Augmented reality(AR)displays are attracting significant attention and efforts.In this paper,we review the adopted device configurations of see-through displays,summarize the current development status and highlight f...Augmented reality(AR)displays are attracting significant attention and efforts.In this paper,we review the adopted device configurations of see-through displays,summarize the current development status and highlight future challenges in micro-displays.A brief introduction to optical gratings is presented to help understand the challenging design of grating-based waveguide for AR displays.Finally,we discuss the most recent progress in diffraction grating and its implications.展开更多
Retinal projection displays （RPDs） are an important development direction for head-mounted dis- plays （HMDs）. This paper reviews the literature on optical engineering aspects based on the data on advanced technolo...Retinal projection displays （RPDs） are an important development direction for head-mounted dis- plays （HMDs）. This paper reviews the literature on optical engineering aspects based on the data on advanced technology in RPD design and development. The review includes the principles and applications of four theories, e. g., the Maxwellian view and its modified modality and the monocular and binocular depth cues of stereoscopic objects in the physiology of the human visual system. To support the Maxwellian view and achieve retinal projec- tion systems with depth cues, results of previous design works were summarized using different methods and their advantages and disadvantages are analyzed. With an extremely long focal depth, a prototype of a full-color stereoscopic see-through RPD system was discussed. Finally, a brief outlook of the future development trends and applications of the RPDs was presented展开更多
Virtual reality(VR)and augmented reality(AR)have found widespread applications in education,engineering,healthcare,and entertainment.However,these near-eye displays are often bulky and heavy,and thus are not suitable ...Virtual reality(VR)and augmented reality(AR)have found widespread applications in education,engineering,healthcare,and entertainment.However,these near-eye displays are often bulky and heavy,and thus are not suitable for long-term wearing.Metalenses,with an ultra-thin formfactor,subwavelength modulation scale,and high modulation flexibility,are promising candidates to replace the conventional optics in AR display systems.In this work,we proposed and fabricated a novel reflective dielectric metalens-visor based on Pancharatnam-Berry phase with see-through capability.It achieves diffraction-limited focusing behavior for the reflected red light,while keeping a good transmission spectrum in the visible region.Hence,this single piece metalensvisor can perform the function of two integrated elements simultaneously:an eyepiece and an optical combiner,which in turn greatly reduces the weight and the size of an AR display.We have implemented a proof-of-concept AR display system employing the metalens-visor,and experimentally demonstrated color AR images with good image quality.This work reveals the great potential of multi-functional metasurface devices which enables optical integration in interdisciplinary applications including wearable displays,biological imaging,and aeronautic optical instruments.展开更多
A novel see-through display with a liquid crystal lens array was proposed.A liquid crystal Fresnel lens display（LCFLD） with a holographic screen was demonstrated.The proposed display system has high efficiency,simpl...A novel see-through display with a liquid crystal lens array was proposed.A liquid crystal Fresnel lens display（LCFLD） with a holographic screen was demonstrated.The proposed display system has high efficiency,simple fabrication,and low manufacturing cost due to the absence of a polarizer and color filter.展开更多
A more transparent budget is needed to keep track of fiscal expenditures Just what was the massive 3 trillion yuan in revenue collected by the Chinese Government last fiscal year used for? This is a big question swirl...A more transparent budget is needed to keep track of fiscal expenditures Just what was the massive 3 trillion yuan in revenue collected by the Chinese Government last fiscal year used for? This is a big question swirling around the conversation tables of a nation eager for answers. Most Chinese people are now increasingly aware of the right to know how governments at all levels spend their money and展开更多
The efficiency balance phenomenon for see-through head-mounted displays with different microstructure con- ditions can be found both theoretically and using optical simulation software. A simple mathematical calculati...The efficiency balance phenomenon for see-through head-mounted displays with different microstructure con- ditions can be found both theoretically and using optical simulation software. A simple mathematical calculation is used to determine the relationship between the real image （see-through function） energy and the virtual image energy. The simulation is based on factors taken from previous research studies. It is found that the balance value of the optical efficiency remains almost constant （66.63% to 67.38%） under different microstructure conditions. In addition, suitable conditions for the microstructures in see-through head-mounted displays for daily applications can be predicted.展开更多
基金Air Force Office of Scientific Research(FA9550-14-1-0279)Goertek Electronics.
文摘Augmented reality(AR)displays are attracting significant attention and efforts.In this paper,we review the adopted device configurations of see-through displays,summarize the current development status and highlight future challenges in micro-displays.A brief introduction to optical gratings is presented to help understand the challenging design of grating-based waveguide for AR displays.Finally,we discuss the most recent progress in diffraction grating and its implications.
文摘Retinal projection displays （RPDs） are an important development direction for head-mounted dis- plays （HMDs）. This paper reviews the literature on optical engineering aspects based on the data on advanced technology in RPD design and development. The review includes the principles and applications of four theories, e. g., the Maxwellian view and its modified modality and the monocular and binocular depth cues of stereoscopic objects in the physiology of the human visual system. To support the Maxwellian view and achieve retinal projec- tion systems with depth cues, results of previous design works were summarized using different methods and their advantages and disadvantages are analyzed. With an extremely long focal depth, a prototype of a full-color stereoscopic see-through RPD system was discussed. Finally, a brief outlook of the future development trends and applications of the RPDs was presented
基金National Key Research and Development Program(No.2020YFC2007102)National Natural Science Foundation of China(61727808,62075127&12074444)+1 种基金Guangdong Basic and Applied Basic Research Foundation(No.2020A1515011184)Guangzhou Basic and Applied Basic Research Foundation(No.202102020987)for the financial support.
文摘Virtual reality(VR)and augmented reality(AR)have found widespread applications in education,engineering,healthcare,and entertainment.However,these near-eye displays are often bulky and heavy,and thus are not suitable for long-term wearing.Metalenses,with an ultra-thin formfactor,subwavelength modulation scale,and high modulation flexibility,are promising candidates to replace the conventional optics in AR display systems.In this work,we proposed and fabricated a novel reflective dielectric metalens-visor based on Pancharatnam-Berry phase with see-through capability.It achieves diffraction-limited focusing behavior for the reflected red light,while keeping a good transmission spectrum in the visible region.Hence,this single piece metalensvisor can perform the function of two integrated elements simultaneously:an eyepiece and an optical combiner,which in turn greatly reduces the weight and the size of an AR display.We have implemented a proof-of-concept AR display system employing the metalens-visor,and experimentally demonstrated color AR images with good image quality.This work reveals the great potential of multi-functional metasurface devices which enables optical integration in interdisciplinary applications including wearable displays,biological imaging,and aeronautic optical instruments.
基金Project supported by Partner State Key Laboratory on Advanced Displays and Optoelectronics Technologies HKUST,Chinathe National Natural Science Foundation of China(Grant Nos.61435008 and 61575063)the Fundamental Research Funds for the Central Universities,China(Grant No.WM1514036)
文摘A novel see-through display with a liquid crystal lens array was proposed.A liquid crystal Fresnel lens display（LCFLD） with a holographic screen was demonstrated.The proposed display system has high efficiency,simple fabrication,and low manufacturing cost due to the absence of a polarizer and color filter.
文摘A more transparent budget is needed to keep track of fiscal expenditures Just what was the massive 3 trillion yuan in revenue collected by the Chinese Government last fiscal year used for? This is a big question swirling around the conversation tables of a nation eager for answers. Most Chinese people are now increasingly aware of the right to know how governments at all levels spend their money and
基金supported in part by the Ministry of Science and Technology,Taiwan,project number MOST104-2220-E-009-006in part by the "Aim for the Top University Plan" of the National Chiao Tung University and the Ministry of Education,Taiwan,China
文摘The efficiency balance phenomenon for see-through head-mounted displays with different microstructure con- ditions can be found both theoretically and using optical simulation software. A simple mathematical calculation is used to determine the relationship between the real image （see-through function） energy and the virtual image energy. The simulation is based on factors taken from previous research studies. It is found that the balance value of the optical efficiency remains almost constant （66.63% to 67.38%） under different microstructure conditions. In addition, suitable conditions for the microstructures in see-through head-mounted displays for daily applications can be predicted.
