A backlight assembly and a display device including the backlight assembly are provided. The backlight assembly includes a light source unit, a peep-proof layer on a light emitting side of the light source unit, a light adjustment layer on a side of the peep-proof layer distal to the light source unit, and a plurality of first microstructures between the peep-proof layer and the light adjustment layer and spaced apart from each other.

A display device comprising a spatial light modulator having a display polariser arranged on one side of the spatial light modulator is provided with an additional polariser arranged on the same side as the display polariser and polar control retarders between the additional polariser and the display polariser. The polar control retarders include a liquid crystal retarder having two surface alignment layers disposed adjacent to a layer of liquid crystal material on opposite sides. The surface alignment layers provide alignment in the adjacent liquid crystal material with an in-plane component, wherein the angle of said in-plane component changes monotonically along a predetermined axis across the display device, providing reduction of luminance in directions that are offset from a viewing axis, increasing uniformity in the reduction of luminance in directions that are offset from a viewing axis.

According to one embodiment, a display device includes a liquid crystal display panel including a first substrate, a second substrate, a first liquid crystal layer, a first polarizer and a second polarizer, a dimming panel including a third substrate, a fourth substrate, a second liquid crystal layer, a third polarizer and a fourth polarizer, a first transparent conductive layer provided on the first substrate, a conductive tape connected to the first transparent conductive layer and a first metal frame formed of a metal material, and the conductive tape is connected to the first metal frame.

According to one embodiment, a display system includes an external light sensor, a display panel, a viewing angle control panel including a liquid crystal layer containing liquid crystal molecules twist-aligned, configured such that a drive voltage applied to the liquid crystal layer is controlled based on an external light intensity detected by the external light sensor, and a polarization axis rotation element disposed between the viewing angle control panel and the display panel. The drive voltage when the external light intensity is less than a threshold value is greater than the drive voltage when the external light intensity is greater or equal to than the threshold value.

A display device includes a viewing angle controlling film includes a first base material, a first electrode disposed on the first base material; a transparent resin layer which is disposed on the first electrode and has a plurality of accommodating units; a second electrode disposed on the transparent resin layer; and a second base material disposed on the second electrode, and an ink including a charged hollow carbon black and a solvent is accommodated in each of the plurality of accommodating units, thus the viewing angle controlling film has an excellent dispersion stability and the settling of the particles due to the gravity is suppressed to improve a driving characteristic.

A display device includes a backlight module, a liquid crystal display panel and an optical module. The liquid crystal display panel is disposed on the backlight module. The liquid crystal display panel includes an array substrate, an opposite substrate, a display medium layer, an upper polarizing pattern, and a lower polarizing pattern. The upper polarizing pattern is disposed on the opposite substrate. The lower polarizing pattern is disposed on the array substrate and has a first transmission axis. The optical module is disposed between the backlight module and the liquid crystal display panel. The optical module includes a dual brightness enhancement film. The dual brightness enhancement film has a second transmission axis. The polarization direction of the light after passing through the optical module is different from the polarization direction of the light after passing through the lower polarizing pattern.

A switchable directional backlight for a privacy display comprises a waveguide with first and second opposing input ends and a turning film arranged to collect light output from the waveguide for input into a spatial light modulator. The waveguide has an array of light deflecting features arranged on one guiding surface and an opposing planar surface. Light deflecting features are arranged such that light input from the first input end is output with a narrow angular range and light input from the second input end is output with a wide angular range.

A privacy display comprises a spatial light modulator and a compensated switchable liquid crystal retarder arranged between first and second polarisers arranged in series with the spatial light modulator. In a privacy mode of operation, on-axis light from the spatial light modulator is directed without loss, whereas off-axis light has reduced luminance. The visibility of the display to off-axis snoopers is reduced by means of luminance reduction over a wide polar field. In a wide angle mode of operation, the switchable liquid crystal retardance is adjusted so that off-axis luminance is substantially unmodified.

A peeking prevention system has: a display device having, on a front surface of a display screen, a first polarization layer that has a first absorption axis parallel to a first direction; and a room partition that partitions a space in which a display is provided by the display device from a surrounding space, the room partition having a translucent part that makes it possible to see into the space, the translucent part including a transparent substrate and a second polarization layer that is positioned on the space side of the transparent substrate and that has a second absorption axis parallel to a second direction, wherein: the system furthermore has a phase contrast film that is positioned on the front surface of the first polarization layer; the phase contrast layer has a delay axis parallel to a third direction; and transparency is reduced when the display screen is viewed.

A peeking prevention system includes: a display device having a display plane emitting polarized light; a partition to delimit from the surroundings a space in which displaying is to be provided by the display device, the partition having a light-transmitting portion through which the inside of the space is viewable; and an optical stack opposed to the display plane of the display device. The light-transmitting portion includes a transparent substrate and a first polarizing layer having a first absorption axis that is parallel to a first direction. The optical stack includes a second polarizing layer having a second absorption axis that is parallel to a second direction, the second direction being orthogonal to the first direction, and a first phase difference layer at a side of the second polarizing layer facing the display plane. The first phase difference layer has an in-plane retardation of 4000 nm or more.