A double-sided liquid crystal display device is provided, which includes a light guide plate, a light source, a first liquid crystal panel, a second liquid crystal panel and a reflective Dual Brightness Enhancement Film (DBEF). The light guide plate has a light incident side, a first light exit surface and a second light exit surface. The light source is disposed adjacent to the light incident side. The first liquid crystal panel is disposed opposite to the first light exit surface, and a first lower polarizer of the first liquid crystal panel faces the first light exit surface. The DBEF is disposed between the first lower polarizer and the first light exit surface, and a direction of light transmission axis of DBEF is in parallel with that of the first lower polarizer, and the direction of light transmission axis of DBEF is perpendicular to that of the second upper polarizer.

A beverage dispensing head includes a housing having a front, a rear, and a base that extends between the front and the rear. A mixing nozzle is configured to dispense a flow of beverage via the base. A valve is configured to control the flow of beverage via the mixing nozzle, and a switch is movable into and between a closed position in which the valve opens the flow of beverage via the mixing nozzle and an open position in which the valve closes the flow of beverage via the mixing nozzle. A lighting module disposed in the housing is configured to illuminate the front of the housing and the base of the housing when the switch is moved into the closed position.

A light conversion structure, and a backlight module, a color filter substrate, and a display device including the light conversion structure are provided. The light conversion structure includes a light filter structure including a first optical film layer and a second optical film layer alternately arranged and attached to each other in a total number of N, N is an even number, one of a surface of the first optical film layer far away from the second optical film layer and a surface of the second optical film layer far away from the first optical film layer is a light incident surface of the light filter structure, and the other one is a light-exiting surface.

An optical component includes a light guide board. The light guide board can include an incident surface, an underside, and an exit surface. The incident surface is connected to the underside and the exit surface, respectively. The underside is parallel to the exit surface. Further, the exit surface includes a prism structure for refracting light in the light guide board.

An optical system for an augmented reality head mounted display eyepiece that is configured to deliver images to the eye wherein the optical system includes optics. The optics are disposed so as to receive light output from the light source. The optics further arranged with respect to a spatial light modulator such that the light received from the light source passes through the optics and illuminates the spatial light modulator. The light illuminating the spatial light modulator is redirected back through the optics and is coupled into at least one waveguide through at least one in-coupling optical element. At least a portion of the coupled light is ejected from at least one waveguide by at least one out-coupling optical element and directed to the eye of the user.

An apparatus for capturing an image of an object on a platen and including a platen having a surface for receiving the object, wherein the platen is transmissive to an optical wavelength of light, an illumination module configured to illuminate at least a portion of the object with light from an illumination source, and an optical sensing module configured to receive the light from the illumination source after the light interacts with the at least a portion of the object. The light from the illumination source is spatially patterned prior to reaching the object. The illumination module can be configured to create the spatially patterned illumination and/or the platen may include a patterned optical coating creating the spatially patterned illumination. The spatially patterned illumination can include a plurality of discrete areas (e.g., a stepped pattern) of different illumination intensity and/or a gradient of different illumination intensity.

A backlight module includes a first light source, a first light guide plate, and an anti-peeping component, wherein the first light source is an edge-type light source of the first light guide plate, the first light guide plate is provided with a light emitting surface and a backlight surface that are opposite, wherein the anti-peeping component is on the light emitting surface, a refractive index of a dielectric in contact with the backlight surface is less than a refractive index of the first light guide plate; the anti-peeping component includes anti-peeping structures that is provided with a first surface proximal to the first light guide plate, a second surface distal from the first light guide plate, and two opposite third surfaces intersecting both the first surface and the second surface, an included angle between the third surface and the first surface being an obtuse angle.

A microfluidic apparatus is provided. The microfluidic apparatus includes a first substrate; a microfluidic layer on the first substrate and defining a microfluidic channel, wherein the first substrate having a first side closer to the microfluidic layer, and a second side away from the microfluidic layer, the first side and the second side opposite each other; a plurality of detectors on a side of the microfluidic channel away from the first substrate; a unitary grating plate on the second side of the first substrate and including a plurality of grating blocks of different wavelength selectivity; and a light extraction layer including a plurality of light extractors on the first side of the first substrate and configured to extract light diffracted by the plurality of grating blocks out of the first substrate.

A light conversion structure, and a backlight module, a color filter substrate, and a display device including the light conversion structure are provided. The light conversion structure includes a light filter structure including a first optical film layer and a second optical film layer alternately arranged and attached to each other in a total number of N, N is an even number, one of a surface of the first optical film layer far away from the second optical film layer and a surface of the second optical film layer far away from the first optical film layer is a light incident surface of the light filter structure, and the other one is a light-exiting surface.

The invention is notably directed to a transflective display device. The device comprises a set of pixels, wherein each of the pixels comprises a portion of bi-stable, phase change material, hereafter a PCM portion, having at least two reversibly switchable states, in which it has two different values of refractive index and/or optical absorption. The device further comprises one or more spacers, optically transmissive, and extending under PCM portions of the set of pixels. One or more reflectors extend under the one or more spacers. An energization structure is in thermal or electrical communication with the PCM portions, via the one or more spacers. Moreover, a display controller is configured to selectively energize, via the energization structure, PCM portions of the pixels, so as to reversibly switch a state of a PCM portion of any of the pixels from one of its reversibly switchable states to the other. A backlight unit is furthermore configured, in the device, to allow illumination of the PCM portions through the one or more spacers. The backlight unit is controlled by a backlight unit controller, which is configured for modulating one or more physical properties of light emitted from the backlight unit. The invention is further directed to related devices and methods of operation.