Circuit and system integration onto a microdevice substrate
An integrated optical display system includes a backplane with appropriate electronics, and an array of micro-devices. A touch sensing structure may be integrated into the system. In one embodiment, an integrated circuit and system is integrated on top of micro-devices transferred to a substrate. Openings in a planarization layer (or layers) may be provided to connect the micro-devices with electrodes and other circuitry. Light reflectors may be used to redirect the light, and color conversion layers or color filters may be integrated before the micro-devices or on the substrate surface opposite to the surface of micro-devices.
1. A display system comprising:
micro light emitting diodes on a top surface of a buffer layer;
at least one passivation or planarization layer covering the micro light emitting diodes;
a reflective layer covering the at least one passivation or planarization layer coupling light from the micro light emitting diodes to the buffer layer; and
a color conversion layer or a color filter layer contacting a bottom surface of the buffer layer, opposite from the top surface of the buffer layer with the micro light emitting diodes.
2. The display system of claim 1 , further comprising
contacts deposited over the micro light emitting diodes, through vias in the at least one passivation or planarization layer, to connect the micro light emitting diodes to a backplane.