Abstract: A micro light-emitting diode includes a first micro light-emitting diode including a first light-emitting layer and emitting light at a first wavelength, and a second micro light-emitting diode including the first light-emitting layer and a second light-emitting layer emitting light at a second wavelength longer than the first wavelength, in which the second light-emitting layer is a nitride semiconductor layer doped with a second rare earth element, and a nitride semiconductor of the first micro light-emitting diode and the nitride semiconductor of the second micro light-emitting diode are separated from each other.

Abstract: An image display device includes a plurality of micro light-emission elements that constitute a pixel and that are provided on a driving circuit substrate. The micro light-emission element displays an image by emitting light to a side opposite to the driving circuit substrate. A light convergence portion that converges light is disposed in the pixel.

Abstract: An N electrode and a P electrode formed on the same surface are respectively bonded to a cathode electrode and an anode electrode of a drive circuit board through a connection step performed once. An LED unit includes a first wiring (21) that is disposed inside a groove formed in a nitride semiconductor (13) to penetrate between an N-type layer (10) and a P-type layer (12) and is electrically connected to the N-type layer (10), and a second wiring that includes a P electrode (30) connected to the P-type layer (12) and an N electrode (31) connected to the first wiring (21), in which the N electrode (31) and the P electrode (30) are formed on the same surface.

Abstract: A micro-LED element includes a nitride semiconductor layer in which an N-type layer, a light-emitting layer, and a P-type layer are stacked in this order when viewed from a light emission surface side; and a P-side electrode layer formed on the P-type layer side. The N-type layer includes a first region in contact with the light-emitting layer and a second region including the light emission surface. An angle between a first interface surrounding at least a side of the first region in the nitride semiconductor layer and the light-emitting layer is a prescribed first angle at which light propagating in a direction along the light-emitting layer is reflected in a direction toward the light emission surface. An angle between a second interface surrounding a side of the second region in the nitride semiconductor layer and the light-emitting layer is a prescribed second angle larger than the first angle.

Abstract: Light irradiation that is suitable for treatment for a relatively small diseased part and is performed almost uniformly and efficiently for the entirety of an affected part even when the affected part is not flat is realized. Light output from a plurality of LED chips includes first wavelength region light whose light-emission intensity peak is in a wavelength range of 380 nm or more and 430 nm or less and second wavelength region light whose light-emission intensity peak is in a wavelength range of more than 430 nm and 635 nm or less, and a group of LED light sources has uniform in-plane intensity of light irradiation.

Abstract: A light irradiation substrate is provided which can cope with cases of emergency and which is capable of optimum irradiation with therapeutic light regardless of the shape or size of affected parts while keeping a lid on cost. The center-to-center distance between two adjacent LED chips (13) facing each other across the boundary between two unit substrates (7) adjacent to each other in an X direction or (a Y direction) and belonging to the respective unit substrates (7) is twice or less as long as the center-to-center distance between two LED chips (13) adjacent to each other in the X direction (or the Y direction) within each of the unit substrates (7). Each of the unit substrates (7) includes a connection section (10) that provides external connection of wires (12). The connection section (10) is provided on a back surface of a flexible substrate (6).

Abstract: A three-dimensional image element and an optical radar device that have low cost and are capable of detecting a distance to a measurement object at a close distance before a final result of counting the number of pulses is acquired are realized. A pixel storage element has a plurality of binary counters that integrate the number of electrical pulses at mutually different timings and the reading of data by a signal processing circuit and the integration are able to be performed in parallel.

Abstract: An object of the present invention is to provide a photodynamic therapy light irradiation device for irradiating two kinds of light in different wavelength ranges to an irradiated surface, the device being capable of irradiating the light with uniform illuminance to the irradiated surface even having an uneven shape and obtaining a spectral distribution of high uniformity on the entire irradiated surface. A photodynamic therapy light irradiation device of the present invention is characterized by including: a light source unit having one or more LED elements that emit first light having a peak wavelength within a range of wavelengths of not shorter than 400 nm to not longer than 420 nm disposed on a flexible substrate; and a fluorescent plate configured to transmit a part of the first light from the light source unit, and to convert another part thereof into second light having a wavelength of not shorter than 500 nm to not longer than 520 nm and thereby emit the second light.

Abstract: In a micro light emitting element, a first metal film electrically connected to a second conductive layer is disposed on a surface on an opposite side of a light emitting surface side. The first metal film covers the second conductive layer. A first inclined angle of a first conductive layer side surface from a slope formed around a light emission layer to the light emitting surface is larger than a second inclined angle of the slope. The slope and the first conductive layer side surface are covered together by a second metal film. A first transparent insulating film is disposed between the slope and the second metal film.

Abstract: Provided is a simple light irradiation apparatus capable of performing uniform irradiation even on to a treatment area having a curved surface and capable of suppressing excessive heating caused by light irradiation. The light irradiation apparatus (10) includes a polymer gel layer (3) that covers the treatment area (2) on skin (1), an LED protective layer (6) that closely adheres to the polymer gel layer (3), and a substrate (5) on which LEDs (4) closely adhered to the LED protective layer (6) are arranged thereon. A current control apparatus (8) which lights the LEDs (4) controls irradiation intensity and stops irradiation when reaching a demanded dose amount.

Abstract: An object is to realize a low-cost three-dimensional image sensor capable of providing a wide measurement range. The three-dimensional image sensor includes a light receiving unit including a plurality of pixels each including an SPAD (single-photon avalanche photodiode) configured to detect, in Geiger mode, a photon of incident light including reflected light from an object to be detected, a plurality of pixel storage elements provided for the respective pixels in a one-to-one manner, each pixel storage unit being configured to count a accumulated value of pulse signals output from a corresponding one of the pixels as a result of detecting photons for each of temporally successive time intervals, and a signal processing circuit (DS) configured to calculate distance information regarding a distance between a light receiving unit and an object for each pixel by using groups of accumulated values accumulated by the pixel storage elements.

Abstract: Provided is an imaging device that is able to obtain a clear image in a relatively long distance in an environment of precipitation. A rainy weather camera includes: a light source that emits pulse light; a fan-shaped pulse light radiation unit that performs scanning in one direction with the pulse light emitted by the light source, spreads, in a direction perpendicular to the scanning direction, the pulse light for the scanning when the scanning is performed, and radiates the pulse light, which is in a state of being polarized in the direction perpendicular to the scanning direction, to an object; an imaging unit that receives reflection light from the object and performs exposure to a pixel; and a polarization filter that transmits light that is included in the reflection light received by the imaging unit and polarized to be parallel to the scanning direction. The imaging unit performs exposure only to a pixel which is synchronized with the scanning with the pulse light.

Abstract: In a pixel, at least two sets of a pair of wiring lines, that is connected to a pair of electrodes of a micro-LED and is coupled to a pixel circuit, are disposed, the pixel circuit has a first LED drive circuit that supplies a current to the micro-LED and a second LED drive circuit that substitutes for the first LED drive circuit, and the pixel circuit also has a switching device that short-circuits the pair of wiring lines.

Abstract: 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.

Abstract: A base substrate include a first substrate (110) having a first principal surface (110a) and a second principal surface (110b), and a first wiring member placed over the first or second principal surface. A pixel substrate includes a second substrate (201) having a third principal surface (201a) and a fourth principal surface (201b), a plurality of light-emitting elements (202) mounted over the third principal surface, a driver IC (205) mounted over the third principal surface, an external connection terminal mounted over the third principal surface, and a second wiring member (206) placed on the third or fourth principal surface. The driver IC drives the plurality of light-emitting elements. The external connection terminal receives an input signal that is supplied from outside the pixel substrate. The second substrate (201) is disposed to be stacked on top of the first substrate (110) so that the first principal surface and the fourth principal surface face each other.

Abstract: Provided is an image display device including a micro light emission element that is connected onto a drive circuit substrate incorporating a drive circuit of the micro light emission element. The micro light emission elements has a light emission surface on an opposite side to a bonding surface with the drive circuit, at least one of a surface on a connecting surface side of the micro light emission element and a surface on a connecting surface side of the drive circuit substrate has a protrusion portion and a recess portion, an electrode of the micro light emission element and an electrode of the drive circuit substrate side are connected to each other via a metal nanoparticle, and a space formed between the surface on the connecting surface side of the micro light emission element and a side of the surface on the connecting surface of the drive circuit substrate is filled with a photo-curing resin.

Abstract: A three-dimensional display includes a plurality of micro-projectors, each of which including a display element and a projection optic, and a micro-lens array, and each micro-projector projects a display image displayed by the display element onto the micro-lens array through the projection optic and the display element includes a drive circuit substrate and a plurality of micro light emission elements formed on a surface on one side of the drive circuit substrate.

Abstract: Provided is a micro light emission element including a compound semiconductor in which an N-side layer, a light emission layer, and a P-side layer are laminated sequentially from a side of a light emitting surface, in which an N-electrode coupled to the N-side layer and a P-electrode coupled to the P-side layer are disposed on another surface opposite to the light emitting surface, the P-electrode is disposed on the light emission layer, the N-electrode is disposed in an isolation region which is a boundary region of the micro light emission element and isolates the light emission layer from a light emission layer of another micro light emission element, a surface of the N-electrode on a side of the other surface and a surface of the P-electrode on the side of the other surface are flush with each other, and the N-electrode and the P-electrode are both formed of a single interconnection layer.

Abstract: A light irradiation substrate includes plural unit substrates that have a flexible substrate. A portion of the unit substrates have a pair of external connection portions. A first surface of the flexible substrate is provided with an LED chip and a wire for each of the unit substrates, and a second surface is provided with a back surface wire across the unit substrates.

Abstract: Provided is a non-mechanical-scanning-type optical radar apparatus that is capable of long distance measurement and its cost is reduced. The optical radar apparatus includes: a light emitting section; and a light receiving system, the light receiving system at least including a focusing optical element and a distance sensor that includes a light receiver, the target field of view being projected on the light receiver through the focusing optical element, the distance sensor being configured to set an activation region in a part of the light receiver depending on the scanning with the light and measure a distance to the object with use of a signal from the activation region.