Mixed-field-switching liquid crystal mode using in-plane and fringe fields self-adjusted by bottom floating electrode for transmittance enhancement

Min Kyu Park, Seong Woo Oh, Ji Sub Park, Dong Jin Lee, Kyoung Ho Park, Joun Ho Lee, Byeong Koo Kim, Hak Rin Kim

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

We demonstrate a liquid crystal (LC) mode switched by mixed electric fields of in-plane and fringe fields, which are self-adjusted by adopting a bottom floating electrode for enhanced electro-optical properties. In our LC mode structure, conventional in-plane switching (IPS) electrodes are formed as pixel electrodes and common electrodes on an insulating layer and floating electrodes that are patterned per the sub-pixels. When the areas of the pixel and common electrodes are identical, the voltage of the bottom floating electrode is spontaneously determined to be half the value of the pixel voltage, which ideally generates symmetric fringe fields with both pixel and common electrodes. Due to the in-plane fields additionally generated between the pixel and common electrodes, the proposed LC structure operates by mixed-field switching (MFS), which shows higher transmittance than fringe-field switching (FFS) and IPS LC modes. Transmittance of the conventional FFS and IPS LC modes is highly sensitive to the in-plane electrode's width (w) and spacing (l) condition, but the proposed MFS LC mode shows good transmittance without degradation with large variations of the in-plane electrode's spacing-to-width ratio (l/w).

Original languageEnglish
Pages (from-to)908-919
Number of pages12
JournalLiquid Crystals
Volume41
Issue number7
DOIs
StatePublished - Jul 2014

Keywords

  • floating electrode
  • fringe field
  • in-plane field
  • liquid crystal
  • liquid crystal mode

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