LIGHT DEFLECTION DEVICE AND METHOD FOR DRIVING LIGHT DEFLECTION ELEMENT
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United States of America Patent
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Issued Date -
Sep 3, 2015
app pub date -
Aug 21, 2013
filing date -
Aug 28, 2012
priority date (Note) -
Abandoned
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Abstract
Provided is a light deflection device that is capable of forming a blazed-type diffraction grating while suppressing an increase in an electrode-applied voltage by using a horizontal electric field mode. A light deflection element is equipped with: a pair of glass substrates; a liquid crystal layer sandwiched between the pair of glass substrates; and a plurality of pattern electrodes arranged over a surface of the glass substrate on the side of the liquid crystal layer, with an interlayer insulation film therebetween. A driving circuit that applies voltages to the light deflection element generates electrode-applied voltages Vpixel so as to change an inter-electrode voltage VLC incrementally in the order of 0V, 3V, and 6V. The electrode-applied voltages Vpixel are a mixture of positive voltages and negative voltages.
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