Patent ID: 8314819

Claim:
An apparatus, comprising: a first substrate; a second substrate; and a modulation layer between said first and second substrates, wherein light modulation in predetermined areas of said modulation layer corresponding to pixels comprising conductive electrodes and located on the first or the second substrate is provided by applying electric signals corresponding to data of an image to said pixels for providing electric fields between said pixels located on the first or the second substrate and an electrically conducting layer of the opposite second or first substrate, wherein said first substrate comprises a waveguide configured to guide lights of different colors and further comprises a first optical layer configured to provide diffractive out-coupling of light of at least a first color to pre-selected pixels or subpixels of said pixels, and a second optical layer, stacked on the first optical layer, configured to provide diffractive out-coupling of light of at least a second color to pre-selected pixels or subpixels of said pixels, wherein said second substrate is configured to provide further out-coupling of lights of different colors after the light being modulated by said electric fields corresponding to said data of said image for providing said image.