A display panel comprises a display substrate, a phase difference layer and a polarizer. The phase difference layer is disposed on a display side of the display substrate. The polarizer is disposed on one side of the phase difference layer which is away from the display substrate. The direction of the absorption axis of the polarizer is parallel to or perpendicular to the stretching direction of the polarizer, and the included angle between the absorption axis of the polarizer and the optical axis of the phase difference layer is not equal to 0° or 90°.

Provided are a polarizing plate and an optical display device comprising same, the polarizing plate comprising a polarizer and a protective film formed on at least one surface of the polarizer, wherein the polarizer has a depolarization region on at least a part thereof, and the polarizer has a crystallization degree of formula 1 of about 60% or greater.

A whiteboard film (100) according to an embodiment of the present invention includes: a diffuse reflection layer (40) to diffuse-reflect visible light; an absorptive polarizing layer (20) having a first transmission axis that is parallel to a first direction; and a reflective polarizing layer (10) being disposed between the diffuse reflection layer (40) and the absorptive polarizing layer (20) and having a second transmission axis that is substantially parallel to the first direction. A whiteboard (100a) according to an embodiment of the present invention includes: a diffuse reflection plate (40a) to diffuse-reflect visible light; an absorptive polarizing layer (20) having a first transmission axis that is parallel to a first direction; and a reflective polarizing layer (10) being disposed between the diffuse reflection plate (40a) and the absorptive polarizing layer (20) and having a second transmission axis that is substantially parallel to the first direction.

A polarizing plate and an optical display apparatus including the same are provided. A polarizing plate includes: a polarizer; a protective layer stacked on a surface of the polarizer; and a retardation layer stacked on another surface of the polarizer, and the protective layer has an in-plane retardation of 3,000 nm or more at a wavelength of 550 nm, an optical axis of the protective layer is tilted at an angle of −2° to +2° with respect to a light absorption axis of the polarizer, and the polarizer has a single transmittance of 44.0% or more and a minimum crossed transmittance of 0.005% or more at a wavelength of 400 nm to 700 nm.

A polarizing plate and an optical display apparatus including the same are provided. A polarizing plate includes: a polarizer; and an optically functional layer and a first protective layer stacked on a light exit surface of the polarizer, and the optically functional layer includes: a resin layer; and acicular microparticles, the resin layer being formed of a composition including an active energy ray curable resin, the acicular microparticles being oriented in an in-plane direction of the optically functional layer, and, where a light absorption axis of the polarizer is 0°, angles between longitudinal directions of the acicular microparticles and the light absorption axis of the polarizer have an average of −10° to +10° and a standard deviation of 15° or less.

An image display device which suppresses destruction of an image display panel due to static electricity carried by a phase difference film, and has excellent adhesiveness between the phase difference film and the image display panel even in a moisture-heat environment, and a circularly polarizing plate with a photosensitive adhesive. The image display device includes a circularly polarizing plate having a linear polarizer and a phase difference film, and an image display panel in this order from a viewing side, in which the phase difference film and the image display panel are bonded by a pressure-sensitive adhesive, the phase difference film has an optically anisotropic layer obtained by polymerizing a polymerizable liquid crystal composition containing at least one kind of polymerizable liquid crystal compound having a predetermined structure, and the pressure-sensitive adhesive contains a polymer having an acid value of 1 to 30 mgKOH/g and an antistatic agent.

A transmittance-variable device is provided in the present application. The present application provides a transmittance-variable device, which can be applied to various applications without causing problems such as a crosstalk phenomenon, a rainbow phenomenon or a mirroring phenomenon, while having excellent transmittance-variable characteristics.

An object of the present invention is to provide an eyewear such as polarized sunglasses using an optical film including a light reflective layer and a polarizing element layer, the eyewear having a metallic color tone conforming to signal visibility standards of various countries, and an optical film and an optical laminate for the eyewear. The present invention provides an optical film obtained by laminating a light reflective layer and a polarizing element layer, in which the optical film satisfies one or more of conditions (a) to (d).

An object of the present invention is to provide a polarizer having a high degree of alignment and an image display device including the polarizer. The polarizer according to the embodiment of the present invention is a polarizer which is formed of a polarizer-forming composition containing a polymer liquid crystal compound and a dichroic material, in which the polymer liquid crystal compound is a thermotropic liquid crystal and a crystalline polymer, and the polymer liquid crystal compound and the dichroic material are horizontally aligned.

A reflective polarizing imaging lens includes at least one optical film having an active area that is curved in two orthogonal directions. Edges of the optical film are arranged to form seams between segments of the optical film in the active area of the reflective polarizing imaging lens.