A lcos spatial modulator for light comprising:a plurality of pixels diodes (112), which are arranged in two dimensions, and which are provided with a modulation surface (206) defined;a signal generating circuit (201), which a displacement signal and generates a reset signal;a pixel selection circuit (203, 204, 212a, 212b), which selects a pixel diode on the basis of the displacement signal and the back setting signal and the a data signal in the selected pixels; anda display surface - selection circuit (42) of a desired display area (500, 503) selects from the modulation surface,the modulation surface is divided into a plurality of divided modulation surfaces (806a, 806b) by at least one boundary line (804),the display area - selection circuit a display surface (500, 503), comprising at least a portion of at least one boundary line of the modulation surface, whereby the selected display area divided two display surfaces, which are provided in two divided modulation surfaces, disposed on each side of the boundary line, wherein each divided display area a corresponding display start position and a corresponding display end position contains,..
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