Controlling a mirror in a MEMS based projector. A method includes iteratively performing various acts. The method includes inputting a time domain target wave array, with target elements, to a system for a MEMS coupled to the mirror of the projector. The time domain target wave array includes a set of n target elements. The method further includes driving the driver to move the mirror using elements in a drive array comprising a set of drive elements. The method further includes sampling a time domain output wave for the movement of the mirror to construct an output wave array with output elements corresponding to the target elements. The method further includes identifying errors between the target elements and the output elements. The method further includes modifying the drive elements in the drive array to attempt to minimize the errors when driving the MEMS on subsequent drive cycles.

A portable connected lamp makes it possible to project a pattern. The lamp includes lighting to transmit a light. The lighting includes a transmitter to transmit at least one light beam and a projector arranged to project at least one light pattern. The lamp also includes a receiver to receive control instructions via a wireless connection, the control instructions including data to be projected, and a controller to control the projector so that they project the data received by the receiver.

A display system includes: a light source system configured to emit light beams; a scanner configured to scan the light beams on the surface of a spatial light modulator in the form of a light spot, the light spot corresponding to multiple pixels of the spatial light modulator; a spatial light modulator configured to modulate, according to an image modulation signal from a processing and control system, the light spot projected onto the spatial light modulator by the scanner to output image light; a processing and control system configured to output a light source timing modulation signal to a light source modulation device according to an input image signal and output an image modulation signal to the spatial light modulator; and a light source modulation device.sub.s configured to adjust the output brightness of the light source system according to the light source timing modulation signal.

In one aspect, an optical device comprises a plurality of waveguides formed over one another and having formed thereon respective diffraction gratings, wherein the respective diffraction gratings are configured to diffract visible light incident thereon into respective waveguides, such that visible light diffracted into the respective waveguides propagates therewithin. The respective diffraction gratings are configured to diffract the visible light into the respective waveguides within respective field of views (FOVs) with respect to layer normal directions of the respective waveguides. The respective FOVs are such that the plurality of waveguides are configured to diffract the visible light within a combined FOV that is continuous and greater than each of the respective FOVs.

A virtual image display device displays a virtual image by projecting a display light of an image toward a projection unit, and includes: a display unit configured to emit the display light; and a diffraction reflection element configured to reflect the display light emitted from the display unit by diffraction. The diffraction reflection element has a plate shape along a horizontal plane. The diffraction reflection element is configured to emit the display light toward the projection unit arranged above the diffraction reflection element when the display light is incident, and is set such that an angle of incidence on the diffraction reflection element is larger than an angle of emission from the diffraction reflection element.

A display device may include a projector coupled to volume Bragg grating (VBG) based pupil-replicating lightguide. The projector may be a scanning projector or a display panel based projector. A lighting unit for the display panel may have spatially variant spectral composition selected to match angular and wavelength selectivity of the VBGs of the pupil-replicating lightguide, thereby improving light utilization efficiency of the display device. In scanning projector implementations, the center wavelength of the scanned light beam may be varied in coordination with the scanning, to achieve the same effect.

The present technology relates to an image processing apparatus, an image processing method, and a projection apparatus that can improve brightness of a projected image while satisfying a safety standard for laser products. A saturation emphasis processing unit determines, in accordance with saturation of an image, a first emphasis coefficient that emphasizes luminance of the image, and converts a luminance signal of the image on the basis of the determined first emphasis coefficient. The present technology can be applied to, for example, a laser beam scanning type projection apparatus or the like that performs scanning with a laser beam as a light source.

A reflector includes a low refractive index layer having a first average refractive index; and a high refractive index layer having a second average refractive index. The low refractive index layer includes a laminate of alternate Ga-doped AlN layers and layers consisting essentially of GaN. The high refractive index layer includes an InGaN layer. The second average refractive index is higher than the first average refractive index.

Systems, devices, and methods for optical engines and laser projectors that are well-suited for use in wearable heads-up displays (WHUDs) are described. Generally, the optical engines of the present disclosure integrate a plurality of laser diodes (e.g., 3 laser diodes, 4 laser diodes) within a single, hermetically or partially hermetically sealed, encapsulated package. The optical engines include an optical director element that includes a curved reflective surface (e.g., parabolic cylinder) that redirects laser light beams and collimates the same along the fast axes thereof. Such optical engines may have various advantages over existing designs including, for example, smaller volumes, better manufacturability, faster modulation speed, etc. WHUDs that employ such optical engines and laser projectors are also described.

A fiber scanning projector includes a piezoelectric element and a scanning fiber passing through and mechanically coupled to the piezoelectric element. The scanning fiber emits light propagating along an optical path. The fiber scanning projector also includes a first polarization sensitive reflector disposed along and perpendicular to the optical path, a quarter wave plate disposed adjacent the first polarization sensitive reflector, and a second polarization sensitive reflector disposed along and perpendicular to the optical path.