A circularly polarizing plate including a polarizing film, a λ/2 plate having a slow axis in a direction forming an angle of 22.5°±10° relative to an absorption axis of the polarizing film, a λ/4 plate having a slow axis in a direction. forming an angle of 90°±20° relative to the absorption axis of the polarizing film, in this order, wherein the λ/2 plate and the λ/4 plate have different wavelength dispersions, an NZ factor of the λ/2 plate is 1.00±0.05, and an NZ factor of the λ/4 plate is 0.00±0.05, a method for producing the same, and a method for using the same.

The present invention provides an optical film including a light reflection layer, in which the light reflection layer is a layer in which alignment of liquid crystal molecules is immobilized, the liquid crystal molecule forms a helical structure in a film thickness direction of the light reflection layer, and a tilt angle of the liquid crystal molecule is 15° to 55°. The present invention also provides a manufacturing method of the optical film including curing a polymerizable liquid crystal composition including a liquid crystal compound and a chiral agent interposed between a support and another support. In the optical film according to the present invention, an absolute value of oblique retardation is smaller. In the liquid crystal display device including the optical film, front surface brightness is high and an oblique change in the shade is suppressed.

A laminated film includes a plurality of optically anisotropic layers, excellent in transparency, with few point defects, and exhibits little reflected light where the laminated film is applied to a display device brought into a black display state; and a circularly polarizing plate. The laminated film includes first, second, third, and fourth optically anisotropic layers, in order, in which the first, second, third, and fourth optically anisotropic layers are each formed by fixing an aligned liquid crystal compound, an adhesion layer selected from the group consisting of an adhesive layer, and a pressure sensitive adhesive layer is provided on only one of between the first and second optically anisotropic layers, between the second and third optically anisotropic layers, and between the third and fourth optically anisotropic layers, and the laminated film has a minimum transmittance of 60% or more in a wavelength range of 400 to 700 nm.

A display device includes a liquid crystal display panel (3) and a backlight source (2), and further includes a plurality of bandpass filters (1) corresponding to respective pixel units of the liquid crystal display panel (3), the bandpass filters (1) being configured to perform narrowband filtering on the light emergent from the backlight source (2). By adopting the bandpass filters (1), the narrowband filtering on the red, green and blue light is realized by using a narrowband interference filtering method, such that the effect of improving the gamut of the display device is achieved and the high-gamut display is realized.

A display device includes: a color filter including a first transmissive filter, a second transmissive filter, and a third transmissive filter, the first, second and third transmissive filters being configured to transmit respective light beams having peak wavelengths different from each other; a first selective-wavelength-reflection layer adjacent to an optical-input surface of the first transmissive filter, the first selective-wavelength-reflection layer being configured to reflect light of a wavelength band that passes through the third transmissive filter; a second selective-wavelength-reflection layer adjacent to an optical-input surface of the second transmissive filter, the second selective-wavelength-reflection layer being configured to reflect light of a wavelength band that passes through the third transmissive filter, the second selective-wavelength-reflection layer being identical in composition to the first selective-wavelength-reflection layer; and a light emitter configured to emit light that travels toward the color filter.

A display device includes a liquid crystal display operable to selectively transmit light. The display device also includes a switchable mirror that is operable to switch from a pellucid state to a reflective state. The liquid crystal display includes a liquid crystal layer disposed between a first substrate and a second substrate. To preserve color integrity, a color filter and a switchable mirror is also disposed between the first substrate and the second substrate.

A backlight unit includes a light guide plate; a light source provided on a side surface of the light guide plate, and configured to inject light into the light guide plate; a circular polarizing reflective layer provided on a front surface of the light guide plate, and configured to reflect a first polarizing component and transmit a second polarizing component among components of light emitted from the light guide plate; and a cholesteric liquid crystal layer provided on the front surface of the circular polarizing reflective layer and including a plurality of regions, and configured to reflect or transmit the second polarizing component that has passed through the circular polarizing reflective layer according to a voltage applied to each of the plurality of regions.

An electronic device may have a display mounted in a housing. The display may have a pixel array that produces images. A display cover layer may overlap the pixel array. The display cover layer may have a planar central area surrounded by a peripheral edge area with a curved cross-sectional profile. From an on-axis viewing angle, an image on the pixel array is fully viewable through the planar central area and the peripheral edge area. From an off-axis viewing angle, the image is partly viewable through the peripheral edge area and not through the central area. To avoid an undesired color cast in the partly viewable image seen through the peripheral edge area of the display cover layer, the display may be provided with color cast compensation structures such as a guest-host liquid crystal layer that exhibits an anisotropic colored light absorption characteristic, a diffuser layer, and/or other optical structures.

A long-length circularly polarizing plate including: a polarizing film; a λ/2 plate having a slow axis in a direction forming an angle of 22.5°±10° relative to an absorption axis of the polarizing film; and a plate having a slow axis in a direction forming an angle of 90°±20° relative to an absorption axis of the polarizing film, in this order, wherein the λ/2 plate and the λ/4 plate have different wavelength dispersions, and an NZ factor of the λ/4 plate NZq satisfies NZq≦0.0.

A septumless polarizer is an OMT polarizer which is formed without a traditional thin septum which bridges the gap from the first assembly half to the second assembly half when the polarizer is split in the zero-current region of the rectangular waveguides (RHCP and LHCP ports). The septumless polarizer utilizes a dual-axis-stepped feature, which is included in one half of the polarizer only, creates the illusion of a traditional thin septum and actually improves performance. A close-proximity fastener scheme is enabled along with a fully encompassing pressure lip and contact pressure risks are mitigated.