Method for controlling an index modulation of a switchable polymer dispersed liquid crystal optical component
First Claim
1. A method for controlling an index modulation of a switchable polymer dispersed liquid crystal optical component comprising:
- providing a pre-polymer liquid crystal material between a first and second substrate, the first and second substrate having a first and second electrode pattern thereon, respectively, for applying a switching voltage to the switchable polymer dispersed liquid crystal optical component, wherein at least one each of the first and second electrode patterns consists of interdigitated electrodes;
applying a voltage approximately equal to the switching voltage to only every other interdigitated electrode, creating an in-plane electric field within the pre-polymer liquid crystal material;
holographically irradiating the pre-polymer liquid crystal material resulting in polymerization of the pre-polymer liquid crystal, wherein liquid crystal droplets formed from the holographic irradiation are formed with symmetry axes oriented in a same direction as the in-plane electric field; and
removing the voltage approximately equal to the switching voltage once polymerization is complete.
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Abstract
Described herein are the materials, mechanisms and procedures for optimizing various performance parameters of HPDLC optical devices in order to meet differing performance requirements. These optimization tailoring techniques include control and independent optimization of switchable HPDLC optical devices to meet the demanding requirements of anticipated applications for, inter alia, the telecommunications and display industries. These techniques include optimization of diffraction efficiency, i.e., index modulation, polarization dependence control, haze, cosmetic quality, control of response and relaxation time, voltage driving for on and off switching, and material uniformity. This control and independent optimization tailors properties of switchable HPDLC optical devices according to the specific requirements of the application of the switchable HPDLC optical device. The invention disclosed herein retains the desirable attributes of the multi-functional acrylate system for forming HPDLC optical devices, but adds new materials to the acrylate system and/or new process control to the recording to optimize performance parameters as may be needed for specific applications. This results in high optical quality switchable holograms with good diffraction efficiency and low, stable switching voltage.
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Citations
11 Claims
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1. A method for controlling an index modulation of a switchable polymer dispersed liquid crystal optical component comprising:
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providing a pre-polymer liquid crystal material between a first and second substrate, the first and second substrate having a first and second electrode pattern thereon, respectively, for applying a switching voltage to the switchable polymer dispersed liquid crystal optical component, wherein at least one each of the first and second electrode patterns consists of interdigitated electrodes; applying a voltage approximately equal to the switching voltage to only every other interdigitated electrode, creating an in-plane electric field within the pre-polymer liquid crystal material; holographically irradiating the pre-polymer liquid crystal material resulting in polymerization of the pre-polymer liquid crystal, wherein liquid crystal droplets formed from the holographic irradiation are formed with symmetry axes oriented in a same direction as the in-plane electric field; and removing the voltage approximately equal to the switching voltage once polymerization is complete. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification