The optical element is an optical element comprising a first optically anisotropic layer which is a cured layer of a liquid crystal composition containing a first disk-like liquid crystal compound, in which the optical element has a liquid crystal alignment pattern in which an optical axis of the first disk-like liquid crystal compound is parallel to a surface of the first optically anisotropic layer, the first optically anisotropic layer is disposed along at least one direction in a plane of the first optically anisotropic layer, and orientation of the optical axis of the first disk-like liquid crystal compound rotationally changes continuously, and the orientation of the optical axis rotates by 180 with a period of 0.5m to 5m.

A 3D display device comprises first and second substrates disposed opposite one another; a liquid crystal layer; a color filter layer between the first substrate and the liquid crystal layer, a plurality of pixel regions arranged in an array being formed on the color filter layer, and each of the plurality of pixel regions comprising first and second sub-pixels; and a first polarizer on a side of the first substrate, the first polarizer comprising a plurality of wire grid polarizers arranged in an array, two adjacent ones of the plurality of wire grid polarizers comprising a plurality of columns of first sub-wire grid polarizers and second sub-wire grid polarizers which are alternately arranged with each other. An orthographic projection of each column of the first and second sub-wire grid polarizers on the pixel regions is overlapped with at least one column of first sub-pixels and second sub-pixels, respectively.

A pixel structure, a liquid crystal display panel, a method of operating the liquid crystal display panel, and a display device are disclosed. The pixel structure includes a light shutter for switching between first and second states, wherein in the first and second states, the light shutter only allows first polarized light having a first polarization direction and second polarized light having a second polarization direction to pass, respectively; a birefringent filter for causing emergent paths of the first and second polarized light to be first and second paths, respectively; a first liquid crystal unit and a first color filter in the first path and corresponding to a first sub-pixel region, wherein the first color filter is at a light-emergent side of the first liquid crystal unit; and a second liquid crystal unit in the second path and corresponding to a second sub-pixel region.

A liquid crystal display panel performs displaying in the normally white mode. A first and a second polarizer are disposed so that the transmission axes thereof are perpendicular to each other. A liquid crystal layer is in a twisted alignment state in the absence of an applied voltage. A first substrate has a first electrode having a plurality of rectangular openings extending in parallel to each other, and a second electrode facing the first electrode with a dielectric layer interposed therebetween. The openings each independently have a width S of more than 0.6 m and not more than 1.4 m, and each pair of adjacent openings independently has a distance L therebetween of not less than 0.3 m and not more than 0.7 m. A first and a second horizontal alignment film each have an azimuthal anchoring energy of not more than 110.sup.4J/m.sup.2.

Provided are a thin stereoscopic image display device that can also deal with a requirement for flexibility and a wearable display device including this stereoscopic image display device. The stereoscopic image display device includes a display panel, an optical element, and a circularly polarizing plate, in which the optical element includes an optically-anisotropic layer that is formed of a liquid crystal compound, the optically-anisotropic layer has a liquid crystal alignment pattern in which a direction of an optical axis derived from the liquid crystal compound changes while continuously rotating along at least one in-plane direction of the optically-anisotropic layer, and circularly polarized light emitted from the display panel is caused to advance in a direction different from a direction in which the circularly polarized light component is incident.

A light source module includes a light guide plate, a light source and a light regulating element. The light guide plate has a first light emitting surface and a second light emitting surface, and a light incident surface connected between the first light emitting surface and the second light emitting surface. The second light emitting surface has a plurality of microstructures. The light source is disposed adjacent to the light incident surface. The light regulating element is disposed adjacent to the second light emitting surface. A dual display device including the light source module, a first display panel and a second display panel is also provided. The first display panel is disposed on a side of the light guide plate facing the first light emitting surface. The second display panel is disposed on a side of the light regulating element that is away from the light guide plate.

A pixel structure, a liquid crystal display panel, a method of operating the liquid crystal display panel, and a display device are disclosed. The pixel structure includes a light shutter for switching between first and second states, wherein in the first and second states, the light shutter only allows first polarized light having a first polarization direction and second polarized light having a second polarization direction to pass, respectively; a birefringent filter for causing emergent paths of the first and second polarized light to be first and second paths, respectively; a first liquid crystal unit and a first color filter in the first path and corresponding to a first sub-pixel region, wherein the first color filter is at a light-emergent side of the first liquid crystal unit; and a second liquid crystal unit in the second path and corresponding to a second sub-pixel region.

An electrically controlled optical screen including a switchable scattering element and an electrically controlled decorating module is provided. The switchable scattering element is disposed on a side of the electrically controlled decorating module and is configured to switch between a scattering state and a transparent state. The electrically controlled decorating module includes a first polarizer, a first quarter-wave plate, a cholesteric liquid crystal layer, an electrically controlled wave plate, a second quarter-wave plate and a second polarizer, which are sequentially stacked. The electrically controlled wave plate has a liquid crystal layer. The second polarizer is disposed between the switchable scattering element and the second quarter-wave plate.

Provided are a phase retardation device, a preparation method therefor, and a display apparatus. The phase retardation device includes: a linear polarization layer, a first alignment layer, a first liquid crystal layer and a second liquid crystal layer; the linear polarization layer is located on one side of a light source; the first alignment layer is located on a side of the linear polarization layer away from the light source; the first liquid crystal layer is located on a side of the first alignment layer away from the light source; the second liquid crystal layer is located on a side of the first liquid crystal layer away from the first alignment layer, the second liquid crystal layer comprises a first subpart adjacent to the first liquid crystal layer, a second subpart and a third subpart.

Simple and cost-effective measurement of polarization components or the complete PSoL (the so-called Stokes parameters) is achieved without any mechanical movements or deformation by using liquid crystal elements. A transmission of a first polarization of light is greater than a transmission of a second orthogonal polarization of light and transmission of the second polarization is greater than 5%. In another of the different states, the device has different levels of transmission of the first and second polarizations of light. At least two orthogonal polarization component values characterizing the light can be resolved by comparing an intensity of light captured in a plurality of the different states.