Modeling and Estimation of LCD Noise Modulation for Radio Frequency Interference

Chulsoon Hwang*, David Pommerenke, Jun Fan, Takashi Enomoto, Junji Maeshima, Kenji Araki

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


A liquid crystal display baseband noise, whose spectrum is much lower than RF bands, is modulated with the carrier signal of cellular communication and interferes with an Rx receiver resulting in a desensitization problem. The modulation phenomenon is modeled with impedance parameters and a modulation coefficient. The coupled noise on the embedded cellular antenna is experimentally validated in both small- and large-frequency offset cases. In addition, to estimate the modulated noise coupling to the antenna earlier in the development process, a numerical simulation method considering the impedance of display drive IC is proposed successfully validated.

Original languageEnglish
Article number7934080
Pages (from-to)1685-1692
Number of pages8
JournalIEEE Transactions on Electromagnetic Compatibility
Issue number6
Publication statusPublished - 1 Dec 2017
Externally publishedYes


  • Liquid crystal display (LCD)
  • mobile phone
  • modulation
  • noise coupling
  • radio frequency (RF) interference

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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