Achromatic liquid crystal shutter for stereoscopic and other applications
First Claim
1. An achromatic liquid crystal shutter system, including:
- (a) a first polarizer, having an absorption axis oriented in a first direction;
(b) a first surface mode liquid crystal cell, having a rub axis oriented in a second direction; and
(c) a first analyzer, having a slow axis oriented in a third direction;
wherein the first, second, and third directions are selected so that the system is capable of being driven so as to have optimal dynamic range.
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Accused Products
Abstract
An achromatic liquid-crystal shutter with high dynamic range, good transmission, and high speed. The inventive shutter reduces the phenomenon of "ghosting" (image doubling) that typically occurs in conventional plano-stereoscopic CRT displays due to the low dynamic range of surface mode liquid crystal electro-optical shutters included within such displays. The inventive shutter reduces crosstalk, thus allowing comfortable fusion to take place. In one preferred embodiment, the inventive shutter system is driven by a carrier-less voltage signal having time-averaged voltage substantially equal to zero, so that a simple, low power driving circuit suffices to drive the shutter. A pair of the inventive achromatic shutters may be employed in a wireless mode as a selection device for a field-sequential stereoscopic electronic display system.
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Citations
33 Claims
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1. An achromatic liquid crystal shutter system, including:
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(a) a first polarizer, having an absorption axis oriented in a first direction; (b) a first surface mode liquid crystal cell, having a rub axis oriented in a second direction; and (c) a first analyzer, having a slow axis oriented in a third direction;
wherein the first, second, and third directions are selected so that the system is capable of being driven so as to have optimal dynamic range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An achromatic liquid crystal shutter system, including:
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(a) a first linear polarizer having a first absorption axis; (b) a surface mode liquid crystal cell with a rub axis oriented at a first angle with respect to the first absorption axis; and (c) an elliptical polarizer unit having a slow axis oriented at a second angle with respect to the rub axis, where the first and second angles are selected so that the system is capable of being driven so as to have optimal dynamic range. - View Dependent Claims (15, 16, 17, 18, 19)
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20. An achromatic liquid crystal shutter system, including:
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(a) a first linear polarizer having a first absorption axis; (b) a second polarizer having a second absorption axis; (c) a surface mode liquid crystal cell having a first rub axis; (d) a first retardation plate having a first slow axis;
wherein;the first and second absorption axes, the first rub axis, and the first slow axis have relative orientation selected so that the system is capable of being driven so as to have optimal dynamic range. - View Dependent Claims (21, 22, 23)
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24. An achromatic shutter system capable of selecting alternating ones of the fields of a field-sequential image, including
(a) a polarizer having an absorption axis; -
(b) a surface mode liquid crystal cell having a rub axis; (c) an analyzer having a slow axis, wherein the absorption axis, the rub axis, and the slow axis have relative orientation selected so that the system may be driven so as to have optimum dynamic range; (d) a receiver capable of receiving remotely generated synchronization pluses characterizing the image; and (e) a driving circuit electrically coupled to the receiver and the cell, and capable of producing a driving voltage signal for the cell, said driving voltage signal having low voltage portions at the field rate in synchronization pulses with the image. - View Dependent Claims (25, 26, 27, 28, 29, 30)
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31. An achromatic liquid crystal shutter system, including:
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(a) a polarizer, having an absorption axis oriented in a first direction; (b) a liquid crystal cell, having an alignment layer with an alignment axis oriented in a second direction; (c) an analyzer, having a slow axis oriented in a third direction; wherein the first, second, and third directions are selected so that the system is capable of being driven so as to have optimal dynamic range. - View Dependent Claims (32)
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33. An achromatic shutter system capable of selecting alternating ones of the fields of a field sequential image, including:
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(a) a polarizer having an absorption axis; (b) a liquid crystal cell having an alignment layer with an alignment axis oriented in a second direction; (c) an analyzer having a slow axis, wherein the absorption axis, the alignment axis, and the slow axis have relative orientation selected so that the system may be driven so as to have optimum dynamic range; (d) a receiver capable of receiving remotely generated synchronization pulses characterizing the image; and (e) a driving circuit electrically coupled to the receiver and the cell and capable of producing a driving voltage signal for the cell, said driving voltage signal having low voltage portions at the field rate in synchronization pulses with the image.
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Specification