Abstract: A head-mounted display according to the present embodiment includes a reflective member arranged in front of a user and configured to reflect at least part of display light for forming a display image toward the user, and a beam splitter arranged between the reflective member and an eye of the user and configured to reflect the display light toward the reflective member and to transmit the display light that has been reflected by the reflective member, in which transmittance of the beam splitter in a direction from a first position above the eye of the user toward the eye is equal to transmittance of the beam splitter in a direction from a second position below the eye of the user toward the eye.

Abstract: A fluorescent substance is irradiated with laser light and emits illumination light of a prescribed color. A condenser lens collects the illumination light. A moving mechanism moves the fluorescent substance in a direction toward the condenser lens and in a direction away from the condenser lens. An image display element generates image light by modulating the illumination light according to an image. A light quantity adjustment mechanism adjusts the quantity of the image light by changing the size of an opening through which the illumination light or the image light passes in order to adjust the contrast of a projected image. A controller controls the moving mechanism such that the distance between the fluorescent substance and the condenser lens is a distance in association with an F-number corresponding to the adjustment state of the quantity of the image light implemented by means of the light quantity adjustment mechanism.

Abstract: A first illumination light source emits a first illumination light ray which is a first polarized light. Either one of an s-polarized light and a p-polarized light, which are linearly polarized light, is the first polarized light and the other is a second polarized light. A second illumination light source emits a second illumination light ray. A dichroic mirror includes a specific polarization reflection area and a transmission area. The specific polarization reflection area reflects the first polarized light and transmits the second polarized light and the second illumination light ray. The transmission area transmits the first and second illumination light rays. A phase difference plate converts linearly polarized light into circularly polarized light. A polarization conversion element transmits either the first or second polarized light, shifts an optical axis of the other, and aligns the first and second illumination light rays to the first or second polarized light.

Abstract: A step difference exists at a boundary between lens cells in a first direction of a fly-eye lens, whereas a step difference does not exist at a boundary between lens cells in a second direction. Central light transmitted though a central portion of the lens cell in the first direction is incident on a polarized light separation surface of a polarized light conversion element, and the polarized light separation surface reflects a first polarized light included in the central light and transmits a second polarized light. A reflection surface reflects the reflected first polarized light and causes the polarized light conversion element to emit the reflected first polarized light, and a ½ wavelength plate converts the second polarized light transmitted through the polarized light separation surface into the first polarized light and causes the polarized light conversion element to emit the converted first polarized light.

Abstract: Divided periods by dividing a frame of a video signal are produced. A display element is ON-OFF controlled on a pixel-by-pixel basis according to a video signal in accordance with the divided periods preassigned to each gradation. The light amount of a light source for emitting light to the display element is controlled so that a first light amount in a first divided period corresponding to the lowest gradation except black display becomes a light amount lower than a second light amount in a second divided period other than the first divided period.

Abstract: A light source device includes a blue laser light module that emits a blue laser light, and a dichroic mirror including an incident surface, and that reflects the incident blue laser light in a second direction different from a first direction which is an emission direction of the blue laser light so as to introduce the blue laser light into a fluorescent body, and allow part of light excited by the fluorescent body and emitted in a direction opposite to the second direction to penetrate through the dichroic mirror. The incident surface is provided with a dichroic coat region coated with a dichroic coat so as to reflect the blue laser light, and the dichroic coat region is formed on the incident surface such that a length in a direction orthogonal to the first direction is longer as a distance from the blue laser module is farther.

Abstract: A light source device includes a blue laser light module that emits a blue laser light, and a dichroic mirror including an incident surface, and that reflects the incident blue laser light in a second direction different from a first direction which is an emission direction of the blue laser light so as to introduce the blue laser light into a fluorescent body, and allow part of light excited by the fluorescent body and emitted in a direction opposite to the second direction to penetrate through the dichroic mirror. The incident surface is provided with a dichroic coat region coated with a dichroic coat so as to reflect the blue laser light, and the dichroic coat region is formed on the incident surface such that a length in a direction orthogonal to the first direction is longer as a distance from the blue laser module is farther.

Abstract: A first image display element modulates first illumination light in which red illumination light and infrared illumination light are alternately switched, based on an image signal for visible light image and an image signal for infrared light image, and emits first image light in which red image light and infrared image light are alternately switched. A second image display element modulates green illumination light based on a green image signal, and emits green image light. A third image display element modulates blue illumination light based on a blue image signal, and emits blue image light. A synthesizer synthesizes the first image light, the green image light, and the blue image light with one another, and obtains synthesized image light. A projection unit projects the synthesized image light.

Abstract: A step difference exists at a boundary between lens cells in a first direction of a fly-eye lens, whereas a step difference does not exist at a boundary between lens cells in a second direction. Central light transmitted though a central portion of the lens cell in the first direction is incident on a polarized light separation surface of a polarized light conversion element, and the polarized light separation surface reflects a first polarized light included in the central light and transmits a second polarized light. A reflection surface reflects the reflected first polarized light and causes the polarized light conversion element to emit the reflected first polarized light, and a ½ wavelength plate converts the second polarized light transmitted through the polarized light separation surface into the first polarized light and causes the polarized light conversion element to emit the converted first polarized light.

Abstract: A first image display element modulates first illumination light in which red illumination light and infrared illumination light are alternately switched, based on an image signal for visible light image and an image signal for infrared light image, and emits first image light in which red image light and infrared image light are alternately switched. A second image display element modulates green illumination light based on a green image signal, and emits green image light. A third image display element modulates blue illumination light based on a blue image signal, and emits blue image light. A synthesizer synthesizes the first image light, the green image light, and the blue image light with one another, and obtains synthesized image light. A projection unit projects the synthesized image light.

Abstract: A projection display device includes: a light source device which emits source light; a first polarizer passes the source light in a first polarization state; a reflective liquid crystal panel; an illumination optical system which causes the source light to be incident to the reflective liquid crystal panel; a second polarizer passes the source light in the first polarization state from the first polarizer, and reflects the source light in a second polarization state from the reflective liquid crystal panel; a projection optical system which projects the source light reflected by the second polarizer; a support member which includes an outer member that supports the first polarizer and the reflective liquid crystal panel and an inner member that is fixed to the outer member in an internal space of the outer member and supports the second polarizer; and a seal mechanism which seals the internal space.

Abstract: A projection image display device includes: a light source that emits a blue illumination light; a phosphor that produces, in a region irradiated by the blue illumination light, a yellow illumination light including a component in a red band and a component in a green band from a portion of the blue illumination light and that reflects the blue illumination light and the yellow illumination light; and a filter that reflects a portion of the blue illumination light reflected by the phosphor toward the phosphor. The filter reflects the portion of the blue illumination light so as to be imaged at a position displaced from a region on a phosphor surface irradiated by the blue illumination light, and the phosphor produces a yellow illumination light also from the blue illumination light reflected by the filter.

Abstract: A light emitting device includes a light source which emits source light having a first wavelength, a fluorescent substance which excites fluorescent light having a second wavelength by the source light and emits the source light and the fluorescent light as illumination light, a fly-eye lens, and a light shielding unit. In the illumination light, a first wavelength component in a first region which is a portion of a region in a cross-sectional view with respect to the traveling direction of the light is smaller than that in a second region which is a region other than the first region. The light shielding unit includes a diaphragm unit which shields the illumination light L and a filter which shields the light having the second wavelength of the illumination light in the second region and transmits the light having the first wavelength of the illumination light in the second region.

Abstract: A projection-type image display device includes a light source, a phosphor, a filter, and a filter driver. The light source emits blue illumination light. The phosphor generates yellow illumination light, which includes red illumination light and green illumination light from a part of the blue illumination light, and reflects the blue illumination light and the yellow illumination light. The filter reflects the blue illumination light, which is reflected by the phosphor, toward the phosphor, and transmits the yellow illumination light therethrough. The filter driver controls the reflection amount of the blue illumination light toward the phosphor by controlling the insertion amount of the filter onto the optical path of the blue illumination light. The phosphor generates yellow illumination light also from the blue illumination light reflected by the filter.

Abstract: A projection display device includes a plurality of reflective liquid crystal panels, a plurality of polarizers, and a combining optical system. The combining optical system includes a first incident surface to which first color light emitted from a first reflective liquid crystal panel and reflected by a combining surface of the combining optical system is incident and a second incident surface to which second color light emitted from a second reflective liquid crystal panel and passing through the combining surface is incident. The polarizes include a first polarizer, which reflects the first color light to the first incident surface, and a second polarizer which reflects the second color light to the second incident surface. An alignment direction of the liquid crystal of the first reflective liquid crystal panel is orthogonal to an alignment direction of the liquid crystal of the second reflective liquid crystal panel.

Abstract: A light source device includes: a light source including a laser; a dispersing member disposed on a path of a laser beam emitted by the laser, and configured to disperse the laser beam into a plurality of dispersed beams with peak intensities lower than a peak intensity of the laser beam to emit the dispersed beams; and an optical component disposed on paths of the dispersed beams.

Abstract: In a display element, each pixel is controlled to an ON state and OFF state in accordance with a video signal. Each pixel of the display element is controlled to an OFF state in a first period shorter than a predetermined frame period, the first period including at least one of a front end and a rear end of the frame period of the video signal. In addition, light emission of a light source that emits light on the display element is stopped in a second period including the first period.

Abstract: An optical device according to an embodiment includes a first birefringent element on which coherent incident light is incident, a transmissive diffusing element on which light emitted from the first birefringent element is incident, and a second birefringent element on which light emitted from the transmissive diffusing element is incident. Light emitted by a laser light source is incident on the first birefringent element and the incident light is separated into two lights by birefringence to be incident on the diffusing element. The diffusing element diffuses the two lights to emit. The second birefringent element synthesizes the two lights emitted from the diffusing element into one light to emit.

Abstract: Provided are: a light source device; first, second, and third color separation elements; first, second, and third reflective members which reflect first, second, and third color light in a third direction; first, second, and third reflective liquid crystal panels which optically modulate the first, second, and third color light; a combining optical system which combines the optically modulated first, second and third color light to generate combined light; a projection optical system which projects the combined light; and a relay optical system which is arranged in an optical path of the first color light between the first color separation element and the first reflective liquid crystal panel and forms an erect image.

Abstract: A projection-type image display device includes a light source, a phosphor, a filter, and a filter driver. The light source emits blue illumination light. The phosphor generates yellow illumination light, which includes red illumination light and green illumination light from a part of the blue illumination light, and reflects the blue illumination light and the yellow illumination light. The filter reflects the blue illumination light, which is reflected by the phosphor, toward the phosphor, and transmits the yellow illumination light therethrough. The filter driver controls the reflection amount of the blue illumination light toward the phosphor by controlling the insertion amount of the filter onto the optical path of the blue illumination light. The phosphor generates yellow illumination light also from the blue illumination light reflected by the filter.