Flare reduction of liquid crystal filters for video image capturing

Hideo Fujikake, Hiroto Sato, Masahiro Kawakita, Yoshiki Iino, Hiroshi Kikuchi

Research output: Contribution to journalArticlepeer-review


We studied the flare appearing in video images when a liquid crystal filter is used in front of a video camera. To clarify the generating mechanism of the flare, the relationship between the concentration of spacer particles dispersed in the liquid crystal and the intensity of light scattered by the filer was examined in detail by using a schlieren optical system with a laser light beam. We found that the light scattering is mainly caused by the spacers and glass substrates, so we evaluated their contribution ratio. From microscopic observation, we determined that the light scattering originated by the spacers includes light scattered by the spacer particles and that resulting from by liquid crystal alignment deformation caused by the spacer surfaces. As the light scattering of the spacers was in proportion to the spacer concentration, it could be considerably reduced by decreasing the spacer density. The flare in video images was reduced by decreasing the light scattering. The liquid crystal filter fabricated by using the flare-reduction method described above was utilized in actual television program.

Original languageEnglish
Pages (from-to)1669-1673
Number of pages5
JournalKyokai Joho Imeji Zasshi/Journal of the Institute of Image Information and Television Engineers
Issue number10
Publication statusPublished - 2002 Oct
Externally publishedYes

ASJC Scopus subject areas

  • Media Technology
  • Computer Science Applications
  • Electrical and Electronic Engineering


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