Try an internet search on electrostatic dischareg and you will finf there are hundreds of papers on the subject. Merely rubbing your hand across wool or cloth or a waxed desk and garbbing an electronic device will cause ESD . Hold a pocket calculator in your hand while you rub your hand against your pant leg and /or shuffle your shoes across a rug and lay your hand on the LCD display. If there's no ESD protection - the LCD display will blank. - caused by charge dispersal.
Most modern electronic test equipment manufactured in North America is protected to 10Kv ESD disharge anywhere on the outdide of the intrument for the same reason. In the case of a cell phone it used to be possible to blow the front end by holding on to the antenna after charging up some part of the body through friction. In wintertime the problem is very bad in contacting computing equipment. When you find the CE mark on computer equipment you may be assured that it will at least have some immunity to both ESD and radiated and conducted currents. Obviously, the time to incorporate either ESD immunity or EMC is at the design stage. Ralph Cameron EMC Consultant and Suppression of Consumer Electronic Equipment (After Sale) ----- Original Message ----- From: <[email protected]> To: <[email protected]>; <[email protected]> Sent: Wednesday, October 04, 2000 12:02 AM Subject: Re: ESD Opportunities > > ESD is a term used for an electrical discharge that occurs from one charged > surface to another un-charged surface usually generated by frictional or > triboelectric effects. I have never heard of ESD issues within cell phones > or LCD displays. It may be possible that a person with a large charge build > up on their bodies could discharge into the phone when they touch the phone, > or possibly the phone could have a charge that could discharge into your > hand, but in either case it seems very unlikely that an electrical discharge > would happen or if it did that it would have much effect on the cell phone or > display. Have you ever heard of ESD being an issue? Outside of good EMC/EMI > practices I am not sure where or what could be done to prevent ESD. Maybe > others on the list may have some insight into this issue. > > << I am doing a graduate research project on the ESD opportunities that exist > in the telecom market, specifically cell phones and laptops that have LCD's > which are affected by ESD. Is this a market to look into, and what are the > requirements and trends that you see going on? What materials or solutions > are currently being used to address ESD problems in these systems, and are > they they working? Lastly, is ESD a factor that is considered when > designing EMI shielding solutions? > > I would appreciate any insight you may have. Thanks! > kl >> > > ------------------------------------------- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > To cancel your subscription, send mail to: > [email protected] > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Jim Bacher: [email protected] > Michael Garretson: [email protected] > > For policy questions, send mail to: > Richard Nute: [email protected] > > > ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: [email protected] Michael Garretson: [email protected] For policy questions, send mail to: Richard Nute: [email protected]
