Provided is an organic EL display device in which blue brightness is improved, and an antireflection function in an oblique direction is enhanced. The problem is solved by ensuring that a polarizer, a phase difference layer, a circularly polarized light separating layer, and a light emitting element are provided from a viewing side, an in-plane retardation Re(550) of the phase difference layer is set to 100 to 160 nm, the circularly polarized light separating layer is a cholesteric liquid crystal layer having a selective reflection center wavelength in a range of 425 to 475 nm, and a sum of retardations Rth(550) in a thickness direction of members arranged between the polarizer and the light emitting element is set to −50 to 50 nm.

The disclosure provides a self-biased magneto-optical non-reciprocal metasurface device. The device includes substrate layer and a sub-wavelength structure layer. The substrate layer is a material layer with a refractive index of 1 to 5 in a microwave frequency band. The sub-wavelength structure layer includes a plurality of square columnar elements arranged in a matrix period with equal period in row and column directions. The square columnar elements include magneto-optical material. The adjustment of phase and amplitude of a circularly polarized electromagnetic wave is achieved by changing the length, width and height of the square columnar elements, and thus the device attains a desired isolation and insertion loss at a center frequency f.sub.0. The parameters of the magneto-optical material are: coercivity Hc≥1000 A/m; remanence Br≥1 kGs; a voigt parameter of a permittivity tensor or permeability tensor in a working frequency band≥0.01.

An electronic device is provided. The electronic device includes a privacy module. The privacy module includes a first polarizing element, a second polarizing element, and a light modulation element. The first polarizing element includes a first light absorbing material. The first polarizing element has a surface, and the surface has a normal direction. The second polarizing element includes a second light absorbing material. The second polarizing element at least partially overlaps the first polarizing element. The light modulation element is disposed between the first polarizing element and the second polarizing element. The first light absorbing material has a first long axis, and the second light absorbing material has a second long axis. The first long axis and second long axis are parallel to the normal direction.

Provided are an optical member in which emission of stray light to the outside can be suppressed and an image display apparatus. The optical member includes: a light guide element including a light guide plate and an incidence diffraction element and an emission diffraction element that are disposed on a main surface of the light guide plate; and a polarization element that blocks transmission of light leaking to a side of the emission diffraction element opposite to an emission side, wherein the emission diffraction element is a polarization diffraction element, the polarization element is disposed on the side of the emission diffraction element opposite to the emission side, and the polarization element is disposed at a position overlapping the emission diffraction element in a plane direction of the main surface of the light guide plate.

Provided is a display device having a thin profile and a high light use efficiency and a head-mounted display including the display device. The display device includes a display panel; a circular polarizer configured to convert display light from the display panel into circularly polarized light and to transmit the circularly polarized light; a patterning mirror including light transmitters and a light reflector, the light transmitters being configured to transmit the circularly polarized light and the light reflector being provided on a surface opposite to a surface facing the circular polarizer; a lens configured to transmit the circularly polarized light transmitted through the patterning mirror; and a circularly polarized light selective reflector configured to selectively reflect the circularly polarized light transmitted through the lens.

An object is to provide an optical element in which a wavelength dependence of refraction of transmitted light is small, and a light guide element including the optical element. The optical element includes: plurality of optically-anisotropic layers that are formed using a composition including a liquid crystal compound and have a liquid crystal alignment pattern in which a direction of an optical axis derived from the liquid crystal compound continuously rotates in one in-plane direction; and a wavelength selective phase difference layer that is disposed between two optically-anisotropic layers and converts circularly polarized light in a specific wavelength range into circularly polarized light having an opposite turning direction, in which, in a case where, in the liquid crystal alignment pattern, a length over which the direction of the optical axis rotates by 180° in the in-plane direction in which the direction of the optical axis changes is set as a single period, a length of the single period in at least one optically-anisotropic layer is different from that of another optically-anisotropic layer.

The present invention provides a composition to form an optically anisotropic film exhibiting excellent reverse wavelength dispersibility, an optically anisotropic film, a circularly polarizing plate; a display device; and a near-infrared absorbing coloring agent. The composition includes a liquid crystal compound or a polymer, and a near-infrared absorbing coloring agent having a structural moiety including a coloring agent skeleton and a mesogenic group that is bonded to the coloring agent skeleton, in which the near-infrared absorbing coloring agent satisfies Condition 1 where an absolute value λ1 of a square root of a first eigenvalue and an absolute value λ2 of a square root of a second eigenvalue satisfy a relationship of Formula (A) λ2/λ1≤0.60; and Condition 2: An angle between a direction of a transition moment of absorption of the infrared absorbing coloring agent and a direction of an eigenvector of the first eigenvalue is 75.0° or more.

A display module includes a display panel, a first optical adhesive layer disposed on a side of a display surface of the display panel, a touch panel disposed on a side of the first optical adhesive layer away from the display panel, and at least one isolation film between the display panel and the touch panel. The display panel includes a display region and a peripheral region that is provided with at least one alignment mark. The touch panel includes a plurality of peripheral signal lines. An orthographic projection of the peripheral signal lines on a plane where the display panel is located at least partially overlaps with an orthographic projection of the at least one alignment mark on the plane. An orthographic projection of each isolation film on the plane covers an alignment mark.

A near eye display (NED) includes multiple PBP optical elements combined with one or more C-plates to improve optical angular performance. The PBP optical elements may be configured for beam steering or for focusing light to a point. A C-plate may reduce or eliminate an undesirable polarization phase shift introduced by the PBP optical elements to angular, off-axis light. Birefringence of the PBP optical elements produces such a polarization phase shift. A C-plate provides an additional polarization phase shift that is opposite to the extra polarization phase shift by the PBP optical elements. Thus, the additional polarization phase shift by the C-plate at least partially reduces the phase shift by the PBP element.

A device for modulation of light (16) having a wavelength, comprising: a first substrate (10) with a first face (81) and a second opposite face (82), and comprising a first electrode (11); a second substrate (20) adjacent to the second face (82) and defining a gap between the first and second substrate (10, 20), the second substrate (20) comprising a second electrode (21); a responsive liquid crystal layer (15) disposed in the gap, wherein the responsive liquid crystal layer (15) has a flexoelectro-optic chiral nematic phase, and is birefringent with an optic axis that tilts in response to an applied electric field between the first and second electrode (11, 21); and a mirror adjacent to the second substrate (20), the mirror configured to reflect incident circular polarised light while preserving its handedness.