A projection-type display device of the present disclosure includes: an optical element including a first polarization beam splitter (10), a retardation plate (50), and first changing means (63); and a first reflective spatial light modulator (40G), in which first light that has a first wavelength range and that has been emitted from a light source and has entered the first polarization beam splitter (10) via the first reflective spatial light modulator (40G) exits the first polarization beam splitter (10), passes through the retardation plate (50), and travels toward a projection optical system, and return light of the first light returning from the projection optical system passes through the retardation plate (50), enters the first polarization beam splitter (10), exits the first polarization beam splitter (10), and collides with the first changing means (63) to have the light path, the wavelength range, or the polarization state of the return light changed by the first changing means.

The present disclosure relates to the technical field of digital projection display, and discloses a projection method and a projection apparatus. The method includes: acquiring a target object image; identifying attribute information of a target object based on the target object image; acquiring preset projection content based on the attribute information of the target object; acquiring a projection path; and projecting a projection screen based on the preset projection content and controlling the projection screen to move along the projection path. In this way, the projection is more flexible and more pertinent.

An illumination optical system is provided that is configured to guide light emitted from a light source to an image generation unit that is arranged to be movable in a direction perpendicular to incoming light and is configured to generate an image by reflecting the incoming light. The illumination optical system includes a first lens that is arranged to be movable in a direction perpendicular to an optical axis of the first lens, a second lens that is arranged to be movable in a direction that changes a face-to-face distance between the first lens and the second lens, and a lens position control unit configured to displace the first lens and the second lens.

A projector with image plane modal vibration for speckle reduction is provided. The projector includes: a laser light source; a light modulator; and optics that convey light from the laser to the modulator and project modulated light from the modulator, the optics comprising an image plane. The projector further includes: a surface comprising at least a first region located at the image plane, the first region being at least as large as an image formed at the image plane, the first region configured to one or more of transmit and reflect the image; and at least three actuators, positions of interaction of the actuators with the surface are asymmetric relative to the surface, the actuators configured to generate respective moving surface waves in the first region at respective frequencies, the respective frequencies comprising non-integer multiples of each other.

A light source device includes a wavelength conversion element including a substrate and a wavelength conversion layer that is retained by the substrate. The wavelength conversion layer absorbs a portion of incident first color light to output second color light in a wavelength range different from the first color light while outputting an unabsorbed portion of the first color light, in which a portion of the substrate and the wavelength conversion layer has a function of diffusing the first color light.

In some examples, a projection display surface is configured to reflect a first image or image portion in a first direction and a second image or image portion in a second direction. In some cases, first light corresponding to the first image is projected onto a display surface that includes a first plurality of reflectors configured to reflect the first light in a first direction, but not reflect second light corresponding to the second image. The display surface may further include a second plurality of reflectors to reflect the second light in a second direction, but not reflect the first light. In some examples, the first light is within a first wavelength range and the second light is within a second, different wavelength range. In other examples, the first light has a first polarization and the second light has a second, different polarization.

A projection lens includes, in order from a magnification side to a reduction side, a first lens group having a negative refractive power, a reflector to bend an optical path, a second lens group having a positive refractive power, and an aperture stop disposed within the second lens group. The second lens group has a positive refractive power on the magnification side of the aperture stop, and a negative refractive power on the reduction side of the aperture stop. Conditional formula (A) is satisfied: (A) Ot/Y′<6.1, where Ot is a distance along the optical axis between a maximum-magnification-side surface of the first lens group and a surface of a lens adjacent to a reduction-side surface of the reflector, and Y′ is a maximum height of the image displayed on the display surface of the image display element.

A filter, having a first filter material and second filter material, the first and second filter materials having different light attenuation properties and being in mutual contact along an interface surface, a cross-section of which has a curved line. Additionally, a method for preparing a filter, by: combining a first surface and an element to form a moulding cavity, delimited by the surface and by a moulding surface of the element; inserting a first material in liquid state; allowing the first material to solidify; removing the element to form a second moulding cavity, delimited by a second part of the surface and by the solidified first material; and inserting a second material in the second moulding cavity.

An image recording device having a projected viewfinder is described that projects individual, or multiple sets of synchronized framing beams onto a target image that are coaxially aligned with the field of view of the camera. The set of framing beams is projected onto the target image beyond the scope of the field of view being recorded by the image recording device but still within the field of vision of the operator of the device. In this way, the operator of the image recording device will be able to clearly see the framing beams identifying the limits of the recorded areas, while not having any portion of the field of view of the image recording device obscured by the framing beams themselves.

An image projection apparatus includes a light source, an image generation unit configured to receive light from the light source and generate an image based on the received light, a projection optical system unit configured to project the image generated by the image generation unit, a heat dissipation unit configured to dissipate heat of the image generation unit, and a movable member configured such that a position of the movable member is movable relative to the projection optical system unit, wherein the image generation unit and the heat dissipation unit are mounted on the movable member.