spaltenelektrodentreiberschaltung for liquid crystal devices with the ability to simultaneously create anzeigespannungen to spaltenelektroden, as well as the sequential use of abtastspannungen to spaltenelektroden

摘要

There is provided a column electrode drive circuit applicable to a display-integrated type tablet. A hold circuit (24) has a plurality D-flip-flops (27, 28, 29). To clock terminals (CK) of the flip-flops is input an output signal of an AND circuit (26) which receives inputs of a hold signal (LS) and a clock signal (CK'). To data terminals (D) of the flip-flops are input sampled display signals (S1, S2, ..., Sn). With the above-mentioned arrangement, when the hold signal (LS) is at "H" level, the sampled display signals (S1, S2, ..., Sn) are sequentially output as display signals (H1, H2, ..., Hn) without modification based on the clock signal (CK'). When the hold signal (LS) is a pulse signal, the sampled display signals (S1, S2, ..., Sn) are simultaneously output and held as the display signals (H1, H2, ..., Hn) . By thus making a simultaneous output function and a sequential output function compatible, the column electrode drive circuit can be utilized as a column electrode drive circuit for the display-integrated type tablet device. IMAGE