| 摘要 |
PCT No. PCT/GB94/02444 Sec. 371 Date May 9, 1996 Sec. 102(e) Date May 9, 1996 PCT Filed Nov. 8, 1994 PCT Pub. No. WO95/13602 PCT Pub. Date May 18, 1995In a method for addressing an array of pixels contained, for example, in a liquid crystal display device, the liquid crystal material is switched from a first stable state to a second stable state by applying a voltage of one polarity and a given duration between electrodes on opposite sides of the pixel. Likewise, the liquid crystal material is switched from the second stable state to the first stable state by applying a voltage of an opposite polarity and given duration between the electrodes, the magnitude of the voltage required between the electrodes to switch from either stable state to the other stable state being subject to different thresholds for different parts of the total area layer. To eliminate the effect of temperature induced variations in the switching threshold of the material, according to the invention after the application of the second voltage, a third voltage is applied between the electrodes, which has a polarity, magnitude and duration which insure that, at the given temperature, the pixel is switched back by the third voltage to the second stable state, over only a part of the portion of the total area over which the pixel was switched to the first stable state by the second voltage. The efficacy of the method according to the invention is further enhanced by the application of fourth and fifth voltages which just fail to insure that the optical state is switched.
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