Non-mechanical solid tunable diaphragm with a large optical aperture

Shih, Wen-Cheng; Lyu, Cheng-Huan; Chen, Bo-Jiun; Yu, Shun-Hao; Tsai, Jui-che

doi:10.1109/omn.2016.7565888

Cited by 5 publications

(3 citation statements)

References 9 publications

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“…Polymer dispersed liquid crystal (PDLC) has been shown to be a promising candidate to make a diaphragm [19], [20], light shutter [21], or display device [21]- [24]. However, using a PDLC iris diaphragm in an imaging system has not been demonstrated yet.…”

Section: Introductionmentioning

confidence: 99%

“…The intensity of transmitted light can be controlled by adjusting the external driving voltage. Compared to our earlier work focusing mainly on the PDLC iris devices themselves [19], [20], this paper explores the imaging performance using our PDLC iris. By placing the PDLC iris at the aperture position of a digital single lens reflex (DSLR) camera, our imaging system shows that the maximum PDLC transmittance of ∼77% is sufficient to provide good contrast image for photography application.…”

Section: Introductionmentioning

confidence: 99%

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Digital Photography Using a High-Transmittance Electro-Optical Iris

Chen

Lai

et al. 2019

IEEE Photonics J.

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In this paper, a tunable electro-optical iris with high transmittance, based on polymer dispersed liquid crystal (PDLC) material, and a relevant image enhancement method are combined for digital photography. Our device is controllable by adjusting the voltage and no mechanical and moving components are required so as to improve the stability. The experiments show that transmittance of light throughput is tunable from nearly 0% to 77% by gradually increasing driving voltage. The digital camera system using our PDLC iris can capture the high-contrast image in real-scene photography. To further improve the image quality, we develop an iterative image enhancement method that is able to improve the signal-to-noise ratio by ∼10 times and increase the image brightness simultaneously. The combination of the PDLC electro-optical device and a variant of the enhancement algorithm can also have the potential to be applied in optical imaging and sensing.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Digital Photography Using a High-Transmittance Electro-Optical Iris

Chen

Lai

et al. 2019

IEEE Photonics J.

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“…In this paper, we introduce a new depth camera with off-axis dual electro-optical (DEO) irises based on the polymer dispersed liquid crystal (PDLC). PDLC is a reliable material to control the transmittance of light or illumination, and has been applied in light shutters [20], displays [20]- [22], diaphragms [23], [24], and digital photography [25]. To the best of our knowledge, this is the first stereo depth camera utilizing a PDLC component.…”

Section: Introductionmentioning

confidence: 99%

Depth Camera Using High-Transmittance Off-Axis Dual Electro-Optical Irises

et al. 2019

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A depth camera prototype with high-transmittance off-axis dual electro-optical (DEO) irises is proposed. Our DEO irises are switchable through the polymer dispersed liquid crystal, and exhibit the advantages of low cost, easy fabrication, and higher transmittance compared to the traditional liquid crystal shutters. The transmittance of our device is near 75% when the driving voltage reaches about 30 V. The principle of depth measurement of our system is based on a pair of stereo images, which are captured through the left and right irises, respectively. The depth is calculated from the shifts of features between the two images. The DEO iris design, fabrication process, and depth camera prototype are demonstrated, and experimental results using our depth camera verify reliable performance for the depth measurement. Our DEO iris system therefore provides potential applications in depth sensing.

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Solid non-mechanical discretely-tunable hard-aperture diaphragm

Chang

et al. 2017

2017 International Conference on Optical MEMS and Nanophotonics (OMN)

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Non-mechanical solid tunable diaphragm with a large optical aperture

Cited by 5 publications

References 9 publications

Digital Photography Using a High-Transmittance Electro-Optical Iris

Digital Photography Using a High-Transmittance Electro-Optical Iris

Depth Camera Using High-Transmittance Off-Axis Dual Electro-Optical Irises

Solid non-mechanical discretely-tunable hard-aperture diaphragm

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