| 摘要 |
An optical modulator comprising a light source and a device for turning on/o ff the output light from the light source in which the number of gradations of light outputted from the device can be increased without increasing the frequency of a clock signal serving as the unit in the on/off control of the output light from the light source. A light intensity modulation circuit (11 ) generates an intensity modulation signal from a luminance signal YS and a synchronizing signal and delivers it to a power supply (12), so that a light source (13) outputs light subjected to intensity modulation according to the luminance signal. A pulse width modulation circuit (14) generates a pulse width modulation signal from the luminance signal YS, the synchronizing sign al and the clock signal and delivers it to a light valve (15), which outputs light subjected to pulse width modulation according to the luminance signal.
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