Data driver circuit and associated method for use with scanned LCD video display

A method of providing signal data to a display wherein the display has opposed first and second substrates, at least the first of which is glass, separated by a layer of electro-optic material, the method comprising the steps of:

• depositing Y data input lines on the first substrate;
• depositing X groups of Y demultiplexing switches on the first substrate;
• coupling each demultiplexing switch to a respective one of the Y data input lines;
• providing a precharging voltage to the Y input lines for a first time period;
• providing the signal data to the same Y input lines for X successive second time periods;
• enabling each of the X groups of Y demultiplexing switches simultaneously when the precharging voltage is provided during the first time period;
• and
• enabling each of the same X groups of Y demultiplexing switches consecutively and sequentially when the signal data is provided during the X successive second time periods.

A circuit for providing signal data to a display wherein the display has first and second substrates, at least the first of which is glass, separated by a layer of electro-optic material, the circuit comprising:

• Y data input lines deposited on the first substrate;
• X groups of Y pixel elements deposited on the first substrate wherein each pixel element in each of the X groups is connected to a respective one of the Y data input lines;
• a single on-glass gating switch coupled to each respective one of the pixel elements in each of the X groups;
• a first gate means external to the first substrate for providing precharging data to the Y data input lines;
• a second gate means external to the first substrate for coupling signal data to the same Y data input lines;
• a control circuit external to the first substrate and coupled to said first and second gates gate means for enabling the first gate means for a first time period to provide a precharging voltage to the Y data input lines;
• the control circuit subsequently disabling the first gate means and enabling the second gate means to provide signal data to the same Y data input lines during X successive second time periods;
• through the same respective on-glass gating switches;
• and
• a demultiplexing circuit simultaneously enabling all X groups of Y data input lines during the first time period and sequentially enabling the X groups of Y data input lines during successive second time periods.