Select driver circuit for an LCD display

A circuit for use with an LCD display wherein said LCD display contains a first number of pixel columns and a second number of pixel rows on a substrate, said circuit comprising:

• a plurality of row select driver circuits corresponding to said number of pixel rows for electrically energizing said pixel rows, said row select driver circuits being deposited on the LCD display substrate such that an output of each said row select driver circuit is electrically connected to a corresponding pixel row and to a successive row select driver circuit as an activating input;
• said corresponding pixel row being activated by said row select driver circuit for a first predetermined period of time;
• each successive row select driver circuit activating a corresponding pixel row for a second predetermined period of time prior to the termination of said first predetermined period of time such that a longer row select time is provided for each row to charge or discharge the pixels of the corresponding pixel row;
• and
• switching means external to the LCD display and having a first common clock pulse lead electrically connected to all of said row select driver circuits, second common clock pulse leads electrically connected to all even numbered row select driver circuits, third common clock pulse leads electrically connected to all odd numbered row select driver circuits, and a single input clock pulse lead coupled to only the first row select driver circuit as an initialization signal for electrically switching said row select driver circuits such that each pixel row is sequentially energized with an output signal that acts as an initialization signal to the succeeding row select driver circuit, the total number of said common clock pulse leads and the single input clock pulse lead from said switching means is less than the number of pixel rows.

A method for selectively driving pixel rows in a display device, wherein said display device contains a first number of pixel columns and a second number of pixel rows on a substrate, said method comprising the steps of:

• depositing on said substrate a plurality of amorphous silicon row select driver circuits corresponding to said number of pixel rows for electrically energizing said pixel rows;
• connecting an output of each of said row select driver circuits to a corresponding pixel row and to a successive row select driver circuit as an activating input;
• switching said row select driver circuits by switching means external to the display device and connected to said row select driver circuits by leads such that each pixel row is sequentially energized and the number of said leads from the switching means to the row select driver circuits is less than the number of pixel rows;
• energizing a pixel row with a corresponding row select driver circuit for a first predetermined period of time;
• energizing a successive pixel row with a successive row select driver circuit corresponding thereto for a second predetermined period of time prior to the termination of said first predetermined period of time thereby providing a longer row select time for each row to charge or discharge the pixels of the corresponding pixel row;
• and
• electrically connecting first and second pseudo-ground means external to the display device to each of said row select driver circuits an alternately pulsing said first and second pseudo-ground means to reduce undesired effects generated by the row select driver circuits.