Browsing by Author "Wei, AC"

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Design and analyses of a planar zoom module as a beam expander
(2004-08-01)
Wei, AC
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Shieh, HPD
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光電工程學系
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Department of Photonics
A novel planar zoom module (PZM) is presented in this article. The PZM is realized by integrating optical elements on its surfaces with the folding optical axis and performing the zoom function by transversal rotation or motion. Its application as a multimagnification beam expander is designed, analyzed, and demonstrated.
High-reflectance composite metal coatings for planar-integrated free-space optics
(2006-02-01)
Gruber, M
;
Seiler, T
;
Wei, AC
;
光電工程學系
;
Department of Photonics
For planar-integrated free-space optical (PIFSO) systems high-reflectance thin-film coatings are crucial. Evaporated metal films are preferred for their relative technological simplicity. We propose a three-layer Al-Ag-Al coating composition that combines the high reflectance of Ag with the chemical passivity of Al and its good adherence to glass. Two special measures are taken to prevent delamination: one is an anchoring of the edges of the coating in narrow ditches that are etched into the substrate and the other is the use of an adhesive Al underlayer; to reduce absorption this underlayer is implemented only in sparsely distributed discrete areas. The optical properties of such composite coatings are investigated theoretically. The fabrication complexity is only slightly increased compared to PIFSO systems with one-layer Al reflectors. In experimental tests we verified a reflectance of approximately 98% and an adherence comparable to that of simple Al coatings. (c) 2006 Optical Society of America.
Modeling multizoned layer to improve light efficiency of organic light-emitting diode display
(2006-05-01)
Wei, AC
;
Shieh, HPD
;
光電工程學系
;
顯示科技研究所
;
Department of Photonics
A multizoned light-enhanced layer (MZ-LEL) superimposed on an organic light-emitting diode (OLED) display has been demonstrated to increase the level of the light out-coupling efficiency in the normal direction. Such an MZ-LEL has a specific profile, which has been fabricated with sufficient accuracy. Simultaneously, this study has shown that by combining Fresnel's equation into an existing ray-tracing model, the level of accuracy in the construction of the model can be increased. Such a new model applied to a previous study has reduced the modeling deviation from 50 to 4%. It has been found that a 70 x 70 pixel OLED panel laminated with an array-patterned MZ-LEL (ALEL) exhibits a gain factor of 1.28. which is consistent with the simulated value of 1.32.