An evaluation method for de-sense due to display module is proposed in this paper. Though de-sense issue has been problem for decades, it is known to be difficult to infer problems from the component-level analysis. The novel modeling is introduced and validated for estimating de-sense in module and set measurements.

An external noise coupled into the power net of mobile driver IC can reveal as flicker or weak horizontal fluctuation in the display. This is a kind of conducted EMS study in electronics. Though conducted EMS for IC has been studied for several decades, conducted EMS dedicated to mobile display has been rarely researched. In the present paper, we find such noise causing abnormal display using noise injection system composed of CDN, power amplifier, and signal generator. Furthermore, we evaluate the noise at the IC input by simulation for identifying its effectiveness on the operation of driver IC. Based on this evaluation result, IC makers can simulate the abnormal analog output which may be visible in mobile display.