Prism Grating Microstructure for LED Light Concentration

The patent replaces the mechanical transparent mask with a prism grating microstructure that uses optical refraction and reflection principles to concentrate light. The prism grating structure guides light rays through controlled refraction at multiple interfaces, achieving light concentration without the speckle interference caused by mechanical masks. This substitution of mechanical filtering with optical geometric guidance resolves the contradiction between light concentration and speckle generation.

The patent extracts and concentrates light rays that would otherwise be dispersed in specific directions toward the target area. By using the prism grating microstructure to redirect and concentrate light rays, the system maximizes the utilization of existing light output, directing energy more efficiently to the intended target rather than allowing uniform dispersion. This extraction and concentration of light rays achieves enhanced illumination intensity at the target without requiring increased power input.

The patent applies local quality by creating a specialized prism grating microstructure in the light cover that is specifically designed to concentrate light toward a particular target area. Rather than uniformly distributing light across the entire cover, the microstructure creates localized regions with different optical properties - the prism grating areas that redirect light to the target versus the surrounding areas that maintain normal light transmission. This localized optical modification enables concentrated illumination on the target area while preserving overall coverage.