Abstract

A polarizer-free flexible and reflective electro-optical switch using dye-doped liquid crystal (LC) gels is demonstrated. The electro-optical performances of both scattering and absorption based dye-doped LC gels depend on curing temperatures due to domain sizes of polymer networks. Such flexible electro-optical switch is bendable and trim-able because of the vertical polymer networks and gel-like materials. The dye-doped LC gel shows good reflectance ~55%, good contrast ratio~450:1 and fast response~6.4ms at curing temperature 10 °C. The bending curvature is 21 mm. The dye-doped LC gels open a new window for trim-able electronic papers, decorative displays, electrically switchable curtains, and electrically switchable sun control film for the automobiles, homes or commercial buildings

© 2008 Optical Society of America

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2007 (5)

P. C. Wang and A. G. MacDiarmid, “Integration of polymer-dispersed liquid crystal composites with conducting polymer thin films toward the fabrication of flexible display devices,” Displays 28, 101–104 (2007).
[CrossRef] [PubMed]

A. Khan, I. Shiyanovskaya, T. Schneider, E. Montbach, D. J. Davis, N. Miller, D. Marhefka, T. Ernst, F. Nicholson, and J. W. Doane, “Progress in flexible and drapable reflective cholesteric displays,” J. Soc. Inf. Disp. 15, 9–16 (2007).
[CrossRef] [PubMed]

H. W. Ren, S. T. Wu, and Y. H. Lin, “Single glass substrate liquid crystal device using electric field-enforced phase separation and photoinduced polymerization,” Appl. Phys. Lett. 90, 191105 (2007).
[CrossRef] [PubMed]

J. Daniel, A. C. Arias, W. Wong, R. Lujan, S. Ready, B. Krusor, and R. Street, “Jet-printed active-matrix backplanes and electrophoretic displays,” Jpn. J. Appl. Phys. Part 1 46, 363–1369 (2007).
[CrossRef]

K. H. Liu, C. Y. Lee, C. T Ho, H. L. Cheng, S. T Lin, H. C. Tang, C. W. Kuo, C. C. Liao, H. P. Shieh, and W. Y. Chou, “Innovative plasma alignment method in flexible liquid crystal display films,” Electrochem. Solid State Lett. 10, J132–J135 (2007).
[CrossRef]

2006 (8)

Y. H. Lin, H. Ren, S. Gauza, Y. H. Wu, Y. Zhou, and S. T. Wu, “High contrast and fast response polarizationindependent reflective display using a dye-doped dual-frequency liquid crystal gel,” Mol. Cryst. Liq. Cryst. 453, 371–378 (2006).
[CrossRef] [PubMed]

Y. Yin, S. V. Shiyanovskii, and O. D. Lavrentovich, “Electric heating effects in nematic liquid crystals,” J. Appl. Phys. 100, 024906 (2006).
[CrossRef] [PubMed]

Y. H. Lin, H. Ren, Y. H. Wu, W. Y. Li, X. Liang, and S. T. Wu, “High Performance Reflective and Transflective Displays Using Guest-Host Liquid Crystal Gels,” SID Tech. Digest 37, 780–782 (2006).
[CrossRef] [PubMed]

K. H. Liu, W. Y. Chou, C. C. Liao, C. T Ho, and H. P. Shieh, “Microcell liquid crystal film for high-contrast flexible display applications,” Jpn. J. Appl. Phys. 45, 7761–7765 (2006).
[CrossRef]

L. S. Zhou, A. Wanga, S. C. Wu, J. Sun, S. Park, and T. N. Jackson, “All-organic active matrix flexible display,” Appl. Phys. Lett. 88, 083502 (2006).
[CrossRef] [PubMed]

Y. H. Lin, H. Ren, S. Gauza, Y. H. Wu, Y. Zhao, J. Fang, and S. T. Wu, “IPS-LCD using a glass substrate and an anisotropic polymer film,” J. Display Technology 2, 21–25 (2006).
[CrossRef] [PubMed]

K. Chari, C. M. Rankin, D. M. Johnson, T. N. Blanton, and R. G. Capurso, “Single-substrate cholesteric liquid crystal displays by colloidal self-assembly,” Appl. Phys. Lett. 88, 043502 (2006).
[CrossRef] [PubMed]

E. A. Buyuktanir, M. Mitrokhin, B. Holter, A. Glushchenk, and J. L. West, “Flexible bistable smectic-A polymer dispersed liquid crystal display,” Jpn. J. Appl. Phys. Part 1 45, 4146–4151 (2006).
[CrossRef] [PubMed]

2005 (4)

D. Hohnholz, H. Okuzaki, and A. G. MacDiarmid, “Plastic electronic devices through line patterning of conducting polymers,” Adv. Funct. Mater. 15, 51–56 (2005).
[CrossRef] [PubMed]

A. Khan, I. Shiyanovskaya, T. Schneider, N. Miller, T. Ernst, D. Marhefka, F. Nicholson, S. Green, and G. Magyar, “Reflective cholesteric displays: from rigid to flexible,” J. Soc. Inf. Disp. 13, 169–474 (2005).
[CrossRef] [PubMed]

Y. H. Lin, H. Ren, S. Gauza, Y. H. Wu, X. Liang, and S. T. Wu, “Reflective direct-view displays using a dye-doped dual-frequency liquid crystal gel,” IEEE/OSA J. Display Technology 1, 230–233 (2005).
[CrossRef] [PubMed]

C. H. Wen and S. T. Wu, “Dielectric heating effects of dual-frequency liquid crystals,” Appl. Phys. Lett. 86, 231104 (2005).
[CrossRef] [PubMed]

2004 (5)

A. Sugimoto, H. Ochi, S. Fujimura, A. Yoshida, T. Miyadera, and M. Tsuchida, “Flexible OLED displays using plastic substrates,” IEEE J. Sel. Top. Quantum Electron. 10, 107–114 (2004).
[CrossRef] [PubMed]

Y. H. Lin, H. Ren, and S. T. Wu, “High contrast polymer-dispersed liquid crystal in a 90 Cell,” Appl. Phys. Lett. 84, 4083–4085 (2004).
[CrossRef] [PubMed]

G. H. Gelinck, H. E. A. Huitema, E. Van Veenendaal, E. Cantatore, L. Schrijnemakers, J. B. P. H Van der Putten, T. C. T. Geuns, M. Beenhakkers, J. B. Giesbers, B. H. Huisman, E. J. Meijer, E. M. Benito, F. J. Touwslager, A. W. Marsman, B. J. E Van Rens, and D. M. De Leeuw, “Flexible active-matrix displays and shift registers based on solution-processed organic transistors,” Nature Mater. 3, 106–110 (2004).
[CrossRef] [PubMed]

J. H. Kim, V. Vorflusev, and S. Kumar, “Single glass substrate LCDs using a phase separated composite organic film method,” Displays 25, 207–213 (2004).
[CrossRef] [PubMed]

J. P. A. Vogels, S. I. Klink, R. Penterman, H. D. Koning, E. E. A. Huitema, and D. J. Broer, “Robust flexible LCDs with paintable technology,” J. Soc. Inf. Disp. Tech. Dig. 35, 767–769 (2004).
[CrossRef] [PubMed]

2002 (6)

I. Kim, J. H. Kim, D. Kang, D. M. Agra-Kooijman, and S. Kumar, “Fabrication of electro-optic devices using liquid crystals with a single glass substrate,” J. Appl. Phys.,  927699–7701 (2002).
[CrossRef] [PubMed]

R. Penterman, S. L. Klink, H. de Koning, G. Nisato, and D. J. Broer, “Single-substrate liquid-crystal displays by photo-enforced stratification,” Nature 417, 55–58 (2002).
[CrossRef] [PubMed]

P. Raynes, “Liquid crystal painting,” Nature,  417, 28–29 (2002).
[CrossRef] [PubMed]

C. D. Sheraw, L. Zhou, J. R. Huang, D J Gundlach, T. N. Jackson, M. G. Kane, I. G. Hill, M. S. Hammond, J. Campi, B. K. Greening, J. Francl, and J. West, “Organic thin-film transistor-driven polymer-dispersed liquid crystal displays on flexible polymeric substrates,” Appl. Phys. Lett. 80, 1088–1090 (2002).
[CrossRef] [PubMed]

A. N. Krasnov, “High-contrast organic light-emitting diodes on flexible substrates,” Appl. Phys. Lett. 80, 3853–3855 (2002).
[CrossRef] [PubMed]

J. M. Crowley, N. K. Sheridon, and L. Romano, “Dipole moments of gyricon balls,” J. Electrost. 55, 247–259 (2002).
[CrossRef] [PubMed]

2001 (1)

P. Mach, S. J. Rodriguez, R. Nortrup, P. Wiltzius, and J. A. Rogers JA, “Monolithically integrated, flexible display of polymer-dispersed liquid crystal driven by rubber-stamped organic thin-film transistors,” Appl. Phys. Lett. 78, 3592–3594 (2001).
[CrossRef] [PubMed]

1998 (1)

B. Comiskey, J. D. Albert, H. Yoshizawa, and J. Jacobson, “An electrophoretic ink for all-printed reflective electronic displays,” Nature 394, 253–255 (1998).
[CrossRef] [PubMed]

1997 (2)

P. E. Burrows, G. Gu, V. Bulovic, Z. Shen, S. R. Forrest, and M. E. Thompson, “Achieving full-color organic light-emitting devices for lightweight, flat-panel displays,” IEEE T Electron Dev. 44, 1188–1203 (1997).
[CrossRef] [PubMed]

G. Gu, P. E. Burrows, S. Venkatesh, S. R. Forrest, and M. E. Thompson, “Vacuum-deposited, nonpolymeric flexible organic light-emitting devices,” Opt. Lett. 22, 172–174 (1997).
[CrossRef] [PubMed]

1994 (1)

D. K. Yang, J. L. West, L. C. Chien, and J. W. Doane, “Control of reflectivity and bistability in displays using cholesteric liquid crystals,” J. of Appl. Phys. 76, 1331–1333 (1994).
[CrossRef] [PubMed]

Agra-Kooijman, D. M.

I. Kim, J. H. Kim, D. Kang, D. M. Agra-Kooijman, and S. Kumar, “Fabrication of electro-optic devices using liquid crystals with a single glass substrate,” J. Appl. Phys.,  927699–7701 (2002).
[CrossRef] [PubMed]

Albert, J. D.

B. Comiskey, J. D. Albert, H. Yoshizawa, and J. Jacobson, “An electrophoretic ink for all-printed reflective electronic displays,” Nature 394, 253–255 (1998).
[CrossRef] [PubMed]

Arias, A. C.

J. Daniel, A. C. Arias, W. Wong, R. Lujan, S. Ready, B. Krusor, and R. Street, “Jet-printed active-matrix backplanes and electrophoretic displays,” Jpn. J. Appl. Phys. Part 1 46, 363–1369 (2007).
[CrossRef]

Beenhakkers, M.

G. H. Gelinck, H. E. A. Huitema, E. Van Veenendaal, E. Cantatore, L. Schrijnemakers, J. B. P. H Van der Putten, T. C. T. Geuns, M. Beenhakkers, J. B. Giesbers, B. H. Huisman, E. J. Meijer, E. M. Benito, F. J. Touwslager, A. W. Marsman, B. J. E Van Rens, and D. M. De Leeuw, “Flexible active-matrix displays and shift registers based on solution-processed organic transistors,” Nature Mater. 3, 106–110 (2004).
[CrossRef] [PubMed]

Benito, E. M.

G. H. Gelinck, H. E. A. Huitema, E. Van Veenendaal, E. Cantatore, L. Schrijnemakers, J. B. P. H Van der Putten, T. C. T. Geuns, M. Beenhakkers, J. B. Giesbers, B. H. Huisman, E. J. Meijer, E. M. Benito, F. J. Touwslager, A. W. Marsman, B. J. E Van Rens, and D. M. De Leeuw, “Flexible active-matrix displays and shift registers based on solution-processed organic transistors,” Nature Mater. 3, 106–110 (2004).
[CrossRef] [PubMed]

Blanton, T. N.

K. Chari, C. M. Rankin, D. M. Johnson, T. N. Blanton, and R. G. Capurso, “Single-substrate cholesteric liquid crystal displays by colloidal self-assembly,” Appl. Phys. Lett. 88, 043502 (2006).
[CrossRef] [PubMed]

Broer, D. J.

J. P. A. Vogels, S. I. Klink, R. Penterman, H. D. Koning, E. E. A. Huitema, and D. J. Broer, “Robust flexible LCDs with paintable technology,” J. Soc. Inf. Disp. Tech. Dig. 35, 767–769 (2004).
[CrossRef] [PubMed]

R. Penterman, S. L. Klink, H. de Koning, G. Nisato, and D. J. Broer, “Single-substrate liquid-crystal displays by photo-enforced stratification,” Nature 417, 55–58 (2002).
[CrossRef] [PubMed]

Bulovic, V.

P. E. Burrows, G. Gu, V. Bulovic, Z. Shen, S. R. Forrest, and M. E. Thompson, “Achieving full-color organic light-emitting devices for lightweight, flat-panel displays,” IEEE T Electron Dev. 44, 1188–1203 (1997).
[CrossRef] [PubMed]

Burrows, P. E.

P. E. Burrows, G. Gu, V. Bulovic, Z. Shen, S. R. Forrest, and M. E. Thompson, “Achieving full-color organic light-emitting devices for lightweight, flat-panel displays,” IEEE T Electron Dev. 44, 1188–1203 (1997).
[CrossRef] [PubMed]

G. Gu, P. E. Burrows, S. Venkatesh, S. R. Forrest, and M. E. Thompson, “Vacuum-deposited, nonpolymeric flexible organic light-emitting devices,” Opt. Lett. 22, 172–174 (1997).
[CrossRef] [PubMed]

Buyuktanir, E. A.

E. A. Buyuktanir, M. Mitrokhin, B. Holter, A. Glushchenk, and J. L. West, “Flexible bistable smectic-A polymer dispersed liquid crystal display,” Jpn. J. Appl. Phys. Part 1 45, 4146–4151 (2006).
[CrossRef] [PubMed]

Campi, J.

C. D. Sheraw, L. Zhou, J. R. Huang, D J Gundlach, T. N. Jackson, M. G. Kane, I. G. Hill, M. S. Hammond, J. Campi, B. K. Greening, J. Francl, and J. West, “Organic thin-film transistor-driven polymer-dispersed liquid crystal displays on flexible polymeric substrates,” Appl. Phys. Lett. 80, 1088–1090 (2002).
[CrossRef] [PubMed]

Cantatore, E.

G. H. Gelinck, H. E. A. Huitema, E. Van Veenendaal, E. Cantatore, L. Schrijnemakers, J. B. P. H Van der Putten, T. C. T. Geuns, M. Beenhakkers, J. B. Giesbers, B. H. Huisman, E. J. Meijer, E. M. Benito, F. J. Touwslager, A. W. Marsman, B. J. E Van Rens, and D. M. De Leeuw, “Flexible active-matrix displays and shift registers based on solution-processed organic transistors,” Nature Mater. 3, 106–110 (2004).
[CrossRef] [PubMed]

Capurso, R. G.

K. Chari, C. M. Rankin, D. M. Johnson, T. N. Blanton, and R. G. Capurso, “Single-substrate cholesteric liquid crystal displays by colloidal self-assembly,” Appl. Phys. Lett. 88, 043502 (2006).
[CrossRef] [PubMed]

Chari, K.

K. Chari, C. M. Rankin, D. M. Johnson, T. N. Blanton, and R. G. Capurso, “Single-substrate cholesteric liquid crystal displays by colloidal self-assembly,” Appl. Phys. Lett. 88, 043502 (2006).
[CrossRef] [PubMed]

Cheng, H. L.

K. H. Liu, C. Y. Lee, C. T Ho, H. L. Cheng, S. T Lin, H. C. Tang, C. W. Kuo, C. C. Liao, H. P. Shieh, and W. Y. Chou, “Innovative plasma alignment method in flexible liquid crystal display films,” Electrochem. Solid State Lett. 10, J132–J135 (2007).
[CrossRef]

Chien, L. C.

D. K. Yang, J. L. West, L. C. Chien, and J. W. Doane, “Control of reflectivity and bistability in displays using cholesteric liquid crystals,” J. of Appl. Phys. 76, 1331–1333 (1994).
[CrossRef] [PubMed]

Chou, W. Y.

K. H. Liu, C. Y. Lee, C. T Ho, H. L. Cheng, S. T Lin, H. C. Tang, C. W. Kuo, C. C. Liao, H. P. Shieh, and W. Y. Chou, “Innovative plasma alignment method in flexible liquid crystal display films,” Electrochem. Solid State Lett. 10, J132–J135 (2007).
[CrossRef]

K. H. Liu, W. Y. Chou, C. C. Liao, C. T Ho, and H. P. Shieh, “Microcell liquid crystal film for high-contrast flexible display applications,” Jpn. J. Appl. Phys. 45, 7761–7765 (2006).
[CrossRef]

Comiskey, B.

B. Comiskey, J. D. Albert, H. Yoshizawa, and J. Jacobson, “An electrophoretic ink for all-printed reflective electronic displays,” Nature 394, 253–255 (1998).
[CrossRef] [PubMed]

Crawford, G. P.

G. P. Crawford, Flexible Flat Panel Displays, (England: Wiley, 2005).
[CrossRef] [PubMed]

Crowley, J. M.

J. M. Crowley, N. K. Sheridon, and L. Romano, “Dipole moments of gyricon balls,” J. Electrost. 55, 247–259 (2002).
[CrossRef] [PubMed]

Daniel, J.

J. Daniel, A. C. Arias, W. Wong, R. Lujan, S. Ready, B. Krusor, and R. Street, “Jet-printed active-matrix backplanes and electrophoretic displays,” Jpn. J. Appl. Phys. Part 1 46, 363–1369 (2007).
[CrossRef]

Davis, D. J.

A. Khan, I. Shiyanovskaya, T. Schneider, E. Montbach, D. J. Davis, N. Miller, D. Marhefka, T. Ernst, F. Nicholson, and J. W. Doane, “Progress in flexible and drapable reflective cholesteric displays,” J. Soc. Inf. Disp. 15, 9–16 (2007).
[CrossRef] [PubMed]

de Koning, H.

R. Penterman, S. L. Klink, H. de Koning, G. Nisato, and D. J. Broer, “Single-substrate liquid-crystal displays by photo-enforced stratification,” Nature 417, 55–58 (2002).
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C. D. Sheraw, L. Zhou, J. R. Huang, D J Gundlach, T. N. Jackson, M. G. Kane, I. G. Hill, M. S. Hammond, J. Campi, B. K. Greening, J. Francl, and J. West, “Organic thin-film transistor-driven polymer-dispersed liquid crystal displays on flexible polymeric substrates,” Appl. Phys. Lett. 80, 1088–1090 (2002).
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Zhou, L. S.

L. S. Zhou, A. Wanga, S. C. Wu, J. Sun, S. Park, and T. N. Jackson, “All-organic active matrix flexible display,” Appl. Phys. Lett. 88, 083502 (2006).
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Zhou, Y.

Y. H. Lin, H. Ren, S. Gauza, Y. H. Wu, Y. Zhou, and S. T. Wu, “High contrast and fast response polarizationindependent reflective display using a dye-doped dual-frequency liquid crystal gel,” Mol. Cryst. Liq. Cryst. 453, 371–378 (2006).
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Adv. Funct. Mater. (1)

D. Hohnholz, H. Okuzaki, and A. G. MacDiarmid, “Plastic electronic devices through line patterning of conducting polymers,” Adv. Funct. Mater. 15, 51–56 (2005).
[CrossRef] [PubMed]

Appl. Phys. Lett. (8)

P. Mach, S. J. Rodriguez, R. Nortrup, P. Wiltzius, and J. A. Rogers JA, “Monolithically integrated, flexible display of polymer-dispersed liquid crystal driven by rubber-stamped organic thin-film transistors,” Appl. Phys. Lett. 78, 3592–3594 (2001).
[CrossRef] [PubMed]

C. D. Sheraw, L. Zhou, J. R. Huang, D J Gundlach, T. N. Jackson, M. G. Kane, I. G. Hill, M. S. Hammond, J. Campi, B. K. Greening, J. Francl, and J. West, “Organic thin-film transistor-driven polymer-dispersed liquid crystal displays on flexible polymeric substrates,” Appl. Phys. Lett. 80, 1088–1090 (2002).
[CrossRef] [PubMed]

K. Chari, C. M. Rankin, D. M. Johnson, T. N. Blanton, and R. G. Capurso, “Single-substrate cholesteric liquid crystal displays by colloidal self-assembly,” Appl. Phys. Lett. 88, 043502 (2006).
[CrossRef] [PubMed]

H. W. Ren, S. T. Wu, and Y. H. Lin, “Single glass substrate liquid crystal device using electric field-enforced phase separation and photoinduced polymerization,” Appl. Phys. Lett. 90, 191105 (2007).
[CrossRef] [PubMed]

A. N. Krasnov, “High-contrast organic light-emitting diodes on flexible substrates,” Appl. Phys. Lett. 80, 3853–3855 (2002).
[CrossRef] [PubMed]

L. S. Zhou, A. Wanga, S. C. Wu, J. Sun, S. Park, and T. N. Jackson, “All-organic active matrix flexible display,” Appl. Phys. Lett. 88, 083502 (2006).
[CrossRef] [PubMed]

Y. H. Lin, H. Ren, and S. T. Wu, “High contrast polymer-dispersed liquid crystal in a 90 Cell,” Appl. Phys. Lett. 84, 4083–4085 (2004).
[CrossRef] [PubMed]

C. H. Wen and S. T. Wu, “Dielectric heating effects of dual-frequency liquid crystals,” Appl. Phys. Lett. 86, 231104 (2005).
[CrossRef] [PubMed]

Displays (2)

J. H. Kim, V. Vorflusev, and S. Kumar, “Single glass substrate LCDs using a phase separated composite organic film method,” Displays 25, 207–213 (2004).
[CrossRef] [PubMed]

P. C. Wang and A. G. MacDiarmid, “Integration of polymer-dispersed liquid crystal composites with conducting polymer thin films toward the fabrication of flexible display devices,” Displays 28, 101–104 (2007).
[CrossRef] [PubMed]

Electrochem. Solid State Lett. (1)

K. H. Liu, C. Y. Lee, C. T Ho, H. L. Cheng, S. T Lin, H. C. Tang, C. W. Kuo, C. C. Liao, H. P. Shieh, and W. Y. Chou, “Innovative plasma alignment method in flexible liquid crystal display films,” Electrochem. Solid State Lett. 10, J132–J135 (2007).
[CrossRef]

IEEE J. Sel. Top. Quantum Electron. (1)

A. Sugimoto, H. Ochi, S. Fujimura, A. Yoshida, T. Miyadera, and M. Tsuchida, “Flexible OLED displays using plastic substrates,” IEEE J. Sel. Top. Quantum Electron. 10, 107–114 (2004).
[CrossRef] [PubMed]

IEEE T Electron Dev. (1)

P. E. Burrows, G. Gu, V. Bulovic, Z. Shen, S. R. Forrest, and M. E. Thompson, “Achieving full-color organic light-emitting devices for lightweight, flat-panel displays,” IEEE T Electron Dev. 44, 1188–1203 (1997).
[CrossRef] [PubMed]

IEEE/OSA J. Display Technology (1)

Y. H. Lin, H. Ren, S. Gauza, Y. H. Wu, X. Liang, and S. T. Wu, “Reflective direct-view displays using a dye-doped dual-frequency liquid crystal gel,” IEEE/OSA J. Display Technology 1, 230–233 (2005).
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Supplementary Material (6)

» Media 1: MPG (496 KB)     
» Media 2: MPG (382 KB)     
» Media 3: MPG (794 KB)     
» Media 4: MPG (216 KB)     
» Media 5: MPG (1388 KB)     
» Media 6: MPG (568 KB)     

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Figures (8)

Fig. 1.
Fig. 1.

Schematic operating principle of dye-doped liquid crystal display at (a) voltage-off state and (b) voltage-on state. The alignment layer has no rubbing treatment.

Fig. 2.
Fig. 2.

The microscopic images of dye-doped LC gels at 0 Vrms and 30 Vrms.

Fig. 3.
Fig. 3.

Reflectance as a function of angle of the polarizer at different applied voltages. The curing temperature was 20 °C.

Fig. 4.
Fig. 4.

(a) Voltage-dependent reflectance at various curing temperature. (b) Curing temperature-dependent response time

Fig. 5
Fig. 5

Transmission spectra of dye-doped LC gels before (blue line) and after UV curing (pink line) at voltage-off state. The curing temperature was 20°C. Green line indicates the transmission spectra of white light source.

Fig. 6.
Fig. 6.

(a)A single pixel polarizer-free reflective LCD using the dye-doped LC gels in glass substrates at curing temperature 10 °C. (497 KB) (b) A single pixel polarizer-free reflective and flexible LCD using dye-doped LC gels at curing temperature 20 °C. (728 KB) White papers were used as diffusive reflectors. [Media 1][Media 2]

Fig. 7.
Fig. 7.

The transmission as a function of bending radius curvature of a single pixel dye-doped LC gels at at 0 and 30 Vrms. The curing temperatures was 20 °C.

Fig. 8.
Fig. 8.

A single pixel of a polarizer-free reflective and flexible LCD using dye-doped LC gels under bending at (a) 0 Vrms in transmissive mode (794KB) and (b) 30 Vrms in reflective mode (216KB), and (c) by a scissor cutting(1.35MB) (d) A single pixel of a polarizer-free reflective and flexible LCD using dye-doped dual frequency LC gels under bending. (569 KB) The curing temperatures were 20 °C in (a),(b) and (c). The curing temperature was 10 °C in (d). White papers were used as diffusive reflectors in (b),(c) and (d) [Media 3][Media 4][Media 5][Media 6]

Equations (5)

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R ( θ ) = a · e σ ( θ ) · N · 2 d · e α ( θ ) · c · 2 d
α ( θ ) = α e ( θ ) + α 2
α e ( θ ) = α · α α 2 · cos 2 ( θ ) + α 2 · sin 2 ( θ )
σ ( θ ) [ r λ ( n ( θ ) n p ) ] 2
n ( θ ) = n e · n o n e 2 · cos 2 ( θ ) + n o 2 · sin 2 ( θ )

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