Abstract: A spatial light modulator and a holographic 3D display device are provided. The spatial light modulator includes a first liquid crystal panel configured to adjust a phase of first light; a second liquid crystal panel configured to adjust an amplitude of the first light, located on one side of the first liquid crystal panel; a quarter-wave plate located on a side of the second liquid crystal panel away from the first liquid crystal panel; and a polarizer located on a side of the quarter-wave plate away from the first liquid crystal panel. A difference between a refractive index of second liquid crystal molecules along a direction of the liquid crystal optical axis and a refractive index perpendicular to the direction of the liquid crystal optical axis is ?n, a thickness of the second liquid crystal layer is d, a wavelength of the first light is ?1, and 0.5?1??n×d?0.75?1.

Abstract: An image display device includes: a first display panel and a second display panel in which transmittance or reflectance of light is controlled on the basis of an image signal; and a light irradiation unit that irradiates the first display panel and the second display panel with light, wherein the first display panel and the second display panel are sequentially driven by image signals corresponding to a plurality of color light beams, and in a period in which one of the first display panel and the second display panel is driven by an image signal corresponding to any one of the plurality of color light beams, an image signal for driving the other display panel is switched.

Abstract: An optical device includes an electro-optical layer, having an effective local index of refraction at any given location within an active area of the electro-optical layer that is determined by a voltage waveform applied across the electro-optical layer at the location. Conductive electrodes extend over the first and second sides of the electro-optical layer. The conductive electrodes include an array of excitation electrodes including parallel stripes of a transparent conductive material having gaps between the stripes of a gap width that is less than the layer thickness of the electro-optical layer. Control circuitry is coupled to apply respective control voltage waveforms to the excitation electrodes and to modify the control voltage waveforms applied to each of the excitation electrodes concurrently and independently so as to generate a phase modulation profile in the electro-optical layer.

Abstract: The optical system introduces light from a display element displaying an image to an observer. The optical system includes in order from the display element toward the observer, a first phase plate, a semi-transmissive reflective surface, a lens, a second phase plate, and a polarization beam splitter configured to reflect a first linearly polarized light and transmit a second linearly polarized light whose polarization direction is orthogonal to that of the first linearly polarized light. The semi-transmissive reflective surface has a transmittance smaller than a reflectance thereof.

Abstract: An overlay measurement device for measuring an error between a first overlay mark and a second overlay mark respectively formed on different layers formed on a wafer is proposed. The device includes a light source, a first beam splitter configured to split a beam emitted from the light source into two beams, a first color filter configured to adjust a center wavelength and a band width of one of the beams split by the first beam splitter so that the center wavelength and the band width of one of the beams become suitable for acquiring an image of the first overlay mark.

Abstract: A projector includes a lens, a beam processing module, a plurality of digital micromirror devices, a reflecting module and an illumination module. The beam processing module is disposed with respect to the lens. The digital micromirror devices are disposed around the beam processing module, wherein a beam projecting path is defined between the lens and the digital micromirror device. The reflecting module is disposed with respect to the digital micromirror devices and located beyond the beam projecting path. The illumination module is disposed with respect to the reflecting module. An initial beam projected by the illumination module is reflected to the digital micromirror devices by the reflecting module, such that the digital micromirror devices generate a plurality of image beams. The beam processing module combines the image beams to form a projecting beam and projects the projecting beam onto the lens along the beam projecting path.

Abstract: An apparatus includes a light source unit that emits color light beams having different wavelengths; a light intensity modulation element including pixels, and subjecting the color light beams to intensity modulation to generate an image; a diffraction element configured to simultaneously illuminate at least two pixel regions at different pixel positions, with different color light beams, by diffracting the respective color light beams from the light source unit toward pixel regions at different pixel positions on the light intensity modulation element; and a control unit that changes diffraction angles of the respective color light beams in the diffraction element within a predetermined period. The control unit also sequentially switches illumination regions for the pixel regions by the respective color light beams, to allow all of the color light beams to time-divisionally illuminate any pixel region of the pixel regions within the predetermined period.

Abstract: A system is provided. The system includes a display configured to output a virtual image. The system also includes a lens assembly optically coupled to the display and including a plurality of optical lenses. The system also includes a controller configured to selectively activate one or more of the plurality of optical lenses, determine a lens center shift between a center of the selectively activated one or more of the plurality of optical lenses and a center of the lens assembly, and determine an image shift based on the lens center shift for shifting the virtual image output from the display.

Abstract: There is provided a projection system that includes a light source, a display panel, a projection optical system, and a controller. The light source outputs light of a plurality of colors. The display panel includes a light modulation element provided for each pixel, and modulates the light outputted from the light source. The projection optical system projects light having passed through the display panel, and the controller controls light output of each color of the light source in a time-axis direction. This configuration is adopted to achieve an improvement in brightness of a projected image/a screen and prevention of color mixing in field sequential driving.

Abstract: A display device includes a plurality of light emitting units and a light adjusting layer disposed on the light emitting units. The light adjusting layer includes at least one light adjusting structure, and one light adjusting structure is corresponding to at least three of the light emitting units. The display device provides a sum of viewing-angles of a first number of the light emitting units when the first number of the light emitting units is turned on, and the display device provides a sum of viewing-angles of a second number of the light emitting units when the second number of the light emitting units is turned on. The first number is less than the second number, and the sum of viewing-angles of the first number of the light emitting units is less than the sum of viewing-angles of the second number of the light emitting units.

Abstract: An optical device includes a first polarization selective reflector positioned in a first orientation so that the first polarization selective reflector: receives first light in a first direction; redirects a first portion, of the first light, having a first polarization to a second direction that is non-parallel to the first direction; and receives second light in a third direction and transmit a first portion, of the second light. A second polarization selective reflector positioned in a second orientation non-parallel to the first orientation, and adjacent to the first polarization selective reflector so that the second polarization selective reflector: receives third light in a fourth direction; redirects a first portion, of the third light, having the first polarization to a fifth direction that is non-parallel to the fourth direction; and receives fourth light in a sixth direction and transmit a first portion, of the fourth light having the second polarization.

Abstract: An optical film suppresses at any azimuthal angle where the optical film is combined with a polarizer and applied as a circularly polarizing plate to a display device; a circularly polarizing plate; and a display device. The optical film includes a first, a second, and a third optically anisotropic layer in this order, in which the first layer is formed by fixing a vertically aligned disk-like liquid crystal compound or formed by fixing a horizontally aligned rod-like liquid crystal compound, the second layer is formed by fixing a rod-like liquid crystal compound twist-aligned along a helical axis extending in a thickness direction, the third layer is formed by fixing a vertically aligned rod-like liquid crystal compound, and at least one of the first, second, or third layers is formed of a liquid crystal compound containing a reverse wavelength dispersion liquid crystal compound.

Abstract: An excitation light intensity control system, including a lighting part, an imaging part and a control part. The lighting part includes a light source; the imaging part includes a light modulator and a color conversion element; the excitation light emitted from the light source is imported to the light modulator for modulation; the modulated excitation light excites the color conversion element to produce multicolor excited light; the lighting part further includes a light recycling system used for recoupling part of the excitation light emitted from the light modulator to be incident to the light modulator; the control part includes a controller used for receiving original image data and controlling the intensity of the excitation light emitted from the light modulator and/or the light source.

Abstract: A five-degree-of-freedom heterodyne grating interferometry system, comprising a single frequency laser device (1) and an acousto-optic modulator (2); the single frequency laser device (1) emits a single frequency laser, and the single frequency laser is coupled by optical fiber and, after being split, enters the acousto-optic modulator (2) to obtain two linearly polarized lights of different frequencies, one being a reference light, and one being a measurement light; an interferometer lens group (3) and a measurement grating (4), used for forming the reference light and the measurement light into a measurement interference signal and a compensation interference signal; and multiple optical fiber bundles (5), respectively receiving the measurement interference signal and the compensation interference signal, each optical fiber bundle (5) having multiple multimode optical fibers respectively receiving signals at different positions on the same plane.

Abstract: A liquid crystal projector includes a red liquid crystal panel, a green liquid crystal panel, a blue liquid crystal panel, a green liquid crystal panel, an optical shift element configured to shift an emission optical path of a synthesized image of each liquid crystal panel, and a control circuit configured to control these. The control circuit controls the optical shift element to set a projection position to a projection position (A) in a subframe f1 and to a projection position (B) in a subframe f2. The control circuit causes a resolution of the liquid crystal panel expressed in the subframes f1 and f2 to be lower than the resolution of the liquid crystal panel expressed in the subframes f1 and f2.

Abstract: A display device includes a substrate, at least three light emitting elements and a light adjusting layer. The light adjusting layer includes at least one light adjusting structure and is disposed on the light emitting elements. One light adjusting structure is corresponding to the light emitting elements. The display device provides a sum of viewing-angles of a first number of the light emitting elements when the first number of the light emitting elements is turned on, and the display device provides a sum of viewing-angles of a second number of the light emitting elements when the second number of the light emitting elements is turned on. The first number is less than the second number, and the sum of viewing-angles of the first number of the light emitting elements is less than the sum of viewing-angles of the second number of the light emitting elements.

Abstract: An electronic device includes a first duct for guiding the air blown out from blowers for cooling a liquid crystal panel mounted on an illumination optical system to the liquid crystal panel, a second duct for guiding the air passing through the liquid crystal panel in the opposite direction of the air blown out from the blowers, a heat sink for removing heat from the air passing through the second duct and a blower holding unit for holding the blowers are provided in a dust-proof case, and the top surface of the blower holding unit, the blower holding unit forms a third duct for guiding the air from which heat has been removed by the heat sink to the air inlet of the blowers that is a space formed along the top surface of the dust-proof case.

Abstract: A projection type display apparatus which includes an optical system having an adjuster configured to adjust a field curvature of an in-focus plane of a projection image includes at least one processor or circuit configured to execute a plurality of tasks including an acquisition task configured to acquire position information of a predetermined position in an imaging area of an image generator and an optical axis of the optical system, and a control task configured to acquire an adjusting amount of a tilt unit configured to tilt the in-focus plane, using information from the acquisition task, a field curvature amount of the in-focus plane based on a position of the adjuster, and information on a projection target.

Abstract: A compound eye illumination system for an LCD projector includes: an LED light source, an LED collector, a fly-eye lens, an overlapping lens, a focusing lens, an LCD light valve, a field lens, and a projection lens, which are arranged in sequence according to a light travelling direction. The compound eye illumination system further includes: a quarter wave plate and a brightness-enhancing polarizer, which are sequentially arranged between the LED collector and the fly-eye lens according to the light travelling direction. According to the present invention, a polarized light passes through the quarter wave plate twice to complete polarization conversion. As a result, lighting efficiency of the projector is significantly improved and power consumption is saved, which greatly improves the product competitiveness. Moreover, the overall structure is simple, the volume is relatively small, the production is easy, and the price is low.

Abstract: An LCD projector optical system includes: an LED light source, a transflective plate, a condensing device, a first focusing lens, a polarization modulation plate, a brightness-increasing polarizing plate, an LCD light valve, a field lens, a reflector, and a projection lens, which are all arranged sequentially along a light travel direction; wherein the transflective plate has a light-transmitting portion and a reflecting portion. Light from the LED light source enters the condensing device from the light-transmitting portion, and then transmitted light and reflected light in illumination light are separated by the brightness-increasing polarizing plate.

Abstract: A vision system for a vehicle includes a forward-viewing camera located behind and viewing through a vehicle windshield, a rearward-viewing camera located at a rear of the vehicle, and a common image processor operable for processing captured image data. A video display screen is located within the interior cabin of the vehicle viewable by a driver of the vehicle. The common image processor utilizes object detection software at least during processing of first image data captured by the forward-viewing camera to detect at least one vehicle present exterior the equipped vehicle. Responsive to the vehicle being shifted into a reverse gear and while the driver is executing a reversing maneuver, video images derived from image data captured by at least the rearward-viewing camera are displayed on the video display screen.

Abstract: A projector and a method for projecting an image light beam according to an image signal are provided. The method includes: receiving the image signal; decoding the image signal to obtain a metadata of the image signal; determining whether the image signal is a HLG-HDR signal according to the metadata; converting a color space of the image signal from a wider color gamut to a narrower color gamut in response to the image signal is the HLG-HDR signal so as to generate a converted image signal; performing a gamma correction on the converted image signal according to the metadata to generate a corrected image signal; transferring the corrected image signal into an optical signal; providing a light beam; respectively modulating the light beam and a illumination beam according to the optical signal to form an image light beam; and projecting the image light beam.

Abstract: A projector and a method for projecting an image light beam according to an image signal are provided. The method includes: receiving the image signal; decoding the image signal to obtain a metadata of the image signal; converting a color space of the image signal from a wider color gamut to a narrower color gamut according to the metadata so as to generate a converted image signal; performing a gamma correction on the converted image signal according to the metadata to generate a corrected image signal; transferring the corrected image signal into an optical signal; providing a light beam; respectively modulating the light beam and a illumination beam according to the optical signal to form an image light beam; and projecting the image light beam.

Abstract: In described examples, a method includes: receiving an array of image data pixels for display by a spatial light modulator; dividing the array of image data pixels into a plurality of blocks. For the blocks of the plurality of blocks, the method includes: computing a mean value for pixels in the block; computing a variance for pixels in the block; and, in response to the mean value and the variance, retrieving an indicator of a likelihood of a visible artifact for the block; and in response to the retrieved indicator, outputting a signal to selectively increase or reduce a load time of the spatial light modulator for displaying the array of image data pixels.

Abstract: Projector including a light source device, an image forming device, and a cooling device, image forming device includes a light modulation device having a liquid crystal panel, incident side polarization plate and attachment member, a liquid crystal panel includes a panel main body having a modulation area having a rectangular shape, and a frame, cooling device includes a first circulation device that makes a liquid refrigerant flow through a first flow channel included in frame along one of long sides and short sides in modulation area, the incident side polarization plate has a polarization plate main body and a light transmissive substrate, attachment member includes clamp-holding members adapted to clamp-hold the incident side polarization plate, and a support member, clamp-holding members are disposed at positions corresponding respectively to the long sides, and the support member is connected to the areas respectively along the short sides on the frame surface.

Abstract: The wafer-level method for applying N?2 first elements to a first side of a substrate, wherein the substrate has at the first side a first surface including the steps of providing the substrate, wherein at least N barrier members are present at the first side, and wherein each barrier member is associated with one of the first elements. For each of the first elements, the method includes bringing a first amount of a hardenable material in a flowable state in contact with the first surface, the first amount of hardenable material being associated with the first element; controlling a flow of the first amount of hardenable material on the first surface with the associated barrier member; and hardening the first amount of hardenable material to interconnect the first surface and the respective element.

Abstract: A head-mounted display including a transparent display, a main liquid crystal lens and a first liquid crystal lens is provided. The transparent display is configured to emit an image light beam. The main liquid crystal lens is disposed near the transparent display. The transparent display is disposed between the main liquid crystal lens and the first liquid crystal lens. The first liquid crystal lens is configured to receive an ambient light beam. The head-mounted display allows at least a part of the image light beam emitted from the transparent display passing through a pupil by phase modulating of at least a part of the main liquid crystal lens.

Abstract: A projector includes a light source, a light modulation device configured to modulate a light output from the light source, a projection optical device configured to project the light modulated by the light modulation device, a casing containing at least a part of the light modulation device and having an interior filled with a cooling liquid, a circulating device configured to circulate the cooling liquid at least to a light exiting side of a modulation part in the light modulation device, and a control device configured to control an operation of the circulating device. The control device changes an operation level of the circulating device.

Abstract: A microlens array includes N lenses ranging from a 1st lens to an Nth lens and a lens arrangement area. N is a positive integer. The lens arrangement area has the N lenses arranged in array. The lens arrangement area receives light emitted from a light source. An ith (i being 1st to Nth) lens satisfies a conditional expression below: ?20°???20° where ? denotes an angle formed by a main-axis orientation of double refraction and a reference orientation.

Abstract: A display device includes a liquid crystal display element, a light shielding member, and a heat sink. The liquid crystal display element has a display pixel region. The light shielding member shields regions other than the display pixel region. The liquid crystal display element and the light shielding member are fixed to the heat sink. The light shielding member includes a frame part, an inclined part, and an opening. The frame part is disposed outside the display pixel region. The inclined part is inclined from the frame part toward an outer peripheral portion of the display pixel region. The opening is formed by an end portion of the inclined part on a side of the display pixel region, and formed in a shape corresponding to the display pixel region.

Abstract: A head-mounted display including a transparent display, a liquid crystal lens and a first Fresnel lens is provided. The transparent display is configured to emit an image light beam. The liquid crystal lens is disposed near the transparent display. The transparent display is disposed between the liquid crystal lens and the first Fresnel lens. The first Fresnel lens is configured to receive an ambient light beam. The head-mounted display allows at least a part of the image light beam emitted from the transparent display passing through a pupil by phase modulating of at least a part of the liquid crystal lens.

Abstract: An ophthalmic lens incorporating an array of microlenses.

Abstract: A scanning projector and a method for operating a scanning projector including a light source module including a plurality of color light sources including at least one color light source provided in a plurality, and a scanner configured to execute scanning in the horizontal direction and the vertical direction using light beams emitted from the light source module. Light beams emitted from the plurality of same color light sources are projected on different positions on a screen within one frame and, thus, more rapid and effective scanning may be executed and a high-quality image may be formed.

Abstract: The depth of one or more objects within a scene may be determined utilizing system that includes a single light source, a reflector (e.g., an ellipsoidal reflector), a shutter mechanism associated with the light source, and a camera. More particularly, the light source may output light that is directed towards the scene (a first set of light beams) and towards the reflector (a second set of light beams) utilizing the shutter mechanism. The reflector may reflect the second set of light beams towards the scene. The camera may then capture a first image that corresponds to the first set of light beams and a second image that corresponds to the second set of light beams. The depth of a particular one of the objects within the scene may be determined based at least in part on the first image and the second image.

Abstract: Provided are an optical element and an optical device using the optical element to which a manufacturing process for manufacturing a wire-grid structure can be basically applied, and besides, in which a higher polarization contrast ratio than that of a wire-grid element can be obtained. A wobbled wire element in an embodiment has a feature that a periodic structure having a period equal to or larger than a wavelength of an incident light wave is formed in a y direction. In this manner, in a wobbled wire element in a first embodiment, a polarization contrast ratio can be significantly improved.

Abstract: In described examples, a method includes: receiving an array of image data pixels for display by a spatial light modulator; dividing the array of image data pixels into a plurality of blocks. For the blocks of the plurality of blocks, the method includes: computing a mean value for pixels in the block; computing a variance for pixels in the block; and, in response to the mean value and the variance, retrieving an indicator of a likelihood of a visible artifact for the block; and in response to the retrieved indicator, outputting a signal to selectively increase or reduce a load time of the spatial light modulator for displaying the array of image data pixels.

Abstract: The disclosure generally relates to beamsplitters useful in color combiners, and in particular color combiners useful in small size format projectors such as pocket projectors. The disclosed beamsplitters and color combiners include a tilted dichroic reflective polarizer plate having at least two dichroic reflective polarizers tilted at different angles relative to incident light beams, with light collection optics to combine at least two colors of light.

Abstract: A touching display panel and a display device using the same are provided. The touching display panel includes a liquid crystal layer, a first substrate having a hard surface structure, a second substrate, a touch sensor layer, a thin-film transistor layer, and a color filter layer. The first and second substrates are respectively disposed at two sides of the liquid crystal layer. The touch sensor layer is disposed between the first substrate and the liquid crystal layer, and is formed on the first substrate. The thin-film transistor layer and the color filter layer are both disposed between the first substrate and the second substrate. At least one of the thin-film transistor layer and the color filter layer is formed on the first substrate.

Abstract: Mapping apparatus includes a transmitter, which emits a beam comprising pulses of light, and a scanner, which is configured to scan the beam, within a predefined scan range, over a scene. A receiver receives the light reflected from the scene and to generate an output indicative of a time of flight of the pulses to and from points in the scene. A processor is coupled to control the scanner so as to cause the beam to scan over a selected window within the scan range and to process the output of the receiver so as to generate a 3D map of a part of the scene that is within the selected window.

Abstract: A method can include determining characteristics of a surface; determining a point of view for an object with respect to the surface; and projecting an adjusted image onto the surface, the adjusted image being adjusted based at least in part on the characteristics of the surface and the point of view for the object with respect to the surface. Various other methods, apparatuses, systems, etc., are also disclosed.

Abstract: The present invention provides a counter electrode (13) and an alignment controlling electrode opening (14) directly on a color filter colored layer (12) to produce a liquid crystal display device (1) of a vertical alignment (VA) display mode. The present invention includes no overcoat layer for the color filter colored layer (12), and adjusts the thickness, pigment concentrations and the like for the color filter colored layer (12) to achieve a wide color reproduction range and high alignment stability.

Abstract: A display panel and a display unit are provided that allow a high-contrast and a bright image to be obtained. A display panel is composed of a light modulation device. The light modulation device includes: an electrode capable of generating a main electric field in a direction parallel to a plane intersecting with a normal line of a transparent substrate; and a light modulation layer including a bulk and a particulate each having an optical anisotropy. Optical axes AX1 and AX2 of the bulk and the particulate are parallel or substantially parallel to a top surface of the transparent substrate, and may be faced in different directions from each other and may be faced in same or substantially same directions with each other within the plane parallel or substantially parallel to the top surface of the transparent substrate depending on a magnitude of the electric field generated by the electrode.

Abstract: An embodiment of the present disclosure provides an array substrate, and the array substrate including: at least a data line and at least a gate line; and a plurality of pixel units defined by the data line and the gate line. Each of the plurality of pixel units includes a thin film transistor, a first electrode and a second electrode, and the first electrode and the second electrode overlap each other and are insulated from each other and the second electrode is positioned above the first electrode. An alignment film is formed on a surface of the array substrate, a direction of the second electrode and one side of the array substrate form a predetermined angle and a rubbing direction of the alignment film is parallel to the one side of the array substrate.

Abstract: A method for producing a polarizing element includes: forming particulate materials containing a metal halide on a glass substrate; forming a protective film that covers the particulate materials in a plasma environment while reducing the metal halide constituting the particulate materials; and stretching the particulate materials by stretching the glass substrate and the protective film at a temperature at which the glass substrate is softened.

Abstract: Provided is a method of driving a display panel, including: outputting first data voltages representing a left-eye image or a right-eye image to first signal lines among a plurality of signal lines of the display panel during a first period of a frame for rendering the left-eye or right-eye image of a three-dimensional (3D) image; outputting second data voltages representing the left-eye image or right-eye image for second signals among the plurality of signal lines of the display panel during a second period of the frame for rendering the left-eye or right-eye image of the 3D image; and stopping the data voltages from being outputted to the display panel during a third period of the frame.

Abstract: In one embodiment, a liquid crystal display device includes a first substrate and a second substrate. The first substrate includes a first gate line and a second gate line extending in a first direction, respectively. A first source line and a second source line extend in a second direction orthogonally crossing the first direction. A pixel electrode includes a first main pixel electrode in the shape of a belt located on an edge of the first source line and extending in the second direction, and a second main pixel electrode in the shape of a belt located on an edge of the second source line and extending in the second direction. A second substrate includes a main common electrode located between the first main pixel electrode and the second main pixel electrode and extending in the second direction.

Abstract: The purpose of the present invention is to provide a projection image display device in which all of the multiple light sources to be used are positioned optimally, regardless of the mode of installation of the device. This projection image display device has two illumination optical systems (1, 2) that are each provided with a light source (111, 211), a color separator for separating into three colors of light, a liquid crystal panel (150, 250) for forming an optical image, and a color synthesis prism (160, 260) for color-synthesizing. A polarization beam splitter (3) for synthesis synthesizes an optical image formed by the illumination optical system (1, 2), and projects the same from a projection lens (4). The optical axis (101, 201) of each light source (111, 211) is positioned within the same plane as the optical axis (401) of the projection lens (4), and so as to orthogonally intersect the optical axis (401) of the projection lens.

Abstract: Since a relay optical system includes double gauss lenses and pairs of meniscus lenses disposed so as to be convex toward the double gauss lenses, it is possible to sufficiently minimize the occurrence of aberration from dimming light valves to color modulation light valves, to maintain an image formation state with high performance, and further to form a favorable image.

Abstract: A polarization separation device includes a transmissive substrate formed of crystalline material having a birefringent property and an optical rotatory property, and a polarization separation portion that is provided on an incidence-side surface of the transmissive substrate and transmits P-polarized light and reflects S-polarized light. A reflective element, which reflects the S-polarized light reflected by the polarization separation portion, is disposed substantially in parallel with the transmissive substrate. A phase difference plate is disposed at an emission-side of the transmissive substrate.

Abstract: A projection display device includes a first display panel (23a), a second display panel (23b), a PBS (Polarization Beam Splitter) (22) with a first surface (22a) and a second surface (22b) opposite each other, a light recycling device (25a, 25b and 23b), and a projection lens (24). The PBS (22) transmits a first type parallel polarized light and reflects a second type parallel polarized light. The light recycling device (25a, 25b and 23b) transforms the first type parallel polarized light transmitted by the PBS (22) into the second type parallel polarized light which carries a second image information, then reversely transmits the second type parallel polarized light to the second surface (22b) of the PBS (22). The projection display device improves the light utilization efficiency and can be used for 3D display.