LED Package Structure for Lateral Light Diffusion in Thin Backlights

The patent embeds the light transmissive member directly within the resin package structure, nesting it between the light emitting element and the external environment. This integration allows the light diffusion function to be achieved without adding external thickness, as the member is incorporated into the existing package volume rather than being added as a separate layer.

The patent utilizes the lateral dimension within the resin package to achieve light diffusion. By positioning the light transmissive member to refract and diffuse light in the lateral direction rather than requiring additional vertical thickness, the solution transforms the problem from a vertical thickness issue to a lateral light path management issue, effectively using another dimension to resolve the contradiction.

The patent extracts the light diffusion function from the light sources themselves and assigns it to a dedicated light transmissive member. Instead of relying on multiple light sources to achieve uniformity, the solution separates the illumination function (performed by single or few light sources) from the light distribution function (performed by the refractive light transmissive member), thereby reducing the number of light sources needed and decreasing device weight.

The light transmissive member acts as an intermediary between the light sources and the final light output. It receives light from the light emitting element and actively manages its distribution through refraction and diffusion, creating uniform lateral light emission. This intermediary structure allows a single light source to achieve uniformity that would otherwise require multiple sources, reducing overall device weight.

The resin package structure serves multiple functions simultaneously: it provides mechanical support for the light emitting element, acts as a protective enclosure, and incorporates the light transmissive member to manage light diffusion. This multi-functionality eliminates the need for separate dedicated components for each function, achieving lateral light diffusion without proportionally increasing device complexity.

The patent merges the light diffusion function with the existing resin package structure by integrating the light transmissive member into the package. Rather than adding a separate complex diffusion mechanism, the solution combines the structural package with the optical diffusion function, achieving lateral light exit while minimizing additional structural complexity.