| 摘要 |
PCT No. PCT/AU94/00279 Sec. 371 Date Feb. 26, 1996 Sec. 102(e) Date Feb. 26, 1996 PCT Filed May 25, 1994 PCT Pub. No. WO94/28444 PCT Pub. Date Dec. 8, 1994A pixellated diffractive device includes a multiplicity of pixels in turn divided into multiple sub-pixels. The device is related to one or more pixellated diffraction surface structures which when illuminated generate respective corresponding optically variable images. The sub-pixels of each pixel of the diffractive device include diffractive elements arranged in one or more groups, the diffractive elements of each group matching diffractive elements of a corresponding single pixel of the respective pixellated diffraction surface structures. In each pixel of the device the diffractive elements of the or each said group are intermixed with other subpixels and cooperatively contribute a single element of the corresponding optically variable image which is generated on illumination of the diffractive device. |
