Transparent overlapping LED die layers

摘要

A first layer of inorganic first vertical LED dies (VLEDs) of a first color is printed on a conductor surface. A first transparent conductor layer is deposited over the first VLEDs to electrically contact top electrodes of the first VLEDs. An electrically insulated second layer of second VLEDs of a second color is printed over the first transparent conductor layer, and an electrically insulated third layer of third VLEDs of a third color is printed over the first transparent conductor layer. For a color display, the VLEDs are printed in an addressable pixel array. Since the VLEDs are printed as an ink, the overlying VLEDs in a pixel are not vertically aligned, so there is little blockage of light. If the structure is used for general illumination, the VLEDs do not need to be printed in pixel areas.

主权项

1. An illumination structure comprising:
a first conductor surface; a first layer of inorganic first vertical light emitting diode dies (VLEDs) distributed on the first conductor surface with spaces between the first VLEDs, the first VLEDs having a bottom electrode electrically contacting the first conductor surface; a light-transmissive first dielectric layer laterally between the first VLEDs; a first transparent conductor layer overlying the first VLEDs and first dielectric layer, the first VLEDs having a top electrode electrically contacting the first transparent conductor layer; a transparent second dielectric layer overlying the first transparent conductor layer; a second transparent conductor layer overlying the second dielectric layer; a second layer of inorganic second VLEDs distributed on the second transparent conductor layer with spaces between the second VLEDs, the second VLEDs having a bottom electrode electrically contacting the second transparent conductor layer, the second layer of second VLEDs overlying the first layer of first VLEDs; a light-transmissive third dielectric layer laterally between the second VLEDs; and a third transparent conductor layer overlying the second VLEDs and third dielectric layer, the second VLEDs having a top electrode electrically contacting the third transparent conductor layer, wherein the first VLEDs are connected in parallel by the first conductor surface and the first transparent conductor layer, wherein the second VLEDs are connected in parallel by the second transparent conductor layer and the third transparent conductor layer, and wherein the first VLEDs and the second VLEDs are not vertically aligned to reduce any blockage of light.