Abstract

Coatings of cholesteric liquid crystals (CLCs) have properties of narrowband optical filters. It has been proposed and tested experimentally that superimposed coatings of left- and right-handed CLCs double the peak reflectance from 0.5 to 1.0. In an alternate method a halfwave plate inserted between two coatings of left-or right-handed CLCs accomplishes the same result. As the spectra of such superimposed coatings resemble those of optimum colors, the color gamut obtained with such liquid crystal coatings approaches that of optimum colors.

© 1980 Optical Society of America

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References

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  1. J. L. Ferguson, Mol. Cryst. Liq. Cryst. 1, 293 (1966).
    [CrossRef]
  2. G. Wyszecki, W. S. Stiles, Color Science (Wiley, New York, 1967).
  3. D. M. Makow, C. L. Sanders, Nature 276, No. 5683, 48 (2Nov.1978).
    [CrossRef]
  4. D. M. Makow, Color Res. Appl. 4, No. 1, 2 (1979).
  5. D. L. MacAdam, J. Opt. Soc. Am. 25, 249, 361 (1935).
    [CrossRef]
  6. K. L. Kelly, K. S. Gibson, D. J. Nickerson, J. Opt. Soc. Am. 33, 355 (1943).
    [CrossRef]
  7. J. E. Vandegaer, Microencapsulation Processes and Applications (Plenum, New York, 1974).
    [CrossRef]

1979 (1)

D. M. Makow, Color Res. Appl. 4, No. 1, 2 (1979).

1978 (1)

D. M. Makow, C. L. Sanders, Nature 276, No. 5683, 48 (2Nov.1978).
[CrossRef]

1966 (1)

J. L. Ferguson, Mol. Cryst. Liq. Cryst. 1, 293 (1966).
[CrossRef]

1943 (1)

1935 (1)

D. L. MacAdam, J. Opt. Soc. Am. 25, 249, 361 (1935).
[CrossRef]

Ferguson, J. L.

J. L. Ferguson, Mol. Cryst. Liq. Cryst. 1, 293 (1966).
[CrossRef]

Gibson, K. S.

Kelly, K. L.

MacAdam, D. L.

D. L. MacAdam, J. Opt. Soc. Am. 25, 249, 361 (1935).
[CrossRef]

Makow, D. M.

D. M. Makow, Color Res. Appl. 4, No. 1, 2 (1979).

D. M. Makow, C. L. Sanders, Nature 276, No. 5683, 48 (2Nov.1978).
[CrossRef]

Nickerson, D. J.

Sanders, C. L.

D. M. Makow, C. L. Sanders, Nature 276, No. 5683, 48 (2Nov.1978).
[CrossRef]

Stiles, W. S.

G. Wyszecki, W. S. Stiles, Color Science (Wiley, New York, 1967).

Vandegaer, J. E.

J. E. Vandegaer, Microencapsulation Processes and Applications (Plenum, New York, 1974).
[CrossRef]

Wyszecki, G.

G. Wyszecki, W. S. Stiles, Color Science (Wiley, New York, 1967).

Color Res. Appl. (1)

D. M. Makow, Color Res. Appl. 4, No. 1, 2 (1979).

J. Opt. Soc. Am. (2)

Mol. Cryst. Liq. Cryst. (1)

J. L. Ferguson, Mol. Cryst. Liq. Cryst. 1, 293 (1966).
[CrossRef]

Nature (1)

D. M. Makow, C. L. Sanders, Nature 276, No. 5683, 48 (2Nov.1978).
[CrossRef]

Other (2)

G. Wyszecki, W. S. Stiles, Color Science (Wiley, New York, 1967).

J. E. Vandegaer, Microencapsulation Processes and Applications (Plenum, New York, 1974).
[CrossRef]

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Figures (5)

Fig. 1
Fig. 1

Reflection spectra of cholesteric liquid crystal layers: l, left-handed mixture; r, right-handed mixture; S, left-handed layer superimposed over the right-handed layer.

Fig. 2
Fig. 2

Reflection spectra of cholesteric liquid crystal layers: l1 = l2, spectra of two identical left-handed layers; m, l1 superimposed over l2; S, l1 superimposed over l2 with a halfwave plate in between.

Fig. 3
Fig. 3

Reflection spectra of cholesteric liquid crystal layers: r1 = r2, spectra of two identical right-handed layers; m, r1 superimposed over r2; S, r1 superimposed over r2 with a halfwave plate in between.

Fig. 4
Fig. 4

Chromaticity loci of colors at the luminous reflectance of 0.1166 on the basis of the CIE standard observer and source C illuminant: A, optimum colors5; B, Munsell color standard6; C, location of illuminant C; D, location of the CLC color the spectrum of which is shown by curve S in Fig. 2, and the luminous reflectance is 0.1166; E, location of the optimum color having approximately the same center wavelengths and luminous reflectance as curve S in Fig. 2.

Fig. 5
Fig. 5

Chromaticity loci of colors at the luminous reflectance of 0.2983 on the basis of the CIE standard observer and source C illuminant: A, optimum colors5; B, Munsell color standard6; C, location of illuminant C;D, location of the CLC color the spectrum of which is shown as curve S in Fig. 3, and the luminous reflectance is 0.2983; E, location of the optimum color having approximately the same center wavelengths and luminous reflectance as curve S in Fig. 3.

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