Image display device and method of driving the same

An image display device having an electro-optical medium interposed between a pair of substrates each provided with an electrode, which comprises:

• (a) a driving means for driving the electro-optical medium by selectively applying voltages to the electrodes of the pair of substrates;
• (b) a reference voltage generator for supplying the driving means with a reference voltage;
• and
• (c) a noise compensating means interposed between the driving means and the reference voltage generator for compensating a noise in a voltage supplied from the reference voltage generator to the electro-optical medium, said noise compensating means comprising;
• (c1) means for inversely amplifying the noise in a noise-superposed voltage which is sampled at a sampling position between the reference voltage generator and the electro-optical medium so that a noise compensating voltage having a polarity which is reverse to a polarity of the noise and a size which is correspondent to a size of the noise, is generated;
• (c2) holding means for holding the noise compensating voltage during a time period of sampling the noise-superposed voltage;
• and
• (c3) switching means, an output of which is connected to the driving means for switching an input of the driving means to either of the noise compensating voltage and the noise-superposed voltage.

A method of driving an image display device having an electro-optical medium interposed between a pair of electrodes each provided with an electrode, a driving means for driving the electro-optical medium by selectively applying voltages to the electrodes of the pair of substrates and a reference voltage generator for supplying the driving means with a reference voltage, said supplying the driving means with the reference voltage comprising the steps of:

• (a) supplying the driving means with a noise-superposed voltage superposed with a noise;
• (b) generating a noise compensating voltage, having a polarity which is reverse to a polarity of the noise and a size which is correspondent to a size of the noise, by
• (b1) sampling the noise-superposed voltage at a sampling position between the reference voltage generator and the electro-optical medium during a time period of supplying the noise-superposed voltage;
• and
• (b2) inversely amplifying the noise;
• (c) holding the noise compensating voltage during a time period of sampling the noise-superposed voltage;
• and
• (d) supplying the noise compensating voltage to the electro-optical medium after the time period of sampling the noise-superposed voltage.