Abstract
An ultrashort throw liquid crystal on silicon (LCoS) projector for home cinema, virtual reality, and automobile heads-up display has been designed and fabricated. To achieve the best performance and highest-quality image, this study aimed to design wide-angle projection optics and optimize the illumination for LCoS. Based on the telecentric lens projection system and optimized Koehler illumination, the optical parameters were calculated. The projector’s optical system consisted of a conic aspheric mirror and image optics using either symmetric double Gauss or a large-angle eyepiece to achieve a full projection angle larger than 155 deg. By applying Koehler illumination, image resolution was enhanced and the modulation transfer function of the image in high spatial frequency was increased to form a high-quality illuminated image. The partial coherence analysis verified that the design was capable of 2.5 lps/mm within a 2 m×1.5 m projected image. The throw ratio was less than 0.25 in HD format.
Highlights
The requirement for a high-quality display as a viewing accessory is in high demand for smart phones, HUDs, computers, home games, and home cinema systems
The rear TV projection system involved projecting the image behind the screen, whereas the forward projectionprojecting liquid crystal on silicon (LCoS) or PLD panel projected an image in front of the screen
We introduce the Koehler structure light source to the short throw ratio projection because both are projection systems
Summary
The requirement for a high-quality display as a viewing accessory is in high demand for smart phones, HUDs, computers, home games, and home cinema systems. Of all the types of displays, projectors are used in large venues, such as the classroom and theater. Direct-view liquid crystal display (LCD) is popular, it cannot fully replace the projector because it is unable to support adjustments in viewing angle and image size. The rear TV projection system involved projecting the image behind the screen, whereas the forward projectionprojecting LCoS or PLD panel projected an image in front of the screen. Thales[4] reported several reflective designs that used the optical deviated and tilted method. These products have not gone on market
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