US Patent 10396137 Testing transfer-print micro-devices on wafer

A method of making and testing transfer-printable micro-devices on a source wafer includes providing a source wafer comprising a plurality of sacrificial portions spatially separated by anchors, the source wafer comprising one or more test contact pads, providing a micro-device entirely over each of the plurality of sacrificial portions, each micro-device physically connected to at least one anchor with one or more tethers, providing one or more electrical test connections from each micro-device to a corresponding test contact pad, testing the micro-devices through the test connections to determine functional micro-devices and faulty micro-devices, and removing at least a portion of the one or more test connections.