期刊
IEEE ACCESS
卷 9, 期 -, 页码 78153-78164出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/ACCESS.2021.3082564
关键词
Image resolution; Laser beams; Optical polarization; Optical devices; Optical imaging; Surface emitting lasers; Optical variables control; Birefringence; digital micromirror device (DMD); resolution enhancement; static components
资金
- National Key Research and Development Program of China [2017YFA0205700]
- National Natural Science Foundation of China [61774131, 11621101]
- Ningbo Science and Technology Project [2020G012]
- Fundamental Research Funds for the Central Universities [2019FZA5002]
This paper introduces a resolution-enhanced system for digital micromirror device (DMD) projected images using time multiplexing and birefringence, with the aim of achieving high resolution display with static components only. The system provides a less expensive solution than reducing hardware pixel size and can be applied to higher resolution displays. The functioning of the system is verified through enlarged images of the letter 'R' and a checkerboard pattern formed from a small number of DMD pixels.
In this paper we present a resolution-enhanced system for digital micromirror device (DMD) projected images by utilizing time multiplexing and birefringence in order to achieve this with static components only. This provides a less expensive solution than reducing the size of the hardware pixels and can also be applied to higher resolution displays, as and when, these become available. Birefringent materials have different refractive indices for linearly polarized light with orthogonal polarization directions. A high-resolution projected image can be observed by overlapping two or three native resolution images at shifts of one half or one third of a DMD pixel diagonal respectively on successive frames. The optical components comprise a custom-made quartz plate as the birefringent component and an off-the-shelf twisted nematic liquid crystal display (TN-LCD) screen as a polarization rotator that is synchronized with the DMD frame rate. This paper covers the principle of operation and the system design. The functioning of the display is verified using enlarged images of the letter 'R' and a checkerboard pattern that are formed from a small number of DMD pixels.
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