Patent ID: 7190417

Claim:
An optical address type spatial light modulator comprising a plurality of optical address type light modulation layers stacked on each other, wherein each of optical address type light modulation layers comprises: a liquid crystal layer for reflecting visible light in a specific wavelength band; a photoconductive layer for absorbing the visible light substantially only in the specific wavelength band to change a resistance value thereof in response to the light intensity of the visible light absorbed; a first electrode disposed on the liquid crystal layer; and a second electrode disposed on the photoconductive layer, wherein each of liquid crystal layers and each of photoconductive layers are stacked on each other; wherein the specific wavelength bands of the respective liquid crystal layers are substantially different from, each other; wherein each of the optical address type light modulation layers further comprises a light absorption layer stacked between the liquid crystal layer and the photoconductive layer; wherein in each optical address type light modulation layer, the light absorption layer absorbs the visible light in a specific wavelength band substantially identical with the specific wavelength band of the liquid crystal layer; and wherein the light absorption layers transmit visible light in wavelength bands except the specific wavelength bands.