Polarizing organic photovoltaics

Polarizing organic photovoltaics (ZOPV) is a concept for harvesting energy from Liquid crystal display screens,[1] developed by engineers from UCLA. This concept enables devices to use external light and the LCD screen's backlight using photovoltaic polarizers. Photovoltaic polarizers convert this light into electricity which can be used to power the device.[2] This concept also provides multifunctional capability to devices with LCD screens as they act as photovoltaic devices and as polarisers.[2][3]

## Contents

* 1 Background
* 2 Operation
* 3 Advantages
* 4 Disadvantages
* 5 See also
* 6 References
* 7 External links

## Background

A liquid crystal display (LCD) is a flat panel display, electronic visual display, video display that uses the light modulating properties of liquid crystals (LCs). LCs do not emit light directly. They are used in a wide range of applications, including computer monitors, television, instrument panels, laptops tablet computers etc.[4] They are common in consumer devices such as video players, gaming devices, clocks, watches, calculators, and telephones.

## Operation

Up to three-fourths of the light energy wasted from LCD backlight illumination can be retrieved and used using polarizing organic photovoltaics. They can use external light energy also apart from backlight illumination using photovoltaic polarizers, which are present within the structure of the LCD screen.[5][6]

## Advantages

80% to 90% of the total energy used by any device with an LCD screen is used up by the backlight illumination.[4] As polarizing organic photovoltaics can recycle up to 75% of wasted light energy, the efficiency of the device is increased.[2][7]

## Disadvantages

This simply incorporates additional conversion efficiency losses. These devices harvest their own light. The article cited above, "Photovoltaics Could Charge A Phone Using Its Own Backlight" is bogus and makes claims that would violate the 1st and 2nd laws of thermodynamics if true. Such a device thus could not be patented and commercialized. See also: Perpetual Motion Machine

## See also

* Quantum efficiency of a solar cell
* Energy conversion efficiency
* Photoelectric effect
* Solar cell efficiency

## References

1. ↑ Kumar, Ankit; Zhu, Rui; Yang, Yang (9 August 2011). "Polarizing Organic Photovoltaics". Advanced Materials 23 (1): 4193–4198. doi:10.1002/adma.201101514. PMID 21826744. Bibcode: 2011AdM....23.4193Z.
2. ↑ 2.0 2.1 2.2 Chin, Matthew; Wong Kromhout, Wileen. "Phone losing charge? Technology created by UCLA engineers allows LCDs to recycle energy". Los Angeles: University of California, Los Angeles. http://newsroom.ucla.edu/portal/ucla/ucla-engineers-invent-photovoltaic-210685.aspx.
3. ↑ Matthew Chin. "Phone losing charge? Technology created by UCLA engineers allows LCDs to recycle energy". engineer.ucla.edu. http://www.engineer.ucla.edu/newsroom/featured-news/archive/2011/phone-losing-charge-technology-created-by-ucla-engineers-allows-lcds-to-recycle-energy.
4. ↑ 4.0 4.1 "Photovoltaic LCDs let phones charge themselves". rdmag.com. http://www.rdmag.com/News/2011/08/Energy-Thin-Film-Solar-Photovoltaic-LCDs-let-phones-charge-themselves/.
5. ↑ "Photovoltaic Cells In LCDs Could Recycle Wasted And Ambient Light". The Washington Post. https://www.washingtonpost.com/business/technology/photovoltaic-cells-in-lcds-could-recycle-wasted-and-ambient-light/2011/08/15/gIQAUb16HJ_story.html. [|permanent dead link|dead link}}]
6. ↑ "Technology lets LCDs recycle energy". scienceblog.com. http://scienceblog.com/47001/technology-lets-lcds-recycle-energy/.
7. ↑ "Photovoltaics Could Charge a Phone Using its Own Backlight". PC World. 2011-08-11. http://www.pcworld.com/article/237855/photovoltaics_could_charge_a_phone_using_its_own_backlight.html.

## External links

* Polarizing Organic Photovoltaics - Supporting Information

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