Printed mesh defining pixel areas for printed inorganic LED dies

摘要

Over a flexible substrate are formed column lines for a display. Over the substrate and column lines are formed a reflective hydrophobic mesh defining pixels. Over the mesh and column lines is printed an LED ink containing microscopic LED dies. The LED ink de-wets from the mesh. The ink is then cured to electrically connect the bottom electrodes of the LEDs to the column lines within the openings (cells) of the mesh. A dielectric then encapsulates the LEDs while exposing the top electrodes of the LEDs. Transparent row lines are then formed along the rows of the mesh to electrically contact the top electrodes in each row. The LEDs within any cell can be turned on by address in a pair of row and column lines. Phosphor dots may be printed to over blue-emitting LEDs to create red, green, and blue sub-pixels for a full color display.

主权项

1. A method for fabricating an addressable display comprising:
forming a plurality of first conductor lines over a substrate; forming a mesh over the first conductor lines and the substrate, the mesh having walls defining an array of openings as pixel areas, wherein the first conductor lines are exposed through the openings; printing a light emitting diode (LED) ink within the array of openings, the LED ink containing inorganic LED dies having bottom electrodes and top electrodes; curing the LED ink such that the bottom electrodes electrically contact the first conductor lines within the pixel areas; and forming a plurality of second conductor lines electrically contacting the top electrodes, such that energizing combinations of the first conductor lines and the second conductor lines turns on LEDs within a selected pixel area.