| 摘要 |
An apparatus and a method for calibrating displacement change of a diffractive part in a diffractive optical modulator are provided to receive an optical strength measuring value inputted from an optical detection part, and to output an element calibration data through a calibration value calculating part for measuring the change of the displacement and calibrating the change of the measured displacement. An apparatus for calibrating displacement change of a diffractive part comprises a memory(614), a sampling data output part(616), an optical modulator driving circuit(618), an optical detection part, a control part, and a calibration value calculating part(628). The sampling data output part reads and outputs the calibration value calculation sample data stored in the memory. The optical modulator driving circuit drives the diffractive optical modulator according to the sample data outputted from the sampling data output part. The optical detection part measures and outputs the optical strength of the diffractive light. The control part controls the sampling data output part and controls the calibration value calculating sample data to be outputted. The calibration value calculating part receives the optical strength measuring value inputted from the optical detection part and outputs the element calibration data. Thereby, a pixel matching sample data is stored in the memory. The sampling data output part outputs the pixel matching sample data to the optical modulator driving circuit. The optical detection part is a photo diode array(630). |
