Don’t press too hard, John! How to solve TFT LCD touch screen sensitivity problems?

Don’t press too hard, John! How to solve TFT LCD touch screen sensitivity problems?
Is Touch panel in a TFT LCD display not working? Really? How to solve this problem.
John, a Project Engineer has a problem with a TFT LCD display. Whe he added additional cover glass on the display the touchpanel stopped working properly. What to do now? Press hard? Is that a good solution? Let's help John to solve his problem.
Let’s imagine you have a touch screen on your new product - a coffee machine. The device is not working properly, because the display is not responding to touch. To make it work you try tuning the controller - by increasing the sensitivity and changing the threshold. But by doing so you end up with other issues, like ghost touch effect. Finally, your solution is to press the screen really hard. And you put a sign on the coffee machine, saying:
TO MAKE COFFEE - PRESS HARD :(
You may still wonder, how can you make it work right. Yes, there is a way.
In this video, we’ll show you what was the root of the problem and how you could have avoided it. Here are the two major takeaways, but please read on to clarify them:
TAKEAWAY #1: To make precise tuning to a touch screen controller you need to do it during an early R&D stage. Avoid changes in design (like adding extra cover glass based only on datasheet) without having them thoroughly tested before production.
TAKEAWAY #2: When you choose your touch screen controller for demanding applications - always prefer industrial over consumer grade. Industrial grade will perform better and allow you more control over parameters like SNR.
For more information please read the article: riverdi.com/bl...
Don’t press too hard, John! How to solve TFT LCD touch screen sensitivity problems?
Is Touch panel in a TFT LCD display not working? Really? How to solve this problem.
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Don’t press too hard, John! How to solve TFT LCD touch screen sensitivity problems?
Is Touch panel in a TFT LCD display not working? Really? How to solve this problem.

[@Riverdi]

For more information please read the article on Riverdi blog: riverdi.com/blog/how-to-solve-touch-screen-sensitivity-problems/

[@MarkDrumatan]

Great video guys! Very informative.

[@JakeBlake-un5gu]

So I recently ordered one of your top-of-the-range STM32 displays. The product seems impressive, but I had a similar problem with the touch sensitivity out of the box. Is it possible to tune its touch controller gain and threshold? Will there be some guidance how to do it?

[@Riverdi]

Hi Jake, thanks for your comment. Please send PN of display that you have bought to [e-mail] and for sure we will be able to help you.

[@JakeBlake-un5gu]

Thanks I'll get in touch with you soon.