Abstract: A surgical light includes a light guide plate and a plurality of LEDs. The light guide plate has a light incident surface, a reflecting surface and a light exit surface. The reflecting surface defines an optical axis passing through the center of the light guide plate. A plurality of reflecting structures are formed on the reflecting surface, and are distributed symmetrically about the optical axis. The light emitted by the plurality of LEDs enters the light guide plate in the same direction, is then reflected by the reflecting structures, and exits from the light exit surface. The exited light defines a plurality of focal points, which are spaced apart from the conducting plate at different distances and cooperatively define a predetermined depth of focus so that an object within the depth of focus can receive adequate luminous intensity.

Abstract: A light emitting diode apparatus comprises a substrate having a circuit pattern, a reflection layer disposed on the substrate, at least one light emitting element disposed on the reflection layer, a reflector disposed around the at t one light emitting element, a sealing material formed over the at least one light emitting element and a phosphor layer disposed over the sealing material. The light emitting element comprises a conductive portion electrically coupled to the circuit pattern. In one embodiment, a plurality of light emitting elements are linearly arrayed, and a spacer is disposed between every two adjacent light emitting elements.

Abstract: A light emitting diode apparatus comprises a substrate having a circuit pattern, a reflection layer disposed on the substrate, at least one light emitting element disposed on the reflection layer, a reflector disposed around the at least one light emitting element, a sealing material formed over the at least one light emitting element and a phosphor layer disposed over the sealing material. The light emitting element comprises a conductive portion electrically coupled to the circuit pattern. In one embodiment, a plurality of light emitting elements are linearly arrayed, and a spacer is disposed between every two adjacent light emitting elements.

Abstract: An LCD projector includes: a light source assembly for supplying light source required for the LCD projector; an image generating mechanism for generating image to be projected, having an LCD panel; a projection objective lens assembly for projecting the image generated by the image generating mechanism onto a screen; and a cooling mechanism for cooling off the surface of the LCD panel of which the temperature is raised due to the radiation of the light source. A thermal diffusion film having good transparency and thermal diffusivity is attachd to the surface of the LCD panel on the one side nearer to the light source assembly so as to facilitate homogeneous thermal diffusion in the surface of the LCD panel, and thus prevent deterioration of quality of projected image due to thermal shimmering caused by cooling air flow coming from the cooling mechanism.

Abstract: A backlighting system for liquid crystal display (LCD) panels is disclosed to comprise at least a light source and a light pipe for receiving the light generated by the light source to provide the backlighting for the LCD panel. The light pipe consists of a flat front surface facing the LCD panel, a back surface facing the opposite direction to the LCD panel, and an end surface adjacent to the light source. The front surface extends toward the longitudinal direction away from the light source. The back surface consists of a plurality of parallel sections in parallel with the front surface, and connecting sections connecting adjacent parallel sections. The gap between the parallel section and the front surface decreases as the distance between the parallel section and the light source in the longitudinal direction increases.