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Electro-optical apparatus having antiferrodielectric liquid crystal panel with normalization to prevent white brightening

  • US 6,259,492 B1
  • Filed: 10/08/1998
  • Issued: 07/10/2001
  • Est. Priority Date: 02/12/1997
  • Status: Expired due to Fees
First Claim
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1. An electro-optical apparatus comprising:

  • an antiferroelectric liquid crystal panel; and

    processing means for performing a series of normalization processes as many times as necessary to provide uniform brightness, in a no voltage condition, of all pixels required to exhibit a uniform electro-optical performance in a normalized level that is set not lower than a minimum brightness level and not higher than a level approximately equal to an aging brightness level, wherein said minimum brightness level represents a saturation value of the brightness level, in a no voltage condition, obtained by successively applying to said liquid crystal panel for a period of time, a voltage that causes only liquid crystal molecules in an antiferroelectric state to make a transition to a ferroelectric state, and then terminating the applied voltage, and wherein said aging brightness level represents a saturation value of the brightness level, in a no voltage condition, obtained by applying alternately to said liquid crystal panel, a voltage for a period of time that causes liquid crystal molecules in the antiferroelectric state to make a transition to the ferroelectric state and a voltage for a period of time that causes liquid crystal molecules in the ferroelectric state to make a transition to the antiferroelectric state and then terminating the applied voltage.

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