Static discharge killing LCD

peteralieber

• May 20, 2014 09:07

We have had an ESD kill the LCD.  It is still very faint (like the constrast is way down), but definitely not working correctly anymore.  I realize that it is obviously no defective, but what can we do to reduce the LCD module's exposure to ESD?  It will eventually be shipped in a product to users that won't necessarily have ESD protection.

0

• 

  Michael_L

  • May 20, 2014 10:07

  I'm not sure which display you are referring to, but below is a couple of typical things that can be done to reduce ESD exposure:
  
  - Add an ESD protection diode between VDD and Ground
  - Ground the bezel of the display

  0
• 

  peteralieber

  • May 20, 2014 11:07

  We are using the NHD-0216K3Z-FSRGB-FBW-V3
  
  I thought this module had a protection diode on it.  Also, is the bezel connected to signal ground on the board?

  0
• 

  Michael_L

  • May 20, 2014 12:07

  That particular display actually does not have a protection diode on it.  The non-RGB models of this display do however.
  I apologize for the confusion, as it does say in the RGB model's spec that it has protection diodes.
  We will update this error in the spec right away.
  
  The display's bezel is not connected to signal ground on the board.

  0
• 

  lcdusr

  • April 15, 2015 12:07

  We are having the same issue with an NHD-C12832A1Z-FSW-FBW-3V3.
  
  Can you advise the best places for ESD protection?  The symptoms after ESD testing is that the contrast is very low (ie: looks very dim).  Should we add ESD protection to all the voltage pins (ie: V0-V4, C1, C2, Vcc)?
  
  Any other tips?

  0
• 

  Michael_L

  • April 15, 2015 13:07

  You can try adding ESD protection on just VDD, or VDD and VCC and run your testing.  Then you will be able to determine if more protection is needed on the V1, V2, etc. lines.

  0

Please sign in to leave a comment.