ESD issue with capacitive touch screen

Roland chung

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#1
Hi all,

I have an issue with ESD on the capacitive touch screen. The touchscreen is mounted in a battery powered equipment. The shielding of touchscreen is connected to the negative of batteries. When performed the ESD tests (?8kV Air / ?6kV Contact), the equipment was damaged.

How should we improve the equipment? Could you please share your experience on this?

Thank you very much.

Roland
 
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Mikishots

Trusted Information Resource
#2
Hi all,

I have an issue with ESD on the capacitive touch screen. The touchscreen is mounted in a battery powered equipment. The shielding of touchscreen is connected to the negative of batteries. When performed the ESD tests (?8kV Air / ?6kV Contact), the equipment was damaged.

How should we improve the equipment? Could you please share your experience on this?

Thank you very much.

Roland
It depends on specifically what was damaged. Would you be able to provide more information? I would only be able to guess that you simply mean that the screen was damaged in some way.
 

Roland chung

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#3
Sorry for the incomplete information. Yes, the touchscreen was damaged. It seems to be very uncommon that capacitive touchscreen is used by medical device.
 

Mikishots

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#4
Sorry for the incomplete information. Yes, the touchscreen was damaged. It seems to be very uncommon that capacitive touchscreen is used by medical device.
OK, damaged in what way? Does not display? Shows blown pixels, asymmetric view, darkening, lightening....

Here's a short, quick and dirty guide of common practices for design of devices utilizing touchscreens.

http://www.onsemi.com/pub_link/Collateral/TND6033-D.PDF
 
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Roland chung

Trusted Information Resource
#5
After the ESD testing, the touchscreen cannot display anymore. I have actually read the article you attached before, but the ESD in medical industry is more severe than IT industry. I have even performed the ESD testing on the iPad, the result is that iPad cannot withstand the ?8kV air discharge / ?6kV contact discharge.
 

Mikishots

Trusted Information Resource
#7
After the ESD testing, the touchscreen cannot display anymore. I have actually read the article you attached before, but the ESD in medical industry is more severe than IT industry. I have even performed the ESD testing on the iPad, the result is that iPad cannot withstand the ?8kV air discharge / ?6kV contact discharge.
Severity is not the issue if your product does not utilize basic ESD protection schemes. We have no idea what precautions or electronic protection methods you've utilized (it could be none, I have no idea), hence my attachment of a "quick and dirty" article.

Without more information, I'm afraid that you won't likely get effective resolution to your problem.

What do your electronic engineers have to say about this? For what it's worth, I have used TPD2E001 diodes from Texas Instruments before - they have +/- 15kV HBM, +/- 8kV contact and +/- 15kV air gap specs.

 
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