Multi-functional active matrix liquid crystal displays
View Patent ↗A direct view display provides a light modulating panel and a backlight including first and second sets of spectral emitters. The first set of spectral emitters generate a first light bundle and the second set of spectral emitters generate a second light bundle. Several modes of operation may be provided including (1) an advanced 2D mode, (2) an enhanced color gamut mode employing simultaneous illumination of the first and second set of spectral emitters, (3) a privacy screen mode, (4) a channel multiplexed mode, and (5) a stereoscopic image mode. The latter three modes utilize the first and second set of spectral emitters to alternately illuminate a portion of the light modulating panel. Images and representations generated by the direct view display operating in the latter three modes are viewed using appropriate eyewear having filters with passband characteristics to transmit the respective light bundle.
1. Eyewear operable to convey a first image to a first eye and a second image to a second eye, the first image comprising a first polarized light bundle, the second image comprising a second polarized light bundle, wherein the first and second polarized light bundles comprise substantially discrete spectral components, the eyewear comprising:
a first filter comprising a first retarder stack and a first polarizer, the first polarizer having a first polarizing axis; and
a second filter comprising a second retarder stack and a second polarizer, the second polarizer having a second polarizing axis substantially orthogonal to the first polarizing axis,
wherein the first and second retarder stacks comprise substantially identical retardance.
2. Eyewear according to claim 1 , wherein the first polarized light bundle comprises:
a first spectral component selected from a pair of long band spectral components (R 1 , R 2 ),
a second spectral component selected from a pair of middle band spectral components (G 1 , G 2 ), and
a third spectral component selected from a pair of short band spectral components (B 1 , B 2 );
wherein the second polarized light bundle comprises:
fourth, fifth, and sixth spectral components comprising a complementary selection of spectral components to those selected for the first set of spectral components.
3. Eyewear according to claim 2 , wherein the R 1 and R 2 spectral components lie substantially within the sensitive wavelengths of the L-cone receptors in a human eye, wherein the G 1 and G 2 spectral components lie substantially within the sensitive wavelengths of the M-cone receptors in the human eye, and wherein the B 1 and B 2 spectral components lie substantially within the sensitive wavelengths of the S-cone receptors in the human eye.
4. Eyewear according to claim 1 , wherein the first filter has a passband characteristic operable to transmit the first light bundle, and wherein the second filter has a passband characteristic operable to transmit the second light bundle.
5. Eyewear according to claim 4 , wherein the first filter has a stopband characteristic operable to block the second light bundle, and wherein the second filter has a stopband characteristic operable to block the first light bundle.
6. Eyewear according to claim 1 , wherein the retarder stacks comprise birefringent polymer film.
7. Eyewear according to claim 1 , wherein each retarder stack comprises N≧2 retarder films, wherein each retarder stack is designed to comprise an FIR filter, and thereby is operable to generate at least N+1 spatially offset light pulses in response to a linearly polarized light impulse input, the FIR filter operable to filter at least one band of light.
8. Eyewear operable to convey a first image to a viewer and to block a second image from the viewer, the first image comprising a first polarized light bundle, the second image comprising a second polarized light bundle, wherein the first and second polarized light bundles comprise substantially discrete spectral components, the eyewear comprising:
a left eye and a right eye filter, each filter comprising:
a retarder stack; and
one and only one polarizing element having a polarization axis,
wherein the first and second retarder stacks comprise substantially identical retardance,
wherein the polarization axis of the left eye polarizing element is parallel to the polarizing axis of the right eye polarizing element.
9. Eyewear according to claim 8 , wherein the left and right eye filters have substantially identical passband characteristics.
10. Eyewear according to claim 8 , wherein the first polarized light bundle comprises:
a first spectral component selected from a pair of long band spectral components (R 1 , R 2 ),
a second spectral component selected from a pair of middle band spectral components (G 1 , G 2 ), and
a third spectral component selected from a pair of short band spectral components (B 1 , B 2 );
wherein the second set of spectral components comprises:
fourth, fifth, and sixth spectral components comprising a complementary selection of spectral components to those selected for the first set of spectral components.
11. The method according to claim 10 , wherein the R 1 and R 2 spectral components lie substantially within the sensitive wavelengths of the L-cone receptors in a human eye, wherein the G 1 and G 2 spectral components lie substantially within the sensitive wavelengths of the M-cone receptors in the human eye, and wherein the B 1 and B 2 spectral components lie substantially within the sensitive wavelengths of the S-cone receptors in the human eye.
12. Eyewear according to claim 8 , wherein each retarder stack comprises N≧2 retarder films, wherein each retarder stack is designed to comprise an FIR filter, and thereby is operable to generate at least N+1 spatially offset light pulses in response to a linearly polarized light impulse input, the FIR filter operable to filter at least one band of light.
13. Eyewear according to claim 2 , wherein R 1 has an emission peak with a longer wavelength than R 2 , wherein G 1 has an emission peak with a longer wavelength than G 2 , and wherein B 1 has an emission peak with a longer wavelength than B 2 .
14. Eyewear according to claim 2 , wherein the first/second polarized light bundles comprise one of the following combinations: R 1 G 1 B 1 /R 2 G 2 B 2 , R 1 G 2 B 1 /R 2 G 1 B 2 , R 1 G 1 B 2 /R 2 G 2 B 1 , and R 1 G 2 B 2 /R 2 G 1 B 1 .
15. Eyewear according to claim 2 the first light bundle is defined by a first RGB triangle of an EBU color gamut diagram, and the second light bundle is defined by a second RGB triangle of the EBU color gamut diagram including colors outside the first RGB triangle.