Patent ID: 6816144
Filing Date: 2004-11-09
Classification: G09G

Abstract:
A data line drive circuit for a panel display, comprising a selection means receiving a plurality of voltages corresponding to each plurality of data lines, of a number of data lines of the panel display, analog buffers each provided in common for a plurality of data lines, for receiving and outputting the voltage alternatively selected by said selection means, a distribution means receiving an output of each analog buffer for selectively distributing the output of the analog buffer to a selected one of said plurality of data lines, a precharge means provided for each of said plurality of data lines, for precharging a corresponding data line to either a high drive voltage or a low drive voltage, in accordance with at least the most significant bit signal of a digital data corresponding to said corresponding data line, and a control means for controlling said selection means, said distribution means and said precharge means, wherein each scan line selection period includes a precharge period and a plurality of writing periods succeeding to the precharge period, and during said precharge period, said control means controls said distribution means to separate the output of said analog buffers from all said data lines, and activates each precharge means to precharge all said data lines, and during said plurality of writing periods, said control means inactivates each precharge means and controls said selection means and said distribution means in such a manner that during a first writing period of said plurality of writing periods, the voltage corresponding to a first data line of said plurality of data lines, is supplied to the analog buffer and the output of the analog buffer is supplied to said first data line, and during a second writing period of said plurality of writing periods, the voltage corresponding to a second data line of said plurality of data lines is supplied to the analog buffer and the output of the analog buffer is supplied to said second data line.