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Power generating reflective-type liquid crystal displays using a reflective polariser and a polymer solar cell.

Ho Huh Y, Park B - Sci Rep (2015)

Bottom Line: We herein report the results of a study of a power generating reflective-type liquid crystal display (LCD), composed of a 90° twisted nematic (TN) LC cell attached to the top of a light-absorbing polymer solar cell (PSC), i.e., a Solar-LCD.The Solar-LCD also exhibited a significantly improved contrast ratio of more than 17-19.We believe there is a clear case for using such Solar-LCDs in new power-generating reflective-type displays; taken as a whole these results also demonstrate the possibility of their application in a number of energy-harvesting opto-electrical display devices.

View Article: PubMed Central - PubMed

Affiliation: Department of Electrophysics, Kwangwoon Univ., Wolgye-Dong, Nowon-gu, Seoul 139-701, Korea.

ABSTRACT
We herein report the results of a study of a power generating reflective-type liquid crystal display (LCD), composed of a 90° twisted nematic (TN) LC cell attached to the top of a light-absorbing polymer solar cell (PSC), i.e., a Solar-LCD. The PSC consisted of a polymer bulk-heterojunction photovoltaic (PV) layer of poly[[9-(1-octylnonyl)-9H-carbazole-2,7-diyl]-2,5-thiophenediyl-2,1,3-benzothiadiazole-4,7-diyl-2,5-thiophenediyl] and [6,6]-phenyl C71 butyric acid methyl ester (PCDTBT:PCBM70), and showed a high power conversion efficiency of about 5%. In order to improve the visibility of the Solar-LCD, between the TN-LC and the PV cells we inserted a reflective polariser of a giant birefringent optical (GBO) film. The reflectivity from the Solar-LCD was observed to be considerably increased by more than 13-15% under illumination by visible light. The Solar-LCD also exhibited a significantly improved contrast ratio of more than 17-19. We believe there is a clear case for using such Solar-LCDs in new power-generating reflective-type displays; taken as a whole these results also demonstrate the possibility of their application in a number of energy-harvesting opto-electrical display devices.

No MeSH data available.


Photograph of a power-generating reflective-type bended Solar-LCD watch (right) displaying “12:00” in the NW mode under ambient indoor light, and a multimeter (left) for monitoring the power generated from the Solar-LCD.To illustrate the clear Solar-LCD structure, a front dichroic polariser and LC cell are shown partially overlapping on a flexible GBO reflective polariser and a PSC.
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f5: Photograph of a power-generating reflective-type bended Solar-LCD watch (right) displaying “12:00” in the NW mode under ambient indoor light, and a multimeter (left) for monitoring the power generated from the Solar-LCD.To illustrate the clear Solar-LCD structure, a front dichroic polariser and LC cell are shown partially overlapping on a flexible GBO reflective polariser and a PSC.

Mentions: In order to demonstrate an application of our reflective-type Solar-LCD, we fabricated and tested a bended power-generating Solar-LCD watch, which we made by combining a flexible PCDTBT:PCBM70 PSC and a GBO reflecting polariser with a commercial TN-LCD watch containing a driving circuit. Figure 5 shows a bended reflective Solar-LCD watch in operation, displaying “12:00” in the NW mode, together with a multimeter for monitoring the power generated from the Solar-LCD. As shown in the photograph, the flexible light-absorbing PSC disappeared from the surface panel, eliminating problems caused by poor organisation in the design. The photograph also shows the clear visibilities of the reflective Solar-LCD watch under white illumination. Note that, for comparison, the final “0” is incomplete on the display due to the partial underlapping of the blackish bottom PSC beneath the LC display. Moreover, in addition to its clear visibility and high contrast, the Solar-LCD generated electricity from ambient coloured illumination, demonstrating its dual functionality as a power-generating full-colour display. The advantages of this system over previous Solar-LCDs, particularly for indoor use, lie in the clarity of the display and in its ability to generate electricity. These are the unique features of the reflective-type Solar-LCD proposed herein, which is capable of generating ~270 mW/m2 or more under typical indoor office conditions (ca. 400–500 lux, or ~5.8 W/m2), much higher than that (~100 mW/m2) of the LSC system reported7.


Power generating reflective-type liquid crystal displays using a reflective polariser and a polymer solar cell.

Ho Huh Y, Park B - Sci Rep (2015)

Photograph of a power-generating reflective-type bended Solar-LCD watch (right) displaying “12:00” in the NW mode under ambient indoor light, and a multimeter (left) for monitoring the power generated from the Solar-LCD.To illustrate the clear Solar-LCD structure, a front dichroic polariser and LC cell are shown partially overlapping on a flexible GBO reflective polariser and a PSC.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4477406&req=5

f5: Photograph of a power-generating reflective-type bended Solar-LCD watch (right) displaying “12:00” in the NW mode under ambient indoor light, and a multimeter (left) for monitoring the power generated from the Solar-LCD.To illustrate the clear Solar-LCD structure, a front dichroic polariser and LC cell are shown partially overlapping on a flexible GBO reflective polariser and a PSC.
Mentions: In order to demonstrate an application of our reflective-type Solar-LCD, we fabricated and tested a bended power-generating Solar-LCD watch, which we made by combining a flexible PCDTBT:PCBM70 PSC and a GBO reflecting polariser with a commercial TN-LCD watch containing a driving circuit. Figure 5 shows a bended reflective Solar-LCD watch in operation, displaying “12:00” in the NW mode, together with a multimeter for monitoring the power generated from the Solar-LCD. As shown in the photograph, the flexible light-absorbing PSC disappeared from the surface panel, eliminating problems caused by poor organisation in the design. The photograph also shows the clear visibilities of the reflective Solar-LCD watch under white illumination. Note that, for comparison, the final “0” is incomplete on the display due to the partial underlapping of the blackish bottom PSC beneath the LC display. Moreover, in addition to its clear visibility and high contrast, the Solar-LCD generated electricity from ambient coloured illumination, demonstrating its dual functionality as a power-generating full-colour display. The advantages of this system over previous Solar-LCDs, particularly for indoor use, lie in the clarity of the display and in its ability to generate electricity. These are the unique features of the reflective-type Solar-LCD proposed herein, which is capable of generating ~270 mW/m2 or more under typical indoor office conditions (ca. 400–500 lux, or ~5.8 W/m2), much higher than that (~100 mW/m2) of the LSC system reported7.

Bottom Line: We herein report the results of a study of a power generating reflective-type liquid crystal display (LCD), composed of a 90° twisted nematic (TN) LC cell attached to the top of a light-absorbing polymer solar cell (PSC), i.e., a Solar-LCD.The Solar-LCD also exhibited a significantly improved contrast ratio of more than 17-19.We believe there is a clear case for using such Solar-LCDs in new power-generating reflective-type displays; taken as a whole these results also demonstrate the possibility of their application in a number of energy-harvesting opto-electrical display devices.

View Article: PubMed Central - PubMed

Affiliation: Department of Electrophysics, Kwangwoon Univ., Wolgye-Dong, Nowon-gu, Seoul 139-701, Korea.

ABSTRACT
We herein report the results of a study of a power generating reflective-type liquid crystal display (LCD), composed of a 90° twisted nematic (TN) LC cell attached to the top of a light-absorbing polymer solar cell (PSC), i.e., a Solar-LCD. The PSC consisted of a polymer bulk-heterojunction photovoltaic (PV) layer of poly[[9-(1-octylnonyl)-9H-carbazole-2,7-diyl]-2,5-thiophenediyl-2,1,3-benzothiadiazole-4,7-diyl-2,5-thiophenediyl] and [6,6]-phenyl C71 butyric acid methyl ester (PCDTBT:PCBM70), and showed a high power conversion efficiency of about 5%. In order to improve the visibility of the Solar-LCD, between the TN-LC and the PV cells we inserted a reflective polariser of a giant birefringent optical (GBO) film. The reflectivity from the Solar-LCD was observed to be considerably increased by more than 13-15% under illumination by visible light. The Solar-LCD also exhibited a significantly improved contrast ratio of more than 17-19. We believe there is a clear case for using such Solar-LCDs in new power-generating reflective-type displays; taken as a whole these results also demonstrate the possibility of their application in a number of energy-harvesting opto-electrical display devices.

No MeSH data available.