Abstract: A head-up display includes an optical system that radiates light forming a projected image toward an eye box. The eye box is a predetermined range in which eyes of an observer are assumed to be present. The optical system includes a Fresnel lens having a bumpy surface having a sawtooth-shaped cross-section. The bumpy surface is formed concentrically around an optical axis, and formed by alternately disposing first surfaces as light condensing surfaces that allow incident light to converge toward a focal point, and second surfaces as wall surfaces that do not allow the incident light to converge toward the focal point. The second surfaces are inclined with respect to the optical axis of the Fresnel lens at an angle to reflect the incident light striking the wall surfaces, in a direction toward outside of a range of the eye box.

Abstract: A display device is provided and may include a light source that emits a light beam, a scanner that causes the light beam to scan, a movable screen in which an image is formed by transmitting the light beam from scanner, an optical system configured to project the image on a display medium, and a driver configured to cause the movable screen to reciprocate in moving directions. The image includes a first image and a second image. The movable screen reciprocates in a posture inclined with respect to the moving directions such that a second end of the movable screen is positioned closer to the scanner than a first end of the movable screen. The scanner forms the second image in the movable screen while the movable screen moves such that a forming direction of the second image is inclined with respect to a direction approaching the scanner.

Abstract: A display device is provided and may include a light source that emits a light beam, a scanner that causes the light beam to scan, a movable screen in which an image is formed by transmitting the light beam from scanner, an optical system configured to project the image on a display medium, and a driver configured to cause the movable screen to reciprocate in moving directions. The image includes a first image and a second image. The movable screen reciprocates in a posture inclined with respect to the moving directions such that a second end of the movable screen is positioned closer to the scanner than a first end of the movable screen. The scanner forms the second image in the movable screen while the movable screen moves such that a forming direction of the second image is inclined with respect to a direction approaching the scanner.

Abstract: Head-up display includes display device and projection optical system. Display device displays an image. Projection optical system includes refraction lens. Projection optical system projects the image displayed on display device to an observer. Refraction lens is disposed while inclined with respect to a reference beam. An incident surface of refraction lens is a concave surface relative to a side of display device in an X-axis direction. A curvature in a Y-axis direction of the incident surface is smaller than a curvature in the X-axis direction.

Abstract: A display device displays a virtual image of a first picture and a virtual image of a second picture by using a display medium. This display device includes a light source that emits light, a fixed screen, a movable screen, a driver, and a scanner. The fixed screen is fixedly disposed on an optical path between the light source and the display medium. The movable screen is also disposed on this optical path. The driver moves the movable screen along the optical path. The scanner scans the fixed screen and the movable screen with the light emitted from the light source, thereby forming the first picture on the fixed screen and the second picture on the movable screen.

Abstract: A head-up display includes a display device and a projection optical system. The projection optical system has a lens group including at least one lens element and projects onto a reflecting member an image displayed on the display device. The lens group includes a drive lens that shifts along an optical path to change its distance from the display device.

Abstract: A display apparatus includes a display unit that projects an image to a light transmissive display member. The display unit is configured to accommodate a display device and a projection optical system that projects the image displayed on the display device to the display member in a housing including an opening through which projected light is output. The projection optical system includes a first reflecting member disposed on a display device side and a second reflecting member disposed on an opening side in an optical path extending from the display device to the opening. A reflection surface of the first reflecting member that reflects the image displayed on the display device has a convex shape of a free-form surface, and a reflection surface of the second reflecting member that projects the image to the display member has a concave shape of a free-form surface.

Abstract: The present invention provides a display device that can easily perform control for driving a movable screen. Display device includes light source that emits a light beam, scanner that causes the light beam from light source to scan, movable screen in which a first image is formed by transmitting the light beam from scanner, projection unit that projects the first image formed in movable screen on windshield and displays a virtual image of the first image in a space in front of windshield, and driver that causes movable screen to reciprocate in a first direction separating from scanner and in a second direction approaching scanner. Movable screen reciprocates in a posture inclined to moving directions of movable screen.

Abstract: A display system includes an image producing unit, a projection unit and an adjustment unit. The image producing unit has a display surface, and is configured to produce an image on the display surface. The projection unit is configured to project a virtual image to a target space with an output light of the image producing unit. The virtual image corresponds to the image produced by the image producing unit. The display system is configured to change a visual distance between an eye-box and the virtual image. The adjustment unit is configured to adjust brightness of the virtual image according to the visual distance.

Abstract: In a display device, an irradiation unit includes an imaging optical system. The imaging optical system scans and irradiates a front surface of a screen with light to form an image. The light passing through the screen and output from the screen in a movement direction is incident on a projection unit as incident light. The projection unit irradiates a reflective member with the incident light to allow the reflective member to reflect the incident light to form a virtual image corresponding to the image in a target space. A locus of a focal position of the imaging optical system when the irradiation unit wholly scans the front surface of the screen is within a range between the front surface of the screen at a first position and the front surface of the screen at a second position.

Abstract: A head-up display projects an image on a windshield to allow a viewer to visually observe a virtual image. The head-up display includes a display device, a relay optical system, and a projection optical system. The display device displays an image. The relay optical system provides the image displayed by the display device as an intermediate image. The projection optical system reflects the intermediate image provided by the relay optical system to project the intermediate image on the windshield.

Abstract: A head-up display is mounted to a vehicle having a windshield, and includes a display element configured to display an image, a first optical system configured to reflect the image displayed by the display element and project the image onto the windshield; and a second optical system configured to reflect the image displayed by the display element and project the image onto the windshield. The image projected with the first optical system is projected onto the windshield at a position below a position of the image projected with the second optical system.

Abstract: A refractive optical system is disposed in an optical path from a display surface to a viewing area and between a projection optical system and the viewing area. A housing receives a display device, the projection optical system, and the refractive optical system, and is provided with an opening. An opening cover has at least partially a curved portion, and is disposed in the opening so that light emitted from the display surface is incident on a convex side of the curved portion. When a light beam that is emitted from a center of the display surface and reaches a center of the viewing area is referred to as a reference light beam, a head-up display satisfies the following condition (1): L2?L1??(1) where L1 is a distance from an end on the anterior side of the observer of the refractive optical system to the opening cover, and L2 is a distance from a position at which the reference light beam passes through the refractive optical system to the opening cover.

Abstract: The present invention provides a Fresnel lens that can reduce generation of concentric stray light. The Fresnel lens includes a sawtooth corrugated face that is formed by alternately disposing a first face inclined relative to optical axis A and a second face substantially parallel to optical axis A, and a light shielding mask is formed at a position corresponding to the second face.

Abstract: A head-up display includes a display device that displays an image toward a vertically downward direction, a first mirror that reflects the image to output reflected light toward a vertically upward direction, and a second mirror that reflects the reflected light from the first mirror to output reflected light toward a vertically upward direction. A vehicle includes the head-up display, and a windshield that reflects the reflected light emitted from the head-up display.

Abstract: Head-up display includes display device and projection optical system. Display device displays an image. Projection optical system includes refraction lens. Projection optical system projects the image displayed on display device to an observer. Refraction lens is disposed while inclined with respect to a reference beam. An incident surface of refraction lens is a concave surface relative to a side of display device in an X-axis direction. A curvature in a Y-axis direction of the incident surface is smaller than a curvature in the X-axis direction.

Abstract: Head-up display includes display device, projection optical system, a polarization member, and a first polarizer. Display device displays an image. Projection optical system includes refraction lens. Projection optical system projects the image displayed on display device to an observer. The polarization member is disposed between projection optical system and a reflection member that reflects light from projection optical system. Transmittance of the polarization member depends on a polarization direction of transmitted light. The first polarizer is disposed behind refraction lens on an optical path starting from display device. The first polarizer rotates a predetermined polarized component by a quarter of wavelength.

Abstract: A head-up display includes an optical system that radiates light forming a projected image toward an eye box. The eye box is a predetermined range in which eyes of an observer are assumed to be present. The optical system includes a Fresnel lens having a bumpy surface having a sawtooth-shaped cross-section. The bumpy surface is formed concentrically around an optical axis, and formed by alternately disposing first surfaces as light condensing surfaces that allow incident light to converge toward a focal point, and second surfaces as wall surfaces that do not allow the incident light to converge toward the focal point. The second surfaces are inclined with respect to the optical axis of the Fresnel lens at an angle to reflect the incident light striking the wall surfaces, in a direction toward outside of a range of the eye box.

Abstract: A head-up display includes a display device and a projection optical system. The projection optical system has a lens group including at least one lens element and projects onto a reflecting member an image displayed on the display device. The lens group includes a drive lens that shifts along an optical path to change its distance from the display device.

Abstract: A head-up display includes a display device and a projection optical system. The projection optical system has a lens group including at least one lens element and projects onto a reflecting member an image displayed on the display device. The lens group includes a drive lens that shifts along an optical path to change its distance from the display device.