Projector has been one of the display tools for classrooms, family rooms or theaters, while the LCD display cannot be fully replaced due to its unique characteristics of adjustable view angle and size, and environmental protection issue. The mass requirement for display as viewing accessory has been applied toward the smart phone, HUD, and computers, home games, and home cinema. The throw ratio is less than 0.25 with HD format. The best performance of systems has been achieved. The partial coherence analysis has verified that the design is reached to 2.5 lps/mm within 2 × 1.5 m. Based on telecentric lens type of projection systems and Koehler illumination, optical parameters are provided. Applying Koehler illumination, the resolution of image is increased thus, the modulation transfer function of image in high spatial frequency is increased to form the high-quality illuminated image.
SHORT THROW PROJECTOR DEFINITION FULL
The projector optical system is simply with a telecentric field lens and inlet optics of symmetric double gauss or a large angle eyepiece, with a conic aspheric mirror, thus the full projection angle large than 155°. In fact, such design is not only to design wide angle projection optics but also to optimize illumination for LCoS in order to have high-quality image. The chapter discloses the design and fabrication of such kind of projector. Among optical projectors, the most challenging work is to design ultra-short throw projection systems for LCoS projector for home cinema, virtual reality (VR), head-up display (HUD) in automobile. One of applications for liquid crystal on silicon (LCoS) could be an emitted light panel for display and projection.
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