Abstract: A micro projection system includes a primary prism as a light guide device. The primary prism has a bottom face and two slope faces. A light source module and a collimation lens are arranged at the bottom face of the primary prism to project red, green, and blue lights onto one of the slope faces of the primary prism to be consolidated by a wedge prism group and reflected toward a polarization beam splitting wedge prism arranged at another slope face, where the light is split into two polarized lights that are then emitted out of the primary prism to be processed and combined as light of consistent polarization by a lens array and a polarization conversion film so as to facilitate condensation and projection of the light by a polarization beam splitter and a projection lens.

Abstract: A high efficiency light combination module of projection system includes a cubic polarizing beam splitter prism serving as a main body around which four lens arrays, three retarders, and three optical plates are arranged, which is used in combination with coatings that enables transmission or reflection of specific lights to allow different color lights incident from different directions to be combined as a single illumination light beam and to allow the single illumination light beam so combined to be uniform by the lens arrays to facilitate light collection and projection by a panel and a projection lens arranged behind. A polarization conversion film is set at light outgoing port to transfer the polarization states of the combined single illumination light beam into a specific polarized light for a liquid crystal projection system.

Abstract: A micro projection system includes a primary prism as a light guide device. The primary prism has a bottom face and two slope faces. A light source module and a collimation lens are arranged at the bottom face of the primary prism to project red, green, and blue lights onto one of the slope faces of the primary prism to be consolidated by a wedge prism group and reflected toward a polarization beam splitting wedge prism arranged at another slope face, where the light is split into two polarized lights that are then emitted out of the primary prism to be processed and combined as light of consistent polarization by a lens array and a polarization conversion film so as to facilitate condensation and projection of the light by a polarization beam splitter and a projection lens.

Abstract: A polarized light converting system is disclosed in the present invention. The converting system includes a polarizing splitting unit, for splitting an unpolarized incident light beam into a first polarized light beam and a second polarized light beam, passing the second polarized light beam, and reflecting the first polarized light beam; a reflector for reflecting the second polarized light beam back through the polarizing splitting unit; a condensing unit, for guiding the condensed first polarized light beam through a first area and the condensed second polarized light beam through a second area which does not overlap the first area; and a retarder unit placed at either the first area or the second area for converting the unpolarized incident light beam into polarized light beams having the same polarization state such that illumination efficiency can be increased.

Abstract: An illumination system for a projection display is disclosed in the present invention. The illumination system has three light sources for providing three primary color rays, two collimators for collimating the rays into light beams, and two beam splitters for reflecting and passing the light beams to make white light available. It can also include three light sources, one collimator and three individual beam splitters. The illumination system has a compact size and low manufacturing cost. Its lighting efficiency is better than that of a conventional illumination system. Hence, it is suitable for small size projectors.

Abstract: A projection system includes a multi-laser beam generator, a beam switching device, a split beam projecting device and a transmissive light valve. The multi-laser beam generator selectively generates a red beam, a green beam and a blue beam. The beam switching device receives the red, green and blue beams, splits the red, green and blue beams into a plurality of light beams of different angles, and directs the red, green and blue beams of the different angles into a common optical path. The split beam projecting device includes a plurality of micro-lenses. The transmissive light valve has a plurality of pixels for receiving the red, green and blue beams that are guided by the split beam projecting device. The red, green and blue beams of the different angles are received by the micro-lenses and guided onto the pixels of the transmissive light valve for imagining on the pixels.

Abstract: A projector includes an invisible light addressing unit, a light synthesizing plane, a visible light valve, and a projection lens. The invisible light addressing unit includes a sequentially-controlled light shifter able to generate a plurality of addressed invisible sub beams sequentially. The visible light valve can be turned on by the addressed invisible sub beams to allow a visible light source to go through, thereby generating a plurality of visible beams.

Abstract: An optical projection system can receive a red light beam, green light beam, and blue light beam. The optical projection system includes a color-combination prism, and the light beams respectively enter the color-combination prism from three surfaces and are combined into a mixed light beam, which exits from another surface. A projection lens set receives the mixed light beam to perform the projection. Each of the light beams further includes a liquid crystal reflection panel and a wire grid polarizer (WGP). The liquid crystal reflection panel is parallel to the corresponding surfaces of the color-combination prism. In the design, before the light beam entering the color-combination prism, they are first reflected by the WGP onto the liquid crystal reflection panel, and the liquid crystal reflection panels respectively with a polarizing state reflect the light beams, passing through the WGP and directly propagating toward the color-combination prism.

Abstract: An optical projection system has a parallel light source for producing a parallel light beam. A first color splitter splits the parallel light beam into a first color beam and a color mixing beam. The color mixing beam includes a second color beam and a third color beam. A first both-side telecentric group is disposed on a first light path of the first color beam, so as to transform into a first light beam. A second both-side telecentric group is disposed on a second light path of the color mixing beam. A second color splitter is disposed on the second light path to split the color mixing beam into a second light beam and a third light beam. A light-combining unit receives the first, second, and third light beams and combines into a mixed beam. Then the mixed beam is projected.

Abstract: An optical projection system has a parallel light source for producing a parallel light beam. A first color splitter splits the parallel light beam into a first color beam and a color mixing beam. The color mixing beam includes a second color beam and a third color beam. A first both-side telecentric group is disposed on a first light path of the first color beam, so as to transform into a first light beam. A second both-side telecentric group is disposed on a second light path of the color mixing beam. A second color splitter is disposed on the second light path to split the color mixing beam into a second light beam and a third light beam. A light-combining unit receives the first, second, and third light beams and combines into a mixed beam. Then the mixed beam is projected.

Abstract: An optical projection system can receive a red light beam, green light beam, and blue light beam. The optical projection system includes a color-combination prism, and the light beams respectively enter the color-combination prism from three surfaces and are combined into a mixed light beam, which exits from another surface. A projection lens set receives the mixed light beam to perform the projection. Each of the light beams further includes a liquid crystal reflection panel and a wire grid polarizer (WGP). The liquid crystal reflection panel is parallel to the corresponding surfaces of the color-combination prism. In the design, before the light beam entering the color-combination prism, they are first reflected by the WGP onto the liquid crystal reflection panel, and the liquid crystal reflection panels respectively with a polarizing state reflect the light beams, passing through the WGP and directly propagating toward the color-combination prism.

Abstract: An optical system for a projection display comprising a light source; an illumination module for receiving light from the light source; a prism assembly including a first prism pair consisting of a first prism and a second prism, and a second prism pair consisting of a third prism and a fourth prism, wherein a first dichroic mirror is provided in between the first prism and the second prism, and a second dichroic mirror is provided in between the third prism and the fourth prism, a polarizing beam splitter is provided in between the first prism pair and the second prism pair; a projection lens; and first to third reflective light valves for changing the polarity of light and for reflecting light to the prism assembly.

Abstract: The present invention generally relates to an optical projecting system having a light generating means, a light splitting and synthesizing means, a beam polarization converter, a red light reflective crystal panel, a green light reflective crystal panel, a blue light reflective liquid crystal panel and a projecting lens. The beam polarization converter polarizes lights to a specific polarization distribution. Further the light splitting and synthesizing means splits the polarized light to three beams with different colors respectively. Thus, three different color beams are modulated by three reflective liquid crystal panels to produce three color projecting beams. After the light splitting and synthesizing means synthesizes the color projecting beams, the synthesized projecting light is emitted out via the projecting lens.

Abstract: The present invention generally relates to an optical projecting system having a light generating means, a light splitting and synthesizing means, a beam polarization converter, a red light reflective crystal panel, a green light reflective crystal panel, a blue light reflective liquid crystal panel and a projecting lens. The beam polarization converter polarizes lights to a specific polarization distribution. Further the light splitting and synthesizing means splits the polarized light to three beams with different colors respectively. Thus, three different color beams are modulated by three reflective liquid crystal panels to produce three color projecting beams. After the light splitting and synthesizing means synthesizes the color projecting beams, the synthesized projecting light is emitted out via the projecting lens.

Abstract: The invention relates to a liquid crystal display projector with a lens protecting device capable of protecting and positioning lens of liquid crystal display projector. The lens protecting device of the invention comprises a cover, a top housing, a bottom housing, an actuating device, a plurality of springs and a mirror, where the lens is secured in the top housing and the actuating device also is connected to the top housing. Moreover, the mirror is located in the cover, and the top housing and the bottom housing are connected to each other by said springs. Further, the cover can be connected to the top housing or the projector with at least one hinge and projection of the projector is adjusted by only rotating the cover around the hinge. When the top housing is gradually covered by the cover, the actuating device will touch the top housing and deform these springs such that the top housing is located into the LCD projector and the lens is located in the protecting position.