| 摘要 |
1450915 Controlling light SHARP KK 13 Sept 1973 [19 Sept 1972 3 April 1973] 43104/73 Heading G2F [Also in Divisions G5 and H3] A liquid crystal display device is driven by applying across the liquid crystal an alternating voltage of an amplitude sufficient to excite the liquid crystal when the excited state is required and of an amplitude insufficient to excite at other times. In a device comprising a plurality of cells with figure of eight arrays pulse trains AT 10 , AT 40 of Π12V are applied sequentially to the common electrode of each cell and pulse trains S 2 , S 1 of Π6V are applied to selected and non-selected electrodes of the arrays. The waveforms applied to these electrodes are KD 10 ... KD n . Pulses S 2 are 180 degrees out of phase with pulses AT; pulses S 2 are in phase. Thus when a common electrode and an array electrode are selected pulses of Π18V are applied whilst in half select and non-select cases pulses of Π6V are always provided. The driving circuitry includes a 4 digit shift register (X) Fig. 3 (not shown), storage buffer (X' 1 ), a decoder (DC), a timer (TC) producing pulses T 1 ... T 4 , a signal generator (SG) producing signals S 1 , S 2 and drivers (AT m ), (KD n ) producing signals AT mo , KD no . Drivers (AT m ) include MOS and bipolar transistors. They first convert the two value signal S 1 to a three value signal O 1 and then amplify this to ATmo. |
