標題: | Design of a dual-f-number illumination system and its application to DMD (TM) projection displays |
作者: | Cheng, Chu-Ming Chern, Jyh-Long 光電工程學系 Department of Photonics |
關鍵字: | projection display;optical design;illumination system;digital micromirror device DMD (TM);optical collection efficiency;dual f/# |
公開日期: | 1-Sep-2006 |
摘要: | A dual-f/# optical system is evaluated and considered for illumination. Etendue theory has been employed to increase the optical throughput and collection efficiency. A classical Cooke triplet with a dual f/# is included for illustration. As a demonstration of the potential application to projection displays, an elliptically shaped illumination-pupil system is proposed to increase the optical collection efficiency in the DMD(TM) (Digital Micromirror Device(TM))-based projection system. With a dual-f/# configuration, this design can eliminate the f/2.4 constraint that was caused by the light-steering action of the narrow +/- 12 degrees tilt angles on the DMD(TM). The percentage of increase in the optical collection efficiency is 6.2% in the dual f/2.0 x f/2.4 optical projection system by using ray-tracing simulation. This method enables a lower than f/2.4 optical design with a high brightness and an adequate contrast ratio in the DMD(TM)-based projectors. |
URI: | http://dx.doi.org/10.1889/1.2358577 http://hdl.handle.net/11536/11874 |
ISSN: | 1071-0922 |
DOI: | 10.1889/1.2358577 |
期刊: | JOURNAL OF THE SOCIETY FOR INFORMATION DISPLAY |
Volume: | 14 |
Issue: | 9 |
起始頁: | 819 |
結束頁: | 827 |
Appears in Collections: | Articles |