Provided is an optical device, a method for manufacturing the same, and a display device. The optical device includes a chip substrate and a quantum dot film. The quantum dot film includes a quantum dot functional layer, a first package substrate, a second package substrate, and a prism structure and/or a uniform-light diffusing film.

A lighting device 1 includes a circuit board that is long and flexible, light emitters mounted in a row on the circuit board, and an elongated cover. The cover includes (i) a translucent member that is made of translucent soft material and that covers the circuit board and the light emitters, and (ii) a phosphorescent member containing a phosphorescent material that is to be excited by light emitted by the light emitters. The phosphorescent member is arranged on a second area portion of the cover other than a first area portion of the cover that is located in an emission direction of light from each of the light emitters and a luminous intensity is equal to or greater than a standard luminous intensity in the emission direction.

A light emitting device includes a light emitting diode (LED); a transparent optic having a refractive index n.sub.optic; and a phosphor layer spaced apart from the LED and positioned between the LED and the transparent optic. The phosphor layer has an effective refractive index n.sub.phosphor, where a gap between the LED and the phosphor layer has a refractive index n.sub.gap that is less than n.sub.phosphor. The transparent optic has an inner convex surface in contact with the phosphor layer. The inner convex surface has an inner radius of curvature r; and an outer convex surface facing away from the phosphor layer and being a surface through which the light emitting device emits light into a medium adjacent the outer convex surface. The medium has a refractive index n.sub.medium. The outer convex surface has an outer radius of curvature R, such that r/R is equal to n.sub.medium/n.sub.optic.

A light emitting device includes a light emitting diode (LED); a transparent optic having a refractive index n.sub.optic; and a phosphor layer spaced apart from the LED and positioned between the LED and the transparent optic. The phosphor layer has an effective refractive index n.sub.phosphor, where a gap between the LED and the phosphor layer has a refractive index n.sub.gap that is less than n.sub.phosphor. The transparent optic has an inner convex surface in contact with the phosphor layer. The inner convex surface has an inner radius of curvature r; and an outer convex surface facing away from the phosphor layer and being a surface through which the light emitting device emits light into a medium adjacent the outer convex surface. The medium has a refractive index n.sub.medium. The outer convex surface has an outer radius of curvature R, such that r/R is equal to n.sub.medium/n.sub.optic.

A light emitting device includes a semiconductor light emitting element to emit an excitation light, a wavelength converting member to emit fluorescent light upon being irradiated with the excitation light, a package supporting the semiconductor light emitting element and the wavelength converting member, and a first photodetector configured to detect the excitation light and a second photodetector to detect the fluorescent light, located in the package.

A light emitting device includes a semiconductor light emitting element to emit an excitation light, a wavelength converting member to emit fluorescent light upon being irradiated with the excitation light, a package supporting the semiconductor light emitting element and the wavelength converting member, and a first photodetector configured to detect the excitation light and a second photodetector to detect the fluorescent light, located in the package.

A light device for a vehicle includes an enclosure having a transmissive portion configured to transmit light generated within the enclosure. A matrix material is contained within the enclosure and includes quantum dots dispersed throughout the matrix material. An energy source is configured to couple energy to the quantum dots such that the quantum dots emit light that is transmitted through the transmissive portion of the enclosure.

Provided is a partial drive-type light source device including an excitation light source that is formed from a plurality of light-emitting elements and is partially drivable, a phosphor sheet disposed at a position separated from the excitation light source and containing a phosphor that converts at least part of a wavelength region of incident light from the excitation light source and releases emitted light in a wavelength region differing from the incident light, and a wavelength-selective reflection film that is disposed between the excitation light source and the phosphor sheet and that transmits at least part of light in the wavelength region of the incident light from the excitation light source and reflects at least part of light in the wavelength region of the emitted light from the phosphor sheet.

An LED light bulb, comprising: a lamp housing, a bulb base, connected with the lamp housing; a stem with a stand extending to the center of the lamp housing, disposed in the lamp housing; a single flexible LED filament, disposed in the lamp housing, and the flexible LED filament comprising: two LED sections, each of the LED sections comprising a least one LED chip; one conductive section comprising a conductor, located between the adjacent two LED sections; two conductive electrodes, disposed corresponding to the two LED sections and electrically connected to the two LED sections, wherein points of the flexible LED filament in an xyz coordinates are defined as X, Y, and Z, an x-y plane of the xyz coordinates is perpendicular to the height direction of the light bulb, a z-axis of xyz coordinates is parallel with the stem, and the main bending points of the LED sections and the conductive electrodes are substantially on the circumference centered on the conductive section in the XY plane.

A display apparatus includes: a display panel; a light source configured to supply light to the display panel; and a diffuser plate configured to diffuse the light supplied to the display panel. The diffuser plate includes: a first diffusion layer comprising a plurality of concave portions in a first surface of the first diffusion layer; a light converter provided in each concave portion of the plurality of concave portions; and a second diffusion layer configured to cover the first surface of the first diffusion layer.