Patent ID: 6072453
Filing Date: 2000-06-06
Classification: G09G

Abstract:
A liquid crystal display apparatus comprising:a first substrate having a plurality of parallel scanning electrodes arranged thereon;a second substrate having a plurality of parallel signal electrodes arranged thereon to cross said scanning electrodes at right angles;a ferroelectric liquid crystal with negative dielectric anisotropy sandwiched between said first and second substrates;scanning electrode driving means for applying to said scanning electrodes a scanning signal having a cycle of one frame period during which all of said scanning electrodes are selected once, said scanning signal including a strobe pulse in a selecting period, and a blanking pulse as a unipolar pulse having opposite polarity to said strobe pulse, a width which is at least twice longer than said selecting period, and a uniform pulse height in a blanking period located before said selecting period; andsignal electrode driving means for applying a data signal to said signal electrodes, said data signal including writing data and non-writing data represented by bipolar pulses having a duration equal to said selecting period, a uniform pulse height, and different waveforms, whereinwhen said data signal represents the writing data, a potential difference between said scanning signal and said data signal in a slot synchronous with said strobe pulse is a writing voltage for changing an alignment of said ferroelectric liquid crystal to one of bistable states,when said data signal represents the non-writing data in the slot, the potential difference is a non-writing voltage which does not change the alignment of said ferroelectric liquid crystal, anda potential difference between said blanking pulse and said data signal includes a blanking voltage for changing the alignment of said ferroelectric liquid crystal to the other state of said bistable states.