Industry applications
7.1 Electrostatic Protection Solution for Screen Flickering and Malfunctioning
All display screens have a baseband, which contains an IC that maintains the normal operation of the screen. Static electricity can intrude from the casing or any point on the PCBA board, affecting the normal operation of the baseband IC. The rated operating voltage of these ICs is typically around 3V, and they operate at relatively fast frequencies.
Here are some issues faced by customers:
1.Household Appliance Display Client: Upon subjecting the display to 20kV air discharge static, the screen would frequently freeze, only to recover upon restart. Analysis of the circuit board by Leiditech revealed that although the client had already incorporated numerous ESD components, the voltage ratings were incorrect, and the capacitance values were too high. Leiditech recommended using ESDA3.3CW-4 to resolve the ESD issue.
2.Workshop Tablet Control Device: The client previously chose SD03C components with excessively high capacitance. Despite the client's painstaking efforts to load additional capacitors, the results remained unsatisfactory. Leiditech suggested directly replacing them with GBLC03C without altering the PCB layout. Alternatively, if the PCB modification is an option, ESDA3.3CW-4 could be the preferred choice, replacing four GBLC03C components and eliminating the need for four SD03C components and four capacitors altogether.
3.Automotive Dashcam: Static and lightning pulses from striking the casing would lead to the screen freezing. Given the automotive context, the test grades are higher. ESDA3.3CW-4, GBLC03C, or SD03C could be added for protection. However, overall EMC (Electromagnetic Compatibility) improvements are also required, which is a topic for discussion with the EMC correction engineers.
