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US 11,143,901 B2Granted
Temperature independent LCD polarization rotators
AssigneeNational University of Singapore
InventorsEuk Jin Alexander Ling, Rakhitha Chandrasekara, Kadir Durak
Life of this patent
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Abstract
A method and circuit for operating a liquid crystal device, LCD, based polarisation rotator. The method comprises the steps of tracking a capacitance value of the LCD rotator; and controlling a driver setting to the LCD rotator based on the tracked capacitance value to achieve temperature independent operation.
Claims14
A method of operating a liquid crystal device (LCD) rotator, the method comprising the steps of:
- operating the LCD rotator in an operation state with a rotation angle corresponding to a reference capacitance of the LCD rotator;
- tracking a capacitance of the LCD rotator using an electrical connection to the LCD rotator;
- and
- controlling a driver setting to the LCD rotator to vary an operating voltage applied to the LCD rotator in the operation state using the same electrical connection to maintain the capacitance of the LCD rotator at the reference capacitance to achieve temperature independent operation.
1 more element
A control circuit for a liquid crystal device (LCD) rotator, comprising:
- a sensing portion configured for tracking a capacitance of the LCD rotator via an electrical connection to the LCD rotator with the LCD rotator in an operation state with a rotation angle corresponding to a reference capacitance;
- and
- a control portion for controlling a driver setting to the LCD rotator to vary an operating voltage applied to the LCD rotator in the operation state using the same electrical connection to maintain the tracked capacitance of the LCD rotator at the reference capacitance for the LCD rotator's temperature independent operation.
Dependencies are inferred from the claim text.