An optical film includes a substrate layer and a plurality of optical layers stacked on the substrate layer. The at least two optical layers have microstructures that complement to each other. The optical layer close to the substrate layer is the first optical layer, and the optical far from the substrate layer is the second optical layer. The refractive index of the first optical layer is smaller than the second optical layer, and the microstructure of the second optical layer has an acute angle. Because of the arrangement of the optical layers, the contrast of light intensity can be reduced, and the uniformity can be improved. The invention also provides a backlight module and a display device including the optical film.

A laser despeckle device includes a light source, a despeckle element, and a plurality of optical transmission modules. The light source is configured to emit a laser light. The despeckle element is disposed along the optical axis of the laser light. The optical transmission modules alternatively disposed at two opposite sides of the despeckle element.

A polarizing plate and an optical display apparatus including the same are provided. A polarizing plate includes: a polarizer; and a first optically functional layer and a first protective layer sequentially stacked on a surface of the polarizer, and the optically functional layer includes a resin layer and acicular microparticles, the resin layer having a glass transition temperature (Tg) of −70° C. to −15° C. and a storage modulus of 1×10.sup.−3 MPa to 9×10.sup.−1 MPa at 25° C., and the acicular microparticles being oriented in an in-plane direction of the first optically functional layer, and, when a light absorption axis of the polarizer is 0°, orientation angles of longitudinal directions of the acicular microparticles with respect to the light absorption axis of the polarizer have an average value of −10° to +10° and a standard deviation of 15° or less.

A solar cell device includes a light-transmissive substrate, a solar cell module, an optical composite film assembly, and a light-transmissive top plate. The solar cell module is disposed on the light-transmissive substrate and includes a solar cell unit. The optical composite film assembly is light-transmissive, and includes a light diffusion layer and a fiber layer. The optical composite film assembly and the solar cell module are disposed on each other. The light-transmissive top plate is disposed spaced apart from the light-transmissive substrate and cooperates with the light-transmissive substrate to sandwich the solar cell module and the optical composite film assembly.

An optical system including a lighting component and a switchable diffuser in optical communication with the lighting component. The optical system may further include a low absorbing optical component. At least one outer surface of the switchable diffuser and/or the low absorbing optical component includes light redirecting structures. When the switchable diffuser is in a first state and the optical system produces a light output, the light redirecting structures are configured to increase the full width at half-maximum (FWHM) of the light output of the optical system in at least one direction by at least 5 degrees relative to that of an otherwise equivalent optical system that does not include the light redirecting structures.

A lens diffusing light emitted from a light source includes a concave light-incident surface, a light guide portion, and a light-emitting surface. The light-incident surface includes a plane portion opposed to the light source and an optical function portion that is formed on the plane portion and one of scatters and diffuses the light. The light emitted from the light source enters the light-incident surface. The light that has entered the light-incident surface passes through the light guide portion. The light-emitting surface emits the light passed through the light guide portion.

The present invention provides a rear projection simulator system with a free-form fold mirror. The system includes a high definition projector and a curved screen. The free-form fold mirror is interposed between the projector and the screen. The free-form fold mirror includes one or more non-planar (e.g., curved) portions to eliminate or reduce loss of resolution of the projected image near the edges or boundaries of the image.

Disclosed is a blue to white light conversion device, comprising: a light conversion subassembly comprising at least one light conversion layer, sandwiched between two light transmitting members, wherein the light conversion layer comprises a light conversion material comprising phosphors and/or quantum dots; at least one light diffusing subassembly neighboring the light conversion subassembly; and a top frame and a bottom frame surrounding the light diffusing subassembly and light conversion subassembly, respectively.

A touch sensing apparatus is disclosed comprising a panel that defines a touch surface, a plurality of emitters and detectors arranged along a perimeter of the light transmissive panel, and a light directing arrangement arranged adjacent the perimeter. The emitters are arranged to emit a respective beam of emitted light and the light directing arrangement is arranged to direct the light along a light path from the emitters to the touch surface. A diffusive light scattering element is arranged in the light path.

A light projection lens includes: an inner surface which light emitted from a light source enters, and includes a first concave portion; and an outer surface from which the light exits. In a cross section parallel to an optical axis of the light emitted from the light source, the outer surface and the first concave portion have a difference in radius of curvature in at least a portion of the outer surface and the first concave portion. In a cross section perpendicular to the optical axis of the light emitted from the light source, the first concave portion has an elliptical shape. The light which exits from the outer surface is lesser in amount in an optical axis direction of the light emitted from the light source than in a direction different from the optical axis direction.