A wearable display apparatus comprises a control unit, a display unit, an optical transmission unit and a photoelectric detection unit. The control unit is configured to control the display unit to output a display image, the light transmission unit is configured to transmit a first part of light of the display image to human eyes, and transmit a second part of the light of the display image to the photoelectric detection unit, the photoelectric detection unit is configured to send a feedback signal to the control unit; and the control unit is configured to compensate for a drift of characteristics including brightness and color according to the feedback signal from the photoelectric detection unit.

Embodiments described herein relate to waveguide combiners having arrangements for image uniformity. The waveguide combiners includes an input coupling grating (ICG) defined by a plurality of input structures, a pupil expansion grating (PEG) defined by a plurality of expansion structures, an output coupling grating (OCG) defined by a plurality of output structures The waveguide combiners includes at least one of a pixelated phase modulator is aligned with the PEG of the first side of the waveguide combiners, at least one of a Y expander and an X expander disposed on a second side of the waveguide combiners opposing the first side, or a pupil shifting mechanism operable to shift incident beams of light between a first position and a second position of the ICG.

There is provided an optical element which includes a medium including a diffractive optical element (DOE). The medium is to receive a beam of light via a light guide. If the beam is incident upon the medium at an incidence angle within a first range of angles, the DOE is to direct a first portion of the beam out of the light guide along a second direction to form an outcoupled beam, and cause a second portion of the beam to propagate towards a surface of the light guide. Furthermore, if the incidence angle is within a second range of angles, the DOE is to split from the beam a third portion and a fourth portion each propagating towards the surface of the light guide. The third and fourth portions are to propagate along a third and a fourth direction respectively, which third direction is different than the fourth direction.

A backlight module and a display device are disclosed. The backlight module includes: a back plate (1); a middle frame (3) disposed on the back plate (1); a light-emitting substrate (2) disposed on the back plate (1) and in the middle frame (3), the light-emitting substrate (2) including a first light-emitting area (203) and a second light-emitting area (204) surrounding the first light-emitting area (203), and the second light-emitting area (204) being close to an edge of the light-emitting substrate (2); a light compensation structure (100) close to the edge of the light-emitting substrate (2), the light compensation structure (100) including one or more light conversion materials. The backlight module and the display device can improve the display effect.

A display subsystem for a virtual image generation system comprises a planar waveguide apparatus, an optical fiber, at least one light source configured for emitting light from a distal end of the optical fiber, and a mechanical drive assembly to which the optical fiber is mounted as a fixed-free flexible cantilever. The drive assembly is configured for displacing a distal end of the optical fiber about a fulcrum in accordance with a scan pattern, such that the emitted light diverges from a longitudinal axis coincident with the fulcrum. The display subsystem further comprises an optical modulation apparatus configured for converging the light from the optical fiber towards the longitudinal axis, and an optical waveguide input apparatus configured for directing the light from the optical modulation apparatus down the planar waveguide apparatus, such that the planar waveguide apparatus displays one or more image frames to an end user.

One or more embodiments of the present disclosure may include: a transparent member; a housing coupled to the transparent member in a rotatable manner via a hinge portion, such that the housing is foldable in a designated direction with respect to the transparent member; a projector at least partially disposed in the housing; and an optical transferring member configured to guide light emitted from the projector to the transparent member when the housing is unfolded with respect to the transparent member in an unfolded state.

A light-emitting module includes: a light-guiding plate having a first main surface serving as a light extracting surface and a second main surface opposite to the first main surface, a recess defined in the second main surface by at least one lateral surface and a base surface; a wavelength conversion member in the recess of the light-guiding plate, the wavelength conversion member having a first surface facing the base surface defining the recess, a second surface opposite to the first surface, and at least one lateral surface between the first surface and the second surface; at least one light-emitting element bonded to the second surface of the wavelength conversion member; a light-transmissive member disposed between the lateral surface defining the recess and the lateral surface of the wavelength conversion member; and a light-reflective member covering the second main surface of the light-guiding plate and lateral surfaces of the light-emitting element.

A display device according to the present disclosure includes an imaging light generating device configured to emit imaging light, a first diffraction element configured to diffract the imaging light emitted from the imaging light generating device, a second diffraction element configured to diffract the imaging light diffracted by the first diffraction element to form an exit pupil, and an optical filter disposed between the imaging light generating device and the exit pupil, and configured to attenuate a band on a short wavelength side of a peak wavelength of red light included in the imaging light emitted from the imaging light generating device.

A waveguide display includes a waveguide and a grating coupler configured to couple display light into or out of the waveguide. The grating coupler includes at least a first grating layer and a second grating layer arranged in a stack. The first grating layer is characterized by a first thickness and includes a first transmission VBG configured to diffract display light of a first wavelength from a first field of view. The second grating layer is characterized by a second thickness greater than the first thickness and includes a second transmission VBG configured to diffract display light of the first wavelength from a second field of view greater than the first field of view.