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.

The present disclosure, relating to the technical field of projection and display, provides a projection device. The projection device includes: a projecting unit, configured to emit a projection screen; a direction adjusting unit; a reflecting unit, fixed to the direction adjusting unit, wherein the direction adjusting unit is configured to adjust a reflection direction of the reflecting unit; and a height adjusting unit, wherein one end of the height adjusting unit is connected to the projecting unit and the other end of the height adjusting unit is connected to the direction adjusting unit, the height adjusting unit is configured to adjust a spacing between the reflecting unit and the projecting unit, and the reflecting unit is configured to reflect the projection screen emitted by the projecting unit. With such configurations according to the embodiments of the present disclosure, a height of the projection screen is adjusted by adjusting a spacing between the reflecting unit and the projecting unit.

The present disclosure, relating to the technical field of projection and display, provides a projection device. The projection device includes: a projecting unit, configured to emit a projection screen; a direction adjusting unit; a reflecting unit, fixed to the direction adjusting unit, wherein the direction adjusting unit is configured to adjust a reflection direction of the reflecting unit; and a height adjusting unit, wherein one end of the height adjusting unit is connected to the projecting unit and the other end of the height adjusting unit is connected to the direction adjusting unit, the height adjusting unit is configured to adjust a spacing between the reflecting unit and the projecting unit, and the reflecting unit is configured to reflect the projection screen emitted by the projecting unit. With such configurations according to the embodiments of the present disclosure, a height of the projection screen is adjusted by adjusting a spacing between the reflecting unit and the projecting unit.

A projector includes a main body and a projection lens. The main body includes a light source, liquid crystal panels that modulate light outputted from the light source, and a lens holder to and from which the projection lens is attachable and detachable. The projection lens projects the light modulated, and the lens holder includes a first lens holding mechanism and a second lens holding mechanism that hold the projection lens.

A projector includes a main body and a projection lens. The main body includes a light source, liquid crystal panels that modulate light outputted from the light source, and a lens holder to and from which the projection lens is attachable and detachable. The projection lens projects the light modulated, and the lens holder includes a first lens holding mechanism and a second lens holding mechanism that hold the projection lens.

A venous positioning projector includes an infrared light source module, a light splitting element, an infrared light image capture module, a processor, and a visible light projection module. The infrared light source module outputs a first infrared light to a target surface. The infrared light image capture module includes a filter and an infrared light image capture element. The light splitting element transmits a second infrared light reflected by the target surface to the filter. The infrared light image capture element receives the second infrared light passing through the filter. The processor generates venous image data according to the first infrared light and the second infrared light received by the infrared light image capture element. The visible light projection module generates a visible light based on the venous image data. The visible light is transmitted to the target surface through the light splitting element to generate a venous image.

A projection device includes a drive housing that includes a protruding portion protruding from a central portion, a projection lens that includes a first rotation mechanism, and fans that draw in or discharge gas; the central portion includes a first A side surface that is provided in a first A direction X1 corresponding to one side in a first direction X and a second A side surface that is provided in a first B direction X2 corresponding to the other side in the first direction X; the protruding portion includes a first B side surface in the first A direction X1 and includes a second B side surface, which faces the projection lens, in the first B direction; and the fans face the second A side surface and the second B side surface.

The application relates to the technical field of projection, and discloses a projection device which can improve the brightness of projection imaging. Part of the projection device comprises: an LED light source, a color wheel, a light-equalizing rod, a convex lens, a first Fresnel lens, an LCD panel and a projection lens; a ray of target light emitted by the LED light source emits a target alternating light through the color wheel, and the target alternating light comprises five monochromatic lights including red light, green light, blue light, yellow light and white light, and the five monochromatic lights enter the light-equalizing rod for uniform treatment to emit an uniform light spot, the uniform light spot is imaged at the first Fresnel lens through the convex lens, then irradiated into the LCD panel, and projected by the projection lens.

The application relates to the technical field of projection, and discloses a projection device which can improve the brightness of projection imaging. Part of the projection device comprises: an LED light source, a color wheel, a light-equalizing rod, a convex lens, a first Fresnel lens, an LCD panel and a projection lens; a ray of target light emitted by the LED light source emits a target alternating light through the color wheel, and the target alternating light comprises five monochromatic lights including red light, green light, blue light, yellow light and white light, and the five monochromatic lights enter the light-equalizing rod for uniform treatment to emit an uniform light spot, the uniform light spot is imaged at the first Fresnel lens through the convex lens, then irradiated into the LCD panel, and projected by the projection lens.

A light engine includes an image surface, a projected light surface, a projection lens assembly, and a plurality of folding elements. The image surface has three image areas. The projected light surface has three light sources that provide light with different wavelengths. The plurality of folding elements are arranged along a light emitting axis. The image surface and the projected light surface are substantially in parallel with the light emitting axis, and there is an air gap located between the image surface and the projected light surface. The three light sources respectively correspond to the plurality of folding elements and respectively correspond to the three image areas, and the light emitting axis and the projection lens assembly are disposed on the same optical path.