and error + reading some references. Now I'm in a ...
0 votes
0 answers
44 views
Is it possible to retrieve the drive/receive lines of a touch panel matrix?
I have a 14 inch touch screen panel with its own USB controller. The controller is a Ilitek 2511QH010: The touch panel is, obiouvsly, completely transparent. My ultimate goal is to read the raw data ...
- 1,593
0 votes
1 answer
77 views
Connecting Toradex Verdin iMX8M Mini to LCD Display with RGB 24bit interface with I2C Touch
I´m building my base board that uses the Toradex Verdin iMX8M Mini SOM module. My base board uses the same electronics from Toradex Verdin Development Board and exports the SOM MIPI DSI interface for ...
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0 votes
0 answers
93 views
Laser pointer sensing array
Have you ever came across some kind of electronic array that can sense laser pointer device from a distance of 10-15 meters? Something that works similar to touch screen, but for light point instead ...
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2 votes
1 answer
226 views
How can I mimic a touch to my phone's screen
Hi I want to build a circuit that can mimic a finger touching a screen. I need to be able to have my device sit on my phone screen and send touch events through the touch screen (which I assume is ...
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2 votes
1 answer
368 views
Why does the air gap between the electrode and the overlay of a capacitive sensor have a negative impact on the touch performance?
I see in the design guidelines that the airgaps between the electrodes and the overlay of the capacitive sensor have detrimental effect on the performance of the touch sensor and they should be filled ...
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1 vote
1 answer
270 views
I2C to USB converter with interrupt
I have a touch screen with I2C and interrupt output and I would like to connect this touch screen over a USB cable to a host controller. I know that it is possible to transfer interrupts on the USB ...
- 11.8k
1 vote
1 answer
292 views
Looking for a large capacitive touch array controller
I'm building a capacitive touch panel. It has an odd shape, so I resulted to building my own with the capacitive diamond array solution. It doesn't have a screen underneath, so it's all contained on a ...
- 21
0 votes
0 answers
133 views
Have I configured the correct current supply for my TFT LCD Backlight?
I am currently working on a custom PCB which integrates a 3.5" TFT LCD. I am planning on driving the TFT backlight using a MIC4801 LED Driver and want to make sure I have configured the correct ...
- 23
0 votes
3 answers
3k views
MIPI DSI touch screen compatibility with Orange Pi 5B
TD;DR Is DSI and MIPI D-PHY TX 4 lane the same thing? I came across a "Waveshare 7.9 touch display for Raspberry Pi" which has two options, HDMI and DSI. As I can see from Orange Pi's ...
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1 vote
0 answers
44 views
technical term for this phenomenon: minor adjustments to a notebook's LED-LCD screen angle result in major legibility issues
Perhaps a bit of background will help you to understand the question I'm trying to formulate. I have no engineering background but would like to read more about this LED-LCD phenomenon though I don't ...
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1 vote
1 answer
274 views
Can I run my 3.5" TFT backlight off of a 3.3V supply?
I just wanted to confirm my thoughts on the selection of resistor value for a 3.5" TFT screen I am working with. The datasheet gives a forward voltage of 3.2 V and a forward current of 120 mA. ...
- 23
0 votes
1 answer
1k views
Need help understanding how capacitive touch sensor works
I watched this tutorial here (Explanation is from the time stamp 01:58 onwards): https://www.youtube.com/watch?v=3KQd9F0P6PI&t=283s and I'm having trouble understanding the concept. I get the ...
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