Projector

Abstract

A projector includes a light source unit that supplies light, and a spatial light modulator that modulates light supplied from the light source unit according to an image signal. The spatial light modulator is driven by an applied voltage whose polarity is reversed according to a polarity-reversing frequency which is specific to the spatial light modulator. The light source unit supplies light which is modulated according to pulse width modulation for which fundamental frequency is set based on the polarity-reversing frequency.

What is claimed is: 
     
         1 . A projector comprising:
 a light source unit that supplies light; and   a spatial light modulator that modulates light supplied from the light source unit according to an image signal,   wherein the spatial light modulator is driven by an applied voltage whose polarity is reversed according to a polarity-reversing frequency which is specific to the spatial light modulator, and   the light source unit supplies light which is modulated according to pulse width modulation for which fundamental frequency is set based on the polarity-reversing frequency.   
     
     
         2 . The projector according to  claim 1 , wherein
 at least one of (A) the fundamental frequency is an even multiple of the polarity-reversing frequency, and (B) a phase of the pulse width modulation is reversed every polarity-reversing period according to the polarity-reversing frequency, is satisfied.   
     
     
         3 . The projector according to  claim 2 , wherein
 the phase of the pulse width modulation is reversed every time one writing of the image signal is performed for an entire screen.   
     
     
         4 . The projector according to  claim 1 , wherein
 the light source unit supplies light according to a smoothed signal which is obtained by smoothing a pulse width modulation signal.   
     
     
         5 . The projector according to  claim 1 , wherein
 there are plural light source units, and   the light source units are controlled according to difference in outputs of the light source units.   
     
     
         6 . The projector according to  claim 1 , wherein
 the light source unit includes a solid-state light source.   
     
     
         7 . The projector according to  claim 1 , wherein
 the spatial light modulator includes a liquid crystal display.