Embodiments of the present disclosure, relating to the technical field of projection and display, provide a projection device. The projection device includes a projecting unit, a dust-proof device, and an adjusting unit. The dust-proof device includes a housing, a first light-transmissive plate, and a second light-transmissive plate. The housing is provided with a receiving chamber. The projecting unit is disposed in the dust-proof device, and the dust-proof device achieves a dust-proof function for the projecting unit. In addition, part of the projection light beam of the projecting unit may be emitted from the first light-transmissive plate of the dust-proof device to achieve projection in a first direction, and may be emitted from the second light-transmissive plate to achieve projection in a second direction. The adjusting unit disposed on the dust-proof device may adjust the projection direction of the projection light beam emitted from the second light-transmissive plate to enlarge a projection range in the second direction. According to the embodiments of the present disclosure, multi-direction projection and dust-proofing are implemented.

An image display system includes semiconductor light sources that output optical signals including modulated signal portions at timings different from each other, optical fiber cables that respectively transmit the optical signals, a light synthesizer that synthesizes the optical signals to output a synthesized optical signal, a light amount detector that detects an output light amount of the synthesized optical signal, a modulated signal detector that detects the modulated signal portions from the detected output light amount, an image modulator that modulates the synthesized optical signal according to an input image signal to output a modulated image light, and a light source controller that outputs drive control signals for respectively outputting the optical signals respectively including the modulated signal portions according to the image signal, and detects a failure of the optical fiber cables based on whether a modulated signal portion among the plurality of modulated signal portions is detected.

Disclosed is a polarization-dependent light steering device based wide projection display system which can extend the screen projection region of an image at low cost without lowering of resolution. A wide projection display system according to an embodiment of the present invention comprises: a projector for sequentially outputting, in a time division scheme, images to be projected to different regions on a screen; and a light steering device installed behind the projector to differently control the output directions of the images according to the polarization directions of the images. The light steering device comprises a plurality of Fresnel prism arrays having polarization dependence. The plurality of Fresnel prism arrays are stacked along the projection direction of images output from the projector.

Disclosed is a polarization-dependent light steering device based wide projection display system which can extend the screen projection region of an image at low cost without lowering of resolution. A wide projection display system according to an embodiment of the present invention comprises: a projector for sequentially outputting, in a time division scheme, images to be projected to different regions on a screen; and a light steering device installed behind the projector to differently control the output directions of the images according to the polarization directions of the images. The light steering device comprises a plurality of Fresnel prism arrays having polarization dependence. The plurality of Fresnel prism arrays are stacked along the projection direction of images output from the projector.

An interference lens and a projection ambient lamp are provided. The interference lens includes: an interference sheet with a first surface and a second surface opposite to the first surface, the first surface being a rough surface; and a reflective film provided at the interference sheet; wherein light is reflected by the reflective film to form an interference pattern. The projection ambient lamp includes the foregoing interference lens, a light source and a focusing lens; light emitted from the light source passes through the interference lens and is reflected by the reflective film to form an interference pattern, which is focused by the focusing lens and projected on a medium. The present disclosure realizes simplification of the structure by providing a reflective film at the interference lens, hence utilization of light energy is higher, power consumption is lower, manufacturing cost is lower, and projection effect is better.

A projector includes an outer casing and a projection module. The outer casing has a front end surface, a projection opening, and at least one heat dissipation opening. The projection opening and the at least one heat dissipation opening are located at the front end surface. The projection module is disposed in the outer casing and includes a light source module configured to provide an illumination beam, a light valve configured to convert the illumination beam to an image beam, and a projection lens protruding from the front end surface and is configured to project the image beam out of the outer casing through the projection opening. The projection module is configured to rotate relative to the outer casing to change a projection direction of the image beam and may be embedded in a ceiling and present a better appearance, and the projection direction of the projector is less restricted.

Based on information about a vehicle, the information can be projected and displayed onto a road surface or the like. An image projection apparatus, which projects an image, includes an acquisition unit that acquires the information about the vehicle, and an image projection unit that projects the image based on the information acquired by the acquisition unit.

Based on information about a vehicle, the information can be projected and displayed onto a road surface or the like. An image projection apparatus, which projects an image, includes an acquisition unit that acquires the information about the vehicle, and an image projection unit that projects the image based on the information acquired by the acquisition unit.

A projection optical apparatus includes a projection system projecting light and including a resin lens, a degradation suppressor configured to suppress degradation of the resin lens, and a projection controller configured to control the degradation suppressor.

An image projector with a high optical efficiency projects an image at an arbitrary distance from an observer. The image projector includes an illumination module having at least one spatially coherent light source; a phase image generator with an array of optical phase shifting elements; an electronic image controller connected electrically to the phase image generator; and a waveguide which includes at least one embedded partial reflector. The waveguide may be positioned either between the illumination module and the waveguide, or between the waveguide and the observer. The phase image generator may include phase shifts for canceling speckle, correcting optical aberrations, and/or compensating interference caused by light rays having different optical path lengths.