A liquid crystal display device is provided in which a tint change in case of being seen from an oblique direction at the time of black display is suppressed. The liquid crystal display device includes: a liquid crystal cell and a pair of polarizing plates that are disposed such that the liquid crystal cell is interposed between the pair of polarizing plates, in which a tilt angle of the liquid crystal compound is 1.0 or less, respective color filters that are disposed on respective pixel regions of the liquid crystal cell are provided between the pair of polarizing plates, Rth of the respective color filters satisfy predetermined requirements, the polarizing plate that is disposed on the visible side among the pair of polarizing plates includes an optical compensation layer and a polarizer in this order from the liquid crystal cell side, and the optical compensation layer satisfies a predetermined requirement.

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.

An optically anisotropic layered body including a first optically anisotropic layer and a second optically anisotropic layer, wherein the first optically anisotropic layer satisfies 220 nm<Re1(590)<330 nm, Re1(450)/Re1(550)1.0, Re1(650)/Re1(550)1.0, and 0.95<NZ1<2.00, and the second optically anisotropic layer satisfies 110 nm<Re2(590)<165 nm, Re2(450)/Re2(550)1.0, Re2(650)/Re2(550)1.0, and 1.5NZ20.00.

An optical element comprising a stacked liquid crystal (LC) structure for rotating polarization (e.g., handedness) of an incident circularly polarized light over a broad wavelength and incident angle for head-mounted displays (HMD)s display application is proposed. The stacked LC structure has a dual cell structures, which includes at least a first LC cell and a second LC cell, and the stacked LC structure rotates the polarized light for a broad band of light (e.g., visible spectrum) over a given field a view. The performance of designed dual LC cells structures may be optimized for narrow band wavelength and a narrow incident angle for different application cases.

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.

Provided is a liquid crystal display device having a viewing-side polarizing plate, a liquid crystal panel and a light source-side polarizing plate, which are stacked sequentially, wherein the viewing-side polarizing plate comprises a first polarizer and a first protective film formed on a light output surface of the first polarizer, the light source-side polarizing plate comprises a second polarizer and a fourth protective film formed on a light incident surface of the second polarizer, and the TD shrinkage ratio of the fourth protective film is greater than the TD shrinkage ratio of the first protective film.

Provided are an optical element that can achieve both color difference control and luminance reduction at an oblique viewing angle, and a liquid crystal display device including the optical element and having excellent display quality. The optical element includes: a first polarizer; a first phase difference layer; a second phase difference layer; and a second polarizer, the first polarizer, the first phase difference layer, the second phase difference layer, and the second polarizer being arranged in the stated order, the first phase difference layer satisfying the formula nx>nynz, the second phase difference layer satisfying the formula nz>nxny, the first polarizer and the second polarizer being linear polarizers, transmission axes of the first polarizer and the second polarizer being parallel to each other, a slow axis of the first phase difference layer being orthogonal to a polarization axis of the first polarizer.

Polarization-based optical angle-filters disclosed herein can be engineered to transmit a prescribed amount of light as a function of incidence angle and azimuth. Such filters can transmit light without introducing artifacts, making them suitable for the image-path of an optical system. One example may include an angle-filter having an input circular polarizer, an analyzing circular polarizer, and a retarder positioned between the circular polarizers, the retarder having a thickness-direction retardation. The thickness-direction retardation of the retarder (R.sub.th) is selected to produce a prescribed angle-of-incidence dependent transmission function, and the circular polarizers reduce the amount of azimuth-dependence in the transmission function.

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 display device in which ambient light reflections, for example, from IPS or FFS type displays are reduced by a circular polariser (e.g., linear polariser combined with external quarter waveplate) to make the light circular polarized, as it traverses the multiple reflective layers between the polariser and LC layer, and then an internal quarter waveplate converts the light back to linear polarisation before it enters the LC, so the display can operate as normal, while the circular polariser absorbs unwanted reflections of ambient light from within the display.