Abstract: A back-light source comprises a plurality of light-emitting devices, each light-emitting device having a light-emitting package and a lens surface. In at least some of the light emitting devices, the radius of curvature in one direction of the lens surface is different from the radius of curvature in another direction such that one of the radii of curvature of the lens is greater than the other radius of curvature. In particular, one radius of curvature is equal to or smaller than half the length of the device. The other radius of curvature is equal to or greater than half the length of the device. As such, the lens has different focal lengths in different directions. The light-emitting package can have a plurality of light-emitting sources of a single color or of different colors.

Abstract: A light-emitting unit includes a bounding frame, a first light-emitting element, a second light-emitting element, and a first reflecting sheet. The first light-emitting element and the second light-emitting element are disposed in the bounding frame, and emit light in different directions. The first reflecting sheet is disposed on the bounding frame, and has a reflecting surface on one side away from the bounding frame.

Abstract: A light emitting diode module is disclosed. The light emitting diode module includes a substrate, a plurality of light emitting diodes, and a plurality of lenses. The light emitting diodes are disposed on the substrate, and the lenses are disposed on the substrate and covering the light emitting diodes, in which each of the lenses includes a curved surface corresponding to each of the light emitting diodes.

Abstract: A polarization conversion system suited for LCD or LCoS-based projection applications is disclosed. The present invention polarization conversion system encompasses a light pipe with a rectangular light tunnel therein defined by four side reflection mirrors. A front reflection with an aperture thereon is mounted on an entrance face of the light pipe. A first polarization beam splitter is mounted on an exit face of the light pipe. A retardation plate, which is perpendicular to the exit face, is situated atop the first polarization beam splitter. A reflection mirror is situated atop the retardation plate. A second polarization beam splitter is mounted under the first polarization beam splitter and is opposite to the retardation plate.

Abstract: A polarization conversion system suited for LCD or LCoS-based projection applications is disclosed. The present invention polarization conversion system encompasses a light pipe with a rectangular light tunnel therein defined by four side reflection mirrors. A front reflection with an aperture thereon is mounted on an entrance face of the light pipe. A first polarization beam splitter is mounted on an exit face of the light pipe. A retardation plate, which is perpendicular to the exit face, is situated atop the first polarization beam splitter. A reflection mirror is situated atop the retardation plate. A second polarization beam splitter is mounted under the first polarization beam splitter and is opposite to the retardation plate.

Abstract: An optical system utilizing a unique polarizer separating plate to replace conventional PBS prism is disclosed. The optical system of this invention, which may be applied to projection display apparatuses such as rear projection type televisions, includes an illumination system for generating a homogeneous light beam, a polarizer separating plate comprising a polarization separation surface that splits the light beam into a first polarized light beam with a first polarization status and a second polarized light beam with a second polarization status, wherein the first polarized light beam propagates through a first aberration compensation lens to a first panel, and a second polarized light beam propagates through a second aberration compensation lens to a second panel. According to one embodiment, the polarizer separating plate includes two sheets of glass substrates having the same thickness and the polarization separation surface is sandwiched by the two sheets of glass substrates.

Abstract: This invention provides a polarization conversion light pipe device suited for LCD- or LCoS-based projection applications. The polarization conversion light pipe device encompasses a light tunnel defined by four side reflection mirrors with a rectangular cross section. The light tunnel has a light entrance face at one end and a light exit face at the other end. A front reflection mirror having an aperture thereon is mounted on the light entrance face. A retardation plate for rotating the direction of an electric field of a polarized light beam is situated in the light tunnel. A polarization beam splitter module is situated between the exit face of the light tunnel and the retardation plate. The polarization beam splitter module has a reflective polarization beam splitting surface that is substantially 45 degree-inclined with respect to one of the side reflection mirrors.

Abstract: An illumination system suited for projection display applications is disclosed. The illumination system according to this invention includes a red light-emitting diode (R-LED) light source array, a green light-emitting diode (G-LED) light source array, and a blue light-emitting diode (B-LED) light source array. In one preferred embodiment, the R/G/B-LED light source arrays are coupled to different sides of an x-cube component. Light beams emanated from respective light source arrays are combined by the x-cube component, thereby generating a white-light source for display purposes.

Abstract: A rear projection type television having an improved projection lens system is provided. The projection lens system includes a projection lens with a central light axis at its center that is offset from a reference horizontal line. The offset projection lens projects a central light beam through two reflection mirrors that are not parallel with each other to an image projection surface of a front screen. The image projection surface of a front screen is normal to the horizontal line.