An apparatus comprising a switchable optical filter comprising a layer of switchable material, the switchable material comprising a photochromic/thermochromic, a photochromic/photochromic, or a photochromic/electrochromic compound; a first light source providing light of a wavelength that causes the switchable material to transition from a faded state to a dark state, or a dark state to a faded state; and a switch for controlling activation of the first light source

An apparatus comprising a switchable optical filter comprising a layer of switchable material, the switchable material comprising a photochromic/thermochromic, a photochromic/photochromic, or a photochromic/electrochromic compound; a first light source providing light of a wavelength that causes the switchable material to transition from a faded state to a dark state, or a dark state to a faded state; and a switch for controlling activation of the first light source

Provided are a composition for a light transmittance control film, and a light transmittance control film. According to the inventive concept, the light transmittance control film includes a matrix part including a copolymer and a polymer chain which is grafted to the copolymer; and a dispersed part including a polymer derived from a first monomer, and are provided in the matrix part, wherein the polymer chain is derived from the first monomer, first light transmittance is shown while external force is applied, and second light transmittance which is greater than the first light transmittance may be shown after the external force is removed.

A transmittance-variable film and a use thereof, where the transmittance-variable film can control pretilt of a liquid crystal interface by applying a liquid crystal alignment film containing splay oriented liquid crystal molecules, and can vertically and horizontally orient a liquid crystal layer or a liquid crystal interface according to an average tilt angle of the liquid crystal alignment film to ensure uniformity of driving and fast response speed. In addition, by applying a liquid crystal alignment film, the transmittance-variable film can be implemented in various modes with a simple coating-drying-curing method excluding the rubbing process by controlling an arrangement of liquid crystal molecules in a liquid crystal alignment film other than the pretilt control method using the conventional rubbing method.

A transmittance-variable film and a use thereof, where the transmittance-variable film can control pretilt of a liquid crystal interface by applying a liquid crystal alignment film containing splay oriented liquid crystal molecules, and can vertically and horizontally orient a liquid crystal layer or a liquid crystal interface according to an average tilt angle of the liquid crystal alignment film to ensure uniformity of driving and fast response speed. In addition, by applying a liquid crystal alignment film, the transmittance-variable film can be implemented in various modes with a simple coating-drying-curing method excluding the rubbing process by controlling an arrangement of liquid crystal molecules in a liquid crystal alignment film other than the pretilt control method using the conventional rubbing method.

The present invention concerns an optical system for spatiotemporally shaping the wavefront of the electric field of a light beam (1) to be projected into a target volume (5), where the propagation axis is axis z, to create 3D patterned illumination in the target volume (5), comprising a pulsed laser source, configured to have an illumination pattern whose transversal surface at the target volume being superior to the diffraction limit of the optical system, at least one intermediate optical element (4) which is a dispersive grating for performing temporal focusing of the light beam (1), located, on the propagation axis (z), where an image of the illumination pattern is formed, for modulating the phase and/or the amplitude of the electric field of the light beam, and a second optical element (3) which is a spatiallight modulator for modulating the phase of the electric field of the input light beam, and for realizing spatiotemporal multiplexing to create 3D patterned illumination in the target volume (5) by replicating the illumination pattern, so as to have several replicated illumination patterns in the target volume (5), and controlling the position with transversal coordinates X, Y and axial coordinate Z of each replicated illumination pattern in the target volume (5).

The present application relates to an optical device. The present application provides an optical device capable of varying transmittance, and such an optical device can be used for various applications such as eyewear, for example, sunglasses or AR (augmented reality) or VR (virtual reality) eyewear, an outer wall of a building or a sunroof for a vehicle.

The present application relates to an optical device. The present application provides an optical device capable of varying transmittance, and such an optical device can be used for various applications such as eyewear, for example, sunglasses or AR (augmented reality) or VR (virtual reality) eyewear, an outer wall of a building or a sunroof for a vehicle.

The present invention relates to a vehicle head-up display having an external light blocking function, and more particularly, to a vehicle head-up display having an external light blocking function capable of blocking external light from being emitted to a picture generate unit. In the vehicle head-up display having an external light blocking function according to the present invention, the vehicle head-up display includes a case, a screen disposed inside the case, an aspheric mirror disposed at one side of the screen, a folding mirror disposed above the other side of the screen, a picture generate unit disposed under the other side of the screen, a shielding plate which selectively covers an upper surface of the picture generate unit, and an actuator which operates the shielding plate, wherein light generated by the picture generate unit is displayed to an outside via the folding mirror and the aspheric mirror, and when the upper surface of the picture generate unit is covered by the shielding plate operated by the actuator, the shielding plate blocks external light, which is incident via the aspheric mirror and the folding mirror, from being emitted to the picture generate unit.

The present invention relates to a vehicle head-up display having an external light blocking function, and more particularly, to a vehicle head-up display having an external light blocking function capable of blocking external light from being emitted to a picture generate unit. In the vehicle head-up display having an external light blocking function according to the present invention, the vehicle head-up display includes a case, a screen disposed inside the case, an aspheric mirror disposed at one side of the screen, a folding mirror disposed above the other side of the screen, a picture generate unit disposed under the other side of the screen, a shielding plate which selectively covers an upper surface of the picture generate unit, and an actuator which operates the shielding plate, wherein light generated by the picture generate unit is displayed to an outside via the folding mirror and the aspheric mirror, and when the upper surface of the picture generate unit is covered by the shielding plate operated by the actuator, the shielding plate blocks external light, which is incident via the aspheric mirror and the folding mirror, from being emitted to the picture generate unit.