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US 5,842,088 AGranted
Method of calibrating a spatial light modulator printing system
AssigneeTexas Instruments Incorporated
InventorE. Earle Thompson
Life of this patent
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Abstract
A method for calibrating a printing system using a spatial light modulator. The spatial light modulator is an array of individually activated elements, all of which are set in a predetermined state, such as the ON state. Light is then directed onto the array and the resultant light passed into the printing system from the modulator is monitored by a sensor. Discrepancies between the light expected and received at the sensor are used to adjust the operation of the modulator to compensate for stuck or non-responsive pixels.
Claims1
A method for calibrating a spatial light modulator printing system, comprising:
- a. activating all of the elements of a spatial light modulator to a predetermined state, where said predetermined state is the same state for all elements, each time said printing system is turned on;
- b. impinging light upon said modulator;
- c. monitoring light received from said modulator at a sensor, such that elements that are defective are identified by discrepancies in the light received from individual elements that is different than what was expected from those individual elements;
- and
- d. adjusting the operation of said modulator to correct any defects in printed image caused by said defective elements, using other elements in a same column as those defective elements.
2 more elements
Dependencies are inferred from the claim text.