Display device
To enable manufacturing of a display device with a low defect rate and high yield, an integrated circuit chip includes a drive circuit that drives a light emitting unit, and the drive circuit includes a P-side electrode connected to an anode of the light emitting unit and a nonvolatile memory transistor that controls current supply to the P-side electrode.
1. A display device comprising:
a plurality of light emitting units each of which has at least one light emitting element, a first surface, and a second surface opposite to the first surface;
at least one connection unit that has a third surface and a fourth surface opposite to the third surface; and
an integrated circuit device that has a plurality of drive circuits each of which is configured to drive a corresponding one of the plurality of light emitting units, and a mounting surface on which the plurality of light emitting units is mounted, wherein
the first surface and the third surface face the mounting surface,
the at least one light emitting element includes at least one first electrode that is disposed on the first surface and a second electrode that is disposed on the second surface,
the connection unit includes a third electrode that is disposed on the third surface and a fourth electrode that is disposed on the fourth surface,
the third electrode and the fourth electrode are electrically connected to each other through an inner portion of the connection unit,
each of the plurality of drive circuits includes a first drive electrode that is disposed on the mounting surface,
the first drive electrode of each of the plurality of drive circuits is connected to the first electrode of the at least one light emitting element included in the corresponding one of the plurality of light emitting units,
the integrated circuit device includes a second drive electrode that is disposed on the mounting surface,
each of the plurality of drive circuits and the second drive electrode are electrically connected to each other through an inner portion of the integrated circuit device,
the second electrode is connected to the fourth electrode,
the third electrode is connected to the second drive electrode, and
the integrated circuit device includes a nonvolatile memory configured to control current supply to the first drive electrode.
2. The display device according to claim 1 , wherein the nonvolatile memory is configured to control, independently in each of the plurality of drive circuits, current supply to the first drive electrode.
3. The display device according to claim 1 , wherein the nonvolatile memory is configured to be able to block current supply to the first drive electrode.
4. The display device according to claim 1 , wherein the nonvolatile memory is configured to be able to perform at least one of decreasing and increasing of an amount of current to be supplied to the first drive electrode.
5. The display device according to claim 1 , wherein each of the plurality of light emitting units includes a plurality of the light emitting elements.
6. The display device according to claim 1 , wherein
the at least one light emitting element included in each of the plurality of light emitting units includes two or more light emitting elements,
in each of the plurality of light emitting units,
the two or more light emitting elements each has the first electrode, that is independent, and
the two or more light emitting elements have one second electrode which is shared therebetween, and
in each of the plurality of drive circuits,
the first drive electrode includes two or more first drive electrodes, and
the nonvolatile memory is configured to independently control current supply to each of the two or more first drive electrodes.
7. A display device comprising:
a plurality of light emitting units each of which has at least one light emitting element, a first surface, and a second surface opposite to the first surface;
a connection unit that has a third surface and a fourth surface opposite to the third surface; and
an integrated circuit device that has a plurality of drive circuits each of which is configured to drive a corresponding one of the plurality of light emitting units, and a mounting surface on which the plurality of light emitting units is mounted, wherein
the first surface and the third surface face the mounting surface,
the at least one light emitting element includes a first electrode that is disposed on the first surface and a second electrode that is disposed on the second surface,
the connection unit includes a third electrode that is disposed on the third surface and a fourth electrode that is disposed on the fourth surface,
the third electrode and the fourth electrode are electrically connected to each other through an inner portion of the connection unit,
each of the plurality of drive circuits includes a first drive electrode that is disposed on the mounting surface,
the first drive electrode of each of the plurality of drive circuits is connected to the first electrode of the at least one light emitting element included in the corresponding one of the plurality of light emitting units,
the integrated circuit device includes a second drive electrode that is disposed on the mounting surface,
each of the plurality of drive circuits and the second drive electrode are electrically connected to each other through an inner portion of the integrated circuit device,
the second electrode is connected to the fourth electrode, and
the third electrode is connected to the second drive electrode.
8. The display device according to claim 1 , wherein
the plurality of light emitting units is arranged to form a group, and
the connection unit is arranged next to an outer periphery of the group of the plurality of light emitting units.
9. The display device according to claim 1 , further comprising a planarizing layer that is disposed outside a region where the plurality of light emitting units is mounted on the mounting surface of the integrated circuit device.
10. The display device according to claim 9 , wherein the planarizing layer has an upper surface that is at a level substantially identical to a level of the second surface of the plurality of light emitting units.
11. The display device according to claim 1 , wherein the plurality of light emitting units is separated from each other by a reflective material that is able to reflect light emitted by the plurality of light emitting units.
12. The display device according to claim 1 , further comprising, for at least a part of the plurality of light emitting units, a wavelength conversion layer that is able to convert a wavelength of light emitted by the plurality of light emitting units.
13. The display device according to claim 1 , wherein each of the plurality of light emitting units corresponds to each of a plurality of pixels or a plurality of sub-pixels constituting a displayed image.
14. The display device according to claim 1 , wherein each of the plurality of drive circuits further has a test transistor electrically connected in parallel to the at least one light emitting element.
15. The display device according to claim 5 , wherein each of the plurality of drive circuits further has a plurality of test transistors electrically connected in parallel to a plurality of the light emitting elements.
16. The display device according to claim 14 , wherein each of the plurality of drive circuits further has a test terminal that is configured to switch the test transistor between an ON state and an OFF state.
17. The display device according to claim 15 , wherein each of the plurality of drive circuits further has a plurality of test terminals that are configured to switch the plurality of test transistors between an ON state and an OFF state.
18. The display device according to claim 12 , further comprising a light-shielding layer disposed between a plurality of the wavelength conversion layers adjacent to each other.