An apparatus for recording a holographic device comprises: a master hologram comprising a multiplicity of holographic elements each characterized by one of a predefined set of grating prescriptions; a transparent substrate supporting a layer of holographic material; and a light source. Each holographic element diffracts source light onto a predefined region of the layer. Each prescription modulates at least one of phase, amplitude, and angle of the light. There is further provided a method of recording a holographic device, comprising the steps of: providing said apparatus; exposing the master to illumination from the source; and diffracting light from each holographic element onto a predefined region of the layer.

A phase-shift unit includes: a first substrate and a second substrate provided opposite to each other; a medium layer provided between the first substrate and the second substrate; a microstrip line disposed at a side of the second substrate facing towards the first substrate; and a grounding layer provided at a side of the first substrate facing towards the second substrate and formed with a via hole; wherein a projection of the via hole onto the second substrate and a projection of the microstrip line onto the second substrate have an overlapped area therebetween; and wherein the via hole is configured to feed a phase-shifted microwave signal out of the phase-shift unit, or feed a microwave signal into the phase-shift unit such that the microwave signal is phase-shifted.

A head-mounted display including a transparent display, a first liquid crystal lens and a second liquid crystal lens is provided. The transparent display is adapted to emit an image light beam. The first liquid crystal lens is disposed beside the transparent display. The transparent display is disposed between the first liquid crystal lens and the second liquid crystal lens. The second liquid crystal lens is adapted to receive an ambient light beam. The image light beam passes through the first liquid crystal lens by the phase changing of the first liquid crystal lens, and then the image light beam passes through a pupil.

A grating is provided. The grating includes a first substrate and a second substrate opposite the first substrate, a plurality of first transparent electrodes arranged at equal intervals along a surface of the first substrate and between the first substrate and the second substrate, and a plurality of second transparent electrodes each arranged along a surface of the second substrate and opposite to a respective one of the plurality of first transparent electrodes, and a liquid crystal mixture layer arranged between each pair of the first transparent electrodes and respective second transparent electrodes, wherein a liquid crystal mixture in the liquid crystal mixture layer is switchable between a smectic phase and a cholesteric phase such that the liquid crystal mixture is transparent in the smectic phase and black in the cholesteric phase.

Disclosed are a transflective liquid crystal display device and a driving method thereof. The transflective liquid crystal display device includes: a first surface electrode (103), a first pixel electrode (107), a second surface electrode (113) and a second pixel electrode (112) located in transmissive regions (A); the first surface electrode (103) and first pixel electrode (107) are located between a first substrate (102) and a liquid crystal layer (110), the second surface electrodes (113) and the second pixel electrodes (112) are located between a second substrate (104) and the liquid crystal layer (110). The device further includes: a third surface electrode (104), a reflection layer (105) and a third pixel electrode (108) located in reflective regions (B); the third surface electrode (104), the reflection layer (105) and the third pixel electrode (108) are located between the first substrate (102) and the liquid crystal layer (110). The liquid crystal layer (110) in both the transmissive region (A) and the reflective region (B) of the display device have an equal thickness, thereby drastically reducing the process difficulty of the device while guaranteeing the same phase retardations in both transmissive region and reflective region.

An apparatus for recording a holographic device comprises: a master hologram comprising a multiplicity of holographic elements each characterized by one of a predefined set of grating prescriptions; a transparent substrate supporting a layer of holographic material; and a light source. Each holographic element diffracts source light onto a predefined region of the layer. Each prescription modulates at least one of phase, amplitude, and angle of the light. There is further provided a method of recording a holographic device, comprising the steps of: providing said apparatus; exposing the master to illumination from the source; and diffracting light from each holographic element onto a predefined region of the layer.

An in-plane retardation switching device includes a first substrate, a second substrate, a non-chiral smectic C phase liquid crystal material disposed between the first substrate and the second substrate. The liquid crystal material is of a bulk state. The liquid crystal material has a phase transition sequence of a smectic C phase, a smectic A phase, a nematic phase and an isotropic phase in this order. The liquid crystal material does not have spontaneous polarization and is configured to be driven by quadra-pole momentum of the liquid crystal material.

An internal device having a lightguide which cooperates with an internal light source. A first light coupling element couples an external light source to the lightguide and a second light coupling element extracts the total internal reflection (TIR) from the lightguide. Between the first and second lightguides, an angular grating device and phase grating device are imposed. The angular grating device applies angular diversity to the rays of the TIR light, while the phase grating device applies phase diversity to the rays of the TIR light. Each of the grating devices has a plurality of electrically switchable grating pixels having a unique first and second diffracting state which varies based on the applied voltage.

An optical system includes: a first panel including a plurality of first electrodes extending in a first direction; a second panel facing the first panel and including a plurality of second electrodes extending in a second direction crossing the first direction; an optical conversion layer between the first panel and the second panel; and a first insulating layer between the first electrodes and the second electrodes, the first insulating layer including an organic material, wherein, in a touch mode, one or more of the first electrodes and one or more of the second electrodes crossing each other form a touch sensing capacitor, and wherein, in a multi-view mode, the first electrodes and the second electrodes apply an electric field to the optical conversion layer, the electric field depending on a voltage difference between the first electrode and the second electrode, to generate different phase differences.

An Electrically Switchable Bragg Grating (ESBG) despeckler device comprising at least one ESBG element recorded in a hPDLC sandwiched between transparent substrates to which transparent conductive coatings have been applied. At least one of said coatings is patterned to provide a two-dimensional array of independently switchable ESBG pixels. Each ESBG pixel has a first unique speckle state under said first applied voltage and a second unique speckle state under said second applied voltage.