Disclosed is an optical assembly having a first variable transmission layer comprising a first electro-optically active material between a first pair of substrates, a second variable transmission layer comprising a second electro-optically active material between a second pair of substrates, and an electronically switchable birefringent layer, that is capable of altering the phase of incident light, situated between the first and second variable transmission layers. The layers are arranged such that light passing through the optical assembly can be altered based on the voltage applied to each layer. The light transmission levels can be altered between maximally transmissive, minimally transmissive, and semi-transparent levels between the maximally and minimally transmissive levels.

Example electrophoretic dispersions for use in electrophoretic displays are provided. An example electrophoretic dispersion includes a first chemical entity and a second chemical entity. The first and second chemical entities are to be induced to reversibly interact to switch between a separated state and an optically active state in response to a change in an electromagnetic field passing through the electrophoretic dispersion to change an optical property of the electrophoretic dispersion. Electrophoretic display devices, methods for operating electrophoretic display devices, non-transitory machine-readable storage mediums, and methods for producing electrophoretic dispersions are also provided.

A display device having a visual angle control film can attenuate an interference phenomenon between a panel and a visual angle control film and effectively shield unnecessary light of a visual angle, the display device comprises a display panel; and a visual angle control film disposed on the display panel, wherein the visual angle control film may include a plurality of light-shielding patterns for shielding light advancing in a side direction except a front direction of the display panel in a visual angle control mode, and each of the plurality of light-shielding patterns may have a thickness in the range of 8% to 25% of a pixel area of the display panel, an interval in the range of 33% to 39% of the pixel size, and a slope angle in the range of ±5° to 15° based on 90°.

A display device having a visual angle control film can attenuate an interference phenomenon between a panel and a visual angle control film and effectively shield unnecessary light of a visual angle, the display device comprises a display panel; and a visual angle control film disposed on the display panel, wherein the visual angle control film may include a plurality of light-shielding patterns for shielding light advancing in a side direction except a front direction of the display panel in a visual angle control mode, and each of the plurality of light-shielding patterns may have a thickness in the range of 8% to 25% of a pixel area of the display panel, an interval in the range of 33% to 39% of the pixel size, and a slope angle in the range of ±5° to 15° based on 90°.

A display device having switchable viewing angle includes a display panel including a first emission area, a second emission area, a third emission area and a fourth emission area, from which light in different wavelength bands is emitted, and a transparent photochromic layer disposed on at least one surface of the display panel, wherein each of the first emission area, the second emission area and the third emission area emits light in a wavelength band of visible light, the fourth emission area emits light in a wavelength band of ultraviolet ray, and when the fourth emission area is in an emission state, an area of the photochromic layer including the area corresponding to the fourth emission area is an opaque area, and wherein when the fourth emission area is in a non-emission state, an area of the photochromic layer including the area corresponding to the fourth emission area is a transparent region, thereby providing a display device capable of switching viewing angles.

A light emitting display panel includes a first emission area, a second emission area, and a third emission area spaced apart from each other and emitting different colors of light and a photochromic layer surrounding each of the first, second, and third emission areas and disposed in a non-emission area. When the first emission area, the second emission area, and the third emission area emit light, the photochromic layer is in a transparent state. When light of a wavelength band shorter than visible light is incident on the photochromic layer, the photochromic layer is in an opaque state.

A light emitting display panel includes a first emission area, a second emission area, and a third emission area spaced apart from each other and emitting different colors of light and a photochromic layer surrounding each of the first, second, and third emission areas and disposed in a non-emission area. When the first emission area, the second emission area, and the third emission area emit light, the photochromic layer is in a transparent state. When light of a wavelength band shorter than visible light is incident on the photochromic layer, the photochromic layer is in an opaque state.

A system includes a first multilayer surface that includes a plurality of layers. The system further includes a plurality of sensors and circuitry. The circuitry receives a plurality of signals from the plurality of sensors and projection data associated with a media content projectable by a projection device. The projection data includes contrast control information associated with the media content. The circuitry determines ambient condition of an enclosed space based on the received plurality of signals. The circuitry selects one or more portions of the plurality of layers of the first multilayer surface based on the determined ambient condition or the projection data. The circuitry controls an opacity level of the selected one or more portions of the first multilayer surface to provide dynamic shade control in the enclosed space or improve contrast of the projected media content based on the determined ambient condition or the projection data.

A light-transmissive multispectral stealth device is disclosed. The light-transmissive multispectral stealth device includes a selective wavelength absorption pattern layer including conductive thin-film patterns, wherein each of the conductive thin-film patterns is made of a material capable of transmitting visible light therethrough and having electrical conductivity, wherein the conductive thin-film patterns are capable of inducing an electromagnetic resonance at a first wavelength and a second wavelength different from the first wavelength; a dielectric layer disposed under the selective wavelength absorption pattern layer and made of a dielectric material capable of transmitting the visible light therethrough, wherein the dielectric layer together with the selective wavelength absorption pattern layer induce the electromagnetic resonance; and a reflective layer disposed under the dielectric layer, wherein the reflective layer is made of a material capable of transmitting the visible light therethrough and reflecting at least a portion of an infrared ray therefrom.

A light-transmissive multispectral stealth device is disclosed. The light-transmissive multispectral stealth device includes a selective wavelength absorption pattern layer including conductive thin-film patterns, wherein each of the conductive thin-film patterns is made of a material capable of transmitting visible light therethrough and having electrical conductivity, wherein the conductive thin-film patterns are capable of inducing an electromagnetic resonance at a first wavelength and a second wavelength different from the first wavelength; a dielectric layer disposed under the selective wavelength absorption pattern layer and made of a dielectric material capable of transmitting the visible light therethrough, wherein the dielectric layer together with the selective wavelength absorption pattern layer induce the electromagnetic resonance; and a reflective layer disposed under the dielectric layer, wherein the reflective layer is made of a material capable of transmitting the visible light therethrough and reflecting at least a portion of an infrared ray therefrom.