Abstract: A current-selectable light-emitting-diode (LED) display includes pixels distributed in an array of rows and columns. The pixels are grouped in mutually exclusive clusters and cluster controllers are connected to each pixel in a cluster of pixels to control the pixels in the cluster to emit light. Each cluster controller comprises a selectable current source. Each of the selectable current sources can include cluster current sources that are responsive to a current-select signal to enable one or more of the cluster current sources. The pixels can include micro-LEDs and the cluster controller can be disposed between the micro-LEDs. The display can be disposed on a display substrate with signal wires. The signal wires can include separate wire segments that are electrically connected through regeneration circuits that regenerate the signals. The display can be an information display or a backlight.

Abstract: A printed structure comprises a device comprising device electrical contacts disposed on a common side of the device and a substrate non-native to the device comprising substrate electrical contacts disposed on a surface of the substrate. At least one of the substrate electrical contacts has a rounded shape. The device electrical contacts are in physical and electrical contact with corresponding substrate electrical contacts. The substrate electrical contacts can comprise a polymer core coated with a patterned contact electrical conductor on a surface of the polymer core. A method of making polymer cores comprising patterning a polymer on the substrate and reflowing the patterned polymer to form one or more rounded shapes of the polymer and coating and then patterning the one or more rounded shapes with a conductive material.

Abstract: An example of a cavity structure comprises a cavity substrate comprising a substrate surface, a cavity extending into the cavity substrate, the cavity having a cavity bottom and cavity walls, and a cap disposed on a side of the cavity opposite the cavity bottom. The cavity substrate, the cap, and the one or more cavity walls form a cavity enclosing a volume. A component can be disposed in the cavity and can extend above the substrate surface. The component can be a piezoelectric or a MEMS device. The cap can have a tophat configuration. The cavity structure can be micro-transfer printed from a source wafer to a destination substrate.

Abstract: A hybrid pulse-width-modulation pixel includes a light controller responsive to a variable power signal specifying different powers and a pixel controller. The pixel controller is operable receive a pixel luminance signal comprising multiple bits specifying a desired light-controller luminance, generate the variable power signal in response to the pixel luminance signal, and drive the light controller to emit light at different luminances in response to the variable power signal for different time periods. The pixel controller is operable to provide the variable power signal at a constant first power for a first time period and provide the variable power signal at a constant second power different from the constant first power for a second time period.

Abstract: A micro-component substrate structure includes a carrier substrate having a corrugated surface and a micro-component having a bottom surface disposed on the corrugated surface. Only a portion of the micro-component bottom surface is in direct contact with the corrugated surface. The micro-component can be removed from the corrugated surface using micro-transfer printing without a tether or anchor structure in the carrier substrate using a stamp with stamp posts. The corrugated surface can be coated with a film. The stamp posts and film can be PDMS and can have different adhesive qualities or areas in contact with the micro-component. The film can be processed to modify its adhesive qualities.

Abstract: A method of printing comprises providing a component source wafer comprising components, a transfer device, and a patterned substrate. The patterned substrate comprises substrate posts that extend from a surface of the patterned substrate. Components are picked up from the component source wafer by adhering the components to the transfer device. One or more of the picked-up components are printed to the patterned substrate by disposing each of the one or more picked-up components onto one of the substrate posts, thereby providing one or more printed components in a printed structure.

Abstract: A module collection and deposition system comprises a container, a module source wafer comprising modules released from the module source wafer, a module collection device operable to remove the modules from the module source wafer and dispose the modules as a disordered and dry collection into the container, and a module deposition device for removing the modules from the container and randomly disposing the modules on a receiving surface. Each module comprises an electronically active unpackaged component.

Abstract: A constant-current passive-matrix array includes a two-dimensional array of pixels. Rows of pixels are each connected in common to a row wire and to a row controller operable to select one of the row wires with a row-select signal. Columns of pixels are each connected in common to a column wire and to a column controller. The column controller provides received pixel values to different column-control circuits, each connected to a column wire. Each column-control circuit comprises constant-current sources and a constant-current-source selection circuit operable to individually and separately enable each of the constant-current sources in response to the pixel value with a constant-current-source selection signal. The outputs of the constant-current sources are electrically connected in parallel to a column wire and the constant-current sources together are operable to output a constant-current column-data signal in response to the constant-current-source selection signals.

Abstract: A hybrid pulse-width-modulation pixel includes a light controller responsive to a variable power signal specifying different powers and a pixel controller. The pixel controller is operable receive a pixel luminance signal comprising multiple bits specifying a desired light-controller luminance, generate the variable power signal in response to the pixel luminance signal, and drive the light controller to emit light at different luminances in response to the variable power signal for different time periods. The pixel controller is operable to provide the variable power signal at a constant first power for a first time period and provide the variable power signal at a constant second power different from the constant first power for a second time period.

Abstract: An electro-optically controlled active-matrix system comprises a system substrate, row wires extending in a row direction disposed on the system substrate, a row controller providing a row electrical signal to each row wire, column light-pipes extending in a column direction disposed on the system substrate, a column controller providing a column optical signal to each column light-pipe, and pixels disposed over the system substrate. Each pixel can comprise a pixel circuit that is uniquely responsive to a row wire and to a column light-pipe, the pixel circuit receiving the row electrical signal from the row wire and receiving the column optical signal from the column light-pipe. In some embodiments, column wires carrying column electrical signals extend in a column direction over the system substrate and the pixel circuit is capacitively coupled to the row wire, the column wire, or both.

Abstract: A white-light-emitting inorganic light-emitting-diode (iLED) structure comprises first iLEDs electrically connected in series, each first iLED emitting a different color of light from any other first iLED when electrical power is provided to the first iLEDs, and a second iLED electrically connected to one of the first iLEDs, the second iLED emitting the same color of light as the one of the first iLEDs when electrical power is provided to the first iLEDs. The second iLED can be electrically connected in series or in parallel with the one of the first iLEDs. Such iLED structures can be used at least in displays, lamps, and indicators.

Abstract: A micro-transfer printing system comprises a source substrate having a substrate surface and components disposed in an array on, over, or in the substrate surface Each component has a component extent in a plane parallel to the substrate surface. A stamp comprises a stamp body and stamp posts extending away from the stamp body disposed in an array over the stamp body. Each of the stamp posts has (i) a post location corresponding to a component location of one of the components when the stamp is disposed in alignment with the source substrate, and (ii) a post surface extent on a distal end of the stamp post. The post surface extent is greater than the component extent.

Abstract: A micro-transfer-printable component source structure includes a source wafer comprising an anchor portion, a sacrificial portion disposed on only a portion of the source wafer adjacent to the anchor portion, a component disposed directly and exclusively over the sacrificial portion, and a vertical tether physically connecting the component to the source wafer. The vertical tether extends from the component along a side of the sacrificial portion to the anchor portion and includes a vertical portion that extends in a direction at least partially orthogonal to a surface of the source wafer. The vertical portion can be between the component and the source wafer or adjacent to the component. Components with vertical tethers require less area on the source wafer and can be micro-transfer printed to a target substrate in closer alignment.

Abstract: A micro-optical structure includes a structure substrate comprising a cavity and a micro-optical component disposed entirely and directly over or in the cavity. The micro-optical component includes a micro-optical element and a component tether physically attached to an anchor portion of the structure substrate and in contact with the micro-optical element. The structure substrate and the micro-optical component can be monolithic, for example unitary and comprise a same material or are the same material. The micro-optical component can be disposed on a sacrificial portion disposed on a micro-optical component source wafer differentially etchable form the sacrificial portion. The micro-optical component can be disposed on a micro-optical component source wafer patterned with an encapsulation layer where the micro-optical component is differentially etchable from the encapsulation layer and the micro-optical component.

Abstract: A device source wafer includes a wafer substrate, devices formed on or in the wafer substrate at a location on the wafer substrate, and test structures disposed on the wafer substrate connected to some but not all of the devices. The devices include a first device disposed at a first location and a second device disposed at a second different location on the wafer substrate. The test structures include at least a first test structure connected to the first device and a second test structure connected to the second device. The first test structure is adapted to measuring a characteristic of the first device and the second test structure is adapted to measuring the characteristic of the second device. An estimated characteristic of unmeasured devices is derived from the first and second device locations and measured characteristics and the device is selected based on the estimated characteristic.

Abstract: A printed structure includes a target substrate having a target-substrate surface, a structure disposed in or on the target substrate, the structures having a structure side that extends at least partially orthogonal to the target-substrate surface, a patterned adhesive layer disposed on the target-substrate surface not in contact with the structure side, and a component having a component side, the component disposed on the patterned adhesive layer with the component side adjacent to the structure side.

Abstract: A method of printing comprises providing a component source wafer comprising components, a transfer device, and a patterned substrate. The patterned substrate comprises substrate posts that extend from a surface of the patterned substrate. Components are picked up from the component source wafer by adhering the components to the transfer device. One or more of the picked-up components are printed to the patterned substrate by disposing each of the one or more picked-up components onto one of the substrate posts, thereby providing one or more printed components in a printed structure.

Abstract: A compound acoustic wave filter device comprises a support substrate having an including two or more circuit connection pads. An acoustic wave filter includes a piezoelectric filter element and two or more electrodes. The acoustic wave filter is micro-transfer printed onto the support substrate. An electrical conductor electrically connects one or more of the circuit connection pads to one or more of the electrodes.

Abstract: A hybrid display includes pixel clusters and a display controller operable to provide pixel values to the cluster controllers. Each pixel cluster incudes (i) pixels; (ii) a pixel memory for storing fewer than two pixel values for each of the pixels; and (iii) a cluster controller operable to (a) control the pixels to emit light corresponding to the pixel values, (b) receive pixel values, and (c) store the pixel values in the pixel memory. The pixel values are digital values and each of the cluster controllers is operable to receive pixel values from the display controller and store the pixel values in the pixel memory at the same time that the cluster controller controls the pixels to emit light corresponding to the pixel values.

Abstract: A white-light-emitting inorganic light-emitting-diode (iLED) structure comprises first iLEDs electrically connected in series, each first iLED emitting a different color of light from any other first iLED when electrical power is provided to the first iLEDs, and a second iLED electrically connected to one of the first iLEDs, the second iLED emitting the same color of light as the one of the first iLEDs when electrical power is provided to the first iLEDs. The second iLED can be electrically connected in series or in parallel with the one of the first iLEDs. Such iLED structures can be used at least in displays, lamps, and indicators.