Importance

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Abstract

A method and system of detecting whether the intensity of light incident a spatial light modulator varies periodically. One embodiment provides a method of operating a spatial light modulator, the method comprising: determining a peak level of light incident the modulator over a period of time; setting a threshold level equal to a fraction of the peak level; monitoring a current level of light incident the modulator; comparing the current level of light and the threshold level; and disabling the modulator based on the comparison. Another embodiment provides a modulator array. The modulator comprises: a photosensitive circuit for outputting a light intensity signal representative of a level of light incident the photosensitive circuit; a threshold detection circuit 400 receiving the light intensity signal 402 and outputting an under threshold signal 408 indicative of whether the intensity signal is less than a threshold level; and a duty cycle detection circuit 410 for monitoring the under threshold signal 408 and outputting a disable signal 418 indicative of the duty cycle of the under threshold signal 408. The preceding abstract is submitted with the understanding that it only will be used to assist in determining, from a cursory inspection, the nature and gist of the technical disclosure as described in 37 C.F.R. .sctn.1.72(b). In no case should this abstract be used for interpreting the scope of any patent claims.

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First Claim