A homogenizing element includes a light incident end, a light exit end, a first surface, a second surface, a reflective layer and a first dichroic layer. The first surface extends from the light incident end to the light exit end. The second surface extends from the light incident end to the light exit end, and the second surface overlaps the first surface and is non-parallel to the first surface. The first dichroic layer is disposed on the first surface and configured to allow a first beam to pass therethrough and reflect a second beam. The reflective layer is disposed on the second surface and configured to reflect the first beam. A projection device adopting the homogenizing element is also provided. The homogenizing element and the projection device provided can adjust the beam angles of different color beams respectively.

An optical device is provided including a light-imaging component configured to focus light fed to the light-imaging component in at least one focusing spot, wherein the light fed includes at least one predefinable wavelength; and a conversion apparatus including at least one phosphor which is designed to convert light having the at least one predefinable wavelength into conversion light, wherein the conversion apparatus is arranged in such a way that the at least one phosphor is arranged in the focusing spot of the light-imaging component. The light-imaging component is configured to generate at least two focusing spots, and the conversion apparatus is arranged in such a way that the at least two focusing spots are positioned on the at least one phosphor.

Projection systems and/or methods for efficient use of light by recycling a portion of the light energy for future use are disclosed. In one embodiment, a projection display system is disclosed comprising a light source; an integrating rod that receives light from said light source at a proximal end that comprise a reflective surface which may reflecting/recycle light down said integrating rod; of reflecting light down said integrating rod; a relay optical system, said relay optical system further comprising optical elements that are capable of moving the focal plane of the projector display system; and a modulator comprising at least one moveable mirror that reflects light received from the integrating rod in either a projection direction or a light recycling direction.

An optical device includes a first plate having a first transparent region defining an exit face of the device, and a second plate having a second transparent region defining an entrance face of the device. At least one lens is formed over at least one of the first and second transparent regions. First and second planar reflectors are spaced apart and fixed between the first and second plates in mutually-parallel orientations diagonal to the first and second plates, thereby defining an optical path through the device from the entrance face, reflecting from the first and second reflectors, through the exit face and passing through the at least one refractive surface.

A lighting apparatus for a vehicle may include a light output unit; an interface unit; and at least one processor. The at least one processor may be configured to control the light output unit to generate light that illuminates an exterior of the vehicle. The at least one processor may also be configured to receive first information via the interface unit; and control the light output unit to display, via the light that illuminates the exterior of the vehicle, a visual image corresponding to the received first information. The at least one processor may further be configured to receive second information via the interface unit; and control the light output unit based on the received second information to change the visual image displayed by the light that illuminates the exterior of the vehicle.

An efficient conjugate lighting system for an LCD projector, includes an LED light source, a square cone condenser, a collimating lens, a quarter-wave plate, a brightness-enhancing polarizer, an LCD light valve, a field lens and a projection lens which are provided in sequence according to a direction of light travel; wherein the efficient conjugate lighting system for the LCD projector further comprises a reflecting mirror provided at an entrance port of the square cone condenser; a light-transmitting surface of the entrance port of the square cone condenser is bisected along a horizontal centerline or a vertical centerline to form a first sub-light-transmitting surface and a second sub-light-transmitting surface; a light-emitting surface of the LED light source is provided on the first sub-light-transmitting surface, and the reflector is provided on the second sub-light-transmitting surface.

An illumination system and a projection device having good uniformity are provided. The illumination system includes at least one light source, a depolarizing element, and a light homogenizing element. The at least one light source is configured to provide multiple beams. The depolarizing element is disposed on a transmission path of the beams. The depolarizing element includes a first optical element, which is wedge-shaped and has a first optical axis. A direction of any one of the beams incident onto the first optical element is parallel to the first optical axis. The beams respectively become multiple linearly polarized beams with different polarization directions after passing through the first optical element. The light homogenizing element is configured to allow the linearly polarized beams to pass through to form an illumination beam. The depolarizing element is located between the at least one light source and the light homogenizing element.

An illumination system and a projection device are provided. The illumination system includes a laser light source, a light splitting element, a wavelength conversion module, a filter module, and a homogenizing element. The laser light source provides a laser beam to the light splitting element. The filter module rotates around a rotation axis and has multiple dichroic filter regions on a surface perpendicular to the rotation axis. The filter module receives the laser beam from the light splitting element, and an acute angle is formed between the rotation axis and a direction in which the laser beam enters the filter module. The homogenizing element is located on a transmission path of the laser beam penetrating the filter module, and the laser beam enters the homogenizing element along a long axis direction of the homogenizing element.

The disclosure provides a display unit and a projection device. The display unit includes a first display panel having first light emitting elements configured to provide a first color light, a wavelength conversion element located on a transmission path of the first color light and having a conversion region and a non-conversion region, a second display panel having second light emitting elements configured to provide a second color light, and a light combining element. A quantum dot conversion material is disposed on the conversion region. Part of the first color light is converted into a third color light after passing through the conversion region, and another part of the first color light passes through the non-conversion region. The light combining element is located on transmission paths of the first color light, the second color light and the third color light and is configured to form an image beam.

Various embodiments described herein provide multi-projector (i.e., two or more) imaging apparatuses utilizing integrated illumination-aimer optics. Embodiments of the present disclosure minimize irreparable component offset to improve overall accuracy associated with the functioning of the apparatuses. Additionally, the integrated illumination-aimer optics enables embodiments disclosed herein to be provided in a significantly smaller form factor than conventional multi-projector imaging apparatuses. An example apparatus includes a near-field imaging lens and a far-field imaging lens, an integrated illumination-aimer optics positioned between the near-field imaging lens and the far-field imaging lens, a near-field illuminator source and a far-field illuminator source positioned for projecting via the integrated illumination-aimer optics, a near-field imaging sensor associated with the near-field imaging lens, a far-field imaging sensor associated with the far-field imaging lens, and an apparatus chassis to align the various components for operation.