Method and apparatus for controlling common mode electrode voltage in LCOS/LCD
First Claim
Patent Images
1. A method of controlling common mode electrode voltage in a liquid crystal display, comprising the steps of:
- applying a video signal with a predetermined color and drive level to an imager;
determining a difference between a positive field detector voltage and a negative field detector voltage; and
feeding back the difference to a controller to adjust the common mode electrode voltage.
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Abstract
A device for controlling common mode electrode voltage in a liquid crystal display includes at least a first sensor for measuring flicker resulting from applying a video signal with a predetermined color and drive level to an imager. A detector for determining a difference between a positive field detector voltage and a negative field detector voltage is used to provide a feed-back loop for feeding back the difference to a controller to adjust the common mode electrode voltage.
13 Citations
20 Claims
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1. A method of controlling common mode electrode voltage in a liquid crystal display, comprising the steps of:
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applying a video signal with a predetermined color and drive level to an imager; determining a difference between a positive field detector voltage and a negative field detector voltage; and feeding back the difference to a controller to adjust the common mode electrode voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A device for controlling common mode electrode voltage in a liquid crystal display, comprises:
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a detector for determining a difference between a positive field detector voltage and a negative field detector voltage; and a feed-back loop for feeding back the difference to a controller to adjust the common mode electrode voltage. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A device for controlling common mode electrode voltage in a liquid crystal display, comprises:
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a source of polarized light having a predetermined intensity level for illuminating at least a first sensor through a liquid crystal cell; and a detector responsive to an output of said first sensor for providing a feedback signal to adjust the common mode electrode voltage for the liquid crystal cell. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification