Display device
A display device includes a substrate, a plurality of pixels provided to the substrate, and a plurality of first inorganic light emitting elements and a plurality of second inorganic light emitting elements provided to the pixels. The first inorganic light emitting elements are configured to output first light in a visible light region, and the second inorganic light emitting elements are configured to output second light in an infrared light region.
1. A display device comprising:
a substrate;
a plurality of pixels provided to the substrate;
a plurality of first inorganic light emitting elements and a plurality of second inorganic light emitting elements provided to the pixels;
an element insulating film provided between the first inorganic light emitting elements and the second inorganic light emitting elements and covering at least a side surface of the first inorganic light emitting elements and the second inorganic light emitting elements; and
a cathode electrode provided covering the first inorganic light emitting elements, the second inorganic light emitting elements, and the element insulating film and coupled to the first inorganic light emitting elements and the second inorganic light emitting elements,
wherein
the first inorganic light emitting elements are configured to output first light in a visible light region,
the second inorganic light emitting elements are configured to output second light in an infrared light region,
the second inorganic light emitting elements include:
a second light emitting element for a light source outputting the second light by being driven in forward bias; and
a second light emitting element for detection outputting signals based on the second light incident thereon by being driven in reverse bias,
the cathode electrode has a first opening in a region overlapping the second inorganic light emitting elements,
a black member is provided on the cathode electrode,
the black member has a second opening in a region overlapping the first opening, and
the area of the second opening is larger than the area of the first opening in planar view seen from a direction perpendicular to the substrate.
2. The display device according to claim 1 , wherein
the first inorganic light emitting elements and the second inorganic light emitting elements each comprise an anode terminal and a cathode terminal,
the anode terminal of a second inorganic light emitting element for a light source is supplied with a first potential, the second inorganic light emitting element for the light source being configured to output the second light out of the second inorganic light emitting elements, and
the cathode terminal of the second inorganic light emitting element for the light source is supplied with a second potential lower than the first potential.
3. The display device according to claim 2 , wherein
the anode terminal of a second inorganic light emitting element for detection is supplied with the second potential, the second inorganic light emitting element for detection being configured to output a signal based on the second light incident on the second inorganic light emitting element for detection out of the second inorganic light emitting elements, and
the cathode terminal of the second inorganic light emitting element for detection is supplied with the first potential.
4. The display device according to claim 1 , wherein
the first inorganic light emitting elements and the second inorganic light emitting elements each comprise an anode terminal and a cathode terminal, and
the display device further comprises:
a first power supply line configured to supply a first potential to the second inorganic light emitting element;
a second power supply line configured to supply a second potential lower than the first potential to the second inorganic light emitting element;
a first switch element configured to switch between coupling destinations of the anode terminal of the second inorganic light emitting element to the first power supply line and to the second power supply line; and
a second switch element configured to switch between coupling destinations of the cathode terminal of the second inorganic light emitting element to the first power supply line and to the second power supply line.
5. The display device according to claim 4 , wherein
by operating the first switch element and the second switch element,
a single second inorganic light emitting element is switched between being a second inorganic light emitting element for a light source and being a second inorganic light emitting element for detection in a time-division manner, the second inorganic light emitting element for the light source being configured to output the second light, the second inorganic light emitting element for detection being configured to output a signal based on the second light incident on the second inorganic light emitting element for detection.
6. The display device according to claim 5 , wherein
the display device has a first detection mode and a second detection mode, the first detection mode and the second detection mode being different in number of the second inorganic light emitting elements for the light source and number of the second inorganic light emitting elements for detection,
the second inorganic light emitting elements for the light source and the second inorganic light emitting elements for detection are alternately arrayed in the first detection mode, and
the ratio of the number of the second inorganic light emitting elements for detection to the number of the second inorganic light emitting element for the light source is larger in the second detection mode than in the first detection mode.
7. The display device according to claim 3 , further comprising a detection circuit configured to detect a signal output based on light incident on the second inorganic light emitting element for detection.
8. The display device according to claim 1 , wherein a condenser lens is provided on the second inorganic light emitting element.
9. The display device according to claim 8 , wherein
the condenser lens is provided on the cathode electrode coupled to the first inorganic light emitting elements and the second inorganic light emitting elements, and
a structure having a height equal to a height of the condenser lens is provided in a region not overlapping the first inorganic light emitting element above the first inorganic light emitting element.
10. The display device according to claim 1 , further comprising:
a capacitive detection device provided on the first inorganic light emitting elements and the second inorganic light emitting elements and including a plurality of electrodes, wherein
the electrodes are provided in a region not overlapping the second inorganic light emitting element.
11. The display device according to claim 1 , further comprising a plurality of photoelectric conversion elements configured to output a signal based on the second light incident on the photoelectric conversion elements.
12. The display device according to claim 1 ,
the pixels are arranged in a first direction and a second direction crossing the first direction,
the pixels include:
first pixels each having the second light emitting element for the light source; and
second pixels each having the second light emitting element for detection, and
the first pixels and the second pixels are arranged alternately in the first direction and in the second direction.
13. A display device comprising:
a substrate;
a plurality of pixels provided to the substrate; and
a plurality of first inorganic light emitting elements and a plurality of second inorganic light emitting elements provided to the pixels, wherein
the first inorganic light emitting elements are configured to output first light in a visible light region,
the second inorganic light emitting elements are configured to output second light in an infrared light region, and
the second inorganic light emitting elements include:
a second light emitting element for a light source outputting the second light by being driven in forward bias; and
a second light emitting element for detection outputting signals based on the second light incident thereon by being driven in reverse bias,
the first inorganic light emitting elements and the second inorganic light emitting elements each comprise an anode terminal and a cathode terminal,
the display device further comprises:
a first power supply line configured to supply a first potential to the second inorganic light emitting element;
a second power supply line configured to supply a second potential lower than the first potential to the second inorganic light emitting element;
a first switch element configured to switch between coupling destinations of the anode terminal of the second inorganic light emitting element to the first power supply line and to the second power supply line; and
a second switch element configured to switch between coupling destinations of the cathode terminal of the second inorganic light emitting element to the first power supply line and to the second power supply line,
wherein
by operating the first switch element and the second switch element,
a single second inorganic light emitting element is switched between being a second inorganic light emitting element for a light source and being a second inorganic light emitting element for detection in a time-division manner, the second inorganic light emitting element for the light source being configured to output the second light, the second inorganic light emitting element for detection being configured to output a signal based on the second light incident on the second inorganic light emitting element for detection,
the display device has a first detection mode and a second detection mode, the first detection mode and the second detection mode being different in number of the second inorganic light emitting elements for the light source and number of the second inorganic light emitting elements for detection,
the second inorganic light emitting elements for the light source and the second inorganic light emitting elements for detection are alternately arrayed in the first detection mode, and
the ratio of the number of the second inorganic light emitting elements for detection to the number of the second inorganic light emitting element for the light source is larger in the second detection mode than in the first detection mode.