Enhanced ZScreen modulator techniques
First Claim
1. A method of displaying a stereoscopic video image, comprising:
- positioning a push-pull liquid crystal modulator that includes a pair of surface mode liquid crystal cells with orthogonal rub axes and a linear polarizer having an absorption axis bisecting the orthogonal rub axes, so that light comprising the stereoscopic video image propagates therethrough; and
driving the modulator in synchronization with fields of a field sequential image so that a transmitted image emerging from the modulator consists of right-handed circularly polarized fields alternating at field rate with left-handed circularly polarized fields;
wherein said driving comprises moving an electrical charge using a waveform comprising at least one quenching pulse in association with a holding voltage comprising a relatively brief voltage spike opposite in polarity to the holding voltage and lower in absolute voltage than the holding voltage at a beginning of a holding voltage period.
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Abstract
A method and system for use in conjunction with a push-pull liquid crystal modulator system for creating circularly polarized light of alternating handedness is provided. The method and system comprise a pair of surface mode liquid crystal cells and a driver electrically coupled to the cells. The driver is configured to move an electrical charge using a quenching pulse comprising a relatively brief voltage spike at a beginning of a waveform period. Multiple additional improvements are provided, including reducing the thickness of the LC gap (the distance between cell electrode plates), creating a charge connection or wiring connection to the cell electrodes, employing anti-reflection coating technology, thinner ITO and ITO index matched to the LC material, bonding all possible air to material surfaces, using superior glass, employing more efficient polarizers, and reducing projector blanking time.
122 Citations
25 Claims
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1. A method of displaying a stereoscopic video image, comprising:
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positioning a push-pull liquid crystal modulator that includes a pair of surface mode liquid crystal cells with orthogonal rub axes and a linear polarizer having an absorption axis bisecting the orthogonal rub axes, so that light comprising the stereoscopic video image propagates therethrough; and driving the modulator in synchronization with fields of a field sequential image so that a transmitted image emerging from the modulator consists of right-handed circularly polarized fields alternating at field rate with left-handed circularly polarized fields; wherein said driving comprises moving an electrical charge using a waveform comprising at least one quenching pulse in association with a holding voltage comprising a relatively brief voltage spike opposite in polarity to the holding voltage and lower in absolute voltage than the holding voltage at a beginning of a holding voltage period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of displaying a stereoscopic video image, comprising:
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driving a push-pull liquid crystal modulator comprising; a pair of surface mode liquid crystal cells with orthogonal rub axes; and a linear polarizer having an absorption axis bisecting the orthogonal rub axes, the push-pull liquid crystal modulator positioned so that light comprising the stereoscopic video image propagates therethrough; wherein said driving occurs in synchronization with fields of a field sequential image so that a transmitted image emerging from the modulator comprises right-handed circularly polarized fields alternating at field rate with left-handed circularly polarized fields; and further wherein said driving comprises moving an electrical charge using a waveform comprising at least one quenching pulse in association with a holding voltage comprising a relatively brief voltage spike opposite in polarity to the holding voltage and lower in absolute voltage than the holding voltage at a beginning of a holding voltage period. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A stereoscopic video image display system, comprising:
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a push-pull liquid crystal modulator comprising; a pair of surface mode liquid crystal cells with orthogonal rub axes; and a linear polarizer having an absorption axis bisecting the orthogonal rub axes, the push-pull liquid crystal modulator positioned so that a stereoscopic image propagates therethrough; wherein said push-pull liquid crystal modulator is driven in synchronization with fields of a field sequential image so that a transmitted image emerging from the modulator comprises right-handed circularly polarized fields alternating at field rate with left-handed circularly polarized fields; and further wherein said push-pull liquid crystal modulator is driven by moving an electrical charge using a waveform comprising at least one quenching pulse in association with a holding voltage comprising a relatively brief voltage spike opposite in polarity to the holding voltage and lower in absolute voltage than the holding voltage at a beginning of a holding voltage period. - View Dependent Claims (24, 25)
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Specification