Liquid crystal variable drive voltage
First Claim
1. A method for operating a multi-segment polarization switch, comprising:
- providing, for a segment of the multi-segment polarization switch, a relax voltage function, wherein the relax voltage function is a continuous function that decreases a provided voltage from a driven voltage to a relaxed voltage in a continuous manner that results in a reduced optical bounce of the segment of the multi-segment polarization switch, wherein the relax voltage function provided to the segment is independent and time-shifted from relax voltage functions provided to adjacent segments of the multi-segment polarization switch;
providing during the relax voltage function, a first pulse of limited duration from a light source to the segment of the multi-segment polarization switch, wherein the light source is enabled according to a pulse function;
providing a second pulse of limited duration from the light source; and
providing, for the segment of the multi-segment polarization switch, a drive voltage function, wherein the drive voltage function is a discontinuous function, wherein the drive voltage function provided to the segment of the multi-segment polarization switch is independent and time-shifted from drive voltage functions provided to adjacent segments of the multi-segment polarization switch, wherein the drive voltage increases the provided voltage from the relaxed voltage to the driven voltage, and wherein a time difference between a start of the first pulse of limited duration and a start of the second pulse of limited duration is less than the time difference from a start of the relax voltage function and a start of the drive voltage function.
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Accused Products
Abstract
A voltage may be provided to a liquid crystal addressable element as part of a liquid crystal device. The provided voltage may be reduced from a driven state to a relaxed state in a time period greater than 1 μs. The reduction may further be performed in less than 20 ms. The liquid crystal device may be a polarization switch, which in some embodiments may be a multi-segment polarization switch. In one embodiment, pulses of limited duration of a light source may be provided to the polarization switch. The manner of voltage reduction may reduce optical bounce of the liquid crystal device and may allow one or more of the pulses of the light source to be shifted later in time.
185 Citations
20 Claims
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1. A method for operating a multi-segment polarization switch, comprising:
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providing, for a segment of the multi-segment polarization switch, a relax voltage function, wherein the relax voltage function is a continuous function that decreases a provided voltage from a driven voltage to a relaxed voltage in a continuous manner that results in a reduced optical bounce of the segment of the multi-segment polarization switch, wherein the relax voltage function provided to the segment is independent and time-shifted from relax voltage functions provided to adjacent segments of the multi-segment polarization switch; providing during the relax voltage function, a first pulse of limited duration from a light source to the segment of the multi-segment polarization switch, wherein the light source is enabled according to a pulse function; providing a second pulse of limited duration from the light source; and providing, for the segment of the multi-segment polarization switch, a drive voltage function, wherein the drive voltage function is a discontinuous function, wherein the drive voltage function provided to the segment of the multi-segment polarization switch is independent and time-shifted from drive voltage functions provided to adjacent segments of the multi-segment polarization switch, wherein the drive voltage increases the provided voltage from the relaxed voltage to the driven voltage, and wherein a time difference between a start of the first pulse of limited duration and a start of the second pulse of limited duration is less than the time difference from a start of the relax voltage function and a start of the drive voltage function. - View Dependent Claims (2, 3, 4, 5, 16)
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6. A system comprising:
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a liquid crystal (LC) display, wherein the LC display comprises a multi-segment polarization switch; a voltage source configured to, for a segment of the multi-segment polarization switch, apply a relax voltage function to the segment of the multi-segment polarization switch, wherein the relax voltage function is a continuous function that decreases the provided voltage from a driven voltage to a relaxed voltage in a continuous manner that results in a reduced optical bounce of the segment of the multi-segment polarization switch, wherein the relax voltage function applied to the segment is independent and time-shifted from relax voltage functions applied to adjacent segments of the multi-segment polarization switch; and a light source enabled according to a pulse function, wherein the light source is configured to; provide during the relax voltage function, a first pulse of limited duration; and provide a second pulse of limited duration; and wherein the voltage source is further configured to, for the segment of the multi-segment switch, apply a drive voltage function, wherein the drive voltage function is a discontinuous function, wherein the drive voltage function provided to the segment of the multi-segment polarization switch is independent and time-shifted from drive voltage functions provided to adjacent segments of the multi-segment polarization switch, wherein the drive voltage increases the provided voltage from the relaxed voltage to the driven voltage, and wherein a time difference between a start of the first pulse of limited duration and a start of the second pulse of limited duration is less than the time difference from a start of the relax voltage function and a start of the drive voltage function. - View Dependent Claims (7, 8, 9, 10, 17, 19)
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11. A non-transitory computer readable memory medium storing program instructions executable by a processor to:
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apply, to a segment of a multi-segment polarization switch, a relax voltage function to the segment of the multi-segment polarization switch, wherein the relax voltage function is a continuous function that decreases a provided voltage from a driven voltage to a relaxed voltage in a continuous manner that results in a reduced optical bounce of the segment of the multi-segment polarization switch, wherein the relax voltage function applied to the segment of the multi-segment polarization switch is independent and time-shifted from relax voltage functions applied to adjacent segments of the multi-segment polarization switch; provide during the relax voltage function, a first pulse of limited duration from a light source to the segment of the multi-segment polarization switch, wherein the light source is enabled according to a pulse function; provide a second pulse of limited duration from the light source; and apply, to the segment of the multi-segment polarization switch, a drive voltage function, wherein the drive voltage function is a discontinuous function, wherein the drive voltage function provided to the segment of the multi-segment polarization switch is independent and time-shifted from drive voltage functions provided to adjacent segments of the multi-segment polarization switch, wherein the drive voltage increases the provided voltage from the relaxed voltage to the driven voltage, and wherein a time difference between a start of the first pulse of limited duration and a start of the second pulse of limited duration is less than the time difference from a start of the relax voltage function and a start of the drive voltage function. - View Dependent Claims (12, 13, 14, 15, 18, 20)
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Specification