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Liquid crystal apparatus having light quantity of the backlight in synchronism with writing signals

  • US 4,958,915 A
  • Filed: 02/13/1989
  • Issued: 09/25/1990
  • Est. Priority Date: 07/12/1985
  • Status: Expired due to Fees
First Claim
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1. A liquid crystal apparatus, comprising:

  • a liquid crystal panel comprising a plurality of scanning lines, a plurality of information signal lines, and an plurality of picture elements disposed along each of the scanning lines and comprising a ferroelectric liquid crystal;

    a backlight disposed behind the liquid crystal panel for illuminating the liquid crystal panel, said backlight changing the light quantity emitted therefrom with the lapse of time at least between a low level and a high level; and

    means for synchronizing the low level of the light quantity of the backlight with a writing period when a selection scanning signal is sequentially applied to said scanning lines in phase with information signals to provide a writing voltage signal of one or the other polarity exceeding a threshold of the ferroelectric liquid crystal, a nonwriting voltage not exceeding the threshold being applied in a nonwriting period when at least one of the selection scanning signal and the information signal is not applied to the signal lines, and wherein the light quantity assumes the high level when both the selection scanning signal and the information signal are not applied to the signal lines.

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