A hologram image display apparatus includes an illumination optical system that emits an illumination light beam wavefront and a spatial light modulator having a light modulation area that converts the illumination light beam wavefront by diffraction to a display light beam wavefront and displays a virtual image. The spatial light modulator forms the display light beam wavefront by modulating the illumination light beam wavefront so that at least a portion of a regular light ray group configuring the display light beam wavefront is a light ray group with a diffraction angle having an absolute value greater than the ±first-order diffraction angle by the spatial light modulator, and another portion of the regular light ray group is a light ray group with a diffraction angle having an absolute value of the ±first-order diffraction angle or less by the spatial light modulator.

A head up display arrangement for a motor vehicle includes a disc having a plurality of holographic optical elements. A motor rotates the disc. An image source produces an image. A transmissive display receives the image and collimated coherent light and projects an illuminated version of the image onto the disc. An optical element receives a reflection of the illuminated version of the image off of the disc and projects the reflection onto a windshield of the motor vehicle.

In one example, a display is described, which may include a plurality of spaced light emitting device packages, a privacy gate having partition walls to partition each of the plurality of spaced light emitting device packages, and a control unit to selectively move the partition walls up or down relative to the plurality of spaced light emitting device packages to control a viewing angle of the display.

To provide an illumination device and a projection type image display device that illuminate an area to be illuminated (image formation area) under conditions where speckle noise is less noticeable. An illumination device according to the present invention includes: a light source 11 that emits coherent light; an optical scanning section 15 that scans the coherent light emitted from the light source 11; and an optical path conversion system 21 configured to allow the coherent light scanned by the optical scanning section 15 to illuminate an area to be illuminated sequentially in an overlapping manner. An incident angle of the coherent light that enters respective points of the area to be illuminated changes with time.

A near-eye display system includes a display panel, a beam steering assembly facing the display panel, a display controller, and a beam steering controller. The beam steering assembly imparts one of a plurality of net deflection angles to incident light. The display controller drives the display panel to display a sequence of images, and the beam steering controller controls the beam steering assembly to impart a different net deflection angle for each displayed image of the sequence. The sequence of images, when displayed within the visual perception interval, may be perceived as a single image having a resolution greater than the resolution of the display panel or having larger apparent pixel sizes that conceal the black space between pixels of the display, or the sequence of images may represent a lightfield with the angular information represented in the net deflection angles imparted into the images as they are projected.

A display includes a projector configured to provide light of a virtual image, a waveguide into which the light of the virtual image is injected at an injection angle by the projector, and a combiner disposed along the waveguide and configured to redirect the light of the virtual image. The waveguide is configured to emit the light at a point established by the injection angle. The combiner is further configured to allow ambient light from beyond the waveguide to pass through the combiner. The waveguide constrains the light of the virtual image through total internal reflection along a curved path for the light between the projector and the combiner.

The present disclosure provides a grating including: a first substrate including stacked first and second electrode layers each including strip-shaped electrodes with an identical width, strip-shaped electrodes in the first and second electrode layers arranged alternately; a second substrate opposite to the first substrate with a liquid crystal layer therebetween; driving modules for driving the strip-shaped electrodes to form light shading parts and light transmission parts, one light shading part and one adjacent light transmission part defining a grating unit, at least one grating unit defining a grating part, the driving modules arranged in one-to-one correspondence with the grating parts; and a control module for generating driving signals in one-to-one correspondence with the driving modules according to a distance between the human eyes and the grating, thereby changing a width of the grating unit corresponding to a crosstalk position. A 3D display device and a grating driving method are provided.

A heterodyne two-dimensional grating measuring device and measuring method thereof includes a light source, a reading head, a photoelectric receiving module, and a signal processing system. The light source is configured to generate two beams of linearly polarized lights having characteristics of overlapping, polarization orthogonal, and fixed frequency difference. The reading head is configured to receive the two beams of the linearly polarized lights, the two beams of the linearly polarized lights are respectively incident on a surface of a moving two-dimensional measuring grating to generate ±1-order diffracted lights of two dimensions, and the ±1-order diffracted lights are respectively incident to the photoelectric receiving module through the reading head. The photoelectric receiving module is configured to generate beat frequency signals, the signal processing system is configured to perform differential calculation on the beat frequency signals to realize a displacement measurement of measuring grating for four-fold optical subdivision.

The present disclosure relates to the field of display technologies, and specifically discloses a liquid crystal display panel, a driving method therefor and a display device. Specifically, the liquid crystal display panel comprises: a first substrate and a second substrate arranged oppositely, as well as a plurality of liquid crystal diffraction units arranged in a same layer between the first substrate and the second substrate. Each liquid crystal diffraction unit comprises: a first electrode, a second electrode comprising at least one strip sub-electrode, as well as liquid crystal sandwiched between the first electrode and the second electrode. Furthermore, each liquid crystal diffraction unit is configured to change a deflection direction of light passing through each liquid crystal diffraction unit when voltages are applied to the first electrode and the strip sub-electrodes.

Methods and devices for improving visual perception in challenging vision environments and for some with low vision conditions (including age related macular degeneration, AMD) are disclosed. A plurality of frequently co-pathological conditions that together make undistorted, clear and bright vision challenging are dealt with by managing the nature, amounts and patterns of light reaching the eyes while managing the sensitivity and dynamic ranges of the eyes. For example, the sensitivity of chromophore response to particular wavelengths and the instant status of the visual transduction system are, in some embodiments, measured, monitored and managed.