See Through Film with Unidirectionally Visible Projection Image for Augmented Reality
|關鍵字:||散射微結構;短焦投影機;單向投影成像透視膜片;稜鏡微結構;虛擬資訊顯示媒介;擴增實境;Scattering microstructure;short focal projector;unidirectional transparent screen;prism;display of virtual information;augmented reality|
Micro optics and display system laboratory have developed the transparent screen successfully. The scattering microstructure was constructed by the lens, and the short focal projector projected the image on the transparent screen. Users can observe the projection screen and the object behind the transparent screen, but there is a bright spot resulted from the projector which called glare phenomenon. If the transparent screen is used in a place where is full of people, the glare phenomenon causes the nonusers to get an uncomfortable sense of vision. This thesis presents a design process of unidirectional transparent screen. The micro structure film is made of the prism, the slivered surface, and the rough surface. Left part of the screen is made of the prism and the silvered surface. The purpose of the silver is to block the rays toward the left user and to reflect light to the right user. This structure makes a unidirectional observing system. Right part of the screen is a rough surface which can be imaged on itself due to the rays from left part, then the right user’s eye can receive the scattered light from the rough surface. The performance of design was proved by Light Tools optical simulation software. It’s parallel transmittance is 78%, and the luminance ratio of each user’s eyes is 1:22. The unidirectional transparent screen could be a display of virtual information applied on projection-based augmented reality system. Furthermore, the system could be combined with touch panel then achieves visual perception and tactile perception of augmented reality.