Abstract:
본 발명은 광 스캐닝 홀로그래피 시스템에 관한 것이다. 본 발명은, 선편광 빔을 입사받아 음의 초점거리를 갖는 우현 원편광(right-handed circular polarized beam)의 제1 구면파 및 양의 초점거리를 갖는 좌현 원편광(left-handed circular polarized beam)의 제2 구면파를 생성하는 편광 감응형 렌즈와, 상기 생성된 제1 및 제2 구면파의 성분 중에서 소정 편광 방향의 빔 성분만을 통과시키는 제1 편광기와, 상기 제1 편광기를 통과한 제1 및 제2 구면파 사이에서 발생한 간섭 빔을 이용하여 대상물을 스캔하는 스캔수단, 및 상기 대상물로부터 반사된 빔을 검출하는 제1 광 검출기를 포함하는 인라인 스캐닝 홀로그래피 시스템를 제공한다. 이에 따르면, 편광 감응형 렌즈를 이용하여 단일의 광 경로에서 스캐닝 패턴을 형성함에 따라 높은 안정성 및 낮은 복잡도의 광학계 구조를 사용하여 외부 환경에 강인하고 안정적인 광 스캐닝 홀로그래피를 구현할 수 있다.
Abstract:
A switchable directional display apparatus comprises a spatial light modulator and a backlight comprising a waveguide, two light sources arranged to provide illumination through the edge of the waveguide and a switchable liquid crystal retarder. The light sources and switchable liquid crystal retarder may be controlled to provide a first operating state with a narrow field of view and a second operating state with a wide field of view. Image visibility in wide angle mode of operation may be maximised while visual security level may be maximised in a narrow angle mode of operation, to provide an efficient privacy mode of operation.
Abstract:
An imaging system is provided. The imaging system includes a display including a first display half screen and a second display half screen, a retroreflective device provided on the display, a first beam splitter facing the first display half screen, a second beam splitter facing the second display half screen, a first optical shutter located on a surface of the first beam splitter, and a second optical shutter located on a surface of the second beam splitter.
Abstract:
A time-multiplexed stereoscopic 3d projection system including a beam-splitting element to split the randomly polarized image-beam generated by a single-lens projector into one primary image-beam, possessing a first state of linear polarization, and two secondary image-beams, both possessing a second state of linear polarization. The polarization states are mutually orthogonal. The primary and secondary image-beams recombine to form a complete image on the surface of a polarization-preserving projection-screen. There are polarization modulators that modulate the first and second states of linear polarization between a left and right circular polarization state. There is a contrast enhancement film in the optical -path of the primary or secondary image-beams located between the polarization modulator and the projection-screen. The contrast enhancement film comprises a stack of at least three uniaxially stretched retardation-films which perturb the circular polarization state of said image-beams and which possess an in-plane retardation value substantially equal to 140nm, 270nm, or 540nm.