Abstract: A display device includes: a light guide that is curved; and an image light emitter that outputs image light to the light guide. Furthermore, the light guide includes: a first light guide layer; a second light guide layer; and an optical element that is disposed between the first light guide layer and the second light guide layer and diffracting and emitting light (image light) propagating in the first light guide layer and the second light guide layer. Moreover, the first light guide layer has a thickness less than a thickness of the second light guide layer.

Abstract: A method for projecting an image for a head-up display includes: emitting a light by a backlight; passing the light emitted by the backlight through a first light-transmissive member; passing the light transmitted through the first light-transmissive member through a light-diffusion structure; passing the light transmitted through the light-diffusion structure through a display screen; displaying an image on the display screen; and forming a virtual image corresponding to the image displayed on the display screen by reflecting the light transmitted through the display screen, in a target space.

Abstract: A projection device includes: a plurality of light sources arranged in a first direction; a spatial modulation element that modulates incident light into image information and emits the image information; a lens that changes an optical path of light emitted from each of the plurality of light sources such that the light emitted from each light source reaches substantially the same region of an incident surface of the spatial modulation element; and a first reflective optical member that deflects the light emitted from the lens toward the spatial modulation element, the first reflective optical member having a shape that reflects light emitted from the lens so as to be incident on an arbitrary point on the incident surface of the spatial modulation element at a predetermined reference incident angle.

Abstract: A display device incudes: an image generating device that generates light that indicates an image (image light); a first light guide that includes a first output hologram element from which the image light exits; and a second light guide that includes a second output hologram element from which the image light exits. Each of the first light guide and the second light guide is in a curved shape. The image light emitted from the image generating device enters the first light guide. A portion of the 10 image light that has entered the first light guide enters the second light guide. A light quantity distribution of the image light exiting the first output hologram element is different from a light quantity distribution of the image light exiting the second output hologram element.

Abstract: A display device displays a virtual image by projecting an image onto a windshield provided on a vehicle and having a curved shape. The display device includes: an image generation device that generates light (image light) representing an image; and a light guide that includes an emission hologram element having a non-rectangular quadrilateral shape. The emission hologram element emits, toward the windshield, the light representing the image and propagating through the light guide.

Abstract: Provided is a head-up display including a backlight configured to emit light, a light-diffusion member through which the light emitted by the backlight is transmitted, a Fresnel lens through which the light transmitted through the light-diffusion member is transmitted, a display screen through which the light transmitted through the Fresnel lens is transmitted, and a mirror that reflects the light transmitted through the light-diffusion member toward a target space.

Abstract: A projection device includes: a plurality of light sources arranged in a first direction; a spatial modulation element that modulates incident light into image information and emits the image information; a lens that changes an optical path of light emitted from each of the plurality of light sources such that the light emitted from each light source reaches substantially the same region of an incident surface of the spatial modulation element; and a first reflective optical member that deflects the light emitted from the lens toward the spatial modulation element, the first reflective optical member having a shape that reflects light emitted from the lens so as to be incident on an arbitrary point on the incident surface of the spatial modulation element at a predetermined reference incident angle.

Abstract: A display device includes a light guide body including first holographic optical element and a second holographic optical element, and an image light emitter that emits image light to the light guide body. In addition, the first holographic optical element includes a plurality of first cells for emitting first image light toward the second holographic optical element, the first image light being obtained by diffracting the image light propagating inside the light guide body. In addition, the second holographic optical element includes a plurality of second cells for emitting second image light obtained by diffracting the first image light propagating inside the light guide body. In addition, an arrangement of the plurality of first cells is different from an arrangement of the plurality of second cells.

Abstract: In a display device, an opening portion includes a first edge portion on a forward side and a second edge portion on a backward side of the opening portion in a traveling direction of a mobile object. When the display device is mounted on the mobile object, a line connecting an upper end of the first edge portion and a lower end of the second edge portion is taken as a reference line, and outside light that passes along the reference line and enters a light-transmissive member is taken as reference outside light, the reference outside light for the case where the opening portion is in a first position arrives at a lower position, at least partially in an optical path after the reference outside light is reflected at the light-transmissive member, than the reference outside light for the case where the opening portion is in the second position.

Abstract: A light guide includes: a holographic optical element that receives image light emitted from an image light emitter; and a light guide member that includes the holographic optical element. In an intensity distribution of the image light diffracted by and emitted from the holographic optical element, intensity is smaller in an end portion of the intensity distribution than in an intermediate portion of the intensity distribution.

Abstract: A light guide plate includes a first hologram element including a plurality of diffraction cells. At least one of edge lines of one diffraction cell among the plurality of diffraction cells included in the first hologram element is located at a position other than on extensions of all edge lines of an adjacent diffraction cell adjacent to the one diffraction cell, the adjacent diffraction cell being included in the plurality of diffraction cells.

Abstract: A light guide plate includes a hologram element that is a first hologram element including two or more diffraction cells, and a hologram element that is a second hologram element including a single diffraction cell.

Abstract: Provided is a head-up display including a backlight configured to emit light, a light-diffusion member through which the light emitted by the backlight is transmitted, a Fresnel lens through which the light transmitted through the light-diffusion member is transmitted, a display screen through which the light transmitted through the Fresnel lens is transmitted, and a mirror that reflects the light transmitted through the light-diffusion member toward a target space.

Abstract: A display device according to the present disclosure includes a display member, a light transmission member, a light diffusion member, and a plurality of protrusions. The display member has a display surface. The light transmission member is disposed on the display surface side of the display member, has a first surface on a side opposite to the display member and a second surface on the display member side, and has light transparency. The light diffusion member is disposed on a side opposite to the display surface of the display member, and has light diffusion. The plurality of protrusions is provided between the light transmission member and the display member.

Abstract: A projection device includes: a plurality of light sources arranged in a first direction; a spatial modulation element that modulates incident light into image information and emits the image information; a lens that changes an optical path of light emitted from each of the plurality of light sources such that the light emitted from each light source reaches substantially the same region of an incident surface of the spatial modulation element; and a first reflective optical member that deflects the light emitted from the lens toward the spatial modulation element, the first reflective optical member having a shape that reflects light emitted from the lens so as to be incident on an arbitrary point on the incident surface of the spatial modulation element at a predetermined reference incident angle.

Abstract: A head-up display includes a liquid-crystal panel including a display screen provided at a front surface thereof, a Fresnel lens which is on an opposite side of the liquid-crystal panel from the display screen, a light-diffusion structure between the liquid-crystal panel and the Fresnel lens, a backlight that emits light toward the Fresnel lens, a light-transmissive member between the backlight and the Fresnel lens, a body part accommodating the Fresnel lens, and a mirror that forms a virtual image corresponding to an image displayed on the display screen of the liquid-crystal panel, in a target space. The body part has a step-shaped structure including a first step surface and a second step surface, the first and second step surfaces are oriented in the same direction as the front surface of the liquid-crystal panel. The first step surface is located on the liquid-crystal panel side from the second step surface.

Abstract: A projection device includes: a plurality of light sources arranged in a first direction; a spatial modulation element that modulates incident light into image information and emits the image information; a lens that changes an optical path of light emitted from each of the plurality of light sources such that the light emitted from each light source reaches substantially the same region of an incident surface of the spatial modulation element; and a first reflective optical member that deflects the light emitted from the lens toward the spatial modulation element, the first reflective optical member having a shape that reflects light emitted from the lens so as to be incident on an arbitrary point on the incident surface of the spatial modulation element at a predetermined reference incident angle.

Abstract: Provided is a head-up display including a liquid-crystal panel including a display screen, a Fresnel lens which is on an opposite side of the liquid-crystal panel from the display screen, a light-diffusion structure between the liquid-crystal panel and the Fresnel lens, and a mirror that forms a virtual image corresponding to an image displayed on the display screen of the liquid-crystal panel, in a target space, where the light-diffusion structure is thinner than the Fresnel lens, and the light-diffusion structure has a thickness equal to or smaller than 300 ?m.

Abstract: Provided is a head-up display including a display system that has a liquid-crystal panel including a display screen, a Fresnel lens which is on an opposite side of the liquid-crystal panel from the display screen, and a backlight that emits light toward the Fresnel lens. The head-up display also includes a first mirror that reflects light from the display system, a second mirror that reflects light from the first mirror, and a control circuit that controls the liquid-crystal panel, where a center of the second mirror is closer to a center of the control circuit than a center of the display system in a direction connecting a center of the first mirror and the center of the second mirror.

Abstract: Provided is a head-up display including a liquid-crystal panel including a display screen, a Fresnel lens which is on an opposite side of the liquid-crystal panel from the display screen, a light-diffusion structure between the liquid-crystal panel and the Fresnel lens, a backlight that emits light toward the light-transmissive member, and a mirror that forms a virtual image corresponding to an image displayed on the display screen of the liquid-crystal panel, in a target space, where the light-diffusion structure includes a plurality of fine particles and an average particle size of the plurality of fine particles is equal to or smaller than 20 um.