Method and apparatus for driving light emitting polymer displays

An apparatus for driving a display device having a plurality of diodes arranged in a matrix of a plurality of rows and a plurality of columns, said apparatus comprising:

• an adaptive power source for generating a device voltage, said adaptive power source using a maximum voltage as feedback to generate said device voltage, wherein said device voltage results in a fixed current flow through said plurality of diodes;
• a plurality of current mirror circuits providing drive current to said plurality of columns, each of said plurality of current mirror circuits using a fixed current reference and said device voltage from said adaptive power source to provide said drive current to each of said plurality of columns of said plurality of diodes of said display device;
• and
• a peak voltage detector obtaining said maximum voltage from said plurality of columns.

An apparatus for driving a display device having a plurality of diodes arranged in a matrix of at least one row and at least one column, said apparatus comprising:

• a power source for adaptively providing a device voltage adequate for applying a fixed current flow through said plurality of diodes;
• a pre-charge circuit for providing a desired pre-charge current for each of said at least one column of said matrix, wherein said pre-charge circuit receives operating power from said power source;
• a voltage detector device for determining a maximum voltage across said at least one column of said matrix, said maximum voltage being fed back to said power source for adaptive adjustment of said device voltage;
• a current mirror circuit providing drive current for said each of said at least one column, said current mirror circuit providing said drive current to said each of said at least one column of said matrix of said plurality of diodes of said display device when said pre-charge circuit is disabled.

A method for driving a display device comprising:

• coupling a matrix driver with a display device having a plurality of diodes arranged in a matrix, said matrix having a plurality of columns and a plurality of rows;
• obtaining a device voltage from a power source for powering said plurality of diodes of said display device, wherein said power source adaptively adjusts said device voltage to maintain a fixed current across said plurality of diodes;
• providing a desired pre-charge current to each of said plurality of columns of said diodes of said display device from one of a plurality of pre-charge circuits, each of said plurality of pre-charge circuits receiving power from said power source;
• using a plurality of current minor circuits to provide drive current to said plurality of columns, each of said plurality of current mirror circuits using a known current source and said device voltage to generate said drive current to each of said plurality of columns of said plurality of diodes of said matrix.

A method for driving a display device comprising:

• coupling a display device having a plurality of diodes arranged in a matrix having at least one column and at least one row with a driver device, said driver device coupled with said matrix of said plurality of diodes of said display device;
• generating a device voltage for powering said plurality of diodes of said display device, wherein said device voltage adaptively adjusts to maintain a fixed current across said plurality of diodes;
• providing a pre-charge current to each of said at least one column of said matrix for a pre-determined event wherein said pre-charge current is disabled after said pre-determined event;
• determining a maximum voltage from all of said at least one column of said matrix, said maximum voltage being optionally used in generating said device voltage;
• generating a drive current from a fixed current source and said device voltage for said each of said at least one column;
• and
• providing said drive current to said each of said at least one column after said disabling of said pre-charge current.