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US 7,777,944 B2Granted
Reflective screens
AssigneeDelta Electronics, Inc.
InventorsFang-Chuan Ho, June-Jei Huang, Kun-Hung Tu
Life of this patent
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Abstract
This invention discloses a projection screen including a diffusion layer, a cap layer, an interference layer and an absorption layer. The projection screen of this invention is based on the concept of inverse reflection. The interference filter includes a plurality of high and low refractive index layers, both of which alternately stacked. The projection screen conveys a small spectral shift and a narrow bandwidth at different incident angles so that the better contract ratio of the image signal can be displayed.
Claims14
A reflective screen comprising
- a cap layer;
- an interference filter formed at one side of the cap layer to reflect light and generate a shift in a spectrum when an incident light is introduced;
- a diffusion layer formed at another side of the cap layer;
- and
- an absorption layer formed at one side of the interference filter,
- wherein the interference filter comprises alternate layers of a plurality of high refractive index layers and a plurality of low refractive index layers, both of which are alternately stacked, and the high refractive index layers comprise ZrO2 and the low refractive index layers comprise Al2O3,
- wherein the low refractive index layers are doped with Y2O3.
4 more elements
Dependencies are inferred from the claim text.