Light-controllable spot luminaires using a liquid crystal light shutter and a high-intensity discharge lamp

Takanori Fujii, Hideo Fujikake, Kuniharu Takizawa, Tsunehiro Hirabayashi, Yoshiaki Tanaka, Kenichi Hirakata, Hisashi Asakawa, Takemi Tamura, Hiroshi Kita

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


New types of light-controllable luminaires using a metal halide lamp or a xenon lamp with a liquid crystal light shutter have been developed and demonstrated for spot or beam spot lighting of television program production. We fabricated a novel liquid crystal light shutter using a heat-resistant composite film of polymer and liquid crystal materials with a wide range of operating temperatures up to 150°C. The light shutter can modulate a strong luminous flux from the high-intensity discharge lamps, instead of a conventional mechanical shutter which has problems such as generating acoustic noise and being stow and heavy. The light modulation of the light shutter is based on a light scattering effect and the degree of scattering is controlled by the voltage applied to the shutter. It exhibits attractive features such as high transmittance, high-speed response, and high extinction ratio. The luminous intensity of an object could be varied continuously using the luminaries with the shutter, and the chromaticity deviation was drastically decreased by driving it with pulse width modulation.

Original languageEnglish
Pages (from-to)13-23
Number of pages11
JournalJournal of Light and Visual Environment
Issue number1
Publication statusPublished - 2002


  • Chromaticity
  • High-intensity discharge lamp
  • Liquid crystal light shutter
  • Spot luminaire


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