| 摘要 |
Various techniques are disclosed for forming light diffusing or projection screens, comprising printing a transparent substrate. In preferred techniques, resin forming microlenses (12) are deposited on one side of a transparent substrate (10) and an opaque material (14) is deposited on the opposite side so as to cover the areas between lenses (12). In one technique, the substrate is printed with a pattern corresponding to the desired locations of the lenses, in a material wettable by a polymerisable monomer, whilst the substrate is non-wettable by the monomer, or the interstices between desired lens locations are printed in a non-wettable material (the substrate being wettable) and the substrate so printed is coated with the fluid monomer, which adheres preferentially to the wettable regions to form droplets or beads which are subsequently cured to form microlenses. In another technique, (Figure 6), successive layers of fusible transparent toner are deposited on the substrate electrographically. In yet another technique, transparent droplets are "printed" on the substrate (12) by means similar to an "ink-jet" printer. |
