Automatic Light Intensity Modulation Using TNC-based Artificial Iris for Smart Contact Lens | IEEE Conference Publication | IEEE Xplore

Automatic Light Intensity Modulation Using TNC-based Artificial Iris for Smart Contact Lens


Abstract:

In this paper we propose an artificial iris to tackle photophobia. This artificial iris is made with a twisted nematic cell (TNC) sandwiched between two linear polarizers...Show More

Abstract:

In this paper we propose an artificial iris to tackle photophobia. This artificial iris is made with a twisted nematic cell (TNC) sandwiched between two linear polarizers. The light attenuation performance of a commercial TNC was compared with TNCs made from 5CB and E7 liquid crystals (LC) over a standard digital voltage range of 0 to 5V, automatically controlled by a light dependent resistor (LDR). The 5CB-based TNC exhibited lower threshold voltage than commercial TNC and entire light attenuation range around 3.3V, making it compatible with low-power electronic platforms. Maximum light attenuation equivalent to that of a ND32 filter was achieved. Utilizing polarizers in cross-plane or in-plane configuration, photophobia mitigation can be achieved in outdoor and indoor environment, while minimizing power consumption.
Published in: 2023 IEEE SENSORS
Date of Conference: 29 October 2023 - 01 November 2023
Date Added to IEEE Xplore: 28 November 2023
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Conference Location: Vienna, Austria

References

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