Matrix Spatial Light Modulators or Controlled Transparencies

5 Matrix Spatial Light Modulators or Controlled Transparencies 

One of the most important functional elements in devices for optical information processing is the transparency (or page composer). It organizes the information in the form of an optical image which can be recorded on 

Electrically controlled transparencies do not differ in design from the matrix types described above. They can operate in both transmissive and 

The 128 X 128 and 256 x 256 electrically controlled matrix-addressed spatial light modulators with ferroelectric liquid crystals were developed (Fig. 8.9) [46]. They can be used for real-time switching of the amplitude, polarization, or phase of the visible light with frequency 3.3 ms/frame (300 Hz) and contrast ratio 100 1 [47]. 

Commercially available TFT spatial light modulators could also be applied for optical information processing. One of these modulators, with a twist liquid crystal layer and 320 x 320 pixels, provides a high quality holographic image in the optical data-processing system. 

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