A display device includes an electrically controlled viewing angle switching device including two polarizers and a liquid crystal cell disposed between the two polarizers. The liquid crystal cell includes two alignment layers and a liquid crystal material layer disposed between the two alignment layers and including a plurality of liquid crystal molecules. A direction of an optical axis of the liquid crystal molecules and a viewing angle control direction of the display device have an included angle 1 of 70-110 degrees. Two alignment directions of the two alignment layers and the viewing angle control direction have an included angle of 9020 degrees and an included angle of 27020 degrees, respectively. Included angles between directions of transmission axis of the two polarizers and alignment directions of the two alignment layers are selected from one of 05 degrees and 905 degrees.

Adaptive laminated panel element for a vehicle window to reduce the effect of glare of a light source comprising a first panel and a second panel, a liquid crystal layer, and at least one connecting layer for connecting the first panel and the second panel with a spacing with respect to one another, wherein the liquid crystal layer is arranged between the first panel and the second panel or is applied to a surface of one of the first panel or the second panel, and wherein transparency of the adaptive laminated panel element is varied by controlling the liquid crystal layer via electrodes, and wherein the connecting layer is a birefringence-free adhesive layer and the laminated panel element is configured as safety glass for use as a vehicle window.

A display device comprises a backlight module, a display panel disposed on the backlight module, and an electrically controlled viewing angle switching device disposed on the backlight module and disposed in a stacking manner with the display panel. The display panel comprises a panel module and a first polarizer. There is an air layer or a bonding layer between the electrically controlled viewing angle switching device and the display panel. The panel module is disposed between the first polarizer and the electrically controlled viewing angle switching device. The electrically controlled viewing angle switching device comprises a liquid crystal cell, at least one phase compensation film and two second polarizers. The liquid crystal cell is disposed between the two second polarizers. The display device can switch between an anti-peeping mode and a sharing mode in an electrically controlled manner.

A switchable privacy display apparatus comprises a polarised output spatial light modulator, and an additional polariser. A reflective polariser, switchable liquid crystal polar control retarder, passive polar control retarders and air gap are arranged between the display output polariser and additional polariser. The passive retarders are arranged to provide no phase difference to polarised light from the spatial light modulator for on-axis light; and simultaneously provide a non-zero phase difference for polarised light in off-axis directions. The polar control retarders are further arranged to achieve low reflectivity for light propagating through the air gap. A switchable privacy display that can be conveniently assembled at low cost can be provided with high contrast images for display users while maintaining high visual security level for off-axis snoopers.

A display panel includes a liquid crystal layer, a negative-type C plate compensation layer, and a B plate compensation layer or an A plate compensation layer, and retardation values provided by the liquid crystal layer and the compensation layers are set to allow light perpendicular to a lateral transmittance angle, which is an angle formed by a transmissive axis of the upper polarizer with respect to a transmissive axis of the lower polarizer when viewed from a specific position on a lateral side, to be transmitted to the upper polarizer when the display panel displays a black color.

A novel copolymer suitable for an optical film which is excellent in optical characteristics and has high retardation even in a thin film state, and an optical film containing the same are provided. A copolymer excellent in optical characteristics and easy to form a composite with a different polymer, and an optical film composed of the same are also provided.

A display comprises a polarised output spatial light modulator, switchable liquid crystal retarder, absorbing polariser and touch panel electrodes. The switchable liquid crystal layer is stabilised by a cured reactive mesogen material during application of an applied voltage. Light scatter in privacy mode is reduced and visual security level enhanced. Visibility of disclinations during application of applied pressure, for example from a finger on a touch screen is minimised.

A switchable privacy display apparatus comprises a polarised output spatial light modulator, and an additional polariser. A reflective polariser, switchable liquid crystal polar control retarder, passive polar control retarders and air gap are arranged between the display output polariser and additional polariser. The passive retarders are arranged to provide no phase difference to polarised light from the spatial light modulator for on-axis light; and simultaneously provide a non-zero phase difference for polarised light in off-axis directions. The polar control retarders are further arranged to achieve low reflectivity for light propagating through the air gap. A switchable privacy display that can be conveniently assembled at low cost can be provided with high contrast images for display users while maintaining high visual security level for off-axis snoopers.

An ultra-thin broadband retardation film is provided. The broadband retardation film includes a first retardation film and a second retardation film. The second retardation film is disposed on a side of the first retardation film, wherein an in-plane retardation value Ro of the first retardation film is between 70 nm and 130 nm, an in-plane retardation value Ro of the second retardation film is between 140 nm and 260 nm, and an angle between an optic axis of the first retardation film and an optic axis of the second retardation film is between 35 and 70.

Disclosed is a transparent display device. The transparent display device includes a first display panel, including a transmissive area and an emissive area where a first pixel including a plurality of subpixels displaying an image is provided, and a second display panel including a second pixel provided to overlap the emissive area and the transmissive area of the first display panel, the second display panel being provided on a first surface of the first display panel. The second pixel of the second display panel controls an amount of light incident on the first display panel, thereby preventing a visibility of an image displayed by the first display panel from being reduced by external light.