Abstract: A liquid crystal display device includes a first substrate, a second substrate disposed on a viewer side relative to the first substrate, a liquid crystal layer provided between the first substrate and the second substrate, a polarizer disposed on the viewer side relative to the liquid crystal layer, and a phase difference layer disposed between the polarizer and the liquid crystal layer, and also includes a plurality of pixels arrayed in a matrix shape. The first substrate includes a reflective layer that reflects light, a first electrode and a second electrode that can generate a transverse electrical field in the liquid crystal layer, and a first horizontal alignment film in contact with the liquid crystal layer. The second substrate includes a second horizontal alignment film in contact with the liquid crystal layer. The liquid crystal layer takes a twist alignment when no voltage is applied.

Abstract: A multi-spectral optical imaging device includes a switchable element configured to be switched between first and second states, one of which alters a polarization of light, and a geometric phase element arranged to receive the light from the switchable element. The geometric phase element is configured to diffract a first wavelength band of the light to alter a direction of propagation thereof based on the polarization and without substantially altering a direction of propagation of a second wavelength band of the light, responsive to the first state of the switchable element. Related optical shutters and multi-spectral optical detectors are also discussed.

Abstract: Provided are a liquid crystal panel capable of achieving a small light-shielding angle in a narrow viewing angle mode and a display device including the liquid crystal panel. The liquid crystal panel sequentially includes: a first polarizing plate with a first absorption axis; a first substrate including a first electrode; a liquid crystal layer containing liquid crystal molecules; and a second substrate including a second electrode, wherein in a plan view, a director of the liquid crystal molecules with no voltage applied and the first absorption axis form an angle ? of not smaller than 5° and not greater than 20° or not smaller than 65° and not greater than 80°.

Abstract: Provided is a phase difference plate including a substrate and a phase difference film which is an oblique film, in which, in a case where three principal refractive indices in a biaxial refractive index ellipsoid exhibiting the refractivity anisotropy are defined as nx, ny, and nz, Conditional Expression (1) is satisfied, and in a case where an incidence angle in a direction inclined to the X-axis side with respect to the normal line is regarded as positive, a phase difference ratio Re(30) ratio, which is a ratio of Re(+30) of a phase difference of the incidence light with an incidence angle of +30° to Re(?30) of a phase difference of the incidence light with an incidence angle of ?30°, satisfies Conditional Expression (2). ny>nx>nz??(1) Re(30) ratio=Re(30)/Re(?30)=1.1 to 4.

Abstract: A display apparatus including a backlight module, first and second electrically-controlled elements, electrically-controlled first and second polarizers, a half-wave plate, and a display panel is provided. An included angle between first and second alignment directions of first and second alignment layers of the first electrically-controlled element is between 75 degrees and 105 degrees. An included angle between third and fourth alignment directions of third and fourth alignment layers of the second electrically-controlled element is between 165 degrees and 195 degrees. A first absorption axis of the first polarizer disposed between the backlight module and the first electrically-controlled element is perpendicular to a second absorption axis of the second polarizer disposed between the first and second electrically-controlled elements. The half-wave plate is disposed between the second polarizer and the second electrically-controlled element.

Abstract: A display apparatus including a backlight module, first and second electrically-controlled elements, electrically-controlled first and second polarizers, a half-wave plate, and a display panel is provided. An included angle between first and second alignment directions of first and second alignment layers of the first electrically-controlled element is between 75 degrees and 105 degrees. An included angle between third and fourth alignment directions of third and fourth alignment layers of the second electrically-controlled element is between 165 degrees and 195 degrees. The half-wave plate is disposed between the second polarizer and the second electrically-controlled element. The display panel is disposed on the second electrically-controlled element. An included angle between an extending direction of prism structures of each of two optical brightness enhancement films of the backlight module and a viewing angle control direction of the display apparatus is less than 45 degrees.

Abstract: A dimming agent according to one or more embodiments is disclosed that may include at least one of terbium, praseodymium, manganese, titanium. A diffuse reflection intensity of the dimming agent in a wavelength of from 400 nm to 750 nm may be 80% or less.

Abstract: A display comprises a polarised output spatial light modulator, switchable liquid crystal retarder, absorbing polarizer 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.

Abstract: A zoned waveplate has a series of transversely stacked birefringent zones alternating with non-birefringent zones. The birefringent and non-birefringent zones are integrally formed upon an AR-coated face of a single substrate by patterning the AR coated face of the substrate with zero-order sub-wavelength form-birefringent gratings configured to have a target retardance. The layer structure of the AR coating is designed to provide the target birefringence in the patterned zones and the reflection suppression.

Abstract: A phase difference compensation element, including: a transparent substrate; a first optical anisotropic layer that includes an inorganic material, and has a C-plate retardance; and a second optical anisotropic layer that includes an inorganic material, and includes an oblique angle vapor deposition film that does not have an O-plate retardance, wherein the phase difference compensation element including the first optical anisotropic layer and the second optical anisotropic layer in combination has a quasi-O-plate retardance.

Abstract: A polarizing plate for IPS mode and an optical display apparatus including the same are provided. A polarizing plate includes: a polarizer; a first protective layer on an upper surface of the polarizer; and a second protective layer on a lower surface of the polarizer, wherein, assuming an axis of the polarizer having a high index of refraction in an in-plane direction of the polarizer is a reference axis (0°), an angle of an axis of the first protective layer having a low index of refraction in the in-plane direction thereof is in a range of about ?5° to +5°, the first protective layer has an in-plane retardation Re of about 5,000 nm or more at a wavelength of 550 nm, the second protective layer includes a positive C plate layer, and the second protective layer satisfies at least one of Relations 1 and 2.

Abstract: 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.

Abstract: 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.

Abstract: A viewing angle switchable display apparatus including a display panel, an electrically controlled viewing angle switching device, an electrically controlled light scattering switching device, and a backlight module is provided. The electrically controlled viewing angle switching device includes two first transparent substrates, two first transparent conductive layers, a liquid crystal layer, and a first polarizer located on a side of the electrically controlled viewing angle switching device which is far away from the display panel. The liquid crystal layer includes liquid crystal molecules, and optical axes of the liquid crystal molecules are parallel or perpendicular to a transmission axis of the first polarizer. The electrically controlled light scattering switching device is located between the display panel and the backlight module and includes two second transparent substrates, two second transparent conductive layers, and an electronically controlled polymer material layer.

Abstract: There is provided a liquid crystal display apparatus having sufficiently small black brightness in an oblique direction. A liquid crystal display apparatus according to an embodiment of the present invention includes: a liquid crystal cell including a viewer-side substrate, a back surface-side substrate, and a homogeneously aligned liquid crystal layer sandwiched therebetween; a first polarizer arranged on a viewer side of the liquid crystal cell; a second polarizer arranged on a back surface side of the liquid crystal cell; a first optical compensation layer arranged between the liquid crystal cell and the first polarizer; and a second optical compensation layer arranged between the liquid crystal cell and the second polarizer. The viewer-side substrate and the back surface-side substrate each have a thickness direction retardation Rth(550) of from ?10 nm to 100 nm, and a product A×E is 300 or less.

Abstract: The present application relates to an optical film, an optical element and an imaging device. The optical film of the present application does not only exhibit broadband polarization conversion characteristics in the visible light region, but also has absorption bands in the visible light region. Such an optical film can be applied to an imaging device such as an augmented reality apparatus as an optical element such as a diffractive light guide plate laminate to suppress crosstalk.

Abstract: A near eye display (NED) includes multiple PBP optical elements combined with one or more C-plates to improve optical angular performance. The PBP optical elements may be configured for beam steering or for focusing light to a point. A C-plate may reduce or eliminate an undesirable polarization phase shift introduced by the PBP optical elements to angular, off-axis light. Birefringence of the PBP optical elements produces such a polarization phase shift. A C-plate provides an additional polarization phase shift that is opposite to the extra polarization phase shift by the PBP optical elements. Thus, the additional polarization phase shift by the C-plate at least partially reduces the phase shift by the PBP element.

Abstract: A viewing angle switch module including a viewing angle limiting device and a first electrically controlled viewing angle switch device is provided. A plurality of first block walls of the viewing angle limiting device are arranged along a first direction and extended in a second direction. The first electrically controlled viewing angle switch device has a first liquid crystal layer, a first polarizer and a second polarizer. An angle of 90±20 degrees is included between an optical axis of the first liquid crystal layer and the first direction. The first polarizer and the second polarizer are respectively located at two opposite sides of the first liquid crystal layer. An absorption axis of the first polarizer and a, absorption axis of the second polarizer are parallel to or perpendicular to the first direction. A display apparatus adopting the viewing angle switch module is also provided.

Abstract: A device for manipulating the polarization of light which includes a first retarder-stack (Stack 1) that converts the polarization of input light from a first polarization basis vector (PBV1) to a second polarization basis vector (PBV2), a second retarder-stack (Stack 2) that returns the polarization of light from PBV2 to PBV1, and one or more optically functional layers between Stack 1 and Stack 2. Stack 1 has a plurality of layers, wherein the number of layers, retardation values, and orientations of layers in Stack 1 are selected to produce a PBV2 that is substantially spectrally-uniform over a prescribed range of wavelengths. PBV1 is a non-trivial eigen-polarization of combined Stack 1 and Stack 2. Stack 2 has a plurality of layers and Stack 2 is arranged in series with Stack 1. Alternatively, instead of two different stacks, a reflector may be used to produce a return pass through Stack 1.

Abstract: An optical waveplate is provided. The optical waveplate includes a plurality of liquid crystal (“LC”) layers stacked together. At least one of the plurality of LC layers includes LC molecules that are in-plane switchable by an external field to switch the optical waveplate between states of different phase retardances.

Abstract: The present invention aims to provide an image display device including an optical film having a thickness suitable for practical use without including any special inorganic material, wherein the image display device has high color rendering properties and is capable of minimizing the occurrence of blackout and interference colors (rainbow unevenness) even when the image display device includes light sources that emit light having a narrow emission spectrum. The present invention provides an image display device including an optical film having an in-plane birefringence and a polarizer in this order, wherein the optical film and the polarizer are disposed to form an angle of about 45° between a slow axis of the optical film and an absorption axis of the polarizer, the optical film has a retardation of 3000 nm or more, and light incident on the optical film provides at least 50% coverage of ITU-R BT.2020.

Abstract: A method for directing light beams includes generating a light beam along a light path. A voltage differential is created by generating a voltage in a first and second linear electrode contacts arranged such that the first and second linear electrical contacts alternate with each other. The light path is altered by passing the light beam through a liquid crystal device coupled to the first and second linear electrical contacts.

Abstract: 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.

Abstract: An array substrate, a display panel and a display device are disclosed. The array substrate includes a first data line and a second data line which extend substantially along a first direction and are adjacent to each other, a first gate line and a second gate line that extend substantially along a second direction intersected with the first direction and are adjacent to each other, and at least two sub-pixels which are sequentially arranged in parallel along the first direction; the first gate line and the second gate line are disposed at two sides of the at least two sub-pixels in the first direction, respectively.

Abstract: A manufacturing method of a display device is disclosed. The method includes the following steps. A first substrate having a first region and a second region is provided. A second substrate is disposed on the first substrate. The second substrate is overlapping the first region. At least one drive IC is disposed on the second region. A protection layer is disposed on the second region. The protection layer is disposed enclosing the at least one drive IC. The protection layer has a maximum height larger than a maximum height of the at least one drive IC.

Abstract: A multi-function light-adjusting glass includes first and second substrates delimiting an intermediate space therebetween, a light-adjusting layer disposed in the intermediate space, and a first polarizing board located at an outer side of the first substrate away from the intermediate space, and a second polarizing board located at an outer side of the second substrate away from the intermediate space. Each substrate includes an electrically conductive film on an inner surface of the substrate facing the intermediate space, and an alignment film disposed between the electrically conductive film and the intermediate space. The two alignment films respectively have two alignment directions orthogonal to each other. The light-adjusting layer includes liquid crystal molecules and salt-in ions.

Abstract: 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.

Abstract: An in-plane switching (IPS) mode liquid crystal display (LCD) device includes a liquid crystal display panel having a first substrate, a second substrate, and a liquid crystal layer between the first and second substrates; a second polarizer on an outer surface of the second substrate, the second polarizer having a second polarizing element; and an in-cell retarder on an inner surface of the second substrate, wherein the in-cell retarder compensates a light leakage in a front direction of the liquid crystal display panel.

Abstract: A substrate detection device and method are provided. The substrate detection device includes: a base platform; and a birefringence structure; the base platform comprising a light source and a bearing platform; the bearing platform being configured to place the substrate to be detected; the light source being configured to illuminate the substrate to be detected from one side, close to the bearing platform, of the substrate to be detected. The phase difference of the lights is increased by a birefringence structure layer, such that interfere may happen with some lights having a relatively smaller phase difference. The difference in brightness of different regions on the light-outgoing side of the birefringence structure layer increases, such that the non-uniformity on the substrate manifests more easily. Therefore, the effect of avoiding the missed detection is achieved.

Abstract: The present invention provides: an optical laminate comprising at least two films, the optical laminate comprising at least a film A satisfying a given condition (1) and a film C satisfying a given condition (2), wherein a retardation value Re(0) observed in a direction of an axis perpendicular to a plane of the optical laminate is 4,000 to 30,000 nm, and a retardation value Re(40) observed in a direction of an axis tilted from the axis perpendicular to the plane of the optical laminate toward a slow axis by 40 degrees in a plane lying perpendicular to the plane of the optical laminate and extending along the slow axis is 4,000 to 25,000 nm, the slow axis being an axis along which refractive index is highest in a plane of the film A; and a display device comprising the optical laminate.

Abstract: An object of the invention is to provide a novel laminate and a novel image display device which have both of a gas barrier function and a circular polarization conversion function and have a reduced thickness as compared to those in the related art. A laminate of the invention has a substrate, an inorganic layer, an alignment film, and an organic layer in this order, and the organic layer contains a liquid crystal compound.

Abstract: The present application discloses a liquid crystal lens. The liquid crystal lens comprises: a first electrode; a second electrode; a liquid crystal layer located between the first and the second electrode; a third electrode, located at a side of the first electrode away from the liquid crystal layer; and a driving means. The driving means is configured to: in a 3D display mode, apply voltages to the first and the second electrode to generate an electric field, such that liquid crystal molecules in the liquid crystal layer are deflected to a first state and form a plurality of lens units, and when switching from the 3D display mode to a 2D display mode, apply voltages to the first and the third electrode to generate an electric field, such that the liquid crystal molecules in the liquid crystal layer are deflected to a second state and form no lens unit.

Abstract: An in-plane switching (IPS) mode liquid crystal display (LCD) device includes a liquid crystal display panel having a first substrate, a second substrate, and a liquid crystal layer between the first and second substrates; a second polarizer on an outer surface of the second substrate, the second polarizer having a second polarizing element; and an in-cell retarder on an inner surface of the second substrate, wherein the in-cell retarder compensates a light leakage in a front direction of the liquid crystal display panel.

Abstract: An object of the invention is to provide a novel laminate and a novel image display device which have both of a gas barrier function and a circular polarization conversion function and have a reduced thickness as compared to those in the related art. A laminate of the invention has a substrate, an organic layer A, an inorganic layer B, and an organic layer B in this order, and at least one of the organic layer A or the organic layer B contains a liquid crystal compound.

Abstract: The present invention provides a polarizer excellent in transmittance even if it includes a light-transmitting substrate having no in-plane phase difference. The present invention relates to a polarizer configured to be disposed on a backlight source side in an image display device, the polarizer including at least a light-transmitting substrate having in-plane birefringence and a polarizing element layered in said order from the backlight source side, the light-transmitting substrate receiving incidence of polarized light, the light-transmitting substrate and the polarizing element being layered such that a fast axis of the light-transmitting substrate along a direction in which the substrate shows a smaller refractive index and a transmission axis of the polarizing element form an angle of 0°±30° or 90°±30°.

Abstract: According to one embodiment, a liquid crystal display device includes an array substrate, a counter-substrate, a negative liquid crystal layer including liquid crystal molecules, a retardation film attached to a surface of the array substrate, a first polarizer attached to the retardation film and having a first absorption axis, a second polarizer attached to a surface of the counter-substrate, and having a second absorption axis which is parallel to a direction of initial alignment of the liquid crystal molecules and perpendicular to the first absorption axis, a cover member located opposite to the second polarizer, and ultraviolet curing resin which bonds the second polarizer and the cover member to each other.

Abstract: A multilayer film including: a first long-length substrate; and an optically anisotropic layer that is formed directly on the first substrate and contains cured liquid crystal molecules, wherein the first substrate has an Nz factor of 1.1 to 3.0, variation of orientation angle of 1.0° or less, and an orientation-regulating force caused by stretching, and an angle formed between a slow axis of the first substrate and a widthwise direction of the first substrate is 0° or more and less than 90°; and manufacturing method and use thereof.

Abstract: [Object] In a touch screen in which an electrode portion is formed on a base film, a pattern of the electrode portion is made less visible. [Solution] A touch screen 1 includes a first base film 11, a first transparent electrode 15, a second base film 13, a second transparent electrode 17, and a second intermediate base film 21. The first transparent electrode 15 is formed on the first base film 11. The second base film 13 is placed to face the first base film 11. The second transparent electrode 17 is formed on the second base film 13. The second intermediate base film 21 has a retardation value of 3000 nm or more and is placed so that a contraction direction thereof and contraction directions of the first base film 11 and the second base film 13 are matched.

Abstract: Optical film stacks are described. More particularly, optical film stacks including a half-wave retardation layer are described. Achromatic half-wave retardation layers, including achromatic half-wave layers formed from a quarter-wave and a three-quarters-wave retardation layer, are described. Film stacks including reflective polarizers tuned to reduce wavelength dispersion of the half-wave retardation layer are also described.

Abstract: An environmental seal is formed around a square sensor disposed beneath a circular button cap within a button assembly. The button assembly includes shelf portions each extending separately into the interior of the assembly from a sidewall of the assembly. Portions of the sidewall are exposed between the shelf portions large enough to permit the four corners of the square sensor to contact the sidewall. The button cap is set above the sensor, resting upon the shelf portions. A first sealant bonds the top faces of the shelf portions to the bottom of the button cap. A second sealant bonds the edges of the sidewall to the corners of the sensor. The second sealant interfaces with the first sealant to form a complete environmental seal.

Abstract: According to one embodiment, a liquid crystal display device includes an array substrate, a counter-substrate, a negative liquid crystal layer including liquid crystal molecules, a retardation film attached to a surface of the array substrate, a first polarizer attached to the retardation film and having a first absorption axis, a second polarizer attached to a surface of the counter-substrate, and having a second absorption axis which is parallel to a direction of initial alignment of the liquid crystal molecules and perpendicular to the first absorption axis, a cover member located opposite to the second polarizer, and ultraviolet curing resin which bonds the second polarizer and the cover member to each other.

Abstract: A functional polarizing film includes a polarizing layer, at least one moisture-binding layer on a first surface of the polarizing layer, and at least one moisture-blocking layer disposed on a first surface of the moisture-binding layer.

Abstract: An organic light emitting diode display including: a display panel; a first retarder on the display panel and including a first reactive liquid crystal; a second retarder on the first retarder and including a second reactive liquid crystal; and a polarizer on the second retarder, wherein a first optical axis of the first reactive liquid crystal is inclined by 2?+45° relative to an absorption axis of the polarizer, and a second optical axis of the second reactive liquid crystal is inclined by ? relative to the absorption axis of the polarizer.

Abstract: The present invention provides a touch LCM comprising an array substrate and a color film substrate provided opposite to each other, wherein an optical film set is provided at a side of the color film substrate away from the array substrate, comprising a touch signal feedback layer, a touch signal receiving layer and an upper polarizer film provided there between. With the design of integrating the upper polarizer film, the touch signal feedback layer and the touch signal receiving layer into the optical film set, the optical film set has both the polarizing function in the conventional sense and the function of touch electrode.

Abstract: A compensation film includes: a first retardation layer including a polymer; a second retardation layer including a liquid crystal having positive birefringence; and a compensation layer including a liquid crystal having a vertical alignment property, where an angle between slow axes of the first and second retardation layers is in a range of about 85 to about 95 degrees, an entire in-plane retardation (Re0) of the first retardation layer, the second retardation layer and the compensation layer for wavelengths of 450 nm, 550 nm and 650 nm satisfy the following inequation: Re0(450 nm)<Re0(550 nm)<Re0(650 nm), an in-plane retardation (Re3) of the compensation layer for the incident light having a wavelength of about 550 nm is in a range of about zero to about 50 nm, and a thickness direction retardation (Rth3) of the compensation layer for the incident light is less than zero.

Abstract: An embodiment of present invention discloses a liquid crystal display provided with viewing angle compensation. The liquid crystal display provided with viewing angle compensation comprises a liquid crystal cell in a vertical arrangement, upper and lower polarizer sheets, and further comprises the first biaxial compensation film provided between the liquid crystal cell and the lower polarizer sheet, the second biaxial compensation film provided between the liquid crystal cell and the upper polarizer sheet, and a monoaxial compensation film provided at the upside and/or downside of the liquid crystal cell. The embodiment of present invention may be applicable for the viewing angle compensation in wide viewing-angle techniques.

Abstract: A pressure-sensitive adhesive layer-attached polarizing film of the invention includes: a polarizing film; and a pressure-sensitive adhesive layer provided on the polarizing film, wherein the polarizing film includes a polarizer and a transparent protective film provided on only one side of the polarizer, the pressure-sensitive adhesive layer is provided on a side of the polarizer where the transparent protective film is absent, and the pressure-sensitive adhesive layer is made of a pressure-sensitive adhesive composition containing a (meth)acryl-based polymer (A) and an alkali metal salt (B). The pressure-sensitive adhesive layer-attached polarizing film has a pressure-sensitive adhesive layer with an antistatic function and satisfactory durability and whose optical properties are less likely to be degraded.

Abstract: A method for producing a long retardation film having an optical axis in an oblique direction relative to the length direction of the long retardation film is provided.

Abstract: Method for producing a phase difference plate includes step of forming a layered body including resin-layer (a) containing resin-A having a positive intrinsic birefringence, resin-layer (b) contains resin-B having a negative intrinsic birefringence and is provided on a surface of resin-layer (a), and resin-layer (c) contains resin-C having positive intrinsic birefringence and is provided on another surface opposite to the resin-layer (a) of resin-layer (b); a first step of stretching the layered body in one direction at temperature T1 and stretching ratio of 3 times or more; and a second stretching step of, after the first stretching step, stretching the layered body in another direction approximately orthogonal to the stretching direction at a temperature T2 that is lower than temperature T1 to obtain a phase difference plate, wherein resin-C contains polymer X having a positive intrinsic birefringence and cross-linked particles of polymer Y having a negative intrinsic birefringence.

Abstract: A display device includes a display unit for displaying an image, a first retarder provided on the display panel, a first polarizing plate provided on the first retarder, a touch unit provided on the first polarizing plate, a second retarder provided on the touch unit, and a second polarizing plate provided on the second retarder. With this arrangement, external light entering into the display may either be transmitted or reflected off of the touch unit, and in either case, be absorbed by the second polarizing plate without leaving the display device.