Abstract: A zoom lens suitable for imaging an object on a photosensitive element is provided. The zoom lens includes a first lens group, a second lens group disposed between the first lens group and the photosensitive element, a third lens group disposed between the second lens group and the photosensitive element, and a fourth lens group. The second lens group is suitable for moving between the first lens group and the third lens group. The third lens group includes two lenses having positive refractive power. The fourth lens group is disposed and suitable for moving between the third lens group and the photosensitive element. The refractive powers of the first lens group, the second lens group, the third lens group, and the fourth lens group are a positive value, a negative value, a positive value, and a positive value respectively.

Abstract: A brightness enhancement film having a light exit surface and multiple stripe prisms disposed opposite to the light exit surface is provided. The stripe prisms are parallel, each stripe prism has a light incident curved surface, a light reflective inclined surface and a flat surface, and the light incident curved surface is connected between the light reflective inclined surface and the flat surface. The light incident curved surface and the flat surface are opposite to the light reflective inclined surface. The light incident curved surface is an outward curved surface. Further, a light beam from the light incident curved surface is reflected to the light exit surface by the light reflective surface.

Abstract: A zoom lens for imaging an image onto a photosensitive element includes a first lens group, a second lens group, a third lens group and a fourth lens group. The second lens group is located and suitable for moving between the first lens group and the third lens group; the fourth lens group is located and suitable for moving between the third lens group and the photosensitive element. The first lens group, the second lens group, the third lens group, and the fourth lens group have a positive refractive power, a negative refractive power, a positive refractive power and a positive refractive power, respectively. Besides, the third lens group includes at least a hybrid lens and the second lens group includes at least an aspheric lens, the number of the aspheric lens is smaller than or equal to 2. Thus, manufacturing cost of the zoom lens mentioned above is lower.

Abstract: A brightness enhancement film, which is disposed beyond a light module, the light source module emits light upward to and through the brightness enhancement film. The brightness enhancement film is composed of a substrate and a diffractive optical element which is disposed on a surface of the substrate, the diffractive optical element collimates a direction of the light after the light is passing through the diffractive optical element.

Abstract: An optical system with an optical axis is provided. The optical system includes at least a lens group and a light deflection element. The lens group includes a plurality of lenses lined along the optical axis. The light deflection element is disposed along the optical axis and located inside or outside the lens group. The light deflection element comprises two substrates and a liquid crystal layer between the substrates. Two electrode layers are respectively disposed on surfaces of the substrates that contact the liquid crystal layer. An electric field is applied to the liquid crystal layer through the electrode layers to vary the refractive index of the liquid crystal layer. An included angle exists between the substrates.

Abstract: A light source module includes a light source, a paraboloid reflector and an aspheric lens. The light source is used for generating a first light. The paraboloid reflector is used for reflecting the first light beam to form a second light. The aspheric lens is used for converging the second light. The aspheric lens includes an aspheric incident surface and an emergent surface. The aspheric incident surface is used for converging the second light beam into a third light, and the emergent surface is used for converging the third light. The emergent surface includes two aspheric curved surfaces configured symmetric to an optical axis of the aspheric lens.

Abstract: A lamp module comprises a light source, a main reflector and an elliptical sub-reflector. The light source has a first arc and a second arc. The distance between the first arc and the second arc is an initial arc gap, and the light source is used for generating a light beam. The main reflector is used for reflecting the light beam and has a central axis, and the light source is disposed on the central axis. The elliptical sub-reflector is used for reflecting the light beam to the main reflector. The elliptical sub-reflector has a first focus and a second focus, a center of the light source is positioned on a long axis of the elliptical sub-reflector and between the first focus and the second focus, and a distance between the first focus and the second focus is larger than the initial arc gap.

Abstract: An optical projection device and polarizing light source module are provided. The polarizing light source module includes a light source, a reflector and an optical sheet with a polarization splitting portion and a polarization conversion reflection portion. The light source provides an un-polarized light. The reflector with a reflection curved surface covers the light source with the optical sheet. A first polarized light passes through the polarization splitting portion and a second polarized light is reflected by that and passes to the reflection curved surface, then the second polarized light is reflected by the reflection curved and passes to the polarization conversion reflection portion. The second polarized light is converted to the first polarized light by the polarization conversion reflection portion, and the first polarized light reflected by the polarization conversion reflection portion is reflected by the reflection curved surface and penetrates through the polarization splitting portion.

Abstract: A zoom lens having a high zoom ratio and also a small size is proposed. The zoom lens has a front group of lenses and a rear group of lenses. The front group of lenses has a first lens, a second lens, and a third lens. The first lens is a meniscus negative lens. The second lens is a biconcave lens negative lens. The third lens is a positive lens. The rear group of lenses has a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The fourth lens is a positive lens. The fifth lens is a biconvex lens. The sixth lens is a meniscus negative lens. The seventh lens is a meniscus negative lens. The fourth and seventh lenses are aspheric lenses made of plastic material. The proposed zoom lens can meet the requirement of miniaturized size and also maintain the image quality.

Abstract: An illuminating module is adapted for use in a display apparatus, and includes a spherical first reflector segment having a first reflecting surface and a first focal point. A parabolic second reflector segments has a second reflecting surface facing the first reflecting surface in a first direction, and a second focal point that is coincident with the first focal point. A light source is coincident with the first and second focal points. Light rays that radiate toward the second reflecting surface are reflected thereby to travel in a second direction transverse to the first direction. Light rays that radiate toward the first reflecting surface are reflected thereby back to the light source. A third reflector segment has a third reflecting surface facing the second reflecting surface in the second direction to reflect the light rays received thereby to travel in a third direction transverse to the second direction.

Abstract: An illuminating module includes a first reflector having a curved first reflector surface, a reflector opening and a first focal point, and a light source disposed in the first reflector at the first focal point. A second reflector is mounted on a surrounding edge of the first reflector to configure the opening with shielded and unshielded portions, and has a second reflector surface facing the first reflector surface. A portion of the light rays from the light source which radiates toward the first reflector and which is reflected thereby toward the shielded portion is reflected by the second reflector surface back to the light source so as to be able to combine with the light rays that are reflected by the first reflector for passage through the unshielded portion.

Abstract: In a projection display that includes a polarization beam splitter prism and two reflective light valves, each of a pair of dichroic beam splitters is disposed between the polarization beam splitter prism and a respective one of the reflective light valves. The arrangement as such ensures that only a minimal amount of light leakage components will reach a projection lens of the projection display so as to achieve optimum image quality.

Abstract: An illuminating module includes two spaced-apart light sources, two hemispherical reflectors, two parabolic reflectors and two planar reflectors. Each of the light sources is disposed at a common focal point of one of the hemispherical reflectors and one of the parabolic reflectors. Each of the parabolic reflectors faces a respective one of the hemispherical reflectors in one direction, and confronts a respective one of the planar reflectors in the other direction such that light rays from each of the light sources which radiate toward the respective hemispherical reflector and the respective parabolic reflector are directed to the respective planar reflector so as to be subsequently reflected to travel in parallel lines parallel to an optical axis.

Abstract: An illuminating apparatus includes a plurality of light sources that generate a plurality of primary color light components, a reflector unit for receiving the primary color light components from the light sources, and an integrator having an input side to receive the primary color light components reflected by the reflector unit.

Abstract: An illuminating module includes a first reflector having a curved first reflector surface, a reflector opening and a first focal point, and a light source disposed in the first reflector at the first focal point. A second reflector is mounted on a surrounding edge of the first reflector to configure the opening with shielded and unshielded portions, and has a second reflector surface facing the first reflector surface. A portion of the light rays from the light source which radiates toward the first reflector and which is reflected thereby toward the shielded portion is reflected by the second reflector surface back to the light source so as to be able to combine with the light rays that are reflected by the first reflector for passage through the unshielded portion.

Abstract: In an illuminating apparatus for a projection display, light from a plurality of light sources converge at a respective focal point that coincides with an input side of a corresponding light pipe integrator. The light pipe integrators convert the light incident on the input sides thereof into evenly distributed light that are radiated at output sides thereof and that pass through a principal condenser lens before reaching a plane of a liquid crystal display panel of the projection display.

Abstract: An illuminating apparatus is adapted to supply input light to a light-processing unit of a projection display, and includes a lighting unit, a lens unit and a light integrator. The lighting unit includes a plurality of lamp bases, each of which is operable so as to generate forwardly directed light rays. The lens unit is adapted to be disposed between the lighting unit and the light-processing unit so as to receive the forwardly directed light rays from the lamp bases. The light integrator has an input side facing the lens unit so as to receive the light rays that pass through the lens unit, and an output side adapted to face the light-processing unit. The light rays that are received from the lens unit are radiated by the light integrator as an evenly distributed light source at the output side for reception by the light-processing unit.

Abstract: A projection display includes a transmissive first light valve and a reflective second light valve that are disposed adjacent to a polarization beam splitter prism and that are used to modulate first, second and third color components. The modulated first, second and third color components are then obtained from one side of the polarization beam splitter prism.

Abstract: In a projection display that includes a polarization beam splitter prism and two reflective light valves, each of a pair of dichroic beam splitters is disposed between the polarization beam splitter prism and a respective one of the reflective light valves. The arrangement as such ensures that only a minimal amount of light leakage components will reach a projection lens of the projection display so as to achieve optimum image quality.

Abstract: A display apparatus includes a light source, a light integrator, a positive lens unit, and a liquid crystal display panel that are arranged in sequence and that are aligned along an optical axis. Light from the light integrator passes through the positive lens unit before reaching the display panel. The positive lens unit includes at least first and second lens components, each of which is formed from at least one lens member. The first lens component is movable relative to the light integrator along the optical axis, and the second lens component is movable relative to the first lens component along the optical axis for forming an image with a desired focusing, brightness and magnification factor on the display panel.