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Patterned polarization-rotating optical element and method of making the same, and 3D display
| Details |
Inventors: Gillian, Margaret Davis; Tillin, Martin David;
Assignee: Sharp Kabushiki Kaisha (Osaka, JP)
Primary Examiner: Gross; Anita Pellman
Assistant Examiner:
Attorney, Agent or Firm:
A patterned polarization-rotating optical element includes a layer of birefringent material having a thickness d and birefringence .DELTA.n, wherein the layer includes at least one first region and at least one second region, at least one of the first and second regions comprising twisted birefringent material having a fixed twist angle .phi. such that .DELTA.n.multidot.d>>.phi..multidot..lambda./.pi., where .lambda. is a wavelength in vacuum of optical radiation, so that the at least one first region provides a first fixed angle of rotation of polarization of light and the at least one second region provides a second fixed angle of rotation of polarization of light, the second angle being different from the first fixed angle. |
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DETAILED DESCRIPTION What is claimed is: 1.
A patterned polarization-rotating optical element comprising a layer of birefringent material having a thickness d and a birefringence .
DELTA.
n, wherein the layer comprises at least one first region and at least one second region, at least one of the first and second regions comprising twisted birefringent material having a fixed twist angle .
phi.
such that .
DELTA.
n.
multidot.
d>>.
phi.
.
multidot.
.
lambda.
/.
pi.
, where .
lambda.
is a wavelength in vacuum of optical radiation, so that the at least one first region provides a first fixed angle of rotation of polarization of light and the at least one second region provides a second fixed angle of rotation of polarization of light, the second angle being different from the first fixed angle.
2.
A patterned polarization-rotating optical element as claimed in claim 1 wherein the first fixed angle is substantially equal to 90 degrees.
3.
A patterned polarization-rotating optical element as claimed in claim 1, wherein the first fixed angle is substantially equal to +.
theta.
degrees and the second angle is substantially equal to -.
theta.
degrees.
4.
A patterned polarization-rotating optical element as claimed in claim 1, wherein the birefringent material is a liquid crystal polymer.
5.
A patterned polarization-rotating optical element as claimed in claim 4, wherein the liquid crystal polymer includes an anisotropic dye.
6.
A 3D display including a patterned polarization-rotating optical element as claimed in claim 1.
7.
A patterned polarization-rotating optical element comprising a layer of birefringent material having a thickness d and a birefringence .
DELTA.
n, wherein the layer comprises at least one first region and at least one second region, at least one of the first and second regions comprising twisted birefringent material having a fixed twist angle .
phi.
such that .
DELTA.
n.
multidot.
d>>.
phi.
.
multidot.
.
lambda.
/.
pi.
, where .
lambda.
is a wavelength in vacuum of optical radiation, so that the at least one first region provides a first fixed angle of rotation of polarization of light and the at least one second region provides a second fixed angle of rotation of polarization of light, the second angle being different from the first fixed angle, and wherein the second fixed angle is substantially equal to zero degrees
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LCD 
