Methods of compensating liquid crystal displays using DC balancing
First Claim
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1. A method of compensating in an optical system comprising:
- retarding polarized light using a quarter-wave compensator in an on-state responsive to a first state of a DC balancing signal to provide retarded light and avoiding retarding the polarized light using the quarter-wave compensator in an off-state responsive to a second state of the DC balancing signal, that is opposite the first state;
imparting information on the retarded polarized light using a quarter-wave imager in an on-state responsive to the first state of the DC balancing signal to provide imaged retarded polarized light and avoiding imparting information on the retarded polarized light using the quarter-wave compensator in an off-state responsive to the second state of the DC balancing signal;
reflecting the imaged retarded polarized light back toward the quarter-wave compensator and the quarter-wave imager to provide reflected and retarded polarized light; and
further retarding the reflected and retarded polarized light using the quarter-wave compensator and the quarter-wave imager.
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Abstract
In a reflective mode FLC application, a ¼-wave plate compensating FLC is used in series with a ¼-wave imaging FLC to compensate for the effects of DC balancing. Alternatively, the compensating wave plate could be any odd ¼-wave multiple, such as 3λ/4, 5λ/4, etc. The FLCs are driven in synchronization between on and off states with the total effective retardation for each FLC being either none or one-half wavelength in a double pass.
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Citations
5 Claims
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1. A method of compensating in an optical system comprising:
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retarding polarized light using a quarter-wave compensator in an on-state responsive to a first state of a DC balancing signal to provide retarded light and avoiding retarding the polarized light using the quarter-wave compensator in an off-state responsive to a second state of the DC balancing signal, that is opposite the first state;
imparting information on the retarded polarized light using a quarter-wave imager in an on-state responsive to the first state of the DC balancing signal to provide imaged retarded polarized light and avoiding imparting information on the retarded polarized light using the quarter-wave compensator in an off-state responsive to the second state of the DC balancing signal;
reflecting the imaged retarded polarized light back toward the quarter-wave compensator and the quarter-wave imager to provide reflected and retarded polarized light; and
further retarding the reflected and retarded polarized light using the quarter-wave compensator and the quarter-wave imager. - View Dependent Claims (2, 3, 4, 5)
providing polarized light by reflecting light off of a polarized reflector.
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3. The method of claim 1, wherein further retarding comprises providing an output light, the method further comprising transmitting the output light through a polarizing reflector.
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4. The method of claim 1, wherein retarding the polarized light comprises retarding by an odd multiple of one-quarter of the wavelength of the polarized light.
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5. The method of claim 1 wherein retarding and further retarding comprise retarding and further retarding within the same device.
Specification