| 摘要 |
<p>A method of making a substantially panchromatic holographic optic element (HOE) is disclosed, comprising depositing a layer of finely granulated silver halide in emulsion or suspension onto a polymeric, plastics or film layer to a depth of less than lOOµm or preferably lOOµm and then exposing to laser light of at least 3 different wavelengths in the visible light spectrum either consecutively or simultaneously and then curing the resulting holographic image recorded in said silver halide layer. The invention also covers a display screen capable of receiving an image signal and interpreting said signal to display said image represented thereby on an image projecting surface of said display screen, said display screen (2) comprising an electronically controlled light transmissive panel (4) , the electronic control of which results in differential illumination of portions of said panel, and at least one reflector (6) disposed adjacent and behind said panel such that light impinging on the surface of said panel can pass through the panel and be reflected to a certain extent by said reflector which is made by the aforementioned method. This renders said substrate and said panel together substantially panchromatically holographically reflective to visible light giving rise to exception brilliance under normal ambient and/or day light.</p> |
