An optical system of the present disclosure includes: a first optical system including a polarization conversion element aligning a polarization direction of light including color light beams with a predetermined polarization direction, and generating illumination light including the color light beams; a first polarization rotation element disposed at a first pupil position inside the first optical system, including first and second divided regions, in which the first and second divided regions have different polarization characteristics with respect to a first color light beam outputted from the polarization conversion element; a polarizer disposed between the polarization conversion element and the first polarization rotation element, and reducing light in a polarization direction other than the predetermined polarization direction included in light outputted from the polarization conversion element; and light valves each illuminated by at least the first color light beam included in the illumination light generated by the first optical system.

An image display device is provided that allows easy adjustment of positional deviation in an optical axis direction of an optical modulation element from the outside. The image display device includes: a housing including an operation surface; an optical modulation element that is housed in the housing and that includes an image-forming surface that modulates light to form an image; a holding portion that movably holds the optical modulation element at least in a direction perpendicular to the image-forming surface; and an adjusting portion including at least one wire member, one end of the wire member being connected to the holding portion and the other end rotatably attached to the operation surface. Holding portion includes a movable portion that is moved in a direction perpendicular to the image-forming surface by the rotation of the other end of the wire member.

A projector device comprises: an image projection unit for projecting a guide image including a plurality of first objects; a camera; and a processor for obtaining a captured image acquired by the camera, the captured image including a guide image projected through the image projection unit. The processor identifies first location information corresponding to a location of each of a plurality of first objects included in the obtained captured image, identifies second location information corresponding to a location of each of a plurality of second objects related to the plurality of first objects, respectively, on the basis of the obtained captured image, and acquires image correction information on the basis of the first location information and the second location information.

Disclosed is an integrated projection and illumination device. The integrated projection and illumination device includes a lamp housing, a mounting assembly, an illumination assembly and a projection assembly; and the mounting assembly includes a mounting disc, a mounting ring and clamping blocks, elastic members being arranged between the clamping blocks and the mounting ring, the mounting disc being provided with top surface connectors and an outer limiting edge, the outer limiting edge being capable of being clamped on the clamping blocks protruding out of the inner wall of the mounting ring, the mounting disc being further provided with pressing blocks, and the pressing blocks rotating along with the mounting disc and being capable of making contact with the clamping blocks and pressing the clamping blocks into the mounting ring during rotation. The present disclosure can be used for illumination and projection, and further features convenient dismounting and mounting.

An electronic apparatus is provided. The electronic apparatus includes: a memory configured to store an image; a sensor part including at least one sensor; a projection part including a projection lens configured to output the image to a projection surface; and a processor configured to acquire distance information from the electronic apparatus to the projection surface through the sensor part, acquire output size information of the image based on the acquired distance information, acquire projection surface information corresponding to a bend of the projection surface through the sensor part, acquire movement information of the projection lens based on the output size information of the image and the projection surface information, and control the projection part to output the image based on the movement information.

A control method for a projector attachable to a wall via an attachment fixture includes determining whether the projector is attached to the wall, detecting oil included in air, determining, when determining that the projector is attached to the wall, based on a detection result of the oil included in the air, whether confirmation concerning the attachment of the projector is necessary, and displaying, when determining that the confirmation concerning the attachment of the projector is necessary, a confirmation image for urging the confirmation concerning the attachment of the projector on a display surface.

An electronic apparatus projecting an image is disclosed. The electronic apparatus includes a main body, a projector, a plurality of sensors including an acceleration sensor that detects a sensing value, and a plurality of distance sensors that detect a distance value between the electronic apparatus and a screen, a support connected to the main body, and a processor configured to identify a vertical angle by which the electronic apparatus is tilted, based on a sensing value detected by the acceleration sensor, identify a rotation angle by which the electronic apparatus is rotated based on a distance value detected by the plurality of distance sensors, perform a function corresponding to a keystone correction on an image to provide a modified image, identify a size of the modified image based on the vertical angle or the rotation angle, and control the projector to project the modified image based on the size of the modified image.

A display method includes projecting, by a projector on a first projection surface located at a first distance from the projector, a first image which represents a size of a second image to be projected on a second projection surface by the projector, the second projection surface being located at a second distance, different from the first distance, from the projector.

The present disclosure describes a projector which has: an image projection portion; an image provision portion that provides a projection image to the image projection portion; a deviation movement detection portion that detects a deviation movement of the image projection portion; and an image process portion that based on detection by the deviation movement detection portion, shifts the image provided by the image provision portion in a direction where the deviation movement is corrected. According to this, even if an image projection function does not include a deviation correction function, it is possible to perform the deviation correction by means of the image process.

A magnification optical system forms an enlarged image of an object. It includes a refractive optical system including a plurality of lens groups; and a mirror train including a curved mirror, arranged in this order from an object side, a first focus structure configured to move the respective lens groups of the refractive optical system by different amounts along a normal line of a conjugate surface on the object side, and a second focus structure configured to move the respective lens groups along the normal line of the conjugate surface on the object side by different amounts from those of the first focus structure.